Java并发编程实例--4.控制线程打断

Java提供了InterruptedException异常，当我们检测到线程被打断时可以抛出并在run()方法中进行捕捉。



本例中，我们将开发一个程序以实现根据文件名称在指定文件夹（包括其子目录）中搜索它。

以此来介绍如何使用InterruptedException异常。

FileSearch.java

package com.dylan.thread.ch1.c04;

import java.io.File;

/**
 * @author xusucheng
 * @create 2018-04-13
 **/
public class FileSearch implements Runnable {
    private String initPath;
    private String fileName;
    public FileSearch(String initPath, String fileName) {
        this.initPath = initPath;
        this.fileName = fileName;
    }
    @Override
    public void run() {
        File file = new File(initPath);
        if (file.isDirectory()) {
            try {
                directoryProcess(file);
            } catch (InterruptedException e) {
                System.out.printf("%s: The search has been interrupted",Thread.currentThread().getName());
            }
        }
    }

    private void directoryProcess(File file) throws
            InterruptedException {
        File list[] = file.listFiles();
        if (list != null) {
            for (int i = 0; i < list.length; i++) {
                if (list[i].isDirectory()) {
                    directoryProcess(list[i]);
                } else {
                    fileProcess(list[i]);
                }
            }
        }
        if (Thread.interrupted()) {
            throw new InterruptedException();
        }
    }

    private void fileProcess(File file) throws InterruptedException
    {
        if (file.getName().equals(fileName)) {
            System.out.printf("%s : %s\n",Thread.currentThread().
                    getName() ,file.getAbsolutePath());
        }
        if (Thread.interrupted()) {
            throw new InterruptedException();
        }
    }

}

Main.java

package com.dylan.thread.ch1.c04;

import java.util.concurrent.TimeUnit;

/**
 * @author xusucheng
 * @create 2018-04-23
 **/
public class Main {
    public static void main(String[] args) {
        FileSearch searcher=new FileSearch("C:\\","test.log");
        Thread thread=new Thread(searcher);
        thread.start();
        try {
            TimeUnit.SECONDS.sleep(10);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        thread.interrupt();
    }
}

由于C盘下文件无数，要搜索的文件通常在10s内无法完成，所以线程被打断了。

输出：

Thread-0: The search has been interrupted