Android中的GET和POST请求

package com.xuexi.getposttest;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

public class GetPostUtil {
    public static String sendGet(String url,String params)
    {
        String result="";
        BufferedReader in=null;
        String urlName=url+"?"+params;
        try {
            URL realUrl=new URL(urlName);
            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)");
            //建立实际的链接
            connection.connect();
            //获取所有响应头字段
            Map<String, List<String>> map=connection.getHeaderFields();
            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+="n"+line;
            }
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        finally
        {
            if (in!=null) {
                try {
                    in.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }

        return result;
    }
    public static String sendPost(String url,String params)
    {
        PrintWriter out=null;
        BufferedReader in=null;
        String result="";
        try {
            URL realUrl=new URL(url);
            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)");
            //发送POST请求必须设置如下两行
            connection.setDoInput(true);
            connection.setDoOutput(true);
            //获取URLConnection对象对应的输出流
            out=new PrintWriter(connection.getOutputStream());
            out.print(params);
            //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(connection.getInputStream()));
            String line;
            while((line=in.readLine())!=null)
            {
                result+="n"+line;
            }

        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        finally
        {

                try {
                    if(out!=null){
                        out.close();
                    }
                    if(in!=null)
                    {
                    in.close();
                    }
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

        }
        return result;
    }

}