Java study Note 10: Get POST data and simple template output

Get POST Data
This section will continue with Java Study Notes 09.

Generally, during development, we need to obtain the data submitted in the form, so we must first create a say. jsp. The content of this jsp is a very simple form. It is submitted in POST mode and submitted to the/hello/show/path.
[Java]
<Form action = '/hello/show/' method = "post">
<Input name = "username" type = "text"/>
<Input name = "password" type = "text"/>
<Input name = "" type = "submit"/>
</Form>
Then we need a controller file, two actions, one is the real say. jsp static page, and the other is to receive and process the data submitted by POST.
The sya () method displays static pages, and the show () method processes POST data.
The show method has two parameters. The User user object Spring will automatically fill the POST data to the User class. Modelmodel is mainly used to transmit data between the Controller and the template.
[Java]
Package com. mvc. rest;
 
Import org. springframework. stereotype. Controller;
Import org. springframework. ui. Model;
Import org. springframework. web. bind. annotation. RequestMapping;
 
// @ Controller is an annotation label that identifies the Controller class. This annotation is required for Controller classes.
@ Controller
// @ RequestMapping (value = "/hello") will be mapped to url/hello/, then access the Action in HelloController
@ RequestMapping (value = "/hello ")
Public class HelloController {

// @ RequestMapping (value = "/say") is mapped to url/hello/say, and then the Action in HelloController is accessed.
@ RequestMapping (value = "/say ")
Public void say (){
System. out. print ("this is HelloController And say Action \ r \ n ");
}

@ RequestMapping ("/show ")
Public String show (User user, Model model ){
System. out. print (user. getUsername ());
System. out. print (user. getPassword ());
Model. addAttribute ("user", user );
Return "hello/show ";
}
}
User class:
[Java]
Package com. mvc. rest;
 
Public class User {
Private String username;

Private String password;
 
Public String getUsername (){
Return username;
}
 
Public void setUsername (String username ){
This. username = username;
}
 
Public String getPassword (){
Return password;
}
 
Public void setPassword (String password ){
This. password = password;
}

 
}
The show. jsp template class outputs the received POST data:

[Java]
User: $ {user. username} <br/>
Password: $ {user. password}

Bean. xml configuration:
[Html]
<? Xml version = "1.0" encoding = "UTF-8"?>
<Beans
Xmlns = "http://www.springframework.org/schema/beans"
Xmlns: xsi = "http://www.w3.org/2001/XMLSchema-instance"
Xmlns: context = "http://www.springframework.org/schema/context"
Xmlns: aop = "http://www.springframework.org/schema/aop"
Xsi: schemaLocation = "http://www.springframework.org/schema/beans
Http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
Http://www.springframework.org/schema/context
Http://www.springframework.org/schema/context/spring-context-2.5.xsd
Http://www.springframework.org/schema/aop
Http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
">
<Context: annotation-config/>
<Aop: aspectj-autoproxy/> www.2cto.com
<Bean id = "User" class = "com. mvc. rest. User"> </bean>
</Beans>