安卓http操作方式

用惯了开发框架都开始担心自己不会写最原始的代码，

现在发个http请求，以免以后忘记了没处找。

 

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.PrintWriter;

import java.net.URL;

import java.net.URLConnection;

import java.util.List;

import java.util.Map;

 

public class HttpRequest {

   /**

    * 向指定URL发送GET方法的请求

    *

    * @param url

    *            发送请求的URL

    * @param param

    *            请求参数，请求参数应该是name1=value1&name2=value2 的形式。

    * @return URL 所代表远程资源的响应结果

    */

   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;

    }

 

   /**

    * 向指定 URL 发送POST方法的请求

    *

    * @param url

    *            发送请求的 URL

    * @param param

    *            请求参数，请求参数应该是name1=value1&name2=value2 的形式。

    * @return 所代表远程资源的响应结果

    */

   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(

                    newInputStreamReader(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;

   }   

}\

 

 

 

//测试请求方法

public static void main(String[] args) {

       //发送 GET 请求

       Strings=HttpRequest.sendGet("http://localhost:6144/Home/RequestString","key=123&v=456");

       System.out.println(s);

       

       //发送 POST 请求

       Stringsr=HttpRequest.sendPost("http://localhost:6144/Home/RequestPostString","key=123&v=456");

       System.out.println(sr);

    }