java通過API給企業微信用戶發送微信消息

成果：

描述：

最近工作需要根據需求把跟進記錄推送至企業微信用戶，提醒對方查看。
參考自企業微信API： https://work.weixin.qq.com/api/doc#90000/90135/90236

準備工作：

寫在前面：仔細閱讀API文檔:在企業微信開發最開始的地方有這樣一段話：https://work.weixin.qq.com/api/doc#90000/90135/91039

我就在這裏卡住了一會！！！通過調用不同的接口要提供對應的token 及參數

一、：在企業微信管理後臺創建自建應用如下：

點進去如下：

可以看到又AgentId Secret 兩個參數：其中Secret 是用來與企業ID（別說你不知道）一塊生成acces_token 用的，AgentId是用來作爲發消息時使用的參數用的（因該是給後臺確實使用哪個身份發送消息用的）如果AgentId 與通過Secret生成的token不配對會提示你：

好，開始：步驟如下;

通過https請求，使用企業ID和Sercet 獲取token ：然後使用Token構造post請求發出去over
Https 請求需在本地構造一下:

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;  }
}

然後(好用記得點個贊)：

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 {
    /*獲取token*/
    public static String getSendMsgToken() throws Exception {
        String requestUrl = "https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid=自己企業ID的不給你們看&corpsecret=自己的secret不給你們看";//注意與AgenId（若有） 對應使用

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

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

        //獲取SSLSocketFactory對象
        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);
        //設置當前實例使用的SSLSoctetFactory
        conn.setSSLSocketFactory(ssf);
        conn.connect();
        //往服務器端寫內容
        if (null != outputStr) {
            OutputStream os = conn.getOutputStream();
            os.write(outputStr.getBytes("utf-8"));
            os.close();
        }
        //讀取服務器端返回的內容
        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("獲取到的Token---------"+accesstoken);
        return accesstoken;
    }
    //發送信息
    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;

        //創建SSLContext
        SSLContext sslContext = SSLContext.getInstance("SSL");
        TrustManager[] tm = {new MyX509trustManager()};
        //初始化
        sslContext.init(null, tm, new java.security.SecureRandom());
        ;
        //獲取SSLSocketFactory對象
        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);
        //設置當前實例使用的SSLSoctetFactory
        conn.setSSLSocketFactory(ssf);
        conn.connect();
        //往服務器端寫內容
        if (null != outputStr) {
            OutputStream os = conn.getOutputStream();
            os.write(outputStr.toString().getBytes("utf-8"));
            os.close();
        }
        //讀取服務器端返回的內容
        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 ;
      
    }

}

最後：

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","\"你的快遞已到，請攜帶工卡前往郵件中心領取。\\n出發前可查看<a href=\\\"http://work.weixin.qq.com\\\">郵件中心視頻實況</a>，聰明避開排隊。");
        insertdata.put("touser","100001592");//這裏是接收信息的人員id（多個人用 |  隔開）
        insertdata.put("msgtype","text");
        insertdata.put("agentid",1000014);//此處一定要與上面的自建應用AgentId對應
        insertdata.put("text",content);
        insertdata.put("safe",0);
        System.out.println(insertdata);
        WeChatSync.SendMsgtoBody(insertdata);

    }
}

看到最後的都是好人 /比心