java调用http的工具类_JAVA工具类 [ 调用HTTP 请求 ]

以下是一个示例的Java工具类，可以用于调用HTTP请求。

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

public class HttpUtil {

    /**
     * 发送HTTP GET请求
     * @param url 请求的URL
     * @return 响应结果
     * @throws Exception
     */
    public static String sendGet(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");

        // 获取响应结果
        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();
    }

    /**
     * 发送HTTP POST请求
     * @param url 请求的URL
     * @param postData POST请求的参数
     * @return 响应结果
     * @throws Exception
     */
    public static String sendPost(String url, String postData) 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POST请求的参数
        con.setDoOutput(true);
        con.getOutputStream().write(postData.getBytes("UTF-8"));
        con.getOutputStream().flush();
        con.getOutputStream().close();

        // 获取响应结果
        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();
    }
}

使用示例：

public static void main(String[] args) {
    try {
        // 发送GET请求
        String response = HttpUtil.sendGet("http://www.example.com");
        System.out.println(response);

        // 发送POST请求
        String postData = "param1=value1&param2=value2";
        response = HttpUtil.sendPost("http://www.example.com", postData);
        System.out.println(response);
    } catch (Exception e) {
        e.printStackTrace();
    }
}