如何在文件中的特定位置写入内容 [英] how to write content in a Specific position in a File

问题描述

假设我有一个名为abhishek.txt的文件，其中包含以下行

Suppose I have a file named abhishek.txt and that contains the following line

我是，你叫什么名字。

I am , and what is your name.

现在我要写

Abhishek

Abhishek

在我之后，就像我是Abhishek，..
如何直接在此特定位置书写内容。

after "I am" like I am Abhishek, .. How to write the content in this specific position directly.

推荐答案

您无法将数据插入文件。您可以使用 RandomAccessFile 覆盖特定位置的数据。但是，插入需要更改其后的所有数据。对于你的情况，尝试这样的事情：

You can't insert data into a file. You can overwrite data at a specific location with RandomAccessFile. However an insert requires changing all of the data after it. For your case try something like this instead:

File file = new File("abhishek.txt");
Scanner scanner = new Scanner(file).useDelimiter("\n");
String line = scanner.next();
String newLine = line.substring(0, 5) + "Abhishek" + line.substring(5);
FileWriter writer = new FileWriter(file);
writer.write(newLine);
writer.close();

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