Simple construction of struts 2 Framework (Introduction)

Keywords: Java Struts xml JSP

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Simple construction of Struts (Introduction)

Process summary: (struts 2 download: https://struts.apache.org/)

(software requirements: install eclipse/myeclipse and tomcat)

  1. Guide Package: (in apps, blank case is the simplest package needed)
  2. Action class: (path: SRC > CN. Itcast. Hello (the package of the class) > class name)
  3. struts.xml: (path: SRC > struts. XML)
  4. web.xml: (configuration of core filter)
  5. Test:

    

 

 

Specific process:

  • Create a new project and select dynamic web project:

   

  

(Note: if the. jsp page cannot find the java build path problem, it will be solved later.)

  • Guide Package: the package required by the project is in the directory of struts-2.3.24-all \ struts-2.3.24 \ apps \ struts 2-blank \ WEB-INF \ Lib

To import a package into a new project:

  • Create Action class:

  • Write HelloWorld class:
 1 package cn.itcast.helloworld;
 2 
 3 public class HelloWorld {
 4 
 5     public String hello(){
 6         
 7         System.out.println("hello world!");
 8         
 9         return "success!";
10     }
11     
12 }
  • Create struts.xml

  • Add document constraint

Open DTD, copy its contents to new TXT, and rename txt to struts-2.3.dtd (as shown below)

Create a new folder dtd and place it in the project.

Open struts-2.3.dtd and copy the target link:

Open preferences in the menu bar window, as shown in the figure, and add struts-2.3.dtd

 

  • Write struts.xml
 1 <?xml version="1.0" encoding="UTF-8"?>
 2    <!DOCTYPE struts PUBLIC
 3     "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
 4     "http://struts.apache.org/dtds/struts-2.3.dtd">
 5 <struts>
 6     <package name="hello" namespace="/hello" extends="struts-default">
 7     
 8         <action name="HelloWorld" class="cn.itcast.helloworld.HelloWorld" method="hello" >
 9             <result name="success!">/index.jsp</result>
10         </action>
11     
12     </package>
13 
14 
15 </struts>
  • Write web.xml (configure core filter)
 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
 3   <display-name>struts2_day01</display-name>
 4 
 5   <!-- struts2 Core filter -->
 6   <filter>
 7       <filter-name>struts2</filter-name>
 8       <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
 9   </filter>    <!-- ctrl+shift+t  Quick check type -->
10   <filter-mapping>
11       <filter-name>struts2</filter-name>
12       <url-pattern>/*</url-pattern>
13   </filter-mapping>
14   
15   <welcome-file-list>
16     <welcome-file>index.html</welcome-file>
17     <welcome-file>index.htm</welcome-file>
18     <welcome-file>index.jsp</welcome-file>
19     <welcome-file>default.html</welcome-file>
20     <welcome-file>default.htm</welcome-file>
21     <welcome-file>default.jsp</welcome-file>
22   </welcome-file-list>
23 </web-app>
  • Write index.jsp (test)
 1 <%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
 2 <%
 3 String path = request.getContextPath();
 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
 5 %>
 6 
 7 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 8 <html>
 9   <head>
10     <base href="<%=basePath%>">
11     
12     <title>My JSP 'index.jsp' starting page</title>
13     <meta http-equiv="pragma" content="no-cache">
14     <meta http-equiv="cache-control" content="no-cache">
15     <meta http-equiv="expires" content="0">    
16     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
17     <meta http-equiv="description" content="This is my page">
18     <!--
19     <link rel="stylesheet" type="text/css" href="styles.css">
20     -->
21   </head>
22   
23   <body>
24     Hello World! <br>
25   </body>
26 </html>

  

 

 

(Note: if the. jsp page cannot find the java build path problem, right-click the project name > build path > configure build path)

Add your own version of tomcat.

 

Posted by petroz on Sun, 03 May 2020 05:07:15 -0700