Implement jscode2session API of Mini Program.

weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/WeixinProxy.java

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+package com.foxinmy.weixin4j.wxa;
+
+import com.foxinmy.weixin4j.model.WeixinAccount;
+import com.foxinmy.weixin4j.wxa.api.LoginApi;
+
+public class WeixinProxy {
+
+	private final LoginApi loginApi;
+
+	public WeixinProxy(WeixinAccount weixinAccount) {
+		if (weixinAccount == null) {
+			throw new IllegalArgumentException(
+				"weixinAccount must not be empty");
+		}
+
+		this.loginApi = new LoginApi(weixinAccount);
+	}
+
+	public LoginApi getLoginApi() {
+		return loginApi;
+	}
+
+}

weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/api/LoginApi.java

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+package com.foxinmy.weixin4j.wxa.api;
+
+import com.alibaba.fastjson.TypeReference;
+import com.foxinmy.weixin4j.exception.WeixinException;
+import com.foxinmy.weixin4j.http.weixin.WeixinResponse;
+import com.foxinmy.weixin4j.model.WeixinAccount;
+import com.foxinmy.weixin4j.wxa.model.Session;
+
+public class LoginApi extends WxaApi {
+
+	private final WeixinAccount weixinAccount;
+
+	public LoginApi(WeixinAccount weixinAccount) {
+		this.weixinAccount = weixinAccount;
+	}
+
+	public Session jscode2session(String jsCode) throws WeixinException {
+		return jscode2session(jsCode, "authorization_code");
+	}
+
+	/**
+	 * 登录凭证校验
+	 *
+	 * @param jsCode 登录时获取的 code
+	 * @param grantType 填写为 authorization_code
+	 * @return the session.
+	 * @throws WeixinException 发生错误时。比如 <code>js_code</code> 无效。
+	 * @see <a href="https://developers.weixin.qq.com/miniprogram/dev/api/api-login.html#wxloginobject">登录凭证校验<a/>
+	 */
+	public Session jscode2session(String jsCode, String grantType) throws WeixinException {
+		String jscode2sessionUri = getRequestUri("sns_jscode2session",
+			weixinAccount.getId(), weixinAccount.getSecret(), jsCode, grantType);
+		WeixinResponse response = weixinExecutor.get(jscode2sessionUri);
+		return response.getAsObject(new TypeReference<Session>() {
+		});
+	}
+
+}

weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/api/WxaApi.java

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+package com.foxinmy.weixin4j.wxa.api;
+
+import java.util.ResourceBundle;
+
+import com.foxinmy.weixin4j.api.BaseApi;
+
+public abstract class WxaApi extends BaseApi {
+
+	private static final ResourceBundle WEIXIN_BUNDLE;
+
+	static {
+		WEIXIN_BUNDLE = ResourceBundle
+			.getBundle("com/foxinmy/weixin4j/wxa/api/weixin");
+	}
+	@Override
+	protected ResourceBundle weixinBundle() {
+		return WEIXIN_BUNDLE;
+	}
+
+	protected String getRequestUri(String key, Object... args) {
+		return String.format(getRequestUri(key), args);
+	}
+
+}

weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/api/package-info.java

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+package com.foxinmy.weixin4j.wxa.api;

weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/api/weixin.properties

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+# \u5fae\u4fe1\u516c\u4f17\u5e73\u53f0|\u5c0f\u7a0b\u5e8f\u6587\u6863\u8bf4\u660e
+# https://developers.weixin.qq.com/miniprogram/dev/api/
+# ----------------------------------------------------------------------------
+
+api_base_url=https://api.weixin.qq.com
+
+# \u767b\u5f55\u51ed\u8bc1\u6821\u9a8c
+sns_jscode2session={api_base_url}/sns/jscode2session?appid=%s&secret=%s&js_code=%s&grant_type=%s

weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/model/Session.java

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+package com.foxinmy.weixin4j.wxa.model;
+
+import java.io.Serializable;
+
+public class Session implements Serializable {
+
+	private static final long serialVersionUID = 2018051801L;
+
+	private String openId;
+	private String sessionKey;
+	private String unionId;
+
+	public String getOpenId() {
+		return openId;
+	}
+
+	public void setOpenId(String openId) {
+		this.openId = openId;
+	}
+
+	public String getSessionKey() {
+		return sessionKey;
+	}
+
+	public void setSessionKey(String sessionKey) {
+		this.sessionKey = sessionKey;
+	}
+
+	public String getUnionId() {
+		return unionId;
+	}
+
+	public void setUnionId(String unionId) {
+		this.unionId = unionId;
+	}
+
+}

weixin4j-wxa/src/main/java/com/foxinmy/weixin4j/wxa/model/package-info.java

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+package com.foxinmy.weixin4j.wxa.model;

weixin4j-wxa/src/test/java/com/foxinmy/weixin4j/wxa/model/SessionTest.java

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+package com.foxinmy.weixin4j.wxa.model;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+
+import org.junit.Test;
+
+import com.alibaba.fastjson.JSON;
+
+public class SessionTest {
+
+	@Test
+	public void test() {
+		Session session = JSON.parseObject("{\"openid\": \"OPENID\", \"session_key\": \"SESSIONKEY\"}", Session.class);
+		assertEquals("OPENID", session.getOpenId());
+		assertEquals("SESSIONKEY", session.getSessionKey());
+		assertNull(session.getUnionId());
+
+		session = JSON.parseObject("{\"openid\": \"OPENID\", \"session_key\": \"SESSIONKEY\", \"unionid\": \"UNIONID\"}", Session.class);
+		assertEquals("OPENID", session.getOpenId());
+		assertEquals("SESSIONKEY", session.getSessionKey());
+		assertEquals("UNIONID", session.getUnionId());
+	}
+
+}