Spring MVC : Login App Part 1
Let's continue with Spring by trying out a new application - Login. We'll enhance this all the way. Adding on sessions and etc... for now, lets create a dummy login.
Create project as shown before. Don't forget to change the *.htm to *.do when creating a new project. Edit the dispatcher-servlet.xml to become .do. We use back the index.jsp as our login page. Create another jsp namely success.jsp in WEB-INF/jsp.
Add the following code to index.jsp. This is our login page.
<html>
<META http-equiv="Content-Type" content="text/html; charset=UTF-8">
<form id="form1" name="form1" method="post" action="">
<p>
User name :
<input type="text" name="name"/>
</p>
<p>
Password :
<input type="password" name="password" />
</p>
<p>
<input type="submit" name="Submit" value="Submit" />
</p>
</form>
</html>
Create 3 packages - Bean, Controller, Validator ( will be used in next tutorial). Under Bean package, create a java class - LoginFormBean.java. Leave it empty (empty class). Under Controller package, create a java class - LoginFormController.java. You can create this file by doing the following. Right click the project or from the file menu -> New File -> Spring Framework -> Simple Form Controller . The codes will be generated for you.
<bean id="loginForm" class="Controller.LoginFormController">
<property name="sessionForm"><value>true<value></property>
<property name="commandName"><value>login</value></property>
<property name="commandClass"><value>Bean.LoginFormBean</value></property>
<property name="formView"><value>index</value></property>
<property name="successView"><value>success</value></property>
</bean>
<bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property name="mappings">
<map>
<entry key="/index.do">
<ref bean="loginForm"/>
</entry>
</map>
</property>
</bean>
Remove the indexcontroller part. Notice that loginForm in the urlMapping bean is the same as the one above. Quoting from here.
- commandClass—the class of the object that will be used to represent the data in this form. (tht is the bean)
- commandName—the name of the command object. (bean name)
- sessionForm—if set to false, Spring uses a new bean instance (i.e. command object) per request, otherwise it will use the same bean instance for the duration of the session.
- validator—a class that implements Spring's Validator interface, used to validate data that is passed in from the form.
- formView—the JSP for the form, the user is sent here when the controller initially loads the form and when the form has been submitted with invalid data. (input)
- successView—the JSP that the user is routed to if the form submits with no validation errors. (success)
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