使用 FileWriter Java 写入已存在的文件

发布于 2024-09-04 21:06:58 字数 399 浏览 7 评论 0原文

无论如何，我是否可以使用 Filewriter 写入已经存在的文件

例如，当用户单击提交按钮时：

FileWriter writer = new FileWriter("myfile.csv");
writer.append("LastName");
writer.append(',');
writer.append("FirstName");
writer.append('/n');

writer.append(LastNameTextField.getText());
writer.append(',');
writer.append(FirstNameTextField.getText());

我希望能够将新数据写入已经存在的 myfile.csv，而不必每次都重新创建一个全新的数据

原文

Is there anyway I can write to an already existing file using Filewriter

For example when the user clicks a submit button:

FileWriter writer = new FileWriter("myfile.csv");
writer.append("LastName");
writer.append(',');
writer.append("FirstName");
writer.append('/n');

writer.append(LastNameTextField.getText());
writer.append(',');
writer.append(FirstNameTextField.getText());

I want to be able to write new data into the already existing myfile.csv without having to recreate a brand new one every time

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你げ笑在眉眼 2024-09-11 21:06:58

是的。像这样使用构造函数：

FileWriter writer = new FileWriter("myfile.csv",true);

Yeah. Use the constructor like this:

FileWriter writer = new FileWriter("myfile.csv",true);

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甲如呢乙后呢 2024-09-11 21:06:58

FileWriter

public FileWriter(File file,
                  boolean append)
           throws IOException

Constructs a FileWriter object given a File object. If the second argument is true, then bytes will be written to the end of the file rather than the beginning.

FileWriter

public FileWriter(File file,
                  boolean append)
           throws IOException

Constructs a FileWriter object given a File object. If the second argument is true, then bytes will be written to the end of the file rather than the beginning.

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