Android客戶端訪問網絡工具類

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.Reader;

import java.net.HttpURLConnection;

import java.net.MalformedURLException;

import java.net.URL;

/**

連接服務器 

@author yqq_coder 
*/

public class LoginUtils {
public LoginUtils() {

// TODO Auto-generated constructor stub  

}

/**

http://10.1.17.208:8080/LoginService/LoginServlet?userName=Lihua&passWord=123456 
http://localhost:8080/?userName=Lihua&passWord=123456 
@param ip 服務器IP 
@param userName GET方式傳遞參數用戶名 
@param passWord 密碼 
@return

*/

public static String connect(String ip, String userName, String passWord) {

 String str = "http://" + ip

     + ":8080/LoginService/LoginServlet?userName="+userName+"&passWord="+passWord;  

URL url=null;

 InputStream inputStream = null;

 HttpURLConnection connection = null;

 StringBuffer sb = null;// 線程安全

 try {

 url = new URL(str);//獲得URL對象  
 try {  
     connection = (HttpURLConnection) url.openConnection();  
     connection.setConnectTimeout(3000);  
     connection.setRequestMethod("GET");//GET方式提交參數  
     connection.setDoOutput(true);//設置可以向服務器讀寫  
     connection.setDoInput(true);  
     //請求成功  
     if (connection.getResponseCode() == 200) {  
         inputStream = connection.getInputStream();  
         Reader reader = new InputStreamReader(inputStream, "UTF-8");  
         //打包成字符流  
         BufferedReader bufferedReader = new BufferedReader(reader);  
         String str1 = null;  
         sb = new StringBuffer();  
         while ((str1 = bufferedReader.readLine()) != null) {  
             sb.append(str1);  
         }  

     }  

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

} catch (MalformedURLException e) {

 e.printStackTrace();  
 //關閉流很重要  

} finally {

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

 }  
 if (connection != null) {  
     connection.disconnect();  
     connection = null;  
 }  


}

 if (sb != null) {

 return new String(sb);  

}
return "服務器異常！";


}


}  </pre>