从多个线程写入文本文件？ [英] Write to text file from multiple threads?

问题描述

我有20个线程用println（）函数写入一个名为results.txt的文件。我如何同步它们？

i have 20 threads that write with the println() function on a file called results.txt. How can i synchronize them all?

我注意到每次我的程序运行时，我在results.txt中都有不同数量的文本行。

I note every time my program run i have different number of lines of text in results.txt.

谢谢。

推荐答案

通过包含 synchronized方法写入文件。一次只能有一个线程执行该方法。

Access the file through a class that contains a synchronized method to write to the file. Only one thread at a time will be able to execute the method.

我认为Singleton模式适合您的问题：

I think that Singleton pattern would fit for your problem:

package com.test.singleton;

public class Singleton {
    private static final Singleton inst= new Singleton();

    private Singleton() {
        super();
    }

    public synchronized void writeToFile(String str) {
        // Do whatever
    }

    public Singleton getInstance() {
        return inst;
    }

}

每次需要写入你的文件，你只需要打电话：

Every time you need to write to your file, you only would have to call:

Singleton.getInstance().writeToFile("Hello!!");

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