基于用户登陆的struts2中action的分类详解

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在struts2中action的分类有:继承 ActionSupport 实现 Action,模型驱动(ModelDriven)的 Action,多方法的 Action三种方式。


1、继承 ActionSupport 实现 Action

通过继承 ActionSupport 来实现 Action 是我们的推荐做法,因为 ActionSupport 中提供了输入验证、国际化、execute 等常用方法,使得编写 Action 时代码很简单。

1.1 UserAction.java

package com.lzugis.action;import com.opensymphony.xwork2.ActionSupport;public class UserAction extends ActionSupport {/** *  */private static final long serialVersionUID = 1L;private String username;private String userpass;public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getUserpass() {return userpass;}public void setUserpass(String userpass) {this.userpass = userpass;}@Overridepublic String execute() throws Exception {if (username.equals("admin") && userpass.equals("admin")){return "success";}else{return "error";}}}

1.2 struts.xml

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE struts PUBLIC"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN""http://struts.apache.org/dtds/struts-2.0.dtd"><struts><!--  定义包管理配置的action  继承struts-default.xml中的配置  --><package name="action" extends="struts-default"><!--  定义Action(login.action)  --><action name="login" class="com.lzugis.action.UserAction"><!--  定义转发路径对应的字符串名  --><result name="success">/Success.jsp</result><result name="error">/Error.jsp</result></action> </package></struts>

1.3 userlogin.jsp

<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>    <%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>用户登录</title></head><body style="font-family:Times New Roman"><form action="login.action" method="post">用户名:<!--  参数名和action中的属性名一样  --><input type="text" name="username"><br>密  码:<input type="password" name="userpass"><br><input type="submit" name="subm" value="提交"><input type="reset" name="reset" value="取消"></form></body></html>

1.4 action响应结果

1.4.1 Success.jsp

<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%><%@ taglib uri="/struts-tags" prefix="s"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>登录成功</title></head><body><h1>欢迎<s:property value="username" />,登录</h1></body></html>

1.4.2  Error.jsp

<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>登陆错误</title></head><body><h1>用户名或者密码错误</h1></body></html>


2、模型驱动(ModelDriven)的 Action

Struts2 的 Action 属于 MVC 模型层, Action 中的方法代表业务逻辑, Action 中的属性代表请求中的参数,当页面请求参数较多的时候,把过多的参数对象的属性定义在 Action 中不太符合 Struts 所倡导的松耦合原则,所以我们推荐单独用 JavaBean 来封装参数,在 Action中为 JavaBean 赋值,这就是 ModelDriven 的 Action。模型驱动的 Action 要求 Action 实现ModelDriven 接口,假如登录页面需要传输参数 username 和 userpass,我们把这 2 个参数封装在一个数据的 JavaBean 中,然后在 Action 中定义该 JavaBean 为 Model 即可。

2.1 UserInfo.java

package com.lzugis.javabean;public class UserInfo {private String username,userpass;public String getUsername(){return username;}public void setUsername(String username){this.username=username;}public String getUserpass(){return userpass;}public void setUserpass(String userpass){this.userpass=userpass;}}

2.2 UserinfoAction.java

package com.lzugis.action;import com.lzugis.javabean.UserInfo;import com.opensymphony.xwork2.ActionSupport;import com.opensymphony.xwork2.ModelDriven;public class UserinfoAction extends ActionSupport  implements  ModelDriven<UserInfo>{/** *  */private static final long serialVersionUID = 1L;private UserInfo model;@Overridepublic UserInfo getModel() { if(model == null) { model = new UserInfo();        } return model;}@Overridepublic String execute() throws Exception {if (model.getUsername().equals("admin") && model.getUserpass().equals("admin")){return "success";}else{return "error";}}}

2.3 struts.xml

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE struts PUBLIC"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN""http://struts.apache.org/dtds/struts-2.0.dtd"><struts><!--  定义包管理配置的action  继承struts-default.xml中的配置  --><package name="action" extends="struts-default"><!--  定义Action(user.action)  --><action name="user" class="com.lzugis.action.UserinfoAction"><!--  定义转发路径对应的字符串名  --><result name="success">/Success.jsp</result><result name="error">/Error.jsp</result></action> </package></struts>

2.4 user.jsp

<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>    <%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>用户登录</title></head><body style="font-family:Times New Roman"><form action="user.action" method="post">用户名:<!--  参数名和action中的属性名一样  --><input type="text" name="model.username"><br>密  码:<input type="password" name="model.userpass"><br><input type="submit" name="subm" value="提交"><input type="reset" name="reset" value="取消"></form></body></html>

2.5 action结果

与1相同,在此不在赘述。

本实例通过struts中action的两种不同方式,实现了用户登陆的验证。相比较继承ActionSupport实现action,模型驱动的action比较方便。继承ActionSupport实现action,如果实体类的属性非常多,那么Action中也要定义相同的属性,这样显得比较繁琐。

例子源码:http://download.csdn.net/detail/gisshixisheng/6921547

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