java发送http请求工具类

好的，以下是一个简单的 Java 发送 HTTP 请求的工具类：

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

public class HttpUtil {
    // 发送 GET 请求
    public static String sendGet(String url) {
        StringBuilder result = new StringBuilder();
        try {
            URL realUrl = new URL(url);
            HttpURLConnection conn = (HttpURLConnection) realUrl.openConnection();
            conn.setRequestMethod("GET");
            conn.setConnectTimeout(5000);
            BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result.append(line);
            }
            in.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result.toString();
    }

    // 发送 POST 请求
    public static String sendPost(String url, String param) {
        StringBuilder result = new StringBuilder();
        try {
            URL realUrl = new URL(url);
            HttpURLConnection conn = (HttpURLConnection) realUrl.openConnection();
            conn.setRequestMethod("POST");
            conn.setConnectTimeout(5000);
            conn.setDoOutput(true);
            conn.getOutputStream().write(param.getBytes());
            BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result.append(line);
            }
            in.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result.toString();
    }
}

使用方法示例：

String url = "http://www.example.com/api";
String result = HttpUtil.sendGet(url);
System.out.println(result);

String param = "name=John&age=25";
result = HttpUtil.sendPost(url, param);
System.out.println(result);

注：以上代码仅供参考，实际使用时需要根据具体需求进行修改和优化。