java通过API给企业微信用户发送微信消息

成果：

描述：

最近工作需要根据需求把跟进记录推送至企业微信用户，提醒对方查看。
参考自企业微信API： https://work.weixin.qq.com/api/doc#90000/90135/90236

准备工作：

写在前面：仔细阅读API文档:在企业微信开发最开始的地方有这样一段话：https://work.weixin.qq.com/api/doc#90000/90135/91039

我就在这里卡住了一会！！！通过调用不同的接口要提供对应的token 及参数

一、：在企业微信管理后台创建自建应用如下：

点进去如下：

可以看到又AgentId Secret 两个参数：其中Secret 是用来与企业ID（别说你不知道）一块生成acces_token 用的，AgentId是用来作为发消息时使用的参数用的（因该是给后台确实使用哪个身份发送消息用的）如果AgentId 与通过Secret生成的token不配对会提示你：

好，开始：步骤如下;

通过https请求，使用企业ID和Sercet 获取token ：然后使用Token构造post请求发出去over
Https 请求需在本地构造一下:

package wechat; /**
 * TODO:
 *
 * @author David
 * @version 1.o
 * @date 2019-03-27 15:15
 */
import javax.net.ssl.X509TrustManager;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

public class MyX509trustManager implements X509TrustManager {
    @Override
    public void checkClientTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException { }

    @Override
    public void checkServerTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException { }

    @Override
    public X509Certificate[] getAcceptedIssuers() {  return null;  }
}

然后(好用记得点个赞)：

package wechat; /**
 * TODO:
 *
 * @author David
 * @version 1.o
 * @date 2019-03-27 15:14
 */
import net.sf.json.JSONObject;

import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.URL;

public class WeChatSync {
    /*获取token*/
    public static String getSendMsgToken() throws Exception {
        String requestUrl = "https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid=自己企业ID的不给你们看&corpsecret=自己的secret不给你们看";//注意与AgenId（若有） 对应使用

        String requestMethod = "GET";
        String outputStr = null;
        StringBuffer buffer = null;

        //创建SSLContext
        SSLContext sslContext = SSLContext.getInstance("SSL");
        TrustManager[] tm = {new MyX509trustManager()};
        //初始化
        sslContext.init(null, tm, new java.security.SecureRandom());

        //获取SSLSocketFactory对象
        SSLSocketFactory ssf = sslContext.getSocketFactory();
        URL url = new URL(requestUrl);
        HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
        conn.setDoOutput(true);
        conn.setDoInput(true);
        conn.setUseCaches(false);
        conn.setRequestMethod(requestMethod);
        //设置当前实例使用的SSLSoctetFactory
        conn.setSSLSocketFactory(ssf);
        conn.connect();
        //往服务器端写内容
        if (null != outputStr) {
            OutputStream os = conn.getOutputStream();
            os.write(outputStr.getBytes("utf-8"));
            os.close();
        }
        //读取服务器端返回的内容
        InputStream is = conn.getInputStream();
        InputStreamReader isr = new InputStreamReader(is, "utf-8");
        BufferedReader br = new BufferedReader(isr);
        buffer = new StringBuffer();
        String line = null;
        while ((line = br.readLine()) != null) {
            buffer.append(line);
        }
        JSONObject jsonObject = JSONObject.fromObject(buffer.toString());
        String accesstoken = jsonObject.getString("access_token");
        System.out.println("获取到的Token---------"+accesstoken);
        return accesstoken;
    }
    //发送信息
    public static String SendMsgtoBody(JSONObject outputStr) throws Exception {
        String requestUrl="https://qyapi.weixin.qq.com/cgi-bin/message/send";
        String requestMethod = "POST";
        StringBuffer buffer = null;

        //创建SSLContext
        SSLContext sslContext = SSLContext.getInstance("SSL");
        TrustManager[] tm = {new MyX509trustManager()};
        //初始化
        sslContext.init(null, tm, new java.security.SecureRandom());
        ;
        //获取SSLSocketFactory对象
        SSLSocketFactory ssf = sslContext.getSocketFactory();
        URL url = new URL(requestUrl + "?access_token=" + getSendMsgToken());
        HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
        conn.setDoOutput(true);
        conn.setDoInput(true);
        conn.setUseCaches(false);
        conn.setRequestMethod(requestMethod);
        //设置当前实例使用的SSLSoctetFactory
        conn.setSSLSocketFactory(ssf);
        conn.connect();
        //往服务器端写内容
        if (null != outputStr) {
            OutputStream os = conn.getOutputStream();
            os.write(outputStr.toString().getBytes("utf-8"));
            os.close();
        }
        //读取服务器端返回的内容
        InputStream is = conn.getInputStream();
        InputStreamReader isr = new InputStreamReader(is, "utf-8");
        BufferedReader br = new BufferedReader(isr);
        buffer = new StringBuffer();
        String line = null;
        while ((line = br.readLine()) != null) {
            buffer.append(line);
        }
        JSONObject json1 = JSONObject.fromObject(buffer.toString());
        System.out.println(json1);
        String msg = json1 .getString("errmsg");
        return msg ;
      
    }

}

最后：

package wechat;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

/**
 * TODO:
 *
 * @author David
 * @version 1.o
 * @date 2019-03-27 15:16
 */
public class run {
    public static void main(String[] args) throws Exception {
        JSONObject insertdata=new JSONObject();
        JSONObject content=new JSONObject();
        content.put("content","\"你的快递已到，请携带工卡前往邮件中心领取。\\n出发前可查看邮件中心视频实况，聪明避开排队。");
        insertdata.put("touser","100001592");//这里是接收信息的人员id（多个人用 |  隔开）
        insertdata.put("msgtype","text");
        insertdata.put("agentid",1000014);//此处一定要与上面的自建应用AgentId对应
        insertdata.put("text",content);
        insertdata.put("safe",0);
        System.out.println(insertdata);
        WeChatSync.SendMsgtoBody(insertdata);

    }
}

看到最后的都是好人 /比心