java - 文件中最后读取的行打印为空

Question

我正在尝试使用我创建的方法读取整个文本文件。文本文件的所有行都按照我想要的方式打印出来，但是文件的最后一行在打印时显示为空。

private void readFile(String Path) throws IOException{
    String text = ""; //String used in the process of reading a file

    //The file reader
    BufferedReader input = new BufferedReader(
            new FileReader(Path));

    //Creating a new string builder.
    StringBuilder stringBuilder = new StringBuilder();

    while(text != null)
    {
        //Read the next line
        text = input.readLine();

        stringBuilder.append(text); //Adds line of text into the String Builder
        stringBuilder.append(newLine); //Adds a new line using the newLine string
    } 

    //Sets the text that was created with the stringBuilder
    SetText(stringBuilder.toString());
}

所有文件都按其应有的方式 100% 打印出来，除了该方法在底部添加了一行额外的内容“null”之外，我将如何编写代码以使该行根本不会出现？

Answer 1

您可以更改此设置:

    while(text != null)
    {
        //Read the next line
        text = input.readLine();

        // ... do stuff with text, which might be null now
    }

到这个:

    while((text = input.readLine()) != null)
    {
        // ... do stuff with text
    }

或者这个:

    while(true)
    {
        //Read the next line
        text = input.readLine();
        if(text == null)
            break;

        // ... do stuff with text
    }

或者这个:

    text = input.readLine();
    while(text != null)
    {
        // ... do stuff with text

        //Read the next line
        text = input.readLine();
    }

随你喜好。