写入TXT文件，但不覆盖 [英] Write to txt file, but not overwrite

问题描述

我有一个小问题，它看似简单（我个人认为这是），但我找不到答案。但至少我不知道如何解决它。

I got a little problem, it seems simple (personally I think it is), but I couldn't find a answer. But atleast I don't know how to fix it.

我写的一些行到一个txt文件，当我按下按钮保存。
那之后，当我键入其他东西，并再次命中保存，它会覆盖我的第一线。

I write some lines to a .txt file when I hit the button Save. Then after that, when I type something else, and hit Save again, it overwrites my first lines.

不过，我想，它写在一个新行。此外，当我关闭并重新启动应用程序，并创下再次保存，它必须重新保存在新的一行文字。

But I want that it writes at a new line. Also when I close and restart the app again, and hit save again, it must save the text on a new line again.

所以基本上：如何我可以写文本到.txt文件，而不覆盖previous线。
我可以写一个文件，所以这不是问题，而只是如何不覆盖。

So basically: How can I write text to a .txt file, without overwriting previous lines. I can write to a file, so that is not the problem, but only how to NOT overwrite.

这是我的code的小的一部分：

This is the "little" part of my code:

   public void Data_save_contacts(View v) {

        Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED);

        try {

                writer_contact = new BufferedWriter(new FileWriter(root + "/Save/Contacten.txt"));
                writer_contact.write("Perceel "+str_boer_teler_nummer+" = "+str_boer_teler);
                writer_contact.newLine();   

        } catch (IOException e) {
            System.err.println(e);
        }
}

请把我的好方向。

感谢不已，Bigflow

Thanks already, Bigflow

推荐答案

您需要做的

writer_contact =新的BufferedWriter（新FileWriter的（根+/Save/Contacten.txt\",true））;

writer_contact = new BufferedWriter(new FileWriter(root + "/Save/Contacten.txt",true));

正如Java文档中说：

Just as said in java documentation:

FileWriter

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.

Parameters:
file - a File object to write to
append - if true, then bytes will be written to the end of the file rather than the beginning 

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