用gson和httpclient调用微信公众平台API

吐槽：微信api很无语，部分用xml，部分用json。

最近在找如何调用微信公众平台关于json相关的api比较方便，最后发现httpcliect和gson不错。如果你有更好的方式，请告诉我。

以下代码先了解如何使用gson和httpclient，有功夫再整到我的sophia里，呵呵。

 

import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStreamReader;import java.io.OutputStream;import java.io.Reader;import java.util.HashMap;import java.util.Map;import org.apache.http.Consts;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.StatusLine;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.HttpResponseException;import org.apache.http.client.ResponseHandler;import org.apache.http.client.methods.CloseableHttpResponse;import org.apache.http.client.methods.HttpGet;import org.apache.http.client.methods.HttpPost;import org.apache.http.entity.ContentType;import org.apache.http.entity.StringEntity;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.HttpClients;import org.apache.http.util.EntityUtils;import com.google.gson.Gson;import com.google.gson.GsonBuilder;import com.google.gson.JsonObject;public class JsonTest {/** * 获取access token * @return * @throws ClientProtocolException * @throws IOException */public static String getToken() throws ClientProtocolException, IOException {CloseableHttpClient httpclient = HttpClients.createDefault();//String appid = "eeeeeeee";String secret = "eeeeeeeeeeeeeeee";HttpGet httpget = new HttpGet("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" + appid + "&secret=" + secret) ;ResponseHandler<JsonObject> rh = new ResponseHandler<JsonObject>() {    @Override    public JsonObject handleResponse(            final HttpResponse response) throws IOException {        StatusLine statusLine = response.getStatusLine();        HttpEntity entity = response.getEntity();        if (statusLine.getStatusCode() >= 300) {            throw new HttpResponseException(                    statusLine.getStatusCode(),                    statusLine.getReasonPhrase());        }        if (entity == null) {            throw new ClientProtocolException("Response contains no content");        }        Gson gson = new GsonBuilder().create();        //ContentType contentType = ContentType.getOrDefault(entity);        //Charset charset = contentType.getCharset();        Reader reader = new InputStreamReader(entity.getContent());        return gson.fromJson(reader, JsonObject.class);    }};JsonObject myjson = httpclient.execute(httpget, rh);System.out.println(myjson.get("access_token").getAsString());return myjson.get("access_token").getAsString();}/** * 下载文件 * @throws ClientProtocolException * @throws IOException */public static void  downloadMediaFile(String token) throws ClientProtocolException, IOException {String mediaId = "fdsddddddddddd";String url = "http://file.api.weixin.qq.com/cgi-bin/media/get?access_token=ACCESS_TOKEN&media_id=MEDIA_ID";url = url.replaceAll("ACCESS_TOKEN", token);url = url.replaceAll("MEDIA_ID", mediaId);CloseableHttpClient httpclient = HttpClients.createDefault();HttpGet httpget = new HttpGet(url);CloseableHttpResponse response = httpclient.execute(httpget);try {    HttpEntity entity = response.getEntity();    if (entity != null) {        long len = entity.getContentLength();        if (len != -1) {            byte[] content = EntityUtils.toByteArray(entity);            System.out.println(response.getStatusLine());            OutputStream os = new FileOutputStream("/Users/sssss/abc.jpg");// 开始读取 os.write(content);// 完毕，关闭所有链接os.close();        } else {            // Stream content out        }    }} finally {    response.close();}}/** * post json格式数据包  ----- 客服消息 * @param map * @throws ClientProtocolException * @throws IOException */public static void postJsonData(Map map) throws ClientProtocolException, IOException {String token = "lv3s0iunvVvEj9K3bz12xofvXfW1916ePLqZ7mN6mx7reY-IDzPTrwoErd4pSMD4eSps56QbmbaQ";String url = "https://api.weixin.qq.com/cgi-bin/message/custom/send?access_token=ACCESS_TOKEN";url = url.replaceAll("ACCESS_TOKEN", token);CloseableHttpClient httpclient = HttpClients.createDefault();Gson gson = new Gson();StringEntity entity = new StringEntity(gson.toJson(map),        ContentType.create("plain/text", Consts.UTF_8));entity.setChunked(true);HttpPost httppost = new HttpPost(url);httppost.setEntity(entity);CloseableHttpResponse response = httpclient.execute(httppost);System.out.println(response.getStatusLine());}   public static void main(String[] args) throws ClientProtocolException, IOException {String token = getToken();downloadMediaFile(token);//客服消息Map map = new HashMap();map.put("touser", "o3Y0et021tT_MVK2bdY1DhSWwFCc");map.put("msgtype", "text");Map m = new HashMap();m.put("content", "hello world");map.put("text", m);postJsonData(map);}}

不好意思，昨天晚上发表文章，csdn老失败。导致只有标题。