Java发送form-data请求

在Java中，您可以使用HttpURLConnection或第三方库如Apache HttpClient来发送form-data请求。以下是使用HttpURLConnection发送form-data的示例代码：

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
 
public class FormDataSender {
    public static void sendFormData(String targetUrl, String formData) throws IOException {
        // 创建URL对象
        URL url = new URL(targetUrl);
        // 打开连接
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
 
        // 设置请求方法为POST
        connection.setRequestMethod("POST");
        // 设置请求属性，表示是form-data请求
        connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW");
 
        // 发送POST请求必须设置如下两行
        connection.setDoOutput(true);
        connection.setDoInput(true);
 
        // 创建输出流并写入数据
        try (OutputStream os = connection.getOutputStream()) {
            byte[] outputInBytes = formData.getBytes("UTF-8");
            os.write(outputInBytes);
        }
 
        // 获取响应码
        int responseCode = connection.getResponseCode();
        System.out.println("Response Code: " + responseCode);
 
        // 关闭连接
        connection.disconnect();
    }
 
    public static void main(String[] args) {
        try {
            String targetUrl = "http://example.com/submit-form";
            String formData = "------WebKitFormBoundary7MA4YWxkTrZu0gW\r\n" +
                              "Content-Disposition: form-data; name=\"field1\"\r\n\r\n" +
                              "value1\