InetAddress.getByName抛出异常的问题

[回炉重造，学习编程中。。。]

检测网络是否畅通的一段代码，怎么会有异常抛出？下面是部分代码：

writeLog("===========开始检测百度www.baidu.com======\n");
		try{
			host = InetAddress.getByName("www.baidu.com").toString();
		}catch(UnknownHostException e){
			e.printStackTrace();
		}
		try{
			status = InetAddress.getByName(host).isReachable(timeOut);  
		}catch(IOException e){
			e.printStackTrace();
		}		 
		if(status){
			writeLog("成功\n");
		}else{
			writeLog("网站访问不到，\n");
		}

结果确实输出了成功，说明ping www.baidu.com也成功了，可是会有这样的提示：
java.net.UnknownHostException: www.baidu.com/61.135.169.125
at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
at java.net.InetAddress$1.lookupAllHostAddr(Unknown Source)
at java.net.InetAddress.getAddressFromNameService(Unknown Source)
at java.net.InetAddress.getAllByName0(Unknown Source)
at java.net.InetAddress.getAllByName(Unknown Source)
at java.net.InetAddress.getAllByName(Unknown Source)
at java.net.InetAddress.getByName(Unknown Source)
at ping.ActionHandle.checkServer(PingSwtich.java:247)
at ping.ActionHandle$2.actionPerformed(PingSwtich.java:39)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$400(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

[失落夏天]

楼主不应该啊，应该是粗心吧。。 host = InetAddress.getByName("www.baidu.com").toString(); 这句话如果打印的话结果是 www.baidu.com/61.135.169.125 然后你用这个去 status = InetAddress.getByName(host).isReachable(timeOut); 当然会报异常了。。 改成 host = InetAddress.getByName("www.baidu.com").getHostName();就可以了。

[尘缘udbwcso]

status = InetAddress.getByName("www.baidu.com").isReachable(timeOut); 这样写应该就可以了 不过返回的是false,用ping可以 public boolean isReachable(int timeout) 测试是否可以达到该地址。实现尽最大努力试图到达主机，但防火墙和服务器配置可能阻塞请求，使其在某些特定的端口可以访问时处于不可到达状态。

[回炉重造，学习编程中。。。]

引用 1 楼 AA5279AA 的回复:

楼主不应该啊，应该是粗心吧。。 host = InetAddress.getByName("www.baidu.com").toString(); 这句话如果打印的话结果是 www.baidu.com/61.135.169.125 然后你用这个去 status = InetAddress.getByName(host).isReachable(timeOut); 当然会报异常了。。 改成 host = InetAddress.getByName("www.baidu.com").getHostName();就可以了。

哦，明白了，第一次接触java，是我选的方法不对，谢谢了！

[回炉重造，学习编程中。。。]

import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;


public class Test {
	public static void main(String args[]){
		String host = "www.baidu.com"; 
		int timeOut = 5000;  
		boolean status=true;
		try{
			host = InetAddress.getByName(host).getHostName();
		}catch(UnknownHostException e){
			e.printStackTrace();
		}
		try{
			System.out.println(host);
			status = InetAddress.getByName(host).isReachable(timeOut);  
		}catch(IOException e){
			e.printStackTrace();
		}		 
		if(status){
			System.out.println("成功\n");
		}else{
			System.out.println("网站访问不到，\n");
		}
	}
}

www.baidu.com 网站访问不到， 怎么访问不到，百度我访问没有问题啊，在命令行也能ping通啊。 C:\Windows\System32>ping www.baidu.com 正在 Ping www.a.shifen.com [61.135.169.105] 具有 32 字节的数据: 来自 61.135.169.105 的回复: 字节=32 时间=17ms TTL=56 来自 61.135.169.105 的回复: 字节=32 时间=17ms TTL=56 来自 61.135.169.105 的回复: 字节=32 时间=17ms TTL=56 来自 61.135.169.105 的回复: 字节=32 时间=17ms TTL=56 61.135.169.105 的 Ping 统计信息: 数据包: 已发送 = 4，已接收 = 4，丢失 = 0 (0% 丢失)， 往返行程的估计时间(以毫秒为单位): 最短 = 17ms，最长 = 17ms，平均 = 17ms host = InetAddress.getByName(host).getHostAddress(); 改成获取ip地址也不行，怎么回事？

[回炉重造，学习编程中。。。]

我把www.baidu.com换成www.163.com就没有问题，难道是百度的问题？