本文為大家分享了模擬Ping操作的一個Java類，具體內容如下
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import java.io.IOException;import java.net.InetAddress;import java.net.UnknownHostException; /** * Created by QiuJU * on 2014/9/21. */public class SimplePing implements Runnable { private final Object mEndLock = new Object(); private boolean IsEnd = false; private int arrivedCount = 0; private int Count; private int TimeOut; private String Name; private int mEndCount; private String mIp = null; private float mLossRate = 1f; private float mDelay = 0; public SimplePing(String name, int count, int timeOut) { Count = mEndCount = count; TimeOut = timeOut; Name = name; for (int i = 0; i < mEndCount; i++) { Thread thread = new Thread(this); thread.setDaemon(true); thread.start(); } if (!IsEnd) { try { synchronized (mEndLock) { mEndLock.wait(); } } catch (InterruptedException e) { e.printStackTrace(); } } } private void setEnd(boolean isArrived, long delay, String ip) { synchronized (mEndLock) { Count--; if (isArrived) { arrivedCount++; mDelay = (mDelay + delay) / 2f; if (ip != null) mIp = ip; } } if (Count == 0) setEnd(); } private void setEnd() { mLossRate = (mEndCount - arrivedCount) / mEndCount; IsEnd = true; synchronized (mEndLock) { mEndLock.notifyAll(); } } @Override public void run() { long delay = 0; boolean isArrived = false; String ip = null; try { long startTime = System.currentTimeMillis(); InetAddress address = InetAddress.getByName(Name); isArrived = address.isReachable(TimeOut); delay = System.currentTimeMillis() - startTime; ip = address.getHostAddress(); } catch (UnknownHostException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } finally { setEnd(isArrived, delay, ip); } } public String getIp() { return mIp; } public float getLossRate() { return mLossRate; } public float getDelay() { return mDelay; } public boolean getIsSucceed() { return arrivedCount > 0; }} |
在類中使用的是：
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long startTime = System.currentTimeMillis(); InetAddress address = InetAddress.getByName(Name); isArrived = address.isReachable(TimeOut); delay = System.currentTimeMillis() - startTime; ip = address.getHostAddress(); |
其中的：address.isReachable(TimeOut);方法，但是這個方法有一定局限性；當是Root模式下會發送ICMP進行Ping操作，這就比較真實了；但是如果是非Root模式下則是使用的Socket進行的模擬。
之所以說是中間類，也就是因為這個原因沒有采用這個類。
以上就是本文的全部內容，希望對大家的學習有所幫助。
