使用JAVA代码实现POST发送application/x-www-form-urlencoded请求 携带JSESSIONID

可以使用Java的HttpURLConnection类来实现POST发送application/x-www-form-urlencoded请求，同时携带JSESSIONID。具体代码如下：

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

public class PostRequest {
    public static void main(String[] args) throws Exception {
        String url = "http://example.com/api";
        String sessionId = "JSESSIONID=1234567890";
        String data = "param1=value1&param2=value2";

        URL obj = new URL(url);
        HttpURLConnection con = (HttpURLConnection) obj.openConnection();

        // 设置请求方法为POST
        con.setRequestMethod("POST");

        // 设置请求头部信息
        con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
        con.setRequestProperty("Cookie", sessionId);

        // 启用输出流
        con.setDoOutput(true);

        // 将参数写入请求体
        OutputStreamWriter writer = new OutputStreamWriter(con.getOutputStream());
        writer.write(data);
        writer.flush();
        writer.close();

        // 发送请求并获取响应
        int responseCode = con.getResponseCode();
        BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
        String inputLine;
        StringBuffer response = new StringBuffer();
        while ((inputLine = in.readLine()) != null) {
            response.append(inputLine);
        }
        in.close();

        // 输出响应结果
        System.out.println(response.toString());
    }
}