用Java的HttpClient写一个简单的http请求和返回

转自：http://zeusami.iteye.com/blog/1172864

Java代码  收藏代码
import java.io.BufferedReader;  
import java.io.IOException;  
import java.io.InputStream;  
import java.io.InputStreamReader;  
  
import org.apache.http.HttpEntity;  
import org.apache.http.HttpResponse;  
import org.apache.http.client.ClientProtocolException;  
import org.apache.http.client.HttpClient;  
import org.apache.http.client.methods.HttpGet;  
import org.apache.http.impl.client.DefaultHttpClient;  
  
public class TTT  
{  
  
    /** 
     * @param args 
     * @throws IOException  
     * @throws ClientProtocolException  
     */  
    public static void main(String[] args) throws ClientProtocolException, IOException  
    {  
        // 创建HttpClient实例     
        HttpClient httpclient = new DefaultHttpClient();  
        // 创建Get方法实例     
        HttpGet httpgets = new HttpGet("http://127.0.0.1/testhttp.php?username=yonghuming");    
        HttpResponse response = httpclient.execute(httpgets);    
        HttpEntity entity = response.getEntity();    
        if (entity != null) {    
            InputStream instreams = entity.getContent();    
            String str = convertStreamToString(instreams);  
            System.out.println("Do something");   
            System.out.println(str);  
            // Do not need the rest    
            httpgets.abort();    
        }  
    }  
      
    public static String convertStreamToString(InputStream is) {      
        BufferedReader reader = new BufferedReader(new InputStreamReader(is));      
        StringBuilder sb = new StringBuilder();      
       
        String line = null;      
        try {      
            while ((line = reader.readLine()) != null) {  
                sb.append(line + "\n");      
            }      
        } catch (IOException e) {      
            e.printStackTrace();      
        } finally {      
            try {      
                is.close();      
            } catch (IOException e) {      
               e.printStackTrace();      
            }      
        }      
        return sb.toString();      
    }  
  
}  
 
 
HTTP服务器的testhttp.php内容如下
Php代码  收藏代码
<?php  
if ($_GET['username'])   
{  
    $dt["username"] = $_GET['username'];  
        echo json_encode($dt);  
}  
?>