一、微信消息分组群发接口简介
1、请求：该请求是使用post提交地址为：
https://api.weixin.qq.com/cgi-bin/message/mass/sendall?access_token=ACCESS_TOKEN
其中ACCESS_TOKEN是我们动态获取的。
发送的数据：(这里使用图文消息示例)
{ "filter":{ "group_id":"2" }, "mpnews":{ "media_id":"123dsdajkasd231jhksad" }, "msgtype":"mpnews"} filter，用于设定图文消息的接收者；
group_id，群发到的分组的group_id（可在java微信接口之二—获取用户组）；mpnews,用于设定即将发送的图文消息；
media_id, 用于群发的消息的media_id(可在java微信接口之四—上传素材中获取)； msgtype,群发的消息类型，图文消息为mpnews，文本消息为text，语音为voice，音乐为music，图片为image，视频为video.
2、响应：该响应也是以json方式返回的
正确的时候返回的数据：
{ "errcode":0, "errmsg":"send job submission success", "msg_id":34182} errcode 错误码
errmsg 错误信息 msg_id 消息ID错误的时候返回的数据：{"errcode":40004,"errmsg":"invalid media type"}
errcode，为错误代码，errmsg为错误信息
具体api可查看：
二、关于java代码的调用
该接口的调用与java微信接口四—上传素材一样，需要使用到commons-httpclient。其中数据是构造成json数据后，放在post方法请求体里面发送给服务器端。
三、代码实现
1 package com.demo.test; 2 3 import java.io.File; 4 import java.util.ArrayList; 5 import java.util.HashMap; 6 import java.util.List; 7 import java.util.Map; 8 9 import org.apache.commons.httpclient.methods.PostMethod; 10 import org.apache.commons.httpclient.methods.multipart.FilePart; 11 import org.apache.commons.httpclient.methods.multipart.MultipartRequestEntity; 12 import org.apache.commons.httpclient.methods.multipart.Part; 13 import org.apache.http.HttpEntity; 14 import org.apache.http.HttpResponse; 15 import org.apache.http.HttpStatus; 16 import org.apache.http.client.HttpClient; 17 import org.apache.http.client.methods.HttpGet; 18 import org.apache.http.impl.client.DefaultHttpClient; 19 import org.apache.http.util.EntityUtils; 20 21 import com.google.gson.Gson; 22 import com.google.gson.JsonArray; 23 import com.google.gson.JsonObject; 24 import com.google.gson.JsonParser; 25 26 public class Test 27 { 28 public static final String GET_TOKEN_URL = "https://api.weixin.qq.com/cgi-bin/token";// 获取access 29 public static final String UPLOAD_IMAGE_URL = "http://file.api.weixin.qq.com/cgi-bin/media/upload";// 上传多媒体文件 30 public static final String UPLOAD_FODDER_URL = "https://api.weixin.qq.com/cgi-bin/media/uploadnews"; 31 public static final String GET_USER_GROUP = "https://api.weixin.qq.com/cgi-bin/groups/get"; // url 32 public static final String SEND_MESSAGE_URL = "https://api.weixin.qq.com/cgi-bin/message/mass/sendall"; 33 public static final String APP_ID = "wxa549b28c24cf341e"; 34 public static final String SECRET = "78d8a8cd7a4fa700142d06b96bf44a37"; 35 36 37 /** 38 * 发送消息 39 * 40 * @param uploadurl 41 * apiurl 42 * @param access_token 43 * @param data 44 * 发送数据 45 * @return 46 */ 47 public static String sendMsg(String url, String token, String data) 48 { 49 org.apache.commons.httpclient.HttpClient client = new org.apache.commons.httpclient.HttpClient(); 50 String sendurl = String.format("%s?access_token=%s", url, token); 51 PostMethod post = new UTF8PostMethod(sendurl); 52 post 53 .setRequestHeader( 54 "User-Agent", 55 "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:30.0) Gecko/20100101 Firefox/30.0"); 56 57 post.setRequestHeader("Host", "file.api.weixin.qq.com"); 58 post.setRequestHeader("Connection", "Keep-Alive"); 59 post.setRequestHeader("Cache-Control", "no-cache"); 60 String result = null; 61 try 62 { 63 post.setRequestBody(data); 64 int status = client.executeMethod(post); 65 if (status == HttpStatus.SC_OK) 66 { 67 String responseContent = post.getResponseBodyAsString(); 68 System.out.println(responseContent); 69 JsonParser jsonparer = new JsonParser();// 初始化解析json格式的对象 70 JsonObject json = jsonparer.parse(responseContent) 71 .getAsJsonObject(); 72 if (json.get("errcode") != null 73 && json.get("errcode").getAsString().equals("0")) 74 { 75 result = json.get("errmsg").getAsString(); 76 } 77 } 78 } 79 catch (Exception e) 80 { 81 e.printStackTrace(); 82 } 83 finally 84 { 85 return result; 86 } 87 } 88 89 public static class UTF8PostMethod extends PostMethod { //防止发送的消息产生乱码 90 public UTF8PostMethod(String url) { 91 super(url); 92 } 93 94 @Override 95 public String getRequestCharSet() { //文本编码格式 96 return "UTF-8"; 97 } 98 } 99 100 public static void main(String[] args) throws Exception101 {102 String accessToken = getToken(GET_TOKEN_URL, APP_ID, SECRET);// 获取token在微信接口之一中获取103 if (accessToken != null)// token成功获取104 {105 System.out.println(accessToken);106 File file = new File("f:" + File.separator + "2000.JPG"); // 获取本地文件107 String id = uploadImage(UPLOAD_IMAGE_URL, accessToken, "image",108 file);// java微信接口之三—上传多媒体文件 可获取109 if (id != null)110 {111 // 构造数据112 Map map = new HashMap();113 map.put("thumb_media_id", id);114 map.put("author", "wxx");115 map.put("title", "标题");116 map.put("content", "测试fdsfdsfsdfssfdsfsdfsdfs");117 map.put("digest", "digest");118 map.put("show_cover_pic", "0");119 120 Map map2 = new HashMap();121 map2.put("thumb_media_id", id);122 map2.put("author", "wxx");123 map2.put("content_source_url", "www.google.com");124 map2.put("title", "标题");125 map2.put("content", "测试fdsfdsfsdfssfdsfsdfsdfs");126 map2.put("digest", "digest");127 128 Map map3 = new HashMap();129 List 发成功后会打印消息，但由于微信服务器的原因，消息不会立即发送，会过一段时间发送。