diff --git a/CHANGE.md b/CHANGE.md
index 8316f902..b5fd93a3 100644
--- a/CHANGE.md
+++ b/CHANGE.md
@@ -357,4 +357,8 @@
 
   + 将微信支付模块移到base工程
   
-  + **weixin4j-qy**: 管理成员新增头像参数
\ No newline at end of file
+  + **weixin4j-qy**: 管理成员新增头像参数
+  
+* 2015-06-27
+
+  + 媒体接口(MediaApi)中上传方法中的File类型调整为InputStream
\ No newline at end of file
diff --git a/weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/ContentType.java b/weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/ContentType.java
index 43f8d8be..1e1355ee 100644
--- a/weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/ContentType.java
+++ b/weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/ContentType.java
@@ -40,6 +40,12 @@ public final class ContentType implements Serializable {
 			Consts.UTF_8);
 	public static final ContentType TEXT_PLAIN = create("text/plain",
 			Consts.UTF_8);
+	public static final ContentType IMAGE_JPG = create("image/jpg",
+			Consts.UTF_8);
+	public static final ContentType AUDIO_MP3 = create("audio/mp3",
+			Consts.UTF_8);
+	public static final ContentType VIDEO_MPEG4 = create("video/mpeg4",
+			Consts.UTF_8);
 	public static final ContentType TEXT_XML = create("text/xml", Consts.UTF_8);
 	public static final ContentType WILDCARD = create("*/*", (Charset) null);
 
diff --git a/weixin4j-base/src/main/java/com/foxinmy/weixin4j/type/MediaType.java b/weixin4j-base/src/main/java/com/foxinmy/weixin4j/type/MediaType.java
index daca3d44..3c927496 100644
--- a/weixin4j-base/src/main/java/com/foxinmy/weixin4j/type/MediaType.java
+++ b/weixin4j-base/src/main/java/com/foxinmy/weixin4j/type/MediaType.java
@@ -1,5 +1,7 @@
 package com.foxinmy.weixin4j.type;
 
+import com.foxinmy.weixin4j.http.ContentType;
+
 /**
  * 上传的媒体类型</br>
  * <p>
@@ -21,28 +23,18 @@ package com.foxinmy.weixin4j.type;
  * @since JDK 1.7
  */
 public enum MediaType {
-	image("jpg"), voice("amr/mp3"), video("mp4"), thumb("jpg"), file("unknown"), news(
-			"");
+	image(ContentType.IMAGE_JPG), voice(ContentType.AUDIO_MP3), video(
+			ContentType.VIDEO_MPEG4), thumb(ContentType.IMAGE_JPG), file(
+			ContentType.APPLICATION_OCTET_STREAM), news(
+			ContentType.APPLICATION_OCTET_STREAM);
 
-	MediaType(String formatName) {
-		this.formatName = formatName;
+	MediaType(ContentType contentType) {
+		this.contentType = contentType;
 	}
 
-	public static MediaType getMediaType(String key) {
-		if (key.equals("jpg")) {
-			return MediaType.image;
-		} else if ("amr/mp3".contains(key)) {
-			return MediaType.voice;
-		} else if (key.equals("mp4")) {
-			return MediaType.video;
-		} else {
-			return MediaType.file;
-		}
-	}
+	private ContentType contentType;
 
-	private String formatName;
-
-	public String getFormatName() {
-		return formatName;
+	public ContentType getContentType() {
+		return contentType;
 	}
 }
diff --git a/weixin4j-base/src/main/java/com/foxinmy/weixin4j/util/ObjectId.java b/weixin4j-base/src/main/java/com/foxinmy/weixin4j/util/ObjectId.java
new file mode 100644
index 00000000..ccdd95b4
--- /dev/null
+++ b/weixin4j-base/src/main/java/com/foxinmy/weixin4j/util/ObjectId.java
@@ -0,0 +1,333 @@
+package com.foxinmy.weixin4j.util;
+
+/*
+ * Copyright (c) 2008-2014 MongoDB, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import java.net.NetworkInterface;
+import java.nio.ByteBuffer;
+import java.util.Date;
+import java.util.Enumeration;
+import java.util.Random;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+/**
+ * <p>
+ * A globally unique identifier for objects.
+ * </p>
+ * 
+ * <p>
+ * Consists of 12 bytes, divided as follows:
+ * </p>
+ * <table border="1">
+ * <caption>ObjectID layout</caption>
+ * <tr>
+ * <td>0</td>
+ * <td>1</td>
+ * <td>2</td>
+ * <td>3</td>
+ * <td>4</td>
+ * <td>5</td>
+ * <td>6</td>
+ * <td>7</td>
+ * <td>8</td>
+ * <td>9</td>
+ * <td>10</td>
+ * <td>11</td>
+ * </tr>
+ * <tr>
+ * <td colspan="4">time</td>
+ * <td colspan="3">machine</td>
+ * <td colspan="2">pid</td>
+ * <td colspan="3">inc</td>
+ * </tr>
+ * </table>
+ * 
+ * <p>
+ * Instances of this class are immutable.
+ * </p>
+ * 
+ * @mongodb.driver.manual core/object-id ObjectId
+ */
+public class ObjectId implements Comparable<ObjectId>, java.io.Serializable {
+
+	private static final long serialVersionUID = -4415279469780082174L;
+
+	static final Logger LOGGER = Logger.getLogger("org.bson.ObjectId");
+
+	/**
+	 * Gets a new object id.
+	 * 
+	 * @return the new id
+	 */
+	public static ObjectId get() {
+		return new ObjectId();
+	}
+
+	/**
+	 * Checks if a string could be an {@code ObjectId}.
+	 * 
+	 * @param s
+	 *            a potential ObjectId as a String.
+	 * @return whether the string could be an object id
+	 * @throws IllegalArgumentException
+	 *             if hexString is null
+	 */
+	public static boolean isValid(String s) {
+		if (s == null)
+			return false;
+
+		final int len = s.length();
+		if (len != 24)
+			return false;
+
+		for (int i = 0; i < len; i++) {
+			char c = s.charAt(i);
+			if (c >= '0' && c <= '9')
+				continue;
+			if (c >= 'a' && c <= 'f')
+				continue;
+			if (c >= 'A' && c <= 'F')
+				continue;
+
+			return false;
+		}
+
+		return true;
+	}
+
+	/**
+	 * Constructs an ObjectId given its 12-byte binary representation.
+	 * 
+	 * @param b
+	 *            a byte array of length 12
+	 */
+	public ObjectId(byte[] b) {
+		if (b.length != 12)
+			throw new IllegalArgumentException("need 12 bytes");
+		ByteBuffer bb = ByteBuffer.wrap(b);
+		_time = bb.getInt();
+		_machine = bb.getInt();
+		_inc = bb.getInt();
+		_new = false;
+	}
+
+	/**
+	 * Create a new object id.
+	 */
+	public ObjectId() {
+		_time = (int) (System.currentTimeMillis() / 1000);
+		_machine = _genmachine;
+		_inc = _nextInc.getAndIncrement();
+		_new = true;
+	}
+
+	@Override
+	public int hashCode() {
+		int x = _time;
+		x += (_machine * 111);
+		x += (_inc * 17);
+		return x;
+	}
+
+	@Override
+	public boolean equals(Object o) {
+		if (this == o)
+			return true;
+
+		ObjectId other = (ObjectId) o;
+		if (other == null)
+			return false;
+
+		return _time == other._time && _machine == other._machine
+				&& _inc == other._inc;
+	}
+
+	/**
+	 * Converts this instance into a 24-byte hexadecimal string representation.
+	 * 
+	 * @return a string representation of the ObjectId in hexadecimal format
+	 */
+	public String toHexString() {
+		final StringBuilder buf = new StringBuilder(24);
+
+		for (final byte b : toByteArray()) {
+			buf.append(String.format("%02x", b & 0xff));
+		}
+
+		return buf.toString();
+	}
+
+	/**
+	 * Convert to a byte array. Note that the numbers are stored in big-endian
+	 * order.
+	 * 
+	 * @return the byte array
+	 */
+	public byte[] toByteArray() {
+		byte b[] = new byte[12];
+		ByteBuffer bb = ByteBuffer.wrap(b);
+		// by default BB is big endian like we need
+		bb.putInt(_time);
+		bb.putInt(_machine);
+		bb.putInt(_inc);
+		return b;
+	}
+
+	static String _pos(String s, int p) {
+		return s.substring(p * 2, (p * 2) + 2);
+	}
+
+	public String toString() {
+		byte b[] = toByteArray();
+
+		StringBuilder buf = new StringBuilder(24);
+
+		for (int i = 0; i < b.length; i++) {
+			int x = b[i] & 0xFF;
+			String s = Integer.toHexString(x);
+			if (s.length() == 1)
+				buf.append("0");
+			buf.append(s);
+		}
+
+		return buf.toString();
+	}
+
+	int _compareUnsigned(int i, int j) {
+		long li = 0xFFFFFFFFL;
+		li = i & li;
+		long lj = 0xFFFFFFFFL;
+		lj = j & lj;
+		long diff = li - lj;
+		if (diff < Integer.MIN_VALUE)
+			return Integer.MIN_VALUE;
+		if (diff > Integer.MAX_VALUE)
+			return Integer.MAX_VALUE;
+		return (int) diff;
+	}
+
+	public int compareTo(ObjectId id) {
+		if (id == null)
+			return -1;
+
+		int x = _compareUnsigned(_time, id._time);
+		if (x != 0)
+			return x;
+
+		x = _compareUnsigned(_machine, id._machine);
+		if (x != 0)
+			return x;
+
+		return _compareUnsigned(_inc, id._inc);
+	}
+
+	/**
+	 * Gets the timestamp (number of seconds since the Unix epoch).
+	 * 
+	 * @return the timestamp
+	 */
+	public int getTimestamp() {
+		return _time;
+	}
+
+	/**
+	 * Gets the timestamp as a {@code Date} instance.
+	 * 
+	 * @return the Date
+	 */
+	public Date getDate() {
+		return new Date(_time * 1000L);
+	}
+
+	/**
+	 * Gets the current value of the auto-incrementing counter.
+	 * 
+	 * @return the current counter value.
+	 */
+	public static int getCurrentCounter() {
+		return _nextInc.get();
+	}
+
+	final int _time;
+	final int _machine;
+	final int _inc;
+
+	boolean _new;
+
+	private static AtomicInteger _nextInc = new AtomicInteger(
+			(new java.util.Random()).nextInt());
+
+	private static final int _genmachine;
+	static {
+
+		try {
+			// build a 2-byte machine piece based on NICs info
+			int machinePiece;
+			{
+				try {
+					StringBuilder sb = new StringBuilder();
+					Enumeration<NetworkInterface> e = NetworkInterface
+							.getNetworkInterfaces();
+					while (e.hasMoreElements()) {
+						NetworkInterface ni = e.nextElement();
+						sb.append(ni.toString());
+					}
+					machinePiece = sb.toString().hashCode() << 16;
+				} catch (Throwable e) {
+					// exception sometimes happens with IBM JVM, use random
+					LOGGER.log(Level.WARNING, e.getMessage(), e);
+					machinePiece = (new Random().nextInt()) << 16;
+				}
+				LOGGER.fine("machine piece post: "
+						+ Integer.toHexString(machinePiece));
+			}
+
+			// add a 2 byte process piece. It must represent not only the JVM
+			// but the class loader.
+			// Since static var belong to class loader there could be collisions
+			// otherwise
+			final int processPiece;
+			{
+				int processId = new java.util.Random().nextInt();
+				try {
+					processId = java.lang.management.ManagementFactory
+							.getRuntimeMXBean().getName().hashCode();
+				} catch (Throwable t) {
+				}
+
+				ClassLoader loader = ObjectId.class.getClassLoader();
+				int loaderId = loader != null
+						? System.identityHashCode(loader)
+						: 0;
+
+				StringBuilder sb = new StringBuilder();
+				sb.append(Integer.toHexString(processId));
+				sb.append(Integer.toHexString(loaderId));
+				processPiece = sb.toString().hashCode() & 0xFFFF;
+				LOGGER.fine("process piece: "
+						+ Integer.toHexString(processPiece));
+			}
+
+			_genmachine = machinePiece | processPiece;
+			LOGGER.fine("machine : " + Integer.toHexString(_genmachine));
+		} catch (Exception e) {
+			throw new RuntimeException(e);
+		}
+
+	}
+}
diff --git a/weixin4j-mp/src/main/java/com/foxinmy/weixin4j/mp/WeixinProxy.java b/weixin4j-mp/src/main/java/com/foxinmy/weixin4j/mp/WeixinProxy.java
index a890ab39..1d05bfb5 100644
--- a/weixin4j-mp/src/main/java/com/foxinmy/weixin4j/mp/WeixinProxy.java
+++ b/weixin4j-mp/src/main/java/com/foxinmy/weixin4j/mp/WeixinProxy.java
@@ -2,6 +2,7 @@ package com.foxinmy.weixin4j.mp;
 
 import java.io.File;
 import java.io.IOException;
+import java.io.InputStream;
 import java.util.Date;
 import java.util.List;
 
@@ -132,7 +133,8 @@ public class WeixinProxy {
 	 * @param isMaterial
 	 *            是否永久上传
 	 * @return 上传到微信服务器返回的媒体标识
-	 * @see {@link com.foxinmy.weixin4j.mp.WeixinProxy#uploadMedia(File, MediaType)}
+	 * @see {@link com.foxinmy.weixin4j.mp.WeixinProxy#uploadMedia(InputStream, MediaType,boolean)}
+	 * @see com.foxinmy.weixin4j.mp.api.MediaApi
 	 * @throws WeixinException
 	 * @throws IOException
 	 */
@@ -142,49 +144,30 @@ public class WeixinProxy {
 	}
 
 	/**
-	 * 上传媒体文件
-	 * 
-	 * @param file
-	 *            文件对象
-	 * @param mediaType
-	 *            媒体类型
-	 * @param isMaterial
-	 *            是否永久上传
-	 * @return 上传到微信服务器返回的媒体标识
-	 * @throws WeixinException
-	 * @throws IOException
-	 * @see com.foxinmy.weixin4j.type.MediaType
-	 * @see {@link com.foxinmy.weixin4j.mp.WeixinProxy#uploadMedia(String, byte[],String)}
-	 */
-	public String uploadMedia(File file, MediaType mediaType, boolean isMaterial)
-			throws WeixinException, IOException {
-		return mediaApi.uploadMedia(file, mediaType, isMaterial);
-	}
-
-	/**
-	 * 上传媒体文件
+	 * 上传媒体文件 </br> <font color="red">此接口只包含图片、语音、缩略图、视频(临时)四种媒体类型的上传</font>
 	 * <p>
 	 * 正常情况下返回{"type":"TYPE","media_id":"MEDIA_ID","created_at":123456789},
 	 * 否则抛出异常.
 	 * </p>
 	 * 
-	 * @param fileName
-	 *            文件名
-	 * @param data
-	 *            媒体数据包
+	 * @param is
+	 *            媒体数据流
 	 * @param mediaType
-	 *            媒体类型
+	 *            媒体文件类型：分别有图片（image）、语音（voice）、视频(video)和缩略图（thumb）
 	 * @param isMaterial
 	 *            是否永久上传
 	 * @return 上传到微信服务器返回的媒体标识
 	 * @see <a
-	 *      href="http://mp.weixin.qq.com/wiki/10/78b15308b053286e2a66b33f0f0f5fb6.html">上传下载说明</a>
+	 *      href="http://mp.weixin.qq.com/wiki/5/963fc70b80dc75483a271298a76a8d59.html">上传临时素材</a>
+	 * @see <a
+	 *      href="http://mp.weixin.qq.com/wiki/14/7e6c03263063f4813141c3e17dd4350a.html">上传永久素材</a>
+	 * @see com.foxinmy.weixin4j.type.MediaType
 	 * @see com.foxinmy.weixin4j.mp.api.MediaApi
 	 * @throws WeixinException
 	 */
-	public String uploadMedia(String fileName, byte[] data, String mediaType,
+	public String uploadMedia(InputStream is, MediaType mediaType,
 			boolean isMaterial) throws WeixinException {
-		return mediaApi.uploadMedia(fileName, data, mediaType, isMaterial);
+		return mediaApi.uploadMedia(is, mediaType, isMaterial);
 	}
 
 	/**
@@ -203,13 +186,12 @@ public class WeixinProxy {
 	 * @throws WeixinException
 	 * @see <a
 	 *      href="http://mp.weixin.qq.com/wiki/10/78b15308b053286e2a66b33f0f0f5fb6.html">上传下载说明</a>
-	 * @see com.foxinmy.weixin4j.type.MediaType
 	 * @see com.foxinmy.weixin4j.mp.api.MediaApi
 	 * @see {@link com.foxinmy.weixin4j.mp.WeixinProxy#downloadMedia(String)}
 	 */
-	public File downloadMedia(String mediaId, MediaType mediaType,
-			boolean isMaterial) throws WeixinException {
-		return mediaApi.downloadMedia(mediaId, mediaType, isMaterial);
+	public File downloadMediaFile(String mediaId, boolean isMaterial)
+			throws WeixinException {
+		return mediaApi.downloadMediaFile(mediaId, isMaterial);
 	}
 
 	/**
diff --git a/weixin4j-mp/src/main/java/com/foxinmy/weixin4j/mp/api/MediaApi.java b/weixin4j-mp/src/main/java/com/foxinmy/weixin4j/mp/api/MediaApi.java
index fa366615..218ca1e8 100644
--- a/weixin4j-mp/src/main/java/com/foxinmy/weixin4j/mp/api/MediaApi.java
+++ b/weixin4j-mp/src/main/java/com/foxinmy/weixin4j/mp/api/MediaApi.java
@@ -4,6 +4,7 @@ import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.IOException;
+import java.io.InputStream;
 import java.io.OutputStream;
 import java.io.UnsupportedEncodingException;
 import java.util.ArrayList;
@@ -16,6 +17,7 @@ import com.alibaba.fastjson.parser.deserializer.ExtraProcessor;
 import com.foxinmy.weixin4j.exception.WeixinException;
 import com.foxinmy.weixin4j.http.apache.ByteArrayBody;
 import com.foxinmy.weixin4j.http.apache.FormBodyPart;
+import com.foxinmy.weixin4j.http.apache.InputStreamBody;
 import com.foxinmy.weixin4j.http.apache.StringBody;
 import com.foxinmy.weixin4j.http.weixin.JsonResult;
 import com.foxinmy.weixin4j.http.weixin.WeixinResponse;
@@ -30,6 +32,7 @@ import com.foxinmy.weixin4j.type.MediaType;
 import com.foxinmy.weixin4j.util.ConfigUtil;
 import com.foxinmy.weixin4j.util.FileUtil;
 import com.foxinmy.weixin4j.util.IOUtil;
+import com.foxinmy.weixin4j.util.ObjectId;
 import com.foxinmy.weixin4j.util.StringUtil;
 
 /**
@@ -57,7 +60,7 @@ public class MediaApi extends MpApi {
 	 * @param isMaterial
 	 *            是否永久上传
 	 * @return 上传到微信服务器返回的媒体标识
-	 * @see {@link com.foxinmy.weixin4j.mp.api.MediaApi#uploadMedia(File, MediaType)}
+	 * @see {@link com.foxinmy.weixin4j.mp.api.MediaApi#uploadMedia(InputStream, MediaType,boolean)}
 	 * @throws WeixinException
 	 * @throws IOException
 	 */
@@ -67,28 +70,17 @@ public class MediaApi extends MpApi {
 		if (StringUtil.isBlank(mediaTypeKey)) {
 			mediaTypeKey = FileUtil.getFileType(file);
 		}
-		MediaType mediaType = MediaType.getMediaType(mediaTypeKey);
-		return uploadMedia(file, mediaType, isMaterial);
-	}
-
-	/**
-	 * 上传媒体文件</br> <font color="red">此接口只包含图片、语音、缩略图三种媒体类型的上传</font>
-	 * 
-	 * @param file
-	 *            文件对象
-	 * @param mediaType
-	 *            媒体类型 （image）、语音（voice）和缩略图（thumb）
-	 * @param isMaterial
-	 *            是否永久上传
-	 * @return 上传到微信服务器返回的媒体标识
-	 * @throws WeixinException
-	 * @see com.foxinmy.weixin4j.type.MediaType
-	 * @see {@link com.foxinmy.weixin4j.mp.api.MediaApi#uploadMedia(String, byte[],String,boolean)}
-	 */
-	public String uploadMedia(File file, MediaType mediaType, boolean isMaterial)
-			throws WeixinException, IOException {
-		byte[] datas = IOUtil.toByteArray(new FileInputStream(file));
-		return uploadMedia(file.getName(), datas, mediaType.name(), isMaterial);
+		MediaType mediaType = null;
+		if ("bmp/png/jpeg/jpg/gif".contains(mediaTypeKey)) {
+			mediaType = MediaType.image;
+		} else if ("amr/mp3".contains(mediaTypeKey)) {
+			mediaType = MediaType.voice;
+		} else if ("mp3/wma/wav/amr".equals(mediaTypeKey)) {
+			mediaType = MediaType.video;
+		} else {
+			throw new WeixinException("unknown mediaType:" + mediaTypeKey);
+		}
+		return uploadMedia(new FileInputStream(file), mediaType, isMaterial);
 	}
 
 	/**
@@ -98,10 +90,8 @@ public class MediaApi extends MpApi {
 	 * 否则抛出异常.
 	 * </p>
 	 * 
-	 * @param fileName
-	 *            文件名
-	 * @param bytes
-	 *            媒体数据包
+	 * @param is
+	 *            媒体数据流
 	 * @param mediaType
 	 *            媒体文件类型：分别有图片（image）、语音（voice）、视频(video)和缩略图（thumb）
 	 * @param isMaterial
@@ -111,37 +101,45 @@ public class MediaApi extends MpApi {
 	 *      href="http://mp.weixin.qq.com/wiki/5/963fc70b80dc75483a271298a76a8d59.html">上传临时素材</a>
 	 * @see <a
 	 *      href="http://mp.weixin.qq.com/wiki/14/7e6c03263063f4813141c3e17dd4350a.html">上传永久素材</a>
+	 * @see com.foxinmy.weixin4j.type.MediaType
+	 * @see com.foxinmy.weixin4j.mp.api.MediaApi
 	 * @throws WeixinException
 	 */
-	public String uploadMedia(String fileName, byte[] bytes, String mediaType,
+	public String uploadMedia(InputStream is, MediaType mediaType,
 			boolean isMaterial) throws WeixinException {
-		if (",image,voice,video,thumb,".indexOf(String
-				.format(",%s,", mediaType)) < 0) {
-			throw new WeixinException(String.format(
-					"unsupported media type:%s", mediaType));
-		}
 		if (mediaType.equals(MediaType.video.name()) && isMaterial) {
 			throw new WeixinException(
 					"please invoke uploadMaterialVideo method");
 		}
 		Token token = tokenHolder.getToken();
 		WeixinResponse response = null;
-		if (isMaterial) {
-			String material_media_upload_uri = getRequestUri("material_media_upload_uri");
-			try {
-				response = weixinClient.post(String.format(
-						material_media_upload_uri, token.getAccessToken()),
-						new FormBodyPart("media", new ByteArrayBody(bytes,
-								fileName)), new FormBodyPart("type",
-								new StringBody(mediaType, Consts.UTF_8)));
-			} catch (UnsupportedEncodingException e) {
-				throw new WeixinException(e); // ignore
+		try {
+			if (isMaterial) {
+				String material_media_upload_uri = getRequestUri("material_media_upload_uri");
+				response = weixinClient.post(
+						String.format(material_media_upload_uri,
+								token.getAccessToken()),
+						new FormBodyPart("media", new InputStreamBody(is,
+								mediaType.getContentType().getMimeType(),
+								ObjectId.get().toHexString())),
+						new FormBodyPart("type", new StringBody(mediaType
+								.name(), Consts.UTF_8)));
+			} else {
+				String file_upload_uri = getRequestUri("file_upload_uri");
+				response = weixinClient.post(String.format(file_upload_uri,
+						token.getAccessToken(), mediaType), new FormBodyPart(
+						"media", new InputStreamBody(is, mediaType
+								.getContentType().getMimeType(), ObjectId.get()
+								.toHexString())));
+			}
+		} catch (UnsupportedEncodingException e) {
+			; // ignore
+		} finally {
+			try {
+				is.close();
+			} catch (IOException e) {
+				;
 			}
-		} else {
-			String file_upload_uri = getRequestUri("file_upload_uri");
-			response = weixinClient.post(String.format(file_upload_uri,
-					token.getAccessToken(), mediaType), new FormBodyPart(
-					"media", new ByteArrayBody(bytes, fileName)));
 		}
 		return response.getAsJson().getString("media_id");
 	}
@@ -154,27 +152,18 @@ public class MediaApi extends MpApi {
 	 * 
 	 * @param mediaId
 	 *            存储在微信服务器上的媒体标识
-	 * @param mediaType
-	 *            媒体文件类型：分别有图片（image）、语音（voice）、视频（video）和缩略图（thumb）
-	 * @return 写入硬盘后的文件对象
+	 * @return 写入硬盘后的文件对象,存储路径见weixin4j.properties配置
 	 * @throws WeixinException
 	 * @see <a
 	 *      href="http://mp.weixin.qq.com/wiki/11/07b6b76a6b6e8848e855a435d5e34a5f.html">下载临时媒体文件</a>
 	 * @see <a
 	 *      href="http://mp.weixin.qq.com/wiki/4/b3546879f07623cb30df9ca0e420a5d0.html">下载永久媒体素材</a>
-	 * @see com.foxinmy.weixin4j.type.MediaType
 	 * @see {@link com.foxinmy.weixin4j.mp.api.MediaApi#downloadMedia(String,boolean)}
 	 */
-	public File downloadMedia(String mediaId, MediaType mediaType,
-			boolean isMaterial) throws WeixinException {
-		if (",image,voice,video,thumb,".indexOf(String.format(",%s,",
-				mediaType.name())) < 0) {
-			throw new WeixinException(String.format(
-					"unsupported media type:%s", mediaType.name()));
-		}
+	public File downloadMediaFile(String mediaId, boolean isMaterial)
+			throws WeixinException {
 		String media_path = ConfigUtil.getValue("media_path");
-		File file = new File(media_path + File.separator + mediaId + "."
-				+ mediaType.getFormatName());
+		File file = new File(media_path + File.separator + mediaId);
 		if (file.exists()) {
 			return file;
 		}
@@ -195,7 +184,7 @@ public class MediaApi extends MpApi {
 				if (os != null) {
 					os.close();
 				}
-			} catch (IOException ignore) {
+			} catch (IOException e) {
 				;
 			}
 		}
diff --git a/weixin4j-mp/src/test/java/com/foxinmy/weixin4j/mp/test/MassTest.java b/weixin4j-mp/src/test/java/com/foxinmy/weixin4j/mp/test/MassTest.java
index 80c84b8f..ca115f97 100644
--- a/weixin4j-mp/src/test/java/com/foxinmy/weixin4j/mp/test/MassTest.java
+++ b/weixin4j-mp/src/test/java/com/foxinmy/weixin4j/mp/test/MassTest.java
@@ -17,7 +17,6 @@ import com.foxinmy.weixin4j.tuple.Image;
 import com.foxinmy.weixin4j.tuple.MpArticle;
 import com.foxinmy.weixin4j.tuple.Text;
 import com.foxinmy.weixin4j.tuple.Video;
-import com.foxinmy.weixin4j.type.MediaType;
 
 /**
  * 群发消息
@@ -42,7 +41,7 @@ public class MassTest extends TokenTest {
 	public void uploadArticle() throws IOException, WeixinException {
 		List<MpArticle> articles = new ArrayList<MpArticle>();
 		String thumbMediaId = mediaApi.uploadMedia(new File("/tmp/test.jpg"),
-				MediaType.image, false);
+				false);
 		articles.add(new MpArticle(thumbMediaId, "title", "content"));
 		massApi.uploadArticle(articles);
 	}
@@ -71,7 +70,7 @@ public class MassTest extends TokenTest {
 	public void massArticleByGroup() throws IOException, WeixinException {
 		List<MpArticle> articles = new ArrayList<MpArticle>();
 		String thumbMediaId = mediaApi.uploadMedia(new File("/tmp/test.jpg"),
-				MediaType.image, false);
+				false);
 		articles.add(new MpArticle(thumbMediaId, "title", "content"));
 		String massId = massApi.massArticleByGroupId(articles, 0);
 		Assert.assertTrue(massId != null);
@@ -81,7 +80,7 @@ public class MassTest extends TokenTest {
 	public void massArticleByOpenIds() throws IOException, WeixinException {
 		List<MpArticle> articles = new ArrayList<MpArticle>();
 		String thumbMediaId = mediaApi.uploadMedia(new File("/tmp/test.jpg"),
-				MediaType.image, false);
+				false);
 		articles.add(new MpArticle(thumbMediaId, "title", "content"));
 		String massId = massApi.massArticleByOpenIds(articles,
 				"owGBft_vbBbOaQOmpEUE4xDLeRSU");
diff --git a/weixin4j-mp/src/test/java/com/foxinmy/weixin4j/mp/test/MediaTest.java b/weixin4j-mp/src/test/java/com/foxinmy/weixin4j/mp/test/MediaTest.java
index c6cfef76..9c0c09d1 100644
--- a/weixin4j-mp/src/test/java/com/foxinmy/weixin4j/mp/test/MediaTest.java
+++ b/weixin4j-mp/src/test/java/com/foxinmy/weixin4j/mp/test/MediaTest.java
@@ -39,7 +39,7 @@ public class MediaTest extends TokenTest {
 	@Test
 	public void upload1() throws IOException, WeixinException {
 		File file = new File("/Users/jy/Downloads/weixin4j.png");
-		String mediaId = mediaApi.uploadMedia(file, MediaType.image, false);
+		String mediaId = mediaApi.uploadMedia(file, false);
 		// 1Vgd1R5DdznSc3rPxd-sNZ3pLt54cejhJ5ItuNcCgrqoQArNANWy5oxso_r9KNlE
 		Assert.assertNotNull(mediaId);
 		System.err.println(mediaId);
@@ -48,16 +48,16 @@ public class MediaTest extends TokenTest {
 	@Test
 	public void download1() throws WeixinException, IOException {
 		File file = mediaApi
-				.downloadMedia(
+				.downloadMediaFile(
 						"1Vgd1R5DdznSc3rPxd-sNZ3pLt54cejhJ5ItuNcCgrqoQArNANWy5oxso_r9KNlE",
-						MediaType.image, false);
+						false);
 		Assert.assertTrue(file.exists());
 	}
 
 	@Test
 	public void upload2() throws IOException, WeixinException {
 		File file = new File("/Users/jy/Downloads/test.jpg");
-		String mediaId = mediaApi.uploadMedia(file, MediaType.image, true);
+		String mediaId = mediaApi.uploadMedia(file, true);
 		// 8790403529
 		Assert.assertNotNull(mediaId);
 		System.err.println(mediaId);
@@ -85,7 +85,7 @@ public class MediaTest extends TokenTest {
 
 	@Test
 	public void download2() throws WeixinException, IOException {
-		File file = mediaApi.downloadMedia("8790403529", MediaType.image, true);
+		File file = mediaApi.downloadMediaFile("8790403529", true);
 		Assert.assertTrue(file.exists());
 	}
 
@@ -129,10 +129,11 @@ public class MediaTest extends TokenTest {
 				20);
 		System.err.println(mediaRecord);
 	}
-	
+
 	@Test
 	public void listAllMaterialMedia() throws WeixinException {
-		List<MediaItem> mediaList = mediaApi.listAllMaterialMedia(MediaType.image);
+		List<MediaItem> mediaList = mediaApi
+				.listAllMaterialMedia(MediaType.image);
 		System.err.println(mediaList);
 	}
 }
diff --git a/weixin4j-mp/src/test/java/com/foxinmy/weixin4j/mp/test/NotifyTest.java b/weixin4j-mp/src/test/java/com/foxinmy/weixin4j/mp/test/NotifyTest.java
index 7b4d80db..babe6173 100644
--- a/weixin4j-mp/src/test/java/com/foxinmy/weixin4j/mp/test/NotifyTest.java
+++ b/weixin4j-mp/src/test/java/com/foxinmy/weixin4j/mp/test/NotifyTest.java
@@ -18,7 +18,6 @@ import com.foxinmy.weixin4j.tuple.News;
 import com.foxinmy.weixin4j.tuple.Text;
 import com.foxinmy.weixin4j.tuple.Video;
 import com.foxinmy.weixin4j.tuple.Voice;
-import com.foxinmy.weixin4j.type.MediaType;
 
 /**
  * 客服消息测试
@@ -90,8 +89,7 @@ public class NotifyTest extends TokenTest {
 
 	@Test
 	public void send2() throws WeixinException, IOException {
-		String mediaId = mediaApi.uploadMedia(new File("/tmp/test.jpg"),
-				MediaType.image, false);
+		String mediaId = mediaApi.uploadMedia(new File("/tmp/test.jpg"), false);
 		NotifyMessage imageNotify = new NotifyMessage(
 				"owGBft_vbBbOaQOmpEUE4xDLeRSU", new Image(mediaId));
 		JsonResult result = notifyApi.sendNotify(imageNotify);
diff --git a/weixin4j-qy/src/main/java/com/foxinmy/weixin4j/qy/WeixinProxy.java b/weixin4j-qy/src/main/java/com/foxinmy/weixin4j/qy/WeixinProxy.java
index 1a287f4f..b71042c2 100644
--- a/weixin4j-qy/src/main/java/com/foxinmy/weixin4j/qy/WeixinProxy.java
+++ b/weixin4j-qy/src/main/java/com/foxinmy/weixin4j/qy/WeixinProxy.java
@@ -2,6 +2,7 @@ package com.foxinmy.weixin4j.qy;
 
 import java.io.File;
 import java.io.IOException;
+import java.io.InputStream;
 import java.util.List;
 
 import com.alibaba.fastjson.JSONObject;
@@ -207,7 +208,7 @@ public class WeixinProxy {
 	 *            媒体对象
 	 * @return 上传到微信服务器返回的媒体标识
 	 * @see com.foxinmy.weixin4j.qy.api.MediaApi
-	 * @see {@link com.foxinmy.weixin4j.qy.WeixinProxy.MediaApi#uploadMedia(File, MediaType)}
+	 * @see {@link com.foxinmy.weixin4j.qy.WeixinProxy.MediaApi#uploadMedia(InputStream, MediaType)}
 	 * @throws WeixinException
 	 * @throws IOException
 	 */
@@ -215,25 +216,6 @@ public class WeixinProxy {
 		return mediaApi.uploadMedia(file);
 	}
 
-	/**
-	 * 上传媒体文件
-	 * 
-	 * @param file
-	 *            文件对象
-	 * @param mediaType
-	 *            媒体类型
-	 * @return 上传到微信服务器返回的媒体标识
-	 * @throws WeixinException
-	 * @throws IOException
-	 * @see com.foxinmy.weixin4j.qy.api.MediaApi
-	 * @see com.foxinmy.weixin4j.type.MediaType
-	 * @see {@link com.foxinmy.weixin4j.qy.WeixinProxy#uploadMedia(String, byte[],String)}
-	 */
-	public String uploadMedia(File file, MediaType mediaType)
-			throws WeixinException, IOException {
-		return mediaApi.uploadMedia(file, mediaType);
-	}
-
 	/**
 	 * 上传媒体文件(完全公开。所有管理员均可调用，media_id可以共享)
 	 * <p>
@@ -241,19 +223,20 @@ public class WeixinProxy {
 	 * 否则抛出异常.
 	 * </p>
 	 * 
-	 * @param bytes
-	 *            媒体数据包
+	 * @param is
+	 *            媒体数据流
 	 * @param mediaType
 	 *            媒体类型
-	 * @return 上传到微信服务器返回的媒体标识
 	 * @see com.foxinmy.weixin4j.qy.api.MediaApi
+	 * @see com.foxinmy.weixin4j.type.MediaType
+	 * @return 上传到微信服务器返回的媒体标识
 	 * @see <a
 	 *      href="http://qydev.weixin.qq.com/wiki/index.php?title=%E4%B8%8A%E4%BC%A0%E5%AA%92%E4%BD%93%E6%96%87%E4%BB%B6">上传媒体文件说明</a>
 	 * @throws WeixinException
 	 */
-	public String uploadMedia(String fileName, byte[] bytes, String mediaType)
+	public String uploadMedia(InputStream is, MediaType mediaType)
 			throws WeixinException {
-		return mediaApi.uploadMedia(fileName, bytes, mediaType);
+		return mediaApi.uploadMedia(is, mediaType);
 	}
 
 	/**
@@ -279,9 +262,7 @@ public class WeixinProxy {
 	 * 
 	 * @param mediaId
 	 *            存储在微信服务器上的媒体标识
-	 * @param extension
-	 *            媒体后缀名
-	 * @return 写入硬盘后的文件对象
+	 * @return 写入硬盘后的文件对象,存储路径见weixin4j.properties配置
 	 * @throws WeixinException
 	 * @throws IOException
 	 * @see com.foxinmy.weixin4j.qy.api.MediaApi
@@ -290,9 +271,8 @@ public class WeixinProxy {
 	 * @see com.foxinmy.weixin4j.type.MediaType
 	 * @see {@link com.foxinmy.weixin4j.WeixinProxy.MediaApi#downloadMedia(String)}
 	 */
-	public File downloadMedia(String mediaId, String extension)
-			throws WeixinException {
-		return mediaApi.downloadMedia(mediaId, extension);
+	public File downloadMediaFile(String mediaId) throws WeixinException {
+		return mediaApi.downloadMediaFile(mediaId);
 	}
 
 	/**
@@ -406,7 +386,8 @@ public class WeixinProxy {
 	 * @return 处理结果
 	 * @throws WeixinException
 	 */
-	public JsonResult createUser(User user, File avatar) throws WeixinException {
+	public JsonResult createUser(User user, InputStream avatar)
+			throws WeixinException {
 		return userApi.createUser(user, avatar);
 	}
 
@@ -440,7 +421,8 @@ public class WeixinProxy {
 	 * @return 处理结果
 	 * @throws WeixinException
 	 */
-	public JsonResult updateUser(User user, File avatar) throws WeixinException {
+	public JsonResult updateUser(User user, InputStream avatar)
+			throws WeixinException {
 		return userApi.updateUser(user, avatar);
 	}
 
diff --git a/weixin4j-qy/src/main/java/com/foxinmy/weixin4j/qy/api/MediaApi.java b/weixin4j-qy/src/main/java/com/foxinmy/weixin4j/qy/api/MediaApi.java
index 63802602..b3074429 100644
--- a/weixin4j-qy/src/main/java/com/foxinmy/weixin4j/qy/api/MediaApi.java
+++ b/weixin4j-qy/src/main/java/com/foxinmy/weixin4j/qy/api/MediaApi.java
@@ -1,9 +1,11 @@
 package com.foxinmy.weixin4j.qy.api;
 
+import java.io.ByteArrayInputStream;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.IOException;
+import java.io.InputStream;
 import java.io.OutputStream;
 import java.io.StringWriter;
 import java.util.LinkedHashMap;
@@ -15,8 +17,8 @@ import com.alibaba.fastjson.JSONArray;
 import com.alibaba.fastjson.JSONObject;
 import com.alibaba.fastjson.serializer.PropertyFilter;
 import com.foxinmy.weixin4j.exception.WeixinException;
-import com.foxinmy.weixin4j.http.apache.ByteArrayBody;
 import com.foxinmy.weixin4j.http.apache.FormBodyPart;
+import com.foxinmy.weixin4j.http.apache.InputStreamBody;
 import com.foxinmy.weixin4j.http.weixin.WeixinResponse;
 import com.foxinmy.weixin4j.model.Consts;
 import com.foxinmy.weixin4j.model.Token;
@@ -28,6 +30,7 @@ import com.foxinmy.weixin4j.type.MediaType;
 import com.foxinmy.weixin4j.util.ConfigUtil;
 import com.foxinmy.weixin4j.util.FileUtil;
 import com.foxinmy.weixin4j.util.IOUtil;
+import com.foxinmy.weixin4j.util.ObjectId;
 import com.foxinmy.weixin4j.util.StringUtil;
 
 /**
@@ -55,7 +58,7 @@ public class MediaApi extends QyApi {
 	 * @param file
 	 *            媒体对象
 	 * @return 上传到微信服务器返回的媒体标识
-	 * @see {@link com.foxinmy.weixin4j.qy.api.MediaApi#uploadMedia(File, MediaType)}
+	 * @see {@link com.foxinmy.weixin4j.qy.api.MediaApi#uploadMedia(InputStream, MediaType)}
 	 * @throws WeixinException
 	 * @throws IOException
 	 */
@@ -64,27 +67,17 @@ public class MediaApi extends QyApi {
 		if (StringUtil.isBlank(mediaTypeKey)) {
 			mediaTypeKey = FileUtil.getFileType(file);
 		}
-		MediaType mediaType = MediaType.getMediaType(mediaTypeKey);
-		return uploadMedia(file, mediaType);
-	}
-
-	/**
-	 * 上传媒体文件
-	 * 
-	 * @param file
-	 *            文件对象
-	 * @param mediaType
-	 *            媒体类型
-	 * @return 上传到微信服务器返回的媒体标识
-	 * @throws WeixinException
-	 * @throws IOException
-	 * @see com.foxinmy.weixin4j.type.MediaType
-	 * @see {@link com.foxinmy.weixin4j.qy.api.MediaApi#uploadMedia(String, byte[],String)}
-	 */
-	public String uploadMedia(File file, MediaType mediaType)
-			throws WeixinException, IOException {
-		byte[] datas = IOUtil.toByteArray(new FileInputStream(file));
-		return uploadMedia(file.getName(), datas, mediaType.name());
+		MediaType mediaType = null;
+		if (mediaTypeKey.equals("jpg")) {
+			mediaType = MediaType.image;
+		} else if ("amr/mp3".contains(mediaTypeKey)) {
+			mediaType = MediaType.voice;
+		} else if (mediaTypeKey.equals("mp4")) {
+			mediaType = MediaType.video;
+		} else {
+			mediaType = MediaType.file;
+		}
+		return uploadMedia(new FileInputStream(file), mediaType);
 	}
 
 	/**
@@ -94,8 +87,8 @@ public class MediaApi extends QyApi {
 	 * 否则抛出异常.
 	 * </p>
 	 * 
-	 * @param bytes
-	 *            媒体数据包
+	 * @param is
+	 *            媒体数据流
 	 * @param mediaType
 	 *            媒体类型
 	 * @return 上传到微信服务器返回的媒体标识
@@ -103,14 +96,25 @@ public class MediaApi extends QyApi {
 	 *      href="http://qydev.weixin.qq.com/wiki/index.php?title=%E4%B8%8A%E4%BC%A0%E5%AA%92%E4%BD%93%E6%96%87%E4%BB%B6">上传媒体文件说明</a>
 	 * @throws WeixinException
 	 */
-	public String uploadMedia(String fileName, byte[] bytes, String mediaType)
+	public String uploadMedia(InputStream is, MediaType mediaType)
 			throws WeixinException {
-		Token token = tokenHolder.getToken();
 		String file_upload_uri = getRequestUri("file_upload_uri");
-		WeixinResponse response = weixinClient.post(String.format(file_upload_uri,
-				token.getAccessToken(), mediaType), new FormBodyPart("media",
-				new ByteArrayBody(bytes, fileName)));
-
+		Token token = tokenHolder.getToken();
+		if (mediaType == null || mediaType == MediaType.news) {
+			mediaType = MediaType.file;
+		} else if (mediaType == MediaType.thumb) {
+			mediaType = MediaType.image;
+		}
+		WeixinResponse response = weixinClient.post(String.format(
+				file_upload_uri, token.getAccessToken(), mediaType),
+				new FormBodyPart("media", new InputStreamBody(is, mediaType
+						.getContentType().getMimeType(), ObjectId.get()
+						.toHexString())));
+		try {
+			is.close();
+		} catch (IOException e) {
+			;
+		}
 		return response.getAsJson().getString("media_id");
 	}
 
@@ -122,9 +126,7 @@ public class MediaApi extends QyApi {
 	 * 
 	 * @param mediaId
 	 *            存储在微信服务器上的媒体标识
-	 * @param extension
-	 *            媒体后缀名
-	 * @return 写入硬盘后的文件对象
+	 * @return 写入硬盘后的文件对象,存储路径见weixin4j.properties配置
 	 * @throws WeixinException
 	 * @throws IOException
 	 * @see <a
@@ -132,11 +134,9 @@ public class MediaApi extends QyApi {
 	 * @see com.foxinmy.weixin4j.type.MediaType
 	 * @see {@link com.foxinmy.weixin4j.qy.api.MediaApi#downloadMedia(String)}
 	 */
-	public File downloadMedia(String mediaId, String extension)
-			throws WeixinException {
+	public File downloadMediaFile(String mediaId) throws WeixinException {
 		String media_path = ConfigUtil.getValue("media_path");
-		File file = new File(media_path + File.separator + mediaId + "."
-				+ extension);
+		File file = new File(media_path + File.separator + mediaId);
 		if (file.exists()) {
 			return file;
 		}
@@ -158,7 +158,7 @@ public class MediaApi extends QyApi {
 				if (os != null) {
 					os.close();
 				}
-			} catch (IOException ignore) {
+			} catch (IOException e) {
 				;
 			}
 		}
@@ -178,8 +178,8 @@ public class MediaApi extends QyApi {
 	public byte[] downloadMedia(String mediaId) throws WeixinException {
 		Token token = tokenHolder.getToken();
 		String file_download_uri = getRequestUri("file_download_uri");
-		WeixinResponse response = weixinClient.get(String.format(file_download_uri,
-				token.getAccessToken(), mediaId));
+		WeixinResponse response = weixinClient.get(String.format(
+				file_download_uri, token.getAccessToken(), mediaId));
 		return response.getContent();
 	}
 
@@ -239,8 +239,8 @@ public class MediaApi extends QyApi {
 			writer.write(StringUtil.join(column.values(), ','));
 			writer.write("\r\n");
 		}
-		String mediaId = uploadMedia(batchName,
-				writer.toString().getBytes(Consts.UTF_8), MediaType.file.name());
+		String mediaId = uploadMedia(new ByteArrayInputStream(writer
+				.getBuffer().toString().getBytes(Consts.UTF_8)), MediaType.file);
 		try {
 			writer.close();
 		} catch (IOException e) {
diff --git a/weixin4j-qy/src/main/java/com/foxinmy/weixin4j/qy/api/UserApi.java b/weixin4j-qy/src/main/java/com/foxinmy/weixin4j/qy/api/UserApi.java
index a2efa871..ae2e0139 100644
--- a/weixin4j-qy/src/main/java/com/foxinmy/weixin4j/qy/api/UserApi.java
+++ b/weixin4j-qy/src/main/java/com/foxinmy/weixin4j/qy/api/UserApi.java
@@ -1,7 +1,6 @@
 package com.foxinmy.weixin4j.qy.api;
 
-import java.io.File;
-import java.io.IOException;
+import java.io.InputStream;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -17,6 +16,7 @@ import com.foxinmy.weixin4j.qy.model.User;
 import com.foxinmy.weixin4j.qy.type.InviteType;
 import com.foxinmy.weixin4j.qy.type.UserStatus;
 import com.foxinmy.weixin4j.token.TokenHolder;
+import com.foxinmy.weixin4j.type.MediaType;
 
 /**
  * 成员API
@@ -67,7 +67,8 @@ public class UserApi extends QyApi {
 	 * @return 处理结果
 	 * @throws WeixinException
 	 */
-	public JsonResult createUser(User user, File avatar) throws WeixinException {
+	public JsonResult createUser(User user, InputStream avatar)
+			throws WeixinException {
 		String user_create_uri = getRequestUri("user_create_uri");
 		return excute(user_create_uri, user, avatar);
 	}
@@ -101,12 +102,13 @@ public class UserApi extends QyApi {
 	 * @return 处理结果
 	 * @throws WeixinException
 	 */
-	public JsonResult updateUser(User user, File avatar) throws WeixinException {
+	public JsonResult updateUser(User user, InputStream avatar)
+			throws WeixinException {
 		String user_update_uri = getRequestUri("user_update_uri");
 		return excute(user_update_uri, user, avatar);
 	}
 
-	private JsonResult excute(String uri, User user, File avatar)
+	private JsonResult excute(String uri, User user, InputStream avatar)
 			throws WeixinException {
 		JSONObject obj = (JSONObject) JSON.toJSON(user);
 		Object extattr = obj.remove("extattr");
@@ -116,11 +118,8 @@ public class UserApi extends QyApi {
 			obj.put("extattr", attrs);
 		}
 		if (avatar != null) {
-			try {
-				obj.put("avatar_mediaid", mediaApi.uploadMedia(avatar));
-			} catch (IOException e) {
-				throw new WeixinException(e);
-			}
+			obj.put("avatar_mediaid",
+					mediaApi.uploadMedia(avatar, MediaType.image));
 		}
 		Token token = tokenHolder.getToken();
 		WeixinResponse response = weixinClient.post(
diff --git a/weixin4j-qy/src/test/java/com/foxinmy/weixin4j/qy/test/MediaTest.java b/weixin4j-qy/src/test/java/com/foxinmy/weixin4j/qy/test/MediaTest.java
index 231e4eda..e7f3159d 100644
--- a/weixin4j-qy/src/test/java/com/foxinmy/weixin4j/qy/test/MediaTest.java
+++ b/weixin4j-qy/src/test/java/com/foxinmy/weixin4j/qy/test/MediaTest.java
@@ -9,7 +9,6 @@ import org.junit.Test;
 
 import com.foxinmy.weixin4j.exception.WeixinException;
 import com.foxinmy.weixin4j.qy.api.MediaApi;
-import com.foxinmy.weixin4j.type.MediaType;
 
 /**
  * 媒体上传下载测试
@@ -32,7 +31,7 @@ public class MediaTest extends TokenTest {
 	@Test
 	public void upload() throws IOException, WeixinException {
 		File file = new File("/tmp/test.docx");
-		String mediaId = mediaApi.uploadMedia(file, MediaType.file);
+		String mediaId = mediaApi.uploadMedia(file);
 		// 1-1gpykXsR8bhNvO13-ZvskptCBxQF1UE535jFdCF63N2inGRAqEb-psF6eppjIIl
 		// 1CF6sBgWWFGY9s4JCEet5ASszsTuyHpeN1f2LWXADveqBlKoxSgb3cO401NEM7dNY
 		Assert.assertNotNull(mediaId);
@@ -42,9 +41,7 @@ public class MediaTest extends TokenTest {
 	@Test
 	public void download() throws WeixinException, IOException {
 		File file = mediaApi
-				.downloadMedia(
-						"1CF6sBgWWFGY9s4JCEet5ASszsTuyHpeN1f2LWXADveqBlKoxSgb3cO401NEM7dNY",
-						"docx");
+				.downloadMediaFile("1CF6sBgWWFGY9s4JCEet5ASszsTuyHpeN1f2LWXADveqBlKoxSgb3cO401NEM7dNY");
 		Assert.assertTrue(file.exists());
 	}
 }
\ No newline at end of file