java - 如何在java中跨类的多个实例编辑文本文件的结尾

Question

我正在编写代码，将异常和有关异常的注释存储在文本文件中。我遇到了一个问题，每次调用 StoreErrors 类的新实例时，错误文件都会被重写，而不是将数据写入文件末尾。

public StoreErrors(Exception e){
        //increment the error number as the number of times StoreErrors
        //was intialized
       errorNum +=1;
       try{
           FileOutputStream toWriter;
           if(!errReport.exists()){
               boolean isCreated =errReport.createNewFile();
               if(isCreated){
                   System.out.println("No Error Report was found a new one "
                           + "has been created");
               }
               /*if the file is already present set append to file to true on
                * FileOutputStream
                */
               toWriter=new FileOutputStream(errReport, true);
           }else{
               toWriter=new FileOutputStream(errReport);
           }
               //OutputStreamWriter allows toLog to be writen in UTF8
               //BufferedWriter Takes characters from the OutputStreamWriter
               /*Which Writes to the file using the File errReport using
               * FileOutputStream toWriter
               */
               toLog=new BufferedWriter(new OutputStreamWriter(
                   toWriter, "UTF8"));
           /*Creates and exception object which can be used to get information
            * about the error that occured
           */
           storeException=e;
       }catch (UnsupportedEncodingException encEx){
           encEx.printStackTrace();
       }catch(IOException ioEx){
           ioEx.printStackTrace();
       }catch (Exception ex){
           ex.printStackTrace();
       }
    }

这是每次存储新错误时调用的构造函数。请告诉我使用 BufferedReader(OutputStreamWriter(FileOutputStream(File, append boolean), Encoding)) 的组合是否正确。errorNum 和 errReport 都是静态的。文件声明如下:

私有(private)静态文件 errReport=new File("err_Report.txt");

此外，在实际使用编写器写入文件时，我使用 toLog.write("string"+"\r\n") 而不是追加。问题是如何做到这样，每次调用该类时，它都会附加同一文件的末尾，为什么它会用当前代码覆盖该文件？

Answer 1

尝试移动“true”:

   toWriter=new FileOutputStream(errReport);
}else{
   toWriter=new FileOutputStream(errReport, true);