Struts2入门案例

1.引入jar包

2在src包下创建一个名为struts.xml的配置文件

<?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>
   <!--  
      constant:常量
      devMoode；开发模式：true： 我在Struts。xml文件中做了修改，tomcat不需要重启
   -->
    <constant name="struts.devMode" value="true" />

    <package name="default" namespace="/" extends="struts-default">
        <action name="loginAction" class="cn.happy.action.LoginAction">
            <result name="success">/login/success.jsp</result>
             <result name="login">/login/login.jsp</result>
        </action>
    </package>


</struts>

3.建立一个HelloWorldAction类  并实现Action接口，在其中定义一个User 类型的user存储的是实体类中的 username 以及password  并封装

package cn.happy.action;

import cn.happy.entity.User;

import com.opensymphony.xwork2.Action;

public class HelloWordAction implements Action{

    private User user;
    public String execute() throws Exception {
        
        return "success";
    }
    
    public User getUser() {
        return user;
    }

    public void setUser(User user) {
        this.user = user;
    }
    

}

4.配置web.xml配置文件并编写filter过滤器

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
    xmlns="http://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <display-name></display-name>    
  
    <filter> 
    <filter-name>struts2</filter-name> 
    <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> 
                          //可以使用Ctrl+shift+T寻找
  </filter>
   
  <filter-mapping> 
    <filter-name>struts2</filter-name> 
    <url-pattern>/*</url-pattern> 
  </filter-mapping> 
  
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

5.index.jsp页面:

并引用 taglib指令<%@taglib uri="/struts-tags" prefix="s" %>

注：form表单的action属性名应该和struts.xml的action一致

<div>
    <h1>
    <s:property value="name"/>
   
    </h1>
    </div>
    
    <div>
    <form action="HelloWordAction" method="post">
    请输入你的姓名:
    <input name="name" type="text"><br/><br/>
    <input type="submit" value="提交">
    
    </form>
    </div>