struts2.5.x环境配置

• 开发环境
  Myeclipse2017 / Tomcat8.5 / Struts2.5.12
• jar包导入

1.  commons-fileupload-1.3.3.jar  
2.  commons-io-2.4.jar  
3.  commons-lang3-3.3.6.jar  
4.  commons-logging-1.1.3.jar  
5.  freemarker-2.3.23.jar  
6.  javassist-3.20.0-GA.jar  
7.  log4j-api-2.5.jar  
8.  log4j-core-2.8.2.jar
9.  ognl-3.1.12.jar  
10. struts2-core-2.5.2.jar  

• 在web.xml中编写配置文件

    <filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>

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

• 写struts2.xml文件

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"
        "http://struts.apache.org/dtds/struts-2.5.dtd">
        
<struts>
    <package name="action" extends="struts-default">
    <!-- 
        @package        package is a unit to group action which is similar to the package in Java
                            package can be extended and overridden.
        @attribute        name          it is required for distinction.
                            extends     inherits other package
                            namespace   URL of the web project
                            abstract        an empty package
     -->
        <action name="hello" class="action.action1" >
        <!--  
        @action     action is a action that you can visit the JSP page by the action name
        @attribute        name      it is require for distinction
                            flush       Default is true.flush the write at the end of the action or not.
                            ignoreContextParams when the action is invoked ,the parameter is included.
                            var         Push the value into Value Stack
        -->
            <result name="success">/hello.jsp</result>
            <!-- 
            @result         Result is the definition of action
            @attribute  name        it has default name "dispatcher".It corresponds to the function
                                       of the JavaBean.
             -->
        </action>
    </package>
    
</struts>

• 写java类实现execute()方法

package action;

public class action1 {
    public String  execute() {
        System.out.println("action1");
        return "success";
    }
}

• 对应的jsp页面（只是简单显示而已）命名要和struts.xml中的result中的值对应，通过浏览器访问。