基于用户登陆的struts2中action的分类详解

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;
	}

	@Override
	public 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;
	@Override
	public UserInfo getModel()
	{
		 if(model == null)
		 {
			 model = new UserInfo();
		 }
		 return model;
	}

	@Override
	public 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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