更新属性文件中的属性值而不删除其他值 [英] Updating property value in properties file without deleting other values

问题描述

的内容First.properties ：

name=elango
country=india
phone=12345

我想要更改 country 从 india 到美国。这是我的代码：

I want change country from india to america. This is my code:

import java.io.*;
public class UpdateProperty 
{
    public static void main(String args[]) throws Exception 
    {   
        FileOutputStream out = new FileOutputStream("First.properties");
        FileInputStream in = new FileInputStream("First.properties");
        Properties props = new Properties();
        props.load(in);
        in.close();
        props.setProperty("country", "america");
        props.store(out, null);
        out.close();
    } 
}

输出内容首先。属性：

country=america

其他属性将被删除。我想更新特定的属性值，而不删除其他属性。

The other properties are deleted. I want update a particular property value, without deleting the other properties.

推荐答案

关闭后打开输出流并存储属性输入流。

Open the output stream and store properties after you have closed the input stream.

FileInputStream in = new FileInputStream("First.properties");
Properties props = new Properties();
props.load(in);
in.close();

FileOutputStream out = new FileOutputStream("First.properties");
props.setProperty("country", "america");
props.store(out, null);
out.close();

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