java 判断网络类型 java检查网络是否连接

package com.slowlybirld.ui;

import java.io.*;
import java.net.URL;

public class 网络连接模块 
{ 
 public static void main(String[]   args) { 
 URL url = null; 
 try { 
 url = new URL( "http://baidu.com/"); 
 InputStream  in  =  url.openStream();
 System.out.println( "Internet正常 ");
 in.close(); 
 } catch (IOException  e) { 
 System.out.println( "无法连接到： Internet"); 
 } 
 } 
}
package com.slowlybirld.ui;

import java.io.*;
import java.net.URL;

public class 网络连接模块 
{ 
 public static void main(String[]   args) { 
 URL url = null; 
 try { 
 url = new URL( "http://baidu.com/"); 
 InputStream  in  =  url.openStream();
 System.out.println( "Internet正常 ");
 in.close(); 
 } catch (IOException  e) { 
 System.out.println( "无法连接到： Internet"); 
 } 
 } 
}