1. struts2 diagram of eclipse Helios Configuration

Document directory

• Configure web. XML in WEB-INF to add struts2 framework to Web application;
• Configure struts. XML in src (eclipse will copy all files except java files under the src directory to the WEB-INF \ classes at compilation)
• Import struts core class library into WEB-INF \ Lib;

Environment of this article:

1. eclipse for javaee developer Helios

2. Struts 2.3.1.1

3. Tomcat 7.0.6

Prerequisites: tomcat configuration is complete. This document omits the tomcat configuration steps.

In fact, the configuration process of myeclipse and eclipse for javaee is similar. The only difference is:

Eclipse for javaee creates dynamic Web projec;

Myeclipse creates a web project;

 

1. Create a dynamic web project

 

2. click Next.

 

3. See the Output Folder is build \ classes, and the traditional WEB-INF \ Classes are different, but do not need to pay attention to the development;

 

4.

Configure the web. XML. To add the struts2 framework to a web application, configure struts in SRC. XML (eclipse will copy all the files except the java files under the src directory to the WEB-INF \ classes at compilation) to import the struts core class library into the WEB-INF \ Lib;

 

5. compile web. the purpose of xml configuration here is to integrate the struts2 framework into a web application. Here, a filter is configured. We can learn from the previous steps that the filter is used to complete some tasks before the servlet is executed, from the <URL-pattern>, we can see that any request will enter the scope of the struts2 framework;

<?xml version="1.0" encoding="GBK"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">  <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></web-app>

6. Compile struts. xml

<?xml version="1.0" encoding="GBK" ?><!DOCTYPE struts PUBLIC    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"    "http://struts.apache.org/dtds/struts-2.0.dtd"><struts>    </struts>

 

Write Hello World

1. Create a hello. jsp file with the content Hello struts2 !!!

2. Configure struts. xml

<struts><constant name="struts.devMode" value="true"></constant>    <package name="HelloPackage" namespace="/" extends="struts-default">    <action name="Hello">    <result>/Hello.jsp</result>    </action>    </package></struts>

3. Deploy and enter http: // localhost: 8888/strutsdemo01/hello in the browser

 

Note: in future development, you must add the following content to the <struts> element:

<Constant name = "struts. devmode" value = "true"> </constant>

This indicates that the developer mode is used to provide more prompt information when an error occurs;