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;

     }    

 }