java发送GET和post请求

package com.baqingshe.bjs.util;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.PrintWriter;

import java.net.URL;

import java.net.URLConnection;

import java.util.List;

import java.util.Map;

import sun.net.www.protocol.http.HttpURLConnection;

public class HttpRequest {

  public static String doGet(String url) throws Exception {

       URL localURL = new URL(url);

       URLConnection connection = localURL.openConnection();

       HttpURLConnection httpURLConnection = (HttpURLConnection)connection;

       

       httpURLConnection.setRequestProperty("Accept-Charset", "utf-8");

       httpURLConnection.setRequestProperty("Content-Type", "application/json");

       

       InputStream inputStream = null;

       InputStreamReader inputStreamReader = null;

       BufferedReader reader = null;

       StringBuffer resultBuffer = new StringBuffer();

       String tempLine = null;

       

       if (httpURLConnection.getResponseCode() >= 300) {

           throw new Exception("HTTP Request is not success, Response code is " + httpURLConnection.getResponseCode());

       }

       

       try {

           inputStream = httpURLConnection.getInputStream();

           inputStreamReader = new InputStreamReader(inputStream);

           reader = new BufferedReader(inputStreamReader);

           

           while ((tempLine = reader.readLine()) != null) {

               resultBuffer.append(tempLine);

           }

           

       } finally {

           

           if (reader != null) {

               reader.close();

           }

           

           if (inputStreamReader != null) {

               inputStreamReader.close();

           }

           

           if (inputStream != null) {

               inputStream.close();

           }

           

       }

       

       return resultBuffer.toString();

   }

   

    public static String sendPost(String url, String param) {

        PrintWriter out = null;

        BufferedReader in = null;

        String result = "";

        try {

            URL realUrl = new URL(url);

            // 打开和URL之间的连接

            URLConnection conn = realUrl.openConnection();

            // 设置通用的请求属性

            conn.setRequestProperty("accept", "*/*");

            conn.setRequestProperty("connection", "Keep-Alive");

            conn.setRequestProperty("user-agent",

                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");

            // 发送POST请求必须设置如下两行

            conn.setDoOutput(true);

            conn.setDoInput(true);

            // 获取URLConnection对象对应的输出流

            out = new PrintWriter(conn.getOutputStream());

            // 发送请求参数

            out.print(param);

            // flush输出流的缓冲

            out.flush();

            // 定义BufferedReader输入流来读取URL的响应

            in = new BufferedReader(

                    new InputStreamReader(conn.getInputStream()));

            String line;

            while ((line = in.readLine()) != null) {

                result += line;

            }

        } 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(in!=null){

                    in.close();

                }

            }

            catch(IOException ex){

                ex.printStackTrace();

            }

        }

        return result;

    }    

}