java不知何故，这个方法删除了我的文件内容，但没有明显的原因

Question

如果我没有错过任何东西，你应该能够运行这段代码，只需要一个跟踪。项目根文件夹中的日志文件

我不明白发生了什么。我只是声明了一些读写器，并尝试从文件中读取。我得到一个空值，文件似乎是空的。为什么

import java.io.*;


public class StubLogHandler {

    private String name = "";
    private String path = "";



    public StubLogHandler (String filePath, String fileName) {
        this.name = fileName;
        this.path = filePath;
    }



    // THIS IS THE PESCKY BUGGER
    public void testReadWrite() {
        this.fixPath();
        File file = new File (this.path+this.name);

        try (   FileReader fileReader = new FileReader(file);
                FileWriter fileWriter = new FileWriter(file);
                BufferedReader reader = new BufferedReader(fileReader);
                BufferedWriter writer = new BufferedWriter(fileWriter);) {


            System.out.println("Works, I think.");
            String line = "";

            while (line != null) {
                line = reader.readLine();
                System.out.println(line);
                // Should get a coupl'a lines, instead I get instant null
                // Before you ask, no, the file is not initially empty
            }

        } catch (FileNotFoundException fnfe) {
            System.out.println("File Not Found");
        } catch (IOException ioe) {
            System.out.println("Could not read or write to file");
        }

    }


    private void fixPath () {
        if (this.path.isEmpty())
            return;
        char lastChar = this.path.charAt(this.path.length()-1);
        if (lastChar != '\\')
            this.path += "\\";  // In case user forgets the final '\'
    }

    public String getAbsolutePath() {
        this.fixPath();
        return new File(this.path+this.name).getAbsolutePath();
    }




}


public class Start {

    public static void main (String[] args) {

        Start.testStuff();

    }

    private static void testStuff() {
        StubLogHandler log = new StubLogHandler("","trace.log");
        System.out.println(log.getPath()+log.getName());
        System.out.println(log.getAbsolutePath());
        log.testReadWrite();
    }

}

编辑

输出：

追踪。日志

D:\Personal\Java\workspace\Default\Practice\trace。日志

我觉得很管用

空的

Answer 1

创造那个作家：

    try (   FileReader fileReader = new FileReader(file);
            FileWriter fileWriter = new FileWriter(file); // here

将立即截断该文件以准备写入。e、 g

File x = new File("X");
FileWriter fw = new FileWriter(x);

将立即删除预先存在的文件X