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Chapter 2 helloworld post under struts 2

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Author: User
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Main content of this chapter:

1. Download and install struts 2

2. Create a web application manually

3. Create a struts 2 application manually

4. Implement struts 2 Action

5. Configure struts 2 Action

6. Access httpsession in action

7. output the return value of action in JSP

8. Use the form tag of struts 2

9. Program internationalization preliminary

10. Preliminary data verification

This chapter uses the helloworld application of struts 2 as an example to describe how the struts 2 MVC Framework intercepts user requests, calls the business controller to process user requests, and introduces the ing between action processing results and resources,

The main functions are as follows: the user can enter a logon page, allowing the user to enter the user name and password. If the user's user name and password meet the requirements, the user can enter a welcome page. If the input is incorrect, enter a prompt page. When a user submits a form, this instance will have basic data verification.

Try to introduce JSP Technology

1. download and install the struts 2 Framework

1. Download struts 2.06 (now struts 2.0.11.1)

2,: http://Struts.apache.org/download.cgi#Struts206

3. Download Full Distrubution (full version of struts 2)

4. The structure of the decompressed file is as follows:

(1) Appa

(2) docs

(3) J4

(4) lib

(5) SRC

5. Copy unnecessary class libraries such as *. Jar under the Lib folder to the WEB-INF/lib path.

6. Edit the Web. xml configuration file (Simhei)

<? XML version = "1.0" encoding = "GBK"?>

<Web-app xmlns = "http://java.sun.com/xml/ns/j2ee"
Xmlns: xsi = "http://www.w3.org/2001/XMLSchema-instance"
Xsi: schemalocation = "http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
Version = "2.4">

<Display-Name> welcome to Tomcat </display-Name>
<Description>
Welcome to Tomcat
</Description>

<! -- Jspc servlet mappings start -->

<Servlet>
<Servlet-Name> org. Apache. jsp. index_jsp </servlet-Name>
<Servlet-class> org. Apache. jsp. index_jsp </servlet-class>
</Servlet>

<Servlet-mapping>
<Servlet-Name> org. Apache. jsp. index_jsp </servlet-Name>
<URL-pattern>/index. jsp </url-pattern>
</Servlet-mapping>

<! -- Jspc servlet mappings end -->

</Web-app>

The following is a JSP page requesting Login

The Code is as follows:

<! Doctype HTML public "-// W3C // dtd html 4.0 transitional // en">
<%... @ Page Language = "Java" contenttype = "text/html; charset = GBK" %>
<HTML>
<Head>
<Title> Form Verification </title>
</Head>
<Body>
<Form action = "login. Action" method = "Post">
<Table align = "center">
<Caption> <Tr>
<TD> User name: <input type = "text" name = "username"/> </TD>
</Tr>
<Tr>
<TD> password & nbsp code: <input type = "text" name = "password"/> </TD>
</Tr>
<Tr align = "center">
<TD colspan = "2"> <input type = "Submit" value = "Logon"/>
<Input type = "reset" value = "Refill"/> </TD>
</Tr>
</Table>
</Form>
</Body>
</Html>

Struts 2ServletIt automatically takes effect and forwards the user's request to struts 2 Action

#### Structs 2 Action intercepts all requests suffixed with action by default. Therefore, if you want to submit a form to struts 2 Action for processing, you must set the action attribute to. Action #######

Okay !! Write it first. Read books ....

 

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