如何删除文本文件中的特定字符串？ [英] How to delete a specific string in a text file?

问题描述

如何删除文本文件中的特定字符串？

解决方案

找到文件。
$ b

  File file = new File（/ path / to / file.txt）; 
  

创建一个临时文件（否则你必须首先读入Java内存的所有内容）。 >

  File temp = File.createTempFile（file，.txt，file.getParentFile（））; 
  

确定字符集。

  String charset =UTF-8; 
  

确定要删除的字符串。

  String delete =foo; 
  

打开文件阅读。

<$ p新的InputStreamReader（新的FileInputStream（文件），字符集））; $ p> BufferedReader reader = new BufferedReader


打开临时文件进行写入。

<$ printWriter writer = new PrintWriter（new OutputStreamWriter（new FileOutputStream（temp），charset））;

逐行读取文件

<$ （String line;（line = reader.readLine（））！= null;）{
// ...
}
code>

删除行中的字符串。

  line = line.replace（delete，）; 
  

将其写入临时文件。

  writer.println（line）; 
  

关闭读写器（最好在>



  reader.close（）; 
 writer.close（）; 
  

删除文件。



  file.delete（）; 
  

重命名临时文件。

  temp.renameTo（文件）; 
  





另请参阅：

• Java教程 - 课程：基本I / O

How can I delete a specific string in a text file?

解决方案

Locate the file.

File file = new File("/path/to/file.txt");

Create a temporary file (otherwise you've to read everything into Java's memory first).

File temp = File.createTempFile("file", ".txt", file.getParentFile());

Determine the charset.

String charset = "UTF-8";

Determine the string you'd like to delete.

String delete = "foo";

Open the file for reading.

BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(file), charset));

Open the temp file for writing.

PrintWriter writer = new PrintWriter(new OutputStreamWriter(new FileOutputStream(temp), charset));

Read the file line by line.

for (String line; (line = reader.readLine()) != null;) {
    // ...
}

Delete the string from the line.

    line = line.replace(delete, "");

Write it to temp file.

    writer.println(line);

Close the reader and writer (preferably in the finally block).

reader.close();
writer.close();

Delete the file.

file.delete();

Rename the temp file.

temp.renameTo(file);

See also:

• The Java Tutorials - Lesson: basic I/O

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