java发送x-www-form-urlencoded

在Java中发送x-www-form-urlencoded数据，你可以使用HttpURLConnection或者HttpClient库进行实现。下面是使用HttpURLConnection的示例代码：

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

public class Main {
    public static void main(String[] args) {
        try {
            // 创建URL对象
            URL url = new URL("https://localhost:8080/poll/query.do");            
            // 创建连接
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            
            // 设置请求方法为POST
            connection.setRequestMethod("POST");
            
            // 设置请求头
            connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            
            // 开启输出流，用于向服务器发送数据
            connection.setDoOutput(true);
            
            // 构建请求参数
            String params = "customer=123&sign=123";
            
            // 发送请求参数
            OutputStream outputStream = connection.getOutputStream();
            outputStream.write(params.getBytes());
            outputStream.flush();
            outputStream.close();
            
            // 获取响应结果
            BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            StringBuilder response = new StringBuilder();
            String line;
            while ((line = reader.readLine()) != null) {
                response.append(line);
            }
            reader.close();
            
            // 输出响应结果
            System.out.println(response.toString());
            
            // 关闭连接
            connection.disconnect();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}