Home > Java > javaTutorial > Basic usage: Properties in JAVA

Basic usage: Properties in JAVA

WBOY
Release: 2024-02-18 13:22:05
Original
639 people have browsed it

Basic usage: Properties in JAVA

Basic usage of properties in JAVA

In JAVA development, Properties is a tool class for storing configuration information. It provides a way to convert configuration information into key values. The way to store and access the (key-value) form.

The Properties class inherits from the Hashtable class and only allows keys and values ​​to be string types, and the storage of key-value pairs is unordered.

The Properties class is often used to store application configuration information, such as database connection information, log levels, system properties, etc. In this article, we will introduce the basic usage of the Properties class in detail, with specific code examples.

  1. Create Properties object
    Creating a Properties object is very simple, just call its no-argument constructor.
Properties properties = new Properties();
Copy after login
  1. Add key-value pairs
    You can use the setProperty() method to add key-value pairs to the Properties object. An example is as follows:
properties.setProperty("db.username", "root");
properties.setProperty("db.password", "123456");
Copy after login
  1. Get the value of the key-value pair
    You can use the getProperty() method to get the corresponding value based on the key. If the key does not exist, the getProperty() method will return null.
String username = properties.getProperty("db.username");
String password = properties.getProperty("db.password");
Copy after login
  1. Loading configuration information from a file
    The Properties class also provides a load() method to load configuration information from a file. An example is as follows:
FileInputStream fis = new FileInputStream("config.properties");
properties.load(fis);
fis.close();
Copy after login

The above code will open the file named "config.properties" and load the key-value pairs into the Properties object.

  1. Save configuration information to a file
    You can use the store() method to save the key-value pairs in the Properties object to a file. An example is as follows:
FileOutputStream fos = new FileOutputStream("config.properties");
properties.store(fos, "This is a config file");
fos.close();
Copy after login

The above code will save the key-value pairs in the Properties object to a file named "config.properties" and add a comment "This is a config file" at the beginning of the file ".

Summary
Through the above code examples, we can see the basic usage of the Properties class in JAVA. It provides a convenient way to store and access configuration information, making our applications more flexible and easier to maintain.

It should be noted that the Properties class may cause garbled characters when processing Chinese characters. To solve this problem, you can use UTF-8 encoding for processing, or use the load() and store() methods with encoding parameters.

In addition, we must also pay attention to exception handling when using the Properties class, such as exception handling such as file non-existence.

To sum up, this article introduces the basic usage of the Properties class in JAVA and comes with specific code examples. I hope it will be helpful for you to use the Properties class during the development process.

The above is the detailed content of Basic usage: Properties in JAVA. For more information, please follow other related articles on the PHP Chinese website!

Related labels:
source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template