调整Exception类中的消息描述

weixin4j-mp/src/main/java/com/foxinmy/weixin4j/mp/api/MediaApi.java

@@ -272,7 +272,7 @@ public class MediaApi extends MpApi {
 						file.getAbsolutePath()));
 			}
 		} catch (IOException e) {
-			throw new WeixinException(e.getMessage());
+			throw new WeixinException(e);
 		} finally {
 			try {
 				if (os != null) {
@@ -346,7 +346,7 @@ public class MediaApi extends MpApi {
 			return new MediaDownloadResult(content,
 					ContentType.create(contentType), fileName);
 		} catch (IOException e) {
-			throw new WeixinException("I/O Error on getBody");
+			throw new WeixinException("I/O Error on getBody", e);
 		} catch (HttpClientException e) {
 			throw new WeixinException(e);
 		}

weixin4j-mp/src/main/java/com/foxinmy/weixin4j/mp/api/Pay2Api.java

@@ -238,7 +238,7 @@ public class Pay2Api extends MpApi {
 		} catch (WeixinException e) {
 			throw e;
 		} catch (Exception e) {
-			throw new WeixinException(e.getMessage());
+			throw new WeixinException(e);
 		} finally {
 			if (ca != null) {
 				try {
@@ -389,7 +389,7 @@ public class Pay2Api extends MpApi {
 				writer.newLine();
 			}
 		} catch (IOException e) {
-			throw new WeixinException(e.getMessage());
+			throw new WeixinException(e);
 		} finally {
 			try {
 				if (reader != null) {

weixin4j-mp/src/main/java/com/foxinmy/weixin4j/mp/api/QrApi.java

@@ -95,7 +95,7 @@ public class QrApi extends MpApi {
 			os = new FileOutputStream(file);
 			os.write(qrResult.getContent());
 		} catch (IOException e) {
-			throw new WeixinException(e.getMessage());
+			throw new WeixinException(e);
 		} finally {
 			try {
 				if (os != null) {