帮我写一个Java的http请求工具类，包含Post和Get请求就行了

好的，我可以为您提供一个Java的http请求工具类。以下是示例代码：

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

public class HttpUtil {
    
    /**
     * 发送HTTP GET请求
     * @param url 请求的URL地址
     * @return 响应结果
     */
    public static String sendGetRequest(String url) throws Exception {
        URL obj = new URL(url);
        HttpURLConnection con = (HttpURLConnection) obj.openConnection();
        // 设置请求方法为GET
        con.setRequestMethod("GET");
        // 发送请求
        int responseCode = con.getResponseCode();
        if (responseCode == HttpURLConnection.HTTP_OK) {
            BufferedReader in = new BufferedReader(new InputStreamReader(
                    con.getInputStream()));
            String inputLine;
            StringBuffer response = new StringBuffer();
            while ((inputLine = in.readLine()) != null) {
                response.append(inputLine);
            }
            in.close();
            return response.toString();
        } else {
            throw new Exception("HTTP GET请求失败，错误代码：" + responseCode);
        }
    }

    /**
     * 发送HTTP POST请求
     * @param url 请求的URL地址
     * @param params 请求参数，以Map<String, String>的形式传入
     * @return 响应结果
     */
    public static String sendPostRequest(String url, Map<String, String> params) throws Exception {
        URL obj = new URL(url);
        HttpURLConnection con = (HttpURLConnection) obj.openConnection();
        // 设置请求方法为POST
        con.setRequestMethod("POST");
        // 设置请求参数
        con.setDoOutput(true);
        DataOutputStream wr = new DataOutputStream(con.getOutputStream());
        wr.writeBytes(getQueryString(params));
        wr.flush();
        wr.close();
        // 发送请求
        int responseCode = con.getResponseCode();
        if (responseCode == HttpURLConnection.HTTP_OK) {
            BufferedReader in = new BufferedReader(new InputStreamReader(
                    con.getInputStream()));
            String inputLine;
            StringBuffer response = new StringBuffer();
            while ((inputLine = in.readLine()) != null) {
                response.append(inputLine);
            }
            in.close();
            return response.toString();
        } else {
            throw new Exception("HTTP POST请求失败，错误代码：" + responseCode);
        }
    }

    /**
     * 将Map<String, String>类型的请求参数转换成字符串
     */
    public static String getQueryString(Map<String, String> params) throws Exception {
        StringBuilder result = new StringBuilder();
        boolean first = true;
        for (Map.Entry<String, String> entry : params.entrySet()) {
            if (first) {
                first = false;
            } else {
                result.append("&");
            }
            result.append(URLEncoder.encode(entry.getKey(), "UTF-8"));
            result.append("=");
            result.append(URLEncoder.encode(entry.getValue(), "UTF-8"));
        }
        return result.toString();
    }
}

使用示例：

import java.util.HashMap;
import java.util.Map;

public class Test {
    public static void main(String[] args) {
        try {
            // 发送HTTP GET请求
            String response1 = HttpUtil.sendGetRequest("http://www.baidu.com");
            System.out.println("Response1: " + response1);
            // 发送HTTP POST请求
            Map<String, String> params = new HashMap<>();
            params.put("username", "admin");
            params.put("password", "admin");
            String response2 = HttpUtil.sendPostRequest("http://example.com/login", params);
            System.out.println("Response2: " + response2);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

希望能够帮到您！