文件编写器覆盖文件而不是附加到末尾的问题 [英] Trouble with filewriter overwriting files instead of appending to the end
问题描述
好的,我在将多行写入文本文件时遇到了一些问题.
OK, I'm having some trouble writing multiple lines to a text file.
程序运行,但不会每次都使用新行
the program runs, but it won't use new lines each time
当我希望它运行 4 次时,文本文件应如下所示:
when I want it run 4 times, the text file should look like:
a
b
c
d
相反,它看起来像:
d
谁知道如何解决这个问题?所有导入均已正确导入.
who knows how to fix this problem? all imports are correctly imported.
源代码(略有编辑,假设一切都已正确定义):
source(it's been slightly edited, assume everything is properly defined):
import java.io.*;
public class Compiler {
public static void main (String args[]) throws IOException
{
//there's lots of code here
BufferedWriter outStream= new BufferedWriter(new FileWriter("output.txt"));
outStream.newLine();
outStream.write(output);
outStream.close();
}
}
推荐答案
确保在创建 FileWriter
的实例时,将其附加到它的末尾.这可以通过使用 这个特定的 FileWriter
构造函数,它需要一个额外的 boolean
作为第二个参数.这个 boolean
告诉 FileWriter
附加到文件的末尾,而不是覆盖文件.
Make sure that when you create an instance of a FileWriter
, that you are appending to the end of it. This can be done by using this specific FileWriter
constructor which takes an additional boolean
as a second parameter. This boolean
tells the FileWriter
to append to the end of the file, rather than overwriting the file.
BufferedWriter outStream= new BufferedWriter(new FileWriter("encoded.txt", true));
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