Cache tags in Java caching technology

With the development of Internet applications, the rapid growth of data volume has brought a huge load to the server. In addition, factors such as unstable network delay and bandwidth limitations have made it difficult for websites with large data volumes that require high real-time performance. Caching technology has become a necessary means to improve system performance, among which cache tags are an important component of Java caching technology.

The purpose of caching technology is to place frequently accessed data in faster storage to reduce the access pressure on the database and increase the system access speed. The cache tag is a technology that dynamically adds cached data to the page.

The function of the cache tag is to mix the data that needs to be cached with the html tag of the page, pass it to the client, and then the client performs caching. Unlike server-side caching, caching tags require client-side JavaScript support to execute. Therefore, it speeds up page response, reduces system load, and promotes a better user experience.

There are two common cache tags in Java: HTML5 tags and JSP tags. HTML5 tags are the html standard for Web pages. They provide some tags and attributes related to local caching, while JSP tags are native Java tags that can programmatically add, delete and query cached data in the page.

HTML5 Tags

HTML5 defines some new tags and attributes that can be used to store data locally on the client. These tags and attributes can be used to cache web pages on the client, cache applications offline, store user preferences, etc. Commonly used cache tags and attributes in HTML5 are as follows:

1. localstorage

The localStorage object provides a way to store and retrieve key/value pair data on the client side. Use localStorage to save some simple data, such as user preferences, form data, and network requests.

2. sessionstorage

sessionStorage is similar to localStorage, both are local storage methods provided by HTML5. The difference is that sessionStorage data is only valid before the browser is closed, and the data will be cleared after closing.

3. applicationcache

applicationcache is a new caching mechanism introduced in HTML5. It allows developers to store offline versions of web applications in the browser's cache. When the web When the application is offline, data can be quickly loaded from the browser cache to improve application response speed.

JSP tag

JSP is the abbreviation of Java Server Pages. It is a scripting language that runs on the Web server. It can help developers dynamically generate HTML, XML and other documents. Compared with HTML5 tags, JSP tags provide a more powerful ability to operate cached data, and can dynamically add, delete and query cached data.

Commonly used JSP cache tags are as follows:

The tag is used to add data to a cache Add data to the location. It can specify the name of the cache location, the expiration time, and the data to be cached.

The tag is used to obtain data in a cache location. It can specify the name of the cache location, and if the cached data is out of date or the data cannot be found, the missing data can be retrieved by setting the required properties.

The tag is used to clear the data in the specified cache location. It can specify the name of the cache location or clear all cached data.

The tag is used to include a cache file, which can specify the name of the cache location when all properties are determined Afterwards, the program will obtain the information from the cache file at the specified location.

Summary

Caching technology plays an important role in improving system response speed, reducing server load, and improving user experience. The cache tag is an important part of Java cache technology, which allows developers to process cached data more carefully and quickly. HTML5 tags and JSP tags each have their own advantages and disadvantages. Choosing the appropriate caching tag according to actual needs can help us use caching technology more effectively to improve system performance.

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