struts2入门Demo示例

2020-07-27 21:31:28

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本文讲述了struts2入门Demo示例。分享给大家供大家参考。具体如下：

1.新建Web Project, 名称:struts2Demo;

2.建立一个用户库struts2, 包含最少的struts2的最少的6个jar文件;
其实呢, 对于MyEclipse8以上来说, 是不必须的, 因为它直接支持struts2了.不需要另外导包.

3.用Build Path将struts2的库加进来;

4.在web.xml中加入以下配置:

<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"   xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" >  <!-- struts2的配置 -->   <filter>     <filter-name>struts2</filter-name>     <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>   </filter>   <filter-mapping>     <filter-name>struts2</filter-name>     <url-pattern>/*</url-pattern>   </filter-mapping>  <welcome-file-list>     <welcome-file>index.jsp</welcome-file>   </welcome-file-list> </web-app>

5.建立Action

package com.yenange.action; import com.opensymphony.xwork2.Action; public class LoginAction implements Action {   private String uname;  //表单中的姓名   private String upass;  //表单中的密码   //执行方法   @Override   public String execute() throws Exception {     System.out.println("姓名:"+uname);     System.out.println("密码:"+upass);     if (uname.equals("leaf") && upass.equals("leaf")) {       return "success";     }     return "error";   }   //记住, 要有get和set方法   public String getUpass() {     return upass;   }   public void setUpass(String upass) {     this.upass = upass;   }   public String getUname() {     return uname;   }   public void setUname(String uname) {     this.uname = uname;   } }

6.三个页面文件:

index.jsp：

<%@ page language="java" import="java.util.*" pageEncoding="gbk"%> <html>   <head>     <title>My JSP 'index.jsp' starting page</title>   </head>   <body>     <form action="login">       用户名:<input type="text" name="uname"><br>       密 码:<input type="text" name="upass"><br>       <input type="submit" value="登陆" />     </form>   </body> </html>

welcome.jsp：

<%@ page language="java" import="java.util.*" pageEncoding="GBK"%> <html>   <head>     <title>My JSP 'welcome.jsp' starting page</title>   </head>   <body>     welcome struts2  </body> </html>

fail.jsp：

<%@ page language="java" import="java.util.*" pageEncoding="gbk"%> <html>  <head>   <title>My JSP 'welcome.jsp' starting page</title>  </head>  <body> 出错!</body> </html>

7.配置struts.xml. (对于MyEclipse6来说, 只能从别的地方copy)

<?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>   <package name="default" namespace="/" extends="struts-default">     <action name="login" class="com.yenange.action.LoginAction">       <result name="success">/welcome.jsp</result>       <result name="error">/fail.jsp</result>     </action>   </package>   <!-- Add packages here --> </struts>

8.到此完成.可以运行一下了, 是不是很简单?

下面是取得request, session, application这些东西的方法.

package com.yenange.action; import java.util.Map; import javax.servlet.ServletContext; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession;import org.apache.struts2.ServletActionContext; import org.apache.struts2.interceptor.ServletRequestAware; import org.apache.struts2.interceptor.SessionAware; import org.apache.struts2.util.ServletContextAware; import com.opensymphony.xwork2.Action;public class LoginAction implements Action,ServletRequestAware,SessionAware,ServletContextAware {   private String uname;  //表单中的姓名   private String upass;  //表单中的密码   HttpServletRequest request;  //常用的request   Map session;  //常用的session,有不同, 但是不需要管   ServletContext application;    //常用的application   //第二种取的方法;   HttpServletRequest request2 = ServletActionContext.getRequest();   HttpServletResponse response2 = ServletActionContext.getResponse();   HttpSession session2 = request2.getSession();  @Override   public void setServletRequest(HttpServletRequest req) {     this.request=req;   }   @Override   public void setSession(Map session) {     this.session=session;   }   @Override   public void setServletContext(ServletContext application) {     this.application=application;   }   //执行方法   public String execute() throws Exception {     if (uname.equals("leaf") && upass.equals("leaf")) {       request.setAttribute("userName", uname);       return "success";     }     request.setAttribute("accessError", uname+"这个用户或密码不正确!");     return "error";   }   //记住, 要有get和set方法   public String getUpass() {     return upass;   }   public void setUpass(String upass) {     this.upass = upass;   }   public String getUname() {     return uname;   }   public void setUname(String uname) {     this.uname = uname;   } }

这些只是初步了, 后面再学习一些关于标签, 动态方法之类的东西.

希望本文所述对大家的Struts程序设计有所帮助。

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