java多线程写入同一文件

转自 ：http://www.update8.com/Program/Java/19760.html

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.concurrent.ConcurrentLinkedQueue;

/**
 * 多线程下写文件
 * @author owen.huang
 *
 */

/**
 * 将要写入文件的数据存入队列中
 */
class Creater implements Runnable{
 private ConcurrentLinkedQueue<String> queue;
 private String contents;
 public Creater(){}
 public Creater(ConcurrentLinkedQueue<String> queue, String contents){
  this.queue = queue;
  this.contents = contents;
 }
 public void run() {
  try {
   Thread.sleep(100);
  } catch (InterruptedException e) {
   e.printStackTrace();
  }
  queue.add(contents);
 }
}

/**
 * 将队列中的数据写入到文件
 */
class DealFile implements Runnable{
 private FileOutputStream out;
 private ConcurrentLinkedQueue<String> queue;
 public DealFile(){}
 public DealFile(FileOutputStream out,ConcurrentLinkedQueue<String> queue){
  this.out = out;
  this.queue = queue;
 }
 public void run() {
  while(true){//循环监听
   if(!queue.isEmpty()){ 
    try {
     out.write(queue.poll().getBytes());
    } catch (IOException e) {
     e.printStackTrace();
    }
   }
   try {
    Thread.sleep(100);
   } catch (InterruptedException e) {
    e.printStackTrace();
   }
  }
 }
}

/**
 * 测试类
 */

public class TestMultipleWriteFile {
 public static void main(String[] args) throws FileNotFoundException{
  FileOutputStream out = new FileOutputStream(new File("F:"+ File.separator +"test.txt"),true);
  ConcurrentLinkedQueue<String> queue = new ConcurrentLinkedQueue<String>();
  
  for(int j=0;j<10;j++){
   new Thread(new Creater(queue,j+"--")).start();//多线程往队列中写入数据
  }
  new Thread(new DealFile(out,queue)).start();//监听线程，不断从queue中读数据写入到文件中
 }
}