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[Struts2 Study Notes] section 3 six steps required to create struts 2 HelloWorld, struts2helloworld
Address: http://blog.csdn.net/sushengmiyan/article/details/40349201
Official documents: http://struts.apache.org/release/2.3.x/docs/hello-world-using-struts-2.html
Author: sushengmiyan
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When you click a hyperlink in the Struts 2 web application or submit a form data, the input data is not transferred to another page on the server, but to a Java class you provide. these classes are called Actions. when an Action is fired, a resource is selected to display the response. generally, a resource is a webpage, a PDF file, an Excel tab, or a Java applet window.
Suppose you want to create a simple "Hello World" example to show the welcome information. after setting up the struts work environment (refer to how to create a struts 2 web application) and creating a "Hello World" example, you need to do the following four things:
In our first example, we create a new package com. susheng. struts2Maven. bean and create a MessageStore class in it. The content is as follows:
package com.susheng.struts2Maven.bean;public class MessageStore { private String message; public MessageStore() { setMessage("Hello Struts User"); } public String getMessage() { return message; } public void setMessage(String message) { this.message = message; }}
Step 2-create Action class HelloWorldAction. java
Create a package com. susheng. struts2Maven. action. Under this package, create a class HelloWorldAction. The content is as follows:
package com.susheng.struts2Maven.action;import com.opensymphony.xwork2.ActionSupport;import com.susheng.struts2Maven.bean.MessageStore;public class HelloWorldAction extends ActionSupport{ private static final long serialVersionUID = 1L; private MessageStore messageStore; public String execute() throws Exception { messageStore = new MessageStore() ; return SUCCESS; } public MessageStore getMessageStore() { return messageStore; } public void setMessageStore(MessageStore messageStore) { this.messageStore = messageStore; }}
The content is as follows:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%><%@ taglib prefix="s" uri="/struts-tags" %><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
Step 4-add Struts configuration to struts. xml
The complete content is as follows:
<?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="basicstruts2" extends="struts-default"> <action name="index"> <result>/index.jsp</result> </action> <action name="hello" class="com.susheng.struts2Maven.action.HelloWorldAction" method="execute"> <result name="success">/HelloWorld.jsp</result> </action> </package> </struts>Step 5-create a URL ActionModify index. jsp to the following:
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><%@ taglib prefix="s" uri="/struts-tags" %><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
Step 6-construct the WAR file and run the program. The war package I constructed is basic_struts.war, so my access link is http: // localhost: 8080/basic_struts/index. action. Click the helloworld link.
The second example is completed.
How struts2 works:
Struts2 HelloWorldYour project is not started.
Struts2 HelloWorldStep 1: install Tomcat 6.jdk1.6. (This is my environment and should not be necessary)
Step 2: index.html is used to jump to helloworld. action. The Code is as follows:
<! Doctype html public "-// W3C // dtd html 4.0 Transitional // EN">
<Html>
<Head>
<META HTTP-EQUIV = "Refresh" CONTENT = "0; URL = example/HelloWorld. action">
</Head>
<Body>
<P> Loading... </p>
</Body>
</Html>
Step 3: HelloWorld. jsp under the example directory. The Code is as follows:
<% @ Page contentType = "text/html; charset = UTF-8" %>
<% @ Taglib prefix = "s" uri = "/struts-tags" %>
<Html>
<Head>
<Title> <s: text name = "HelloWorld. message"/> </title>
</Head>
<Body>
<H2> <s: property value = "message"/>
<H3> ages <Ul>
<Li>
<S: url id = "url" action = "HelloWorld">
<S: param name = "request_locale"> en </s: param>
</S: url>
<S: a href = "% {url}"> English </s: a>
</Li>
<Li>
<S: url id = "url" action = "HelloWorld">
<S: param name = "request_locale"> es </s: param>
</S: url>
<S: a href = "% {url}"> Espanol </s: a>
</Li>
</Ul>
</Body>
</Html>
Step 4: example package... the remaining full text>
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