如何使用格式化程序附加到Java中的文件? [英] How to append to a file in java using formatter?

问题描述

我有一个简单的问题.我使用这段代码使用Java在文本文件中添加一些记录，但是每次运行此程序时，都会再次创建该文件.我想追加记录而不再次创建文件?

i have a simple problem. i use this code to add some records in text file using java but every time i run this program, the file is being created again. i wanna to append records without creating file again ?

   Formatter x = null;


    try{

    x = new Formatter("C:\\Users\\Hamada\\Downloads\\products.txt");

    }

    catch(Exception e)

    {

    //System.out.println("NO Database");

    }

    x.format("%d,%s,%s,%s,%d,%d,%d,%d,%d,%d,%d",id, name, type, brand, quantity, day1, month1, year1, day2, month2, year2);

    x.close();

推荐答案

您将需要将FileStream添加到Formatter，例如以下内容，并将附加项写入Formatter.

You will need to add a FileStream to the Formatter such as the following and write the appendable to the Formatter.

FileWriter f = new FileWriter("C:\\Users\\Hamada\\Downloads\\products.txt", true);
Formatter form = new Formatter(f);

在FileWriter中传递"true"参数以附加到文件，而不覆盖当前内容.

Within the FileWriter pass the "true" parameter to append to the file and not overwrite the current contents.

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