How to modify .prop file in nodejs

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.prop file is a simple configuration file typically used to store settings and properties for an application. In Node.js, we can use the fs library to read and modify .prop files. Here is a simple guide on how to modify .prop files using Node.js.

Step 1: Install Node.js and fs module

First, you need to install Node.js. If you have not installed it yet, please refer to the official website https://nodejs.org/ to install the latest version.

In Node.js, we can use the fs module to read and modify .prop files. Please make sure you have the fs module installed. If you haven't installed the fs module yet, run the following command at the command line:

npm install fs --save

Now you are ready to start writing code.

Step 2: Read the .prop file

First, we need to read the contents of the .prop file. The following is a sample code for reading a .prop file:

const fs = require('fs');

fs.readFile('config.prop', 'utf8', function(err, data) {
  if (err) throw err;
  console.log(data);
});

The above code uses the fs.readFile function to read the config.prop file. This function accepts three parameters:

• Filename: The name of the file to be read.
• Encoding: The encoding format of the file. In this case we use utf8 encoding.
• Callback function: This function will be called when reading is completed. This function takes two parameters: the error object (if any) and the file contents.

If everything goes well, the console will output the contents of the file.

Step 3: Modify the .prop file

Now, we can start modifying the .prop file. The following is a simple sample code:

const fs = require('fs');

fs.readFile('config.prop', 'utf8', function(err, data) {
  if (err) throw err;

  // 修改属性值
  data = data.replace(/key=value/g, 'key=newvalue');

  // 写入文件
  fs.writeFile('config.prop', data, 'utf8', function(err) {
    if (err) throw err;
    console.log('文件已保存！');
  });
});

The above code reads the contents of the config.prop file and uses the replace function to replace all key=value with key=newvalue. The code then writes the modified content back to the config.prop file.

It should be noted that here we use an asynchronous method to write the file. If you need synchronous operation, use the fs.writeFileSync function.

Now, you have learned how to read and modify .prop files using Node.js. Hope this article is helpful to you.

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