使用 FileWriter Java 写入已经存在的文件
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Writing to an already existing file using FileWriter Java
提问by delo
Is there anyway I can write to an already existing file using Filewriter
无论如何我可以使用 Filewriter 写入已经存在的文件
For example when the user clicks a submit button:
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());
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
我希望能够将新数据写入已经存在的 myfile.csv 中，而不必每次都重新创建一个全新的数据
回答by Geo
Yeah. Use the constructor like this:
是的。像这样使用构造函数：
FileWriter writer = new FileWriter("myfile.csv",true);
回答by Inv3r53
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.
