对接企业微信的java代码案例

以下是一个使用Java代码对接企业微信的示例：

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import okhttp3.*;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

public class WeChatApi {

    private static final MediaType JSON_MEDIA_TYPE = MediaType.parse("application/json; charset=utf-8");

    private String corpId;
    private String secret;
    private String agentId;
    private String accessTokenUrl;
    private String sendMessageUrl;

    private OkHttpClient httpClient;

    public WeChatApi(String corpId, String secret, String agentId) {
        this.corpId = corpId;
        this.secret = secret;
        this.agentId = agentId;

        this.accessTokenUrl = "https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid=" + corpId + "&corpsecret=" + secret;
        this.sendMessageUrl = "https://qyapi.weixin.qq.com/cgi-bin/message/send?access_token=";

        this.httpClient = new OkHttpClient();
    }

    public String getAccessToken() throws IOException {
        Request request = new Request.Builder().url(accessTokenUrl).build();
        Response response = httpClient.newCall(request).execute();
        if (response.isSuccessful()) {
            String responseBody = response.body().string();
            JSONObject jsonObject = JSON.parseObject(responseBody);
            return jsonObject.getString("access_token");
        } else {
            throw new IOException("Failed to get access token: " + response.message());
        }
    }

    public void sendMessage(String message) throws IOException {
        String accessToken = getAccessToken();
        String url = sendMessageUrl + accessToken;

        Map<String, Object> requestMap = new HashMap<>();
        requestMap.put("touser", "@all");
        requestMap.put("msgtype", "text");
        Map<String, String> contentMap = new HashMap<>();
        contentMap.put("content", message);
        requestMap.put("text", contentMap);
        requestMap.put("agentid", agentId);

        RequestBody requestBody = RequestBody.create(JSON_MEDIA_TYPE, JSON.toJSONString(requestMap));
        Request request = new Request.Builder().url(url).post(requestBody).build();
        Response response = httpClient.newCall(request).execute();
        if (!response.isSuccessful()) {
            throw new IOException("Failed to send message: " + response.message());
        }
    }
}

使用示例：

WeChatApi api = new WeChatApi("YOUR_CORP_ID", "YOUR_SECRET", "YOUR_AGENT_ID");
api.sendMessage("Hello, World!");