java微信消息推送

您可以使用Java的微信开放平台提供的接口来实现微信消息推送功能。下面是一个简单的示例代码：

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class WechatPush {
    public static void main(String[] args) {
        String url = "https://qyapi.weixin.qq.com/cgi-bin/message/send?access_token=YOUR_ACCESS_TOKEN";
        String method = "POST";
        String postData = "{\"touser\": \"UserID1|UserID2\",\"toparty\": \"PartyID1|PartyID2\",\"totag\": \"TagID1 | TagID2\",\"msgtype\": \"text\",\"agentid\": 1000002,\"text\": {\"content\": \"Hello World\"},\"safe\": 0}";

        try {
            URL apiUrl = new URL(url);
            HttpURLConnection connection = (HttpURLConnection) apiUrl.openConnection();
            connection.setRequestMethod(method);
            connection.setDoOutput(true);
            connection.setDoInput(true);

            connection.getOutputStream().write(postData.getBytes("UTF-8"));
            BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String line;
            StringBuilder response = new StringBuilder();
            while ((line = reader.readLine()) != null) {
                response.append(line);
            }
            reader.close();

            System.out.println(response.toString());

            connection.disconnect();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

请注意，上述代码中的`YOUR_ACCESS_TOKEN`需要替换为您实际的访问令牌，您可以通过微信开放平台的接口获取。