如何将新的文本行添加到Java中的现有文件？ [英] How to add a new line of text to an existing file in Java?

问题描述

我想追加一个新行到现有的文件，而不删除该文件的当前信息。总之，这里是我使用当前时间的方法：

pre $ import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.Writer;

编写器输出;
output = new BufferedWriter（new FileWriter（my_file_name））; //每次清除文件
output.append（New Line！）;
output.close（）;


上面这行代码的问题是简单地删除我现有文件的所有内容，然后添加新的行文本。

我想在文件内容末尾附加一些文本，而不会擦除或替换任何内容。

解决方案

您必须以追加模式打开文件，这可以通过使用 FileWriter（String fileName，boolean append）构造函数来实现

  output = new BufferedWriter（new FileWriter（my_file_name，true））; 
  

应该这样做：

I would like to append a new line to an existing file without erasing the current information of that file. In short, here is the methodology that I am using the current time:

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.Writer;

Writer output;
output = new BufferedWriter(new FileWriter(my_file_name));  //clears file every time
output.append("New Line!");
output.close();

The problem with the above lines is simply they are erasing all the contents of my existing file then adding the new line text.

I want to append some text at the end of the contents of a file without erasing or replacing anything.

解决方案

you have to open the file in append mode, which can be achieved by using the FileWriter(String fileName, boolean append) constructor.

output = new BufferedWriter(new FileWriter(my_file_name, true));

should do the trick

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