寫入文件的新行

Question

我正在嘗試向我的應用程序的日誌寫入文件。我創建了一個將行添加到行尾的方法。

public static void write2Log(String s){ 
    StringBuilder contents = new StringBuilder(); 
    File root = Environment.getExternalStorageDirectory(); 
    File logFile = new File(root, "testWrite2file.log"); 

    if (root.canWrite()){    
     try { 
      BufferedReader input = new BufferedReader(new FileReader(logFile)); 
      String line = null;        
      while ((line = input.readLine()) != null){ 
       contents.append(line); 
      // contents.append(System.getProperty("line.separator"));    
     } 
     input.close(); 
     FileWriter logWriter = new FileWriter(logFile);     
     BufferedWriter out = new BufferedWriter(logWriter); 
     out.write(contents.toString()+"\r\n"+s);////<---HERE IS MY QUESTION 
     out.close(); 
     } 

     catch (IOException e) { 
      Log.e("test", "Could not read/write file " + e.getMessage()); 
     } 
    } 
} 

一切工作正常減少新的字符行。

我已經嘗試使用：

\r\n 

System.getProperty("line.separator") 

newline() 

，但我一直讓所有在短短的一行:(

任何想法

Answer 1

試試這個

public static boolean writeLog(String user , Exception exS) { 



    boolean d = false; 

    try { 

     File root = new File("TVS_log"); 
     if (!root.exists()) { 
      root.mkdirs(); 
     } 
     String name = user + "_" + TimeReporter.getTodayAll() + "_" + "log.txt" ; 
     System.out.println(name); 
     File text = new File(root , name); 
     if (!text.exists()) { 
      text.createNewFile(); 
     } 

     String aggregate = ""; 
     for (StackTraceElement element : exS.getStackTrace()) 
     { 
      BufferedWriter writer = new BufferedWriter(new FileWriter(text)) ; 
      String message = exS.toString() + " - " + element.toString() + "\r\n" ; 
      System.out.println(exS.toString()); 
      System.out.println(element.toString()); 
      aggregate += message; 
      writer.write (aggregate); 
      writer.newLine(); 
      writer.flush(); 
      writer.close(); 
      writer = null; 
     }                 
     if(text.exists()) 
      return text.length() > 0;         
    }catch(Exception ex){ 
     ex.printStackTrace(); 
    } 
    return d; 

} 

TimeReporter類功能

public class TimeReporter { 

    public static String getTodaysDate() { 

     String d = ""; 
     final Calendar c = Calendar.getInstance(); 
     d = String.format("%02d", c.get(Calendar.YEAR))     
        + String.format("%02d", c.get(Calendar.MONTH) + 1) 
         + String.format("%02d", c.get(Calendar.DAY_OF_MONTH)); 
     return d; 
    } 

    public static String getTodaysTime() { 

     String d = ""; 
     final Calendar c = Calendar.getInstance(); 
     d =  String.format("%02d", c.get(Calendar.HOUR_OF_DAY))    
        + String.format("%02d", c.get(Calendar.MINUTE)) 
         + String.format("%02d", c.get(Calendar.SECOND)); 
     return d; 
    } 

    public static String getTodayAll() {   
     return getTodaysDate() + "_" + getTodaysTime() ; 
    } 



public static String getNow() { 
    final Calendar c = Calendar.getInstance(); 
    String ld = c.get(Calendar.YEAR) + "/" + (c.get(Calendar.MONTH) + 1) 
      + "/" + c.get(Calendar.DAY_OF_MONTH) + " " 
      + String.format("%02d", c.get(Calendar.HOUR_OF_DAY)) + ":" 
      + String.format("%02d", c.get(Calendar.MINUTE)); 
    return ld; 
} 
} 

Answer 2

試試這個：

FileWriter logWriter = new FileWriter(logFile);     
BufferedWriter out = new BufferedWriter(logWriter); 
out.write(contents.toString());////<---HERE IS THE CHANGE 
out.newLine(); 
out.write(s); 
out.close();