Overview of Java's struts2 framework

1. Struts2 framework concept

The Struts2 framework is a lightweight MVC process framework. Lightweight means that the program does not have a lot of code and does not occupy a lot of resources during runtime. The MVC process framework means that it supports hierarchical development, controlling the process of data, where to come, where to go, how to come, and how to go; Struts2 is a web application framework based on the MVC design pattern, which is essentially equivalent to a servlet. In the MVC design pattern, Struts2 serves as a controller to establish data interaction between the model and the view.

2. Pros and cons of struts2 framework

1. Advantages

• a) The MVC model is implemented, with a clear hierarchy structure, so that programmers only need to pay attention to the implementation of business logic.
• b) Rich label library greatly improves development efficiency.
• c) Struts2 provides rich interceptor implementation
• d) Through configuration files, you can grasp the relationship between various parts of the entire system.
• e) Exception handling mechanism, you only need to configure the mapping of exceptions in the configuration file to handle the exceptions accordingly.
• f) Struts2 has high scalability. The core jar package of Struts2 consists of a struts-default.xml file, in which some default beans, resultType types, default interceptor stacks, etc. are set. All of these default settings can be changed using the configuration file, and can be changed to beans, resulttypes, etc. developed by themselves. Therefore, if users develop plug-ins, as long as they have a simple configuration, they can easily pluggable plug-ins with the Struts2 framework.
• g) The idea of ​​tangential programming is also well reflected in Strut2. The most important manifestation is the use of interceptors. Interceptors are small functional units one by one. Users can combine these interceptors into a large interceptor. This synthetic interceptor is like a separate interceptor, just configure it into an action.

2. Disadvantages

a) It is still a bit troublesome to get parameters passed from jsp in Action in Struts2. You can configure Getter and Setter methods for properties in Struts2's Action. Through the default interceptor, you can set the request parameters to these properties. If you use this method, when there are many request parameters, the Action class will be bloated by these form properties, which makes people feel very messy. There are also properties in Action that can not only be used to obtain request parameters but also output to jsp, which will be even more messy.

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