我正在编写将异常和有关异常的注释存储在文本文件中的代码。而且我遇到了一个问题,每次调用我的 StoreErrors 类的新实例时,都会重写错误文件,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。请让我知道使用 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:
私有静态文件 errReport=new File("err_Report.txt");
另外,在实际使用编写器写入文件时,我使用了 toLog.write("string"+"\r\n") 而不是 append。问题是我如何做到这一点,每次我调用类时它都会附加同一个文件的末尾,为什么它会用当前代码覆盖文件?