java中可以通过调用ping命令来判断网络是否连接正常详解编程语言

   
import java.io.BufferedReader;   
import java.io.IOException;   
import java.io.InputStream;   
import java.io.InputStreamReader;   
   
/**  
 * 判断网络连接状况.  
 * @author nagsh  
 *  
 */   
public class NetState {   
   
    public boolean isConnect(){   
        boolean connect = false;   
        Runtime runtime = Runtime.getRuntime();   
        Process process;   
        try {   
            process = runtime.exec("ping " + "www.baidu.com");   
            InputStream is = process.getInputStream();    
            InputStreamReader isr = new InputStreamReader(is);    
            BufferedReader br = new BufferedReader(isr);    
            String line = null;    
            StringBuffer sb = new StringBuffer();    
            while ((line = br.readLine()) != null) {    
                sb.append(line);    
            }    
            System.out.println("返回值为:"+sb);     
            is.close();    
            isr.close();    
            br.close();    
   
            if (null != sb && !sb.toString().equals("")) {    
                String logString = "";    
                if (sb.toString().indexOf("TTL") > 0) {    
                    // 网络畅通     
                    connect = true;   
                } else {    
                    // 网络不畅通     
                    connect = false;   
                }    
            }    
        } catch (IOException e) {   
            e.printStackTrace();   
        }    
        return connect;   
    }   
       
    public static void main(String[] args) {   
        NetState netState = new NetState();   
        System.out.println(netState.isConnect());   
   
    }   
   
}