Struts2_属性驱动

在jsp页面提交到action中的表单元素在action中是以对象的形式存在的,

action中的对象name必须与jsp页面中的表单元素name相同,struts框架自动为action的对象赋值.

一.普通驱动

注意:action中的对象name必须与jsp页面中的表单元素name相同,struts框架自动为action的对象赋值.

案例:

struts.xml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>

     <package name="Hello" extends="default-struts" namespace="">

         <action name="Hello" class="com.ahd.action.HelloAction">

             <result>/success.jsp</result>

         </action>

     </package>

 </struts>

jsp页面:

 <body>

     <form action="hello.action">

         用户名:<input type="text" name="username"/><br/>

         密    码:<input type="password" name="password"/><br/>

         <input type="submit" value="submit"/>

         <input type="reset" name="reset"/><br/>

     </form>

   </body>

action页面:

 package com.ahd.action;

 import com.opensymphony.xwork2.ActionSupport;

 public class HelloAction extends ActionSupport{

     private String username;

     private String password;

     @Override

     public String execute() throws Exception {

         // TODO Auto-generated method stub

         return super.execute();

     }

     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;

     }

 }

二.属性驱动

普通驱动如果是大项目表单提供过多元素action会比较乱,属性驱动就是将表单提供的元素封装到一个对象中,这个对象作为action中的属性,

在前端页面表单中需要提交的元素name统一写成对象.name

案例:

实体类User

 package com.ahd.entity;

 public class User {

     private String username;

     private String password;

     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;

     }

 }

HelloAction:

 package com.ahd.action;

 import com.ahd.entity.User;

 import com.opensymphony.xwork2.ActionSupport;

 public class HelloAction extends ActionSupport{

     private User user;

     @Override

     public String execute() throws Exception {

         // TODO Auto-generated method stub

         System.out.println(user.getUsername()+user.getPassword());

         return super.execute();

     }

     public User getUser() {

         return user;

     }

     public void setUser(User user) {

         this.user = user;

     }

 }

index.jsp:

   <body>

     <form action="hello.action">

         用户名:<input type="text" name="user.username"/><br/>

         密    码:<input type="password" name="user.password"/><br/>

         <input type="submit" value="submit"/>

         <input type="reset" name="reset"/><br/>

     </form>

   </body>

strust.xml:

 <?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="Hello" extends="default-struts" namespace="">

         <action name="Hello" class="com.ahd.action.HelloAction">

             <result>/success.jsp</result>

         </action>

     </package>

 </struts>