java代码实现企业微信机器人艾特群内成员

可以使用企业微信的API来实现机器人艾特群内成员的功能。以下是一个简单的Java代码示例：

import okhttp3.*;
import org.json.JSONArray;
import org.json.JSONObject;

import java.io.IOException;

public class ChatRobot {
    private static final String CORP_ID = "your_corp_id";
    private static final String AGENT_ID = "your_agent_id";
    private static final String SECRET = "your_secret";
    private static final String BASE_URL = "https://qyapi.weixin.qq.com/cgi-bin";

    public static void main(String[] args) throws IOException {
        // 获取access_token
        String accessToken = getAccessToken(CORP_ID, SECRET);

        // 发送消息
        String groupId = "group_id"; // 要艾特的群组ID
        String content = "@all 请注意！"; // 艾特全体成员的消息内容
        sendGroupMessage(accessToken, AGENT_ID, groupId, content);
    }

    /**
     * 获取access_token
     */
    private static String getAccessToken(String corpId, String secret) throws IOException {
        String url = BASE_URL + "/gettoken?corpid=" + corpId + "&corpsecret=" + secret;
        OkHttpClient client = new OkHttpClient();
        Request request = new Request.Builder().url(url).build();
        Response response = client.newCall(request).execute();
        if (!response.isSuccessful()) {
            throw new IOException("Unexpected code " + response);
        }
        JSONObject responseBody = new JSONObject(response.body().string());
        return responseBody.getString("access_token");
    }

    /**
     * 发送群消息，艾特全体成员
     */
    private static void sendGroupMessage(String accessToken, String agentId, String groupId, String content) throws IOException {
        String url = BASE_URL + "/message/send?access_token=" + accessToken;
        OkHttpClient client = new OkHttpClient();

        JSONObject requestBody = new JSONObject();
        requestBody.put("agentid", agentId);
        requestBody.put("msgtype", "text");
        JSONObject textContent = new JSONObject();
        textContent.put("content", content);
        requestBody.put("text", textContent);
        JSONObject mentionContent = new JSONObject();
        JSONArray mentionList = new JSONArray();
        mentionList.put("@all");
        mentionContent.put("user_list", mentionList);
        requestBody.put("mention", mentionContent);
        JSONObject chatIdContent = new JSONObject();
        chatIdContent.put("chatid", groupId);
        requestBody.put("chatid", chatIdContent);

        RequestBody body = RequestBody.create(MediaType.parse("application/json; charset=utf-8"), requestBody.toString());
        Request request = new Request.Builder().url(url).post(body).build();
        Response response = client.newCall(request).execute();
        if (!response.isSuccessful()) {
            throw new IOException("Unexpected code " + response);
        }
        JSONObject responseBody = new JSONObject(response.body().string());
        int errcode = responseBody.getInt("errcode");
        if (errcode != 0) {
            throw new IOException("Send group message failed, errcode: " + errcode);
        }
    }
}

需要注意的是，发送消息需要使用企业微信的API密钥，所以需要先在企业微信后台中创建一个应用，并获取相应的CORP_ID、AGENT_ID和SECRET。此外，还需要获取access_token，用于接口调用的身份验证。具体实现可以参考上面的代码示例。