如何防止文件覆盖自身？

Question

我编辑了代码，你能告诉我如何在文件末尾写出每行吗？这里写的是同一行。你能帮忙吗？

private void okMouseClicked(java.awt.event.MouseEvent evt) {         
    String pass = name.getText(); 
    if (pass.equals("")){ 
     error.setText("Name of Entity should not be left blank"); 
     //JOptionPane.showMessageDialog(null,"Name of Entity should not be left blank"); 
    } 
    else{ 
     try{ 

      Formatter outfile = new Formatter(new FileOutputStream("Convert.sql", true)); 
      outfile.format("Create Database IF NOT EXISTS " + pass + ";"); 
      outfile.close(); 

     } 

     catch(FileNotFoundException fnfe){ 
      System.out.println("Not found"); 

     } 
     this.dispose(); 
    } 
} 

Answer 1

可以传递到Formatter以附加模式创造了一个FileOutputStream构造：

Formatter outfile = new Formatter(new FileOutputStream("Convert.sql", true)); 
outfile.format("Create Database IF NOT EXISTS " + pass + ";\n"); // \n to add new line 

见http://docs.oracle.com/javase/7/docs/api/java/util/Formatter.html#Formatter(java.io.OutputStream)。