由于没有已经给出，我加入我的

package org.gradle;

import java.io.File;

import java.io.FileDescriptor;

import java.io.FileOutputStream;

import java.io.IOException;

import java.util.concurrent.Executors;

import java.util.concurrent.ScheduledExecutorService;

import java.util.concurrent.TimeUnit;

public class FileDescriptorDemoOne {

static int index_count;

public static void main(String[] args) throws IOException {

ScheduledExecutorService exec = Executors.newSingleThreadScheduledExecutor();

exec.scheduleAtFixedRate(new Runnable() {

public void run() {

index_count++;

// do stuff

File file = new File("/tmp/helloworld.txt");

FileDescriptor fd;

FileOutputStream fos1;

try {

fos1 = new FileOutputStream(file);

fd = fos1.getFD();

//passing FileDescriptor to another FileOutputStream

FileOutputStream fos2 = new FileOutputStream(fd);

fos2.write(index_count++);

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}, 0, 5, TimeUnit.SECONDS);

}

}

显然上面的代码会泄漏文件描述符每隔几秒钟。

为了赶上这个运用

lsof的| grep的HelloWorld的

java 6015 vic 8w REG 1,4 12 86076888 /private/tmp/helloworld.txt

java 6015 vic 9w REG 1,4 12 86076888 /private/tmp/helloworld.txt

java 6015 vic 10w REG 1,4 12 86076888 /private/tmp/helloworld.txt