发送HTTP POST请求工具类

Love The Way You Lie 2024-02-18 22:12 49阅读 0赞

package com.example.demo;
    
    import java.io.*;
    import java.net.HttpURLConnection;
    import java.net.URL;
    
    public class HttpUtilTest {
    
        /**
         * @作用 使用urlconnection
         * @param url
         * @param Params
         * @return
         * @throws IOException
         */
        public static  String sendPost(String url,String Params)throws IOException{
            OutputStreamWriter out = null;
            BufferedReader reader = null;
            String response="";
            try {
                URL httpUrl = null; //HTTP URL类 用这个类来创建连接
                //创建URL
                httpUrl = new URL(url);
                //建立连接
                HttpURLConnection conn = (HttpURLConnection) httpUrl.openConnection();
                conn.setRequestMethod("POST");
                conn.setRequestProperty("Content-Type", "application/json");
                conn.setRequestProperty("connection", "keep-alive");
                conn.setUseCaches(false);//设置不要缓存
                conn.setInstanceFollowRedirects(true);
                conn.setDoOutput(true);
                conn.setDoInput(true);
                conn.connect();
                //POST请求
                out = new OutputStreamWriter(
                        conn.getOutputStream());
                out.write(Params);
                out.flush();
                //读取响应
                reader = new BufferedReader(new InputStreamReader(
                        conn.getInputStream()));
                String lines;
                while ((lines = reader.readLine()) != null) {
                    lines = new String(lines.getBytes(), "utf-8");
                    response+=lines;
                }
                reader.close();
                // 断开连接
                conn.disconnect();
    
            } catch (Exception e) {
                System.out.println("发送 POST 请求出现异常！"+e);
                e.printStackTrace();
            }
            //使用finally块来关闭输出流、输入流
            finally{
                try{
                    if(out!=null){
                        out.close();
                    }
                    if(reader!=null){
                        reader.close();
                    }
                }
                catch(IOException ex){
                    ex.printStackTrace();
                }
            }
    
            return response;
        }
    }