jdk 发送post请求

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package com.example.test.dh.controller;

import com.alibaba.fastjson.JSONObject;

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

/**
 * @author dou
 * @title: GetPost
 * @projectName test
 * @description: TODO
 * @date 2021/8/1114:41
 */
public class GetPost {
    /**
     * 发送post请求
     * @param url
     * @param param
     * @return
     */
    public static String post(String url, JSONObject param) throws Exception{
        StringBuffer sb = new StringBuffer();
        try {
            URL newUrl =new URL(url);
            HttpURLConnection conn = (HttpURLConnection) newUrl.openConnection();
            conn.setRequestMethod("POST");
            conn.setRequestProperty("content-type","application/json;charset=utf-8");
            conn.setDoInput(true);
            conn.setDoOutput(true);
            OutputStream out = conn.getOutputStream();
            out.write(param.toString().getBytes());
            int code = conn.getResponseCode();
            if(code == 200){
                BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
                String len;
                while((len=reader.readLine())!=null){
                    len = new String(len.getBytes(),"utf-8");
                    sb.append(len);
                }
                reader.close();
                conn.disconnect();
            }
            System.out.println("return original result:"+sb.toString());
            return sb.toString();
        }catch (Exception e){
            e.printStackTrace();
        }
        return null;
    }
}