Working with Forms
First of all, write a form
<%@ Page Language="Java"ContentType="text/html; charset=iso-8859-1"pageencoding="iso-8859-1"%><!DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" "Http://www.w3.org/TR/html4/loose.dtd "><HTML><Head><Metahttp-equiv= "Content-type"content= "text/html; charset=iso-8859-1"><title>Insert Title here</title></Head><Body><H1>Register</H1><formMethod= "POST">First Name:<inputtype= "text"name= "FirstName"/><BR/>Last Name:<inputtype= "text"name= "LastName"/><BR/>UserName:<inputtype= "text"name= "UserName"/>Password:<inputtype= "text"name= "Password"/><inputtype= "Submit"value= "Register"/></form></Body></HTML>
Note that the form tag here does not set the Action property, in which case when the form commits he submits to the same URL path as the presentation, that is, it is submitted to/spitter/register. So we add a register method to the controller that handles the POST request
Second, then write the corresponding controller
Importorg.springframework.beans.factory.annotation.Autowired;ImportOrg.springframework.stereotype.Controller;ImportOrg.springframework.ui.Model;Importorg.springframework.web.bind.annotation.PathVariable;Importorg.springframework.web.bind.annotation.RequestMapping;ImportOrg.springframework.web.bind.annotation.RequestMethod;Importdata. Repository;Importentity. Spittle, @Controller @requestmapping ("/spitter") Public classSpittercontroller {PrivateRepository Repository; @Autowired PublicSpittercontroller (Repository Repository) { This. Repository =repository; } @RequestMapping (Value= "/register", method=requestmethod.get) PublicString Showregistrationform () {return"Registerform"; } @RequestMapping (Value= "/register", method=requestmethod.post) PublicString processregistration (spittle spittle) {repository.save (spittle); return"redirect:/spitter/" +Spittle.getusername (); } @RequestMapping (Value= "/{username}", method=requestmethod.get) Publicstring Redirectpage (@PathVariable string userName, model model) {SYSTEM.OUT.PRINTLN ("6666666666666"); Spittle spittle=Repository.findbyusername (userName); Model.addattribute (spittle); return"Profile"; }}
profile.jsp page
<%@ Page Language="Java"ContentType="text/html; charset=iso-8859-1"pageencoding="iso-8859-1"%> <%@ taglib Prefix="C"URI="Http://java.sun.com/jsp/jstl/core" %><!DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" "Http://www.w3.org/TR/html4/loose.dtd "><HTML><Head><Metahttp-equiv= "Content-type"content= "text/html; charset=iso-8859-1"><title>Insert Title here</title></Head><Body><H1>Your profile</H1><C:outvalue= "${spitter.username}"/><BR/><C:outvalue= "${spitter.username}"/><BR/><C:outvalue= "${spitter.username}"/><BR/></Body></HTML>
Verifying the form
Use JSR-303 Validation to verify
(1) First to transform the entity class
....
@NotNull @Size (min=5, max=16) // non-empty, 5 to 16 characters Private String UserName; @NotNull @Size (min=5, max=16) // non-empty, 5 to 16 characters private String FirstName; @NotNull @Size (min=5, max=16) // non-empty, 5 to 16 characters private String LastName; @NotNull @Size (min=5, max=25) // non-empty, 5 to 25 characters private String password; ....
(2) Then change the method in the controller
.....
@RequestMapping (value= "/register", Method=requestmethod.post) public String processregistration ( @Valid spittle spittle, Errors Errors ) {System.out.println (errors.haserrors () + "" if (Errors.haserrors ()) { return "Registerform" Repository.save (spittle); return "redirect:/spitter/" + Spittle.getusername (); }
...
The required jar packages are classmate-1.0.0, hibernate-jpa-2.1-api-1.0.2.final, Hibernate-validator-5.1.0.final, Jboss-logging-3.3.2.final, joda-time-2.1, jsoup-1.7.1, paranamer-2.5.5, validation-api-2.0.1.final
Returns to the Registerform page when the parameter check is not passed
Building a Spring Web application (iii)
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