如何在读取文件时保持格式化

Question

我试图将.java文件读入JTextArea，无论使用何种方法读取文件，格式都不会保留。实际的代码是确定的，但评论总是搞砸了。这是我的尝试。

//Scanner: 
    //reads an input file and displays it in the text area 
     public void readFileData(File file) 
     { 
     Scanner fileScanner = null; 

     try 
     { 
      fileScanner = new Scanner(file); 
       while(fileScanner.hasNextLine()) 
       { 
        String line = fileScanner.nextLine(); 

        //output is a JTextArea 
        output.append(line + newline); 
       } 

     } 
      catch(FileNotFoundException fnfe) 
      { 
       System.err.println(fnfe.getMessage()); 
      } 
     } 


//Scanner reading the full text at once: 
    //reads an input file and displays it in the text area 
     public void readFileData(File file) 
     { 
     Scanner fileScanner = null; 

     try 
     { 
      fileScanner = new Scanner(file); 

      fileScanner.useDelimiter("\\Z"); 
      String fullText = fileScanner.next(); 

      //print to text area 
      output.append(fullText + newline); 

     } 
      catch(FileNotFoundException fnfe) 
      { 
       System.err.println(fnfe.getMessage()); 
      } 
     } 


//BufferedReader: 
    //reads an input file and displays it in the text area 
     public void readFileData(File file) 
     { 
     //Scanner fileScanner = null; 

     try 
     { 
       BufferedReader reader = new BufferedReader(new InputStreamReader(file)); 

      String line = ""; 
      while((line = reader.readLine()) != null) 
      { 
       output.append(line + newline); 
      }    
     } 

是否有反正保持格式相同？

PS - 张贴于http://www.coderanch.com/t/539685/java/java/keep-formatting-while-reading-files#2448353

猎人

Answer 1

使用JTextArea.read（...）方法。

Answer 2

这可能是由于var新行被硬编码为'\ n'或类似的东西。尝试定义换行符如下：

String newline=System.getProperty("line.separator"); 

该解决方案更是“一般”，但如果有一个JTextArea