java - 追加一个文件，而不是覆盖它？

Question

我写入文本文件的代码现在看起来像这样:

 public void resultsToFile(String name){
    try{
    File file = new File(name + ".txt");
    if(!file.exists()){
        file.createNewFile();
    }
    FileWriter fw = new FileWriter(file.getAbsoluteFile());
    BufferedWriter bw = new BufferedWriter(fw);
    bw.write("Titel: " + name + "\n\n");
    for(int i = 0; i < nProcess; i++){
        bw.write("Proces " + (i) + ":\n");
        bw.write("cycles needed for completion\t: \t" + proc_cycle_instr[i][0] + "\n");
        bw.write("instructions completed\t\t: \t" + proc_cycle_instr[i][1] + "\n");
        bw.write("CPI: \t" + (proc_cycle_instr[i][0]/proc_cycle_instr[i][1]) + "\n");
    }
    bw.write("\n\ntotal Cycles: "+totalCycles);
    bw.close();
    }catch(IOException e){
        e.printStackTrace();
    }
}

但是，这会覆盖我以前的文本文件，而我希望将它附加到已经存在的文件中!我做错了什么？

Answer 1

FileWriter fw = new FileWriter(file.getAbsoluteFile() ,true);

通过传递 append true 以追加模式打开。

   public FileWriter(File file, boolean append)    throws IOException

Constructs a FileWriter object given a File object. If the second argument is true, then bytes will be written to the end of the file rather than the beginning.