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Record ssh framework learning

1. What is Strust2? What's the use?

Struts2 is a framework for implementing MVC , based on the WebWork framework technology. The struts2 core interceptor, the core functions of the struts2 framework are all implemented by the interceptor .
Role:
strust2 can automatically realize the transmission and transmission of data requests, that is, request and response are no longer needed
Essence:
Servlet implemented by filters

2. Strust2 initialization

1. trust.xml (put in src)

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
	"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
	"http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>  
   <package name="default" namespace="/" extends="struts-default"><!-- struts-default是strust2自带的包 -->
      <action name="" class="" method="">  <!--name 相当于servlet的/aa/a--!> <!--class 相当于对那个包继续操作-->   <!--method调用改包的那个方法-->
          <result name=""></result>   <!--name 执行该方法的返回结果-->
          <result name=""></result>
     </action>
   </package>   
</struts>

2.web.xml

code show as below:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
 
 <filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>

    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    
</web-app>

Functional Structure Diagram

功能结构如下所示：
insert image description here

Getting Started Case

Requirements Analysis: Realize the summation
code of positive and negative numbers and installation and deployment

Strust2-1 Basic Principles and Getting Started Cases

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