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要用java檢測網絡資源是否可用，我們可以采用以下兩種方法：
一種方法是調用ping命令，
如：
Process process= Runtime.getRuntime().exec("ping 192.168.0.5");
InputStreamReader return = new InputStreamReader(process.getInputStream());
LineNumberReader returnData = new LineNumberReader (return);

String line="";
while((line=returnData.readLine())!=null){
System.out.println(line);
}
通用對返回數據進行分析，來探測網絡資源的可用性；
這種方法有一個缺點：就是許多網絡資源是不允許被ping的，從而針對這類資源無法探測。

(2008-07-28記)

Dos中的ping 命令能很方便的檢測網絡是否為連通狀態.但是在java中,一直沒有找到好的方法檢來測網絡是否為連通狀態.無奈之余,想出了如下方法:

package com.roadway.edserver.util;

import java.awt.Toolkit;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.URL;

/**

* @Description:本類開啟一個線程檢測網絡是否連通

* @Author : 惠萬鵬

* @Time :2008-1-10

public class NetworkManagement implements Runnable {

private int htmlCodeSize;

private int sleepMillisecond;

private int sleepMillisecondWhenNetWorkUnLinked;

private boolean isSpontaneousNotice;

private static boolean networkIsLinked;

private Thread thread = new Thread(this);

private Toolkit toolkit;

private String[] urls;

public NetworkManagement() {

this.urls = new String[]{"http://www.baidu.com", "http://www.google.cn"};

this.htmlCodeSize = 50;

this.sleepMillisecond = 5000;

this.sleepMillisecondWhenNetWorkUnLinked = 10000;

this.toolkit = Toolkit.getDefaultToolkit();

thread.start();

}

public void setURLs(String[] urls) {

if (urls != null && urls.length > 0) {

this.urls = urls;

}

public void setHtmlCodeSize(int htmlCodeSize) {

if (htmlCodeSize > 0) {

this.htmlCodeSize = htmlCodeSize;

}

public void isSpontaneousNotice(boolean isSpontaneousNotice) {

this.isSpontaneousNotice = isSpontaneousNotice;

}

public void setSleepMillisecont(int sleepMillisecont) {

if (sleepMillisecont > 100) {

this.sleepMillisecond = sleepMillisecont;

}

public void setSleepMillisecondWhenNetWorkUnLinked(int sleepMillisecont) {

if (sleepMillisecont > 100) {

this.sleepMillisecondWhenNetWorkUnLinked = sleepMillisecont;

}

public static boolean IsNetWordLinking() {

return NetworkManagement.networkIsLinked;

}

public void run() {

while (true) {

try {

this.isNetWorkLinked();

if (!NetworkManagement.networkIsLinked) {

this.isPrintMessage(this.isSpontaneousNotice);

Thread.sleep(this.sleepMillisecondWhenNetWorkUnLinked);

}

System.out.println(NetworkManagement.IsNetWordLinking());

Thread.sleep(this.sleepMillisecond);

} catch (Exception e) {

}

private boolean canGetHtmlCode(String httpUrl) {

String htmlCode = "";

try {

InputStream in;

URL url = new java.net.URL(httpUrl);

HttpURLConnection connection = (HttpURLConnection) url

.openConnection();

connection = (HttpURLConnection) url.openConnection();

connection.setRequestProperty("User-Agent", "Mozilla/4.0");

connection.connect();

in = connection.getInputStream();

byte[] buffer = new byte[this.htmlCodeSize];

in.read(buffer);

htmlCode = new String(buffer);

} catch (Exception e) {

}

if (htmlCode == null || htmlCode.equals("")) {

return false;

}

return true;

}

private void isNetWorkLinked() {

boolean tempIsNetWorkLinked = false;

for (int urlsCount = 0; urlsCount < this.urls.length; urlsCount++) {

if (this.canGetHtmlCode(this.urls[urlsCount])) {

tempIsNetWorkLinked = true;

break;

}

NetworkManagement.networkIsLinked = tempIsNetWorkLinked;

}

private void isPrintMessage(boolean isPrint) {

if (isPrint) {

toolkit.beep();

StringBuffer message = new StringBuffer();

message.append("------------->");

message.append("網絡中斷, ");

message.append(this.sleepMillisecondWhenNetWorkUnLinked);

message.append(" 毫秒后再次檢測!<-------------");

System.out.println(message.toString());

}

public static void main(String[] args) {

NetworkManagement n = new NetworkManagement();

n.isSpontaneousNotice(true);

}

posted on 2007-12-07 19:27 HUIKK 閱讀(5210) 評論(0) 編輯收藏所屬分類: Java

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