httpClient 实现微信公众号消息群发

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来源：WhyWin，

www.cnblogs.com/0201zcr/p/5893600.html

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1、实现功能

向关注了微信公众号的微信用户群发消息。（可以是所有的用户，也可以是提供了微信openid的微信用户集合）

2、基本步骤

前提：

已经有认证的公众号或者测试公众账号

发送消息步 骤：

1. 发送一个请求微信去获取access_token

2. 发送一个请求去请求微信发送消息

相关微信接口的信息可以查看：

http://www.cnblogs.com/0201zcr/p/5866296.html

有测试账号的申请 + 获取access_token和发送微信消息的url和相关的参数需求。各个参数的意义等。

3、实践

这里通过HttpClient发送请求去微信相关的接口。

1）maven依赖

org.apache.httpcomponents

httpclient

4.3.1

2）httpClient使用方法

使用HttpClient发送请求、接收响应很简单，一般需要如下几步即可。

1. 创建HttpClient对象。

   
   

2. 创建请求方法的实例，并指定请求URL。如果需要发送GET请求，创建HttpGet对象；如果需要发送POST请求，创建HttpPost对象。

   
   

3. 如果需要发送请求参数，可调用HttpGet、HttpPost共同的setParams(HetpParams params)方法来添加请求参数；对于HttpPost对象而言，也可调用setEntity(HttpEntity entity)方法来设置请求参数。

   
   

4. 调用HttpClient对象的execute(HttpUriRequest request)发送请求，该方法返回一个HttpResponse。

   
   

5. 调用HttpResponse的getAllHeaders()、getHeaders(String name)等方法可获取服务器的响应头；调用HttpResponse的getEntity()方法可获取HttpEntity对象，该对象包装了服务器的响应内容。程序可通过该对象获取服务器的响应内容。

   
   

6. 释放连接。无论执行方法是否成功，都必须释放连接——这里使用了连接池，可以交给连接池去处理

3）实例

1、发送请求的类

import com.alibaba.druid.support.json.JSONUtils;

import com.alibaba.druid.support.logging.Log;

import com.alibaba.druid.support.logging.LogFactory;

import com.alibaba.fastjson.JSON;

import com.alibaba.fastjson.JSONObject;

import com.seewo.core.util.json.JsonUtils;

import org.apache.commons.collections.map.HashedMap;

import org.apache.commons.lang.StringUtils;

import org.apache.http.HttpHost;

import org.apache.http.NameValuePair;

import org.apache.http.client.ClientProtocolException;

import org.apache.http.client.HttpClient;

import org.apache.http.client.ResponseHandler;

import org.apache.http.client.methods.HttpGet;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.conn.params.ConnRoutePNames;

import org.apache.http.conn.scheme.Scheme;

import org.apache.http.conn.ssl.SSLSocketFactory;

import org.apache.http.entity.StringEntity;

import org.apache.http.impl.client.BasicResponseHandler;

import org.apache.http.impl.client.DefaultHttpClient;

import org.apache.http.impl.conn.PoolingClientConnectionManager;

import org.apache.http.message.BasicNameValuePair;

import org.springframework.http.HttpHeaders;

import org.springframework.http.MediaType;

import javax.net.ssl.SSLContext;

import javax.net.ssl.X509TrustManager;

import javax.security.cert.CertificateException;

import javax.security.cert.X509Certificate;

import java.io.IOException;

import java.text.MessageFormat;

import java.util.ArrayList;

import java.util.List;

import java.util.Map;

/**

* Created by zhengcanrui on 16/9/20.

*/

public class WechatAPIHander {

/**

* 获取token接口

*/

private String getTokenUrl = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}";

/**

* 拉微信用户信息接口

*/

private String getUserInfoUrl = "https://api.weixin.qq.com/cgi-bin/user/info?access_token={0}&openid={1}";

/**

* 主动推送信息接口(群发)

*/

private String sendMsgUrl = "https://api.weixin.qq.com/cgi-bin/message/mass/sendall?access_token={0}";

private HttpClient webClient;

private Log log = LogFactory.getLog(getClass());

public void initWebClient(String proxyHost, int proxyPort){

this.initWebClient();

if(webClient != null && !StringUtils.isEmpty(proxyHost)){

HttpHost proxy = new HttpHost(proxyHost, proxyPort);

webClient.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY, proxy);

}

}

/**

* @desc 初始化创建 WebClient

*/

public void initWebClient() {

log.info("initWebClient start....");

try {

PoolingClientConnectionManager tcm = new PoolingClientConnectionManager();

tcm.setMaxTotal(10);

SSLContext ctx = SSLContext.getInstance("TLS");

X509TrustManager tm = new X509TrustManager() {

@Override

public void checkClientTrusted(java.security.cert.X509Certificate[] x509Certificates, String s) throws java.security.cert.CertificateException {

}

@Override

public void checkServerTrusted(java.security.cert.X509Certificate[] x509Certificates, String s) throws java.security.cert.CertificateException {

}

@Override

public java.security.cert.X509Certificate[] getAcceptedIssuers() {

return new java.security.cert.X509Certificate[0];

}

};

ctx.init(null, new X509TrustManager[] { tm }, null);

SSLSocketFactory ssf = new SSLSocketFactory(ctx, SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);

Scheme sch = new Scheme("https", 443, ssf);

tcm.getSchemeRegistry().register(sch);

webClient = new DefaultHttpClient(tcm);

} catch (Exception ex) {

log.error("initWebClient exception", ex);

} finally {

log.info("initWebClient end....");

}

}

/**

* @desc 获取授权token

* @param appid

* @param secret

* @return

*/

public String getAccessToken(String appid, String secret) {

String accessToken = null;

try {

log.info("getAccessToken start.{appid=" + appid + ",secret:" + secret + "}");

String url = MessageFormat.format(this.getTokenUrl, appid, secret);

String response = executeHttpGet(url);

Map map = JsonUtils.jsonToMap(response);

accessToken = (String) map.get("access_token");

/* Object Object = JSONUtils.parse(response);

accessToken = jsonObject.getString("access_token");*/

//                accessToken = JsonUtils.read(response, "access_token");

} catch (Exception e) {

log.error("get access toekn exception", e);

}

return accessToken;

}

/**

* @desc 推送信息

* @param token

* @param msg

* @return

*/

public String sendMessage(String token,String msg){

try{

log.info("\n\nsendMessage start.token:"+token+",msg:"+msg);

String url = MessageFormat.format(this.sendMsgUrl, token);

HttpPost post = new HttpPost(url);

ResponseHandler> responseHandler = new BasicResponseHandler();

//这里必须是一个合法的json格式数据,每个字段的意义可以查看上面连接的说明,content后面的test是要发送给用户的数据,这里是群发给所有人

msg = "{\"filter\":{\"is_to_all\":true},\"text\":{\"content\":\"test\"},\"msgtype\":\"text\"}\"";

//设置发送消息的参数

StringEntity entity = new StringEntity(msg);

//解决中文乱码的问题

entity.setContentEncoding("UTF-8");

entity.setContentType("application/json");

post.setEntity(entity);

//发送请求

String response = (String) this.webClient.execute(post, responseHandler);

log.info("return response=====start======");

log.info(response);

log.info("return response=====end======");

return response;

}catch (Exception e) {

log.error("get user info exception", e);

return null;

}

}

/**

* @desc 发起HTTP GET请求返回数据

* @param url

* @return

* @throws IOException

* @throws ClientProtocolException

*/

private String executeHttpGet(String url) throws IOException, ClientProtocolException {

ResponseHandler> responseHandler = new BasicResponseHandler();

String response = (String) this.webClient.execute(new HttpGet(url), responseHandler);

log.info("return response=====start======");

log.info(response);

log.info("return response=====end======");

return response;

}

}

2、Controller和Service层调用

@RequestMapping(value = "/testHttpClient", method = RequestMethod.GET)

public DataMap test() {

WechatAPIHander wechatAPIHander = new WechatAPIHander();

//获取access_token

//第一个参数是你appid，第二个参数是你的秘钥，需要根据你的具体情况换

String accessToken = wechatAPIHander.getAccessToken("appid","scerpt");

//发送消息

wechatAPIHander.sendMessage(accessToken, "测试数据");

return new DataMap().addAttribute("DATA",accessToken);

}

3、结果

假如你关注了微信公众号中看到你刚刚发送的test消息。

HttpClient学习文档：https://pan.baidu.com/s/1miO1eOg

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