java调用企业微信发送消息的代码

可以使用企业微信提供的API实现发送消息。以下是一个示例代码：

import java.io.*;
import java.net.*;
import java.util.*;

public class SendMessage {
    public static void main(String[] args) {
        String corpid = "企业ID";
        String corpsecret = "应用Secret";
        String url = "https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid=" + corpid + "&corpsecret=" + corpsecret;

        String token = "";
        try {
            URL obj = new URL(url);
            HttpURLConnection con = (HttpURLConnection) obj.openConnection();

            con.setRequestMethod("GET");

            BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
            String inputLine;
            StringBuffer response = new StringBuffer();
            while ((inputLine = in.readLine()) != null) {
                response.append(inputLine);
            }
            in.close();

            token = response.toString();
        } catch (Exception ex) {
            System.out.println("异常：" + ex);
        }

        String access_token = "";

        try {
            access_token = (new org.json.JSONObject(token)).getString("access_token");
        } catch (Exception ex) {
            System.out.println("异常：" + ex);
        }

        String msg = "Hello World!";
        String touser = "UserID1|UserID2";
        String toparty = "";
        String totag = "";
        String agentid = "应用ID";
        String url_send = "https://qyapi.weixin.qq.com/cgi-bin/message/send?access_token=" + access_token;

        try {
            URL obj = new URL(url_send);
            HttpURLConnection con = (HttpURLConnection) obj.openConnection();

            con.setRequestMethod("POST");
            con.setRequestProperty("Content-Type", "application/json;charset=UTF-8");

            String postBody = "{\"touser\":\"" + touser + "\",\"toparty\":\"" + toparty + "\",\"totag\":\"" + totag + "\",\"msgtype\":\"text\",\"agentid\":\"" + agentid + "\",\"text\":{\"content\":\"" + msg + "\"}}";

            con.setDoOutput(true);
            DataOutputStream wr = new DataOutputStream(con.getOutputStream());
            wr.writeBytes(postBody);
            wr.flush();
            wr.close();

            BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
            String inputLine;
            StringBuffer response = new StringBuffer();
            while ((inputLine = in.readLine()) != null) {
                response.append(inputLine);
            }
            in.close();

            System.out.println("发送结果：" + response.toString());
        } catch (Exception ex) {
            System.out.println("异常：" + ex);
        }
    }
}

请注意，您需要替换代码中的企业ID，应用Secret，应用ID，用户ID和消息内容。