Struts2----访问Web元素
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转自:http://blog.csdn.net/meaijojo/article/details/7537786
常用的Web元素有:request、session、application等,而我们一般使用session较多,Struts2如何访问web元素呢?这个是非常重要的内容,因为它能完成程序后台和用户的数据交互,下面以注册为例演示其过程:
1、index.jsp文件
- <%@ 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">
- <base href="<%=basePath %>"/>
- <title>Insert title here</title>
- </head>
- <body>
- <h1>演示</h1>
- <form action="user/user02!register" method="post">
- 姓名:<input type="text" name="user.name"></input>
- <br/>
- 密码:<input type="text" name="user.password"></input>
- <br/>
- <input type="submit" value="注册"/>
- </form>
- </body>
- </html>
2、struts.xml 配置
- <?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>
- <constant name="struts.devMode" value="true" />
- <package name="front" namespace="/user" extends="struts-default">
- <action name="user*" class="com.myservice.web.UserAction{1}">
- <result>/success.jsp</result>
- <result name="error">/error.jsp</result>
- </action>
- </package>
- </struts>
3、第一种(UserAction01)
- package com.myservice.web;
- import java.util.Map;
- import com.opensymphony.xwork2.ActionContext;
- import com.opensymphony.xwork2.ActionSupport;
- public class UserAction01 extends ActionSupport {
- /**
- *
- */
- private static final long serialVersionUID = 1L;
- private User user;
- private Map request;
- private Map session;
- private Map application;
- public UserAction01(){
- request = (Map)ActionContext.getContext().get("request");
- session = ActionContext.getContext().getSession();
- application = ActionContext.getContext().getApplication();
- }
- public String register(){
- request.put("name", user.getName());
- request.put("password", user.getPassword());
- return SUCCESS;
- }
- public User getUser() {
- return user;
- }
- public void setUser(User user) {
- this.user = user;
- }
- }
4、另外一种方式非常常见,也是非常著名的方式-----Ioc(控制反转)和DI(依赖注入),它需要实现3个接口如下:
UserAction02
- package com.myservice.web;
- import java.util.Map;
- import org.apache.struts2.interceptor.ApplicationAware;
- import org.apache.struts2.interceptor.RequestAware;
- import org.apache.struts2.interceptor.SessionAware;
- import com.opensymphony.xwork2.ActionSupport;
- public class UserAction02 extends ActionSupport implements RequestAware, SessionAware,ApplicationAware{
- private Map<String, Object> request;
- private Map<String, Object> session;
- private Map<String, Object> application;
- private User user;
- public User getUser() {
- return user;
- }
- public void setUser(User user) {
- this.user = user;
- }
- public String register(){
- request.put("name", user.getName());
- request.put("password", user.getPassword());
- return SUCCESS;
- }
- @Override
- public void setApplication(Map<String, Object> application) {
- // TODO Auto-generated method stub
- this.application = application;
- }
- @Override
- public void setSession(Map<String, Object> session) {
- // TODO Auto-generated method stub
- this.session = session;
- }
- @Override
- public void setRequest(Map<String, Object> request) {
- // TODO Auto-generated method stub
- this.request = request;
- }
- }
5、success.jsp将request中内容取出并显示
- <%@ page language="java" contentType="text/html; charset=UTF-8"
- pageEncoding="UTF-8"%>
- <%@taglib uri="/struts-tags" prefix="s" %>
- <!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>Insert title here</title>
- </head>
- <body>
- <h3>成功注册</h3>
- <s:property value="#request.name"/>注册成功,密码为:<s:property value="#request.password"/>
- </body>
- </html>
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