struts2框架实例

一，Struts2框架介绍

　　它是一个View框架，对Servle进行了封装，使用核心过滤器对servlet进行了解耦，可以自动封装数据　　核心是结果视图导航

二，程序实例

1.导入框架依赖包

2.注册框架核心过滤器，一般工具会有自动生成　　web.xml

<?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>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>

  <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>

3.编写action文件　　Demo1Action.java

package com.zhaolong.action;

import com.opensymphony.xwork2.ActionSupport;

public class Demo1Action  extends ActionSupport{

    private String message;

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    @Override
    public String execute() throws Exception {

        this.message="Hello,World!";

        return super.execute();
    }

}

4.注册action　　struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" 
　　"http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>

    <!-- 允许OGNL表达式，访问静态方法和属性 -->
    <constant name="struts.ognl.allowStaticMethodAccess" value="true"/>
    <package name="tt" namespace="/" extends="struts-default">

        <action name="*_*" class="com.zhaolong.action.{1}Action" method="{2}">
            <result name="success">/{1}.jsp</result>
        </action>

    </package>

</struts>