Struts2 数据封装机制

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传统数据封装

使用servlet接受请求，从HttpServletRequest对象中获取提交的数据，封装成一个实体类的对象

属性驱动

数据自动获取

实例

action.LoginAction.java

package action;import com.opensymphony.xwork2.ActionSupport;public class LoginAction extends ActionSupport{private String username;private String password;@Overridepublic String execute() throws Exception {System.out.println(username);System.out.println(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;}}

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>     </head>    <body><form method="post"action="<%=path %>/LoginAction.action">name:<input type="text" name="username">password:<input type="password" name="password"><button type="submit">submit</button></form>  </body></html>

welcome.jsp

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>     </head>    <body>    welcome<br>  </body></html>

struts.xml

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd"><struts><package name="login"  extends="struts-default"><action name="LoginAction" class="action.LoginAction"><result name="success">/welcome.jsp</result></action></package></struts>

模型驱动

自动封装

bean.User.java

package bean;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;}}

action.MLoginAction.java

package action;import bean.User;import com.opensymphony.xwork2.ActionSupport;import com.opensymphony.xwork2.ModelDriven;public class MLoginAction extends ActionSupport implements ModelDriven<User>{private User user=new User();@Overridepublic String execute() throws Exception {System.out.println(user.getUsername());System.out.println(user.getPassword());return "success";}@Overridepublic User getModel() {return user;}}

strtus.xml

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd"><struts><package name="user" extends="struts-default"><action name="loginAction" class="action.MLoginAction"><result name="success">/welcome.jsp</result><interceptor-ref name="modelDriven"></interceptor-ref><interceptor-ref name="defaultStack"></interceptor-ref></action></package></struts>

struts2 标签引入

SLoginAction.java

package action;import bean.User;import com.opensymphony.xwork2.ActionSupport;public class SLoginAction extends ActionSupport {private User user;@Overridepublic String execute() throws Exception {System.out.println(user.getUsername());System.out.println(user.getPassword());return "success";}public User getUser() {return user;}public void setUser(User user) {this.user = user;}}

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf8"%><%@ taglib prefix="s" uri="/struts-tags" %><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>  </head>    <body>      <s:form method="post" namespace="/useLogin" action="SLoginAction">   username:<s:textfield name="user.username" />   password:<s:password name="user.password" />   <s:submit value="submit"/>   </s:form>  </body></html>

struts.xml

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd"><struts><constant name="struts.ui.theme" value="simple"></constant><constant name="struts.ui.templateDir" value="template"></constant><constant name="struts.ui.templateSuffix" value="ftl"></constant><package name="user" extends="struts-default"><action name="loginAction" class="action.MLoginAction"><result name="success">/welcome.jsp</result><interceptor-ref name="modelDriven"></interceptor-ref><interceptor-ref name="defaultStack"></interceptor-ref></action><action name="SLoginAction" class="action.SLoginAction"><result name="success">/welcome.jsp</result></action></package></struts>

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