写入文件：IOException：流关闭

Question

我无法弄清楚为什么我的代码出现上述错误。每次调用方法时，我都会创建一个FileWriter和BufferedWriter的新实例，但显然该流已经关闭。

public static void addSpawn(Location spawn) 
{ 
    File spawns = new File("spawns.dat"); 

    FileWriter write = null; 
    BufferedWriter out = null; 

    try 
    { 
     write = new FileWriter(spawns, true); 
     out = new BufferedWriter(write); 

     out.write(locToStr(spawn)); 
     out.newLine(); 
    } 
    catch(Exception e) 
    { 
     System.out.println("Error writing spawn file: " + e.getMessage()); 
    } 
    finally 
    { 
     if(write != null) 
     { 
      try 
      { 
       write.close(); 
      } 
      catch(Exception e) 
      { 
       e.printStackTrace(); 
      } 
     } 

     if(out != null) 
     { 
      try 
      { 
       out.close(); 
      } 
      catch(Exception e) 
      { 
       e.printStackTrace(); 
      } 
     } 
    } 
} 

任何帮助将不胜感激。

Answer 1

BufferedWriter包装目标Writer。当你close()它，它在关闭它之前试图flush底层目标Writer。

在你的代码中，你调用close()对目标FileWriter调用closeBufferedWriter。当BufferedWriter#close()试图调用FileWriter上的flush时，该FileWriter已关闭，从而引发异常。

您需要先关闭BufferedWriter。更好的是，使用try-with-resources

try (FileWriter write = new FileWriter(spawns, true); BufferedWriter out = new BufferedWriter(write);) {