strtus2搭建步骤：
    1.拷贝所需jar到WEB工程目录下的libwKiom1ZSfV7Se9KIAACZFl9siTo902.png

    2.配置WEB.xml文件,配置过滤器Filter

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         < 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 >

    3.编写login.jsp：        

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         < form  action = "login.action"  method = "post" >
         < h1 >用户登录</ h1 >
         账号：< input  type = "text"  name = "userName" />< br />
         密码：< input  type = "password"  name = "passWord" >< br />
         < input  type = "submit"  value = "登录" />
         </ form >

     4.创建LoginAction类继承ActionSupport类,重写execute()

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package  com.liu.web.action;
import  com.opensymphony.xwork2.ActionSupport;
/**
  * 用户登录的action
  * @author Administrator
  *
  */
public  class  LoginAction  extends  ActionSupport{
     private  String userName;
     
     private  String passWord;
     
     @Override
     public  String execute()  throws  Exception {
         
         System.out.println( "账号：" +userName);
         System.out.println( "密码：" +passWord);
         
         return  "success" ;
     }
     public  String getUserName() {
         return  userName;
     }
     public  void  setUserName(String userName) {
         this .userName = userName;
     }
     public  String getPassWord() {
         return  passWord;
     }
     public  void  setPassWord(String passWord) {
         this .passWord = passWord;
     }
}

        5.拷贝struts.xml配置文件到src目录下:

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         < constant  name = "struts.enable.DynamicMethodInvocation"  value = "false"  />
         < constant  name = "struts.devMode"  value = "true"  />
         < package  name = "default"  namespace = "/"  extends = "struts-default" >
             < action  name = "login"  class = "com.liu.web.action.LoginAction" >
                 < result  name = "success" >/success.jsp</ result >
             </ action >
         </ package >