"Java Development Series"--struts2 simple Getting Started example

Objective

Recently there is time to summarize, the past knowledge of the course, although things are entry-level, the master must be dismissive, but for the first small white, still can provide a point of reference.

Struts2 actually encapsulates the servlet for us, simplifies the complex operation of JSP jumps, and provides easy-to-write tags to quickly develop the code for the view layer.

　In the past, we used JSP and servlet collocation to achieve the presentation, the general process is:

1 JSP Trigger action

2 servlet accepts action and gives background class processing

3 Background class jumps to other JSPs for data presentation

　Now with the STRUTS2, the implementation process becomes

1 JSP departure action

2 struts2 intercept request, invoke background action

3 Action Returns the result, presenting the data by different JSPs

　　

Below we look at the need for the jar package

The first two are Apache Commons jar packages, ignoring

Freemarker offers another way of showing

OGNL provides a OGNL expression

Struts2-core provides STRUTS2 core package

Xwork-core because struts2 a lot of things based on webwork, so also need this core package

We have three JSPs available

Login Interface login.jsp

1 <%@ page language= "java" contenttype= "text/html; CHARSET=GBK "2     pageencoding=" GBK "%> 3 <% @taglib prefix=" s "uri="/struts-tags "%> 4 
Login Success Interface welcome.jsp
<%@ page language= "java" contenttype= "text/html; CHARSET=GBK "    pageencoding=" GBK "%><% @taglib prefix=" s "uri="/struts-tags "%>
Login Failure Interface error.jsp
<%@ page language= "java" contenttype= "text/html; CHARSET=GBK "    pageencoding=" GBK "%><% @taglib prefix=" s "uri="/struts-tags "%>
When login.jsp triggers an action, it forwards the request to send Login.action, which is intercepted by the background and handed over to the action handler configured in Struts.xml
1 <?xml version= "1.0" encoding= "GBK"?> 2 <! DOCTYPE struts Public 3     "-//apache software foundation//dtd struts Configuration 2.1.7//en" 4     "/http Struts.apache.org/dtds/struts-2.1.7.dtd "> 5 <struts> 6     <!--specify global internationalized Resource Files---7     <constant Name= "struts.custom.i18n.resources" value= "mess"/> 8     <!--Specify the character set used for internationalized encoding--     9     <constant Name= "struts.i18n.encoding" value= "GBK"/>10     <!--all action definitions should be placed under the package-->11 <package     name= "Test" extends= "Struts-default" >12         <action name= "Login" class= "com.test.action.LoginAction" >13             <result name= "error" >/error.jsp</result>14             <result name= "Success" >/welcome.jsp</result >15         </action>16     </package>17 </struts>
The following is Loginaction code, you can see the successful landing, the program to write username into the session. To make it easier for us to use ${sessionscope.user} in welcome.jsp to get a name
1 package com.test.action; 2  3 import com.opensymphony.xwork2.ActionContext; 4 import com.opensymphony.xwork2.ActionSupport; 5  6 Public Class Loginaction extends Actionsupport {7     private string Username; 8     private string password; 9 Public     St Ring GetUserName () {One         return username;12     }13, public     void Setusername (String username) {         This.username = username;16     }17 public     String GetPassword () {         return password;20     }21     public void SetPassword (string password) {         This.password = password;24     }25-Public     String execute () Throws Exception {         getusername () equals ("Xingoo") && GetPassword () equals ("123")) {             Actioncontext.getcontext (). GetSession (). Put ("User", GetUserName ());             return success;30         }else{31             return error;32         }33     }34}
There are also two internationalized documents here,
Mess.properties
Loginpage=loginpageerrorpage=errorpagesuccpage=succpagefailtip=sorry,login Failedsucctip=welcome{0},login Successuser=usernamepass=passwordlogin=login
Mess_zh_cn.properties
Loginpage= Login Interface errorpage= failure Interface succpage= Successful interface failtip= Sorry, you can't login! Succtip= welcome, {0}, you are already logged in! user= User name pass= password login= Login
Login interface
Landing success
Login failed
From:http://www.cnblogs.com/xing901022/p/3961661.html
"Java Development Series"--struts2 simple Getting Started example