模拟HTTP请求

package com.lava.lavafaq.utils;

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 BaseHttpRequest {
    
    
    public static String get(String url) 
      {     
          String result = "";     
          BufferedReader in = null;     
          try 
          {           
              URL realUrl = new URL(url);       
              // 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 post(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; 
    }   
}