Java发送GET和POST请求

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今天发现了一个特别好的博客，详细讲解了java发送get和post请求，原文地址为:
http://www.cnblogs.com/zhuawang/archive/2012/12/08/2809380.html

GET请求

import java.io.BufferedReader;import java.io.InputStreamReader;import java.net.URL;import java.net.URLConnection;import java.util.List;import java.util.Map;public class Httpget {    public static void main(String []args){        for(int i = 0;i<10000;i++){            String s=sendGet("http://localhost:8080", "target=1&rid=2881");        }    }    public static String sendGet(String url, String param) {        String result = "";        BufferedReader in = null;        try {            String urlNameString = url + "?" + param;            URL realUrl = new URL(urlNameString);            // 打开和URL之间的连接            URLConnection connection = realUrl.openConnection();            // 设置通用的请求属性            connection.setRequestProperty("accept", "*/*");            connection.setRequestProperty("connection", "Keep-Alive");            connection.setRequestProperty("user-agent",                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");            // 建立实际的连接            connection.connect();            // 获取所有响应头字段            Map<String, List<String>> map = connection.getHeaderFields();            // 遍历所有的响应头字段            for (String key : map.keySet()) {                System.out.println(key + "--->" + map.get(key));            }            // 定义 BufferedReader输入流来读取URL的响应            in = new BufferedReader(new InputStreamReader(                    connection.getInputStream()));            String line;            while ((line = in.readLine()) != null) {                result += line;            }        } catch (Exception e) {            System.out.println("发送GET请求出现异常！" + e);            e.printStackTrace();        }        // 使用finally块来关闭输入流        finally {            try {                if (in != null) {                    in.close();                }            } catch (Exception e2) {                e2.printStackTrace();            }        }        return result;    }}

POST请求

import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.URL;import java.net.URLConnection;public class Httpget {    public static void main(String []args){        for(int i = 0;i<10000;i++){            sendPost("http://localhost:8080", "target=1&rid=2881");        }    }     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;        }    }

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