java中常见的远程调用get、post请求的方法1 ：URLConnection

package test;

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 Test {
     /**
      * 向指定URL发送GET方法的请求
      *

* @param url
      *            发送请求的URL
      * @return URL 所代表远程资源的响应结果
      */
     public static
String sendGet(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 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;
     }

}