• SPRING IN ACTION 第4版笔记-第六章RENDERING WEB VIEWS-002- Spring的JSP标签之form标签(<sf:input><sf:errors><sf:form>)


    一、

    Spring offers two JSP tag libraries to help define the view of your Spring MVC web views.

    One tag library renders HTML form tags that are bound to a model attribute.

    The other has a hodgepodge of utility tags that come in handy from time to time.

    1.Spring支持的form标签

    2.一般用法

     1 <%@ taglib uri="http://www.springframework.org/tags/form" prefix="sf" %>
     2 <sf:form method="POST" commandName="spitter">
     3     First Name:
     4     <sf:input path="firstName" />
     5     <br/> Last Name:
     6     <sf:input path="lastName" />
     7     <br/> Email:
     8     <sf:input path="email" />
     9     <br/> Username:
    10     <sf:input path="username" />
    11     <br/> Password:
    12     <sf:password path="password" />
    13     <br/>
    14     <input type="submit" value="Register" />
    15 </sf:form>

    path是和model里的对象的属性对应,commandName是和model的key对应,这里设定了commandName="spitter",则要保证每个返回到这个view的handler的model都要有值为"spitter"的key,所以showRegistrationForm()要修改,返回一个空对象,否则会报java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'spitter' available as request attribute。

    1 RequestMapping(value = "/register", method = GET)
    2 public String showRegistrationForm(Model model) {
    3     model.addAttribute(new Spitter());
    4     return "registerForm";
    5 }

    3.Spring form标签还支持html5,如可以指定data、range、email

    <sf:input path="email" type="email" />

    4.显示错误

    1 <sf:form method="POST" commandName="spitter">
    2     First Name:
    3     <sf:input path="firstName" />
    4     <sf:errors path="firstName" />
    5     <br/> ...
    6 </sf:form>

    若验证有错,会解析类似如下:

    First Name: <input id="firstName" name="firstName" type="text" value="J"/>
                <span id="firstName.errors">size must be between 2 and 30</span>

    5.可以加css

    1 <sf:form method="POST" commandName="spitter">
    2     First Name:
    3     <sf:input path="firstName" />
    4     <sf:errors path="firstName" cssClass="error" />
    5     <br/> ...
    6 </sf:form>
    span.error {color: red;}

    6.错误集中显示

    <sf:form method="POST" commandName="spitter">
        <sf:errors path="*" element="div" cssClass="errors" /> 
        ...
    </sf:form>
    div.errors {
        background - color: #ffcccc;
        border: 2 px solid red;
    }

    7.哪个字段有错就红色显示该字段

    1 <sf:form method="POST" commandName="spitter">
    2     <sf:label path="firstName" cssErrorClass="error">First Name</sf:label>:
    3     <sf:input path="firstName" cssErrorClass="error" />
    4     <br/> ...
    5 </sf:form>

    8.要实体类中写验证规则

     1 package spittr;
     2 
     3 import javax.validation.constraints.NotNull;
     4 import javax.validation.constraints.Size;
     5 
     6 import org.apache.commons.lang3.builder.EqualsBuilder;
     7 import org.apache.commons.lang3.builder.HashCodeBuilder;
     8 import org.hibernate.validator.constraints.Email;
     9 
    10 public class Spitter {
    11 
    12   private Long id;
    13   
    14   @NotNull
    15   @Size(min=5, max=16, message="{username.size}")
    16   private String username;
    17 
    18   @NotNull
    19   @Size(min=5, max=25, message="{password.size}")
    20   private String password;
    21   
    22   @NotNull
    23   @Size(min=2, max=30, message="{firstName.size}")
    24   private String firstName;
    25 
    26   @NotNull
    27   @Size(min=2, max=30, message="{lastName.size}")
    28   private String lastName;
    29   
    30   @NotNull
    31   @Email
    32   private String email;
    33 
    34   @Override
    35   public boolean equals(Object that) {
    36     return EqualsBuilder.reflectionEquals(this, that, "firstName", "lastName", "username", "password", "email");
    37   }
    38   
    39   @Override
    40   public int hashCode() {
    41     return HashCodeBuilder.reflectionHashCode(this, "firstName", "lastName", "username", "password", "email");
    42   }
    43 
    44 }

    9.验证信息的资源文件,可定不同的语言版本支持国际化(不知道什么时候加载的

    (1)ValidationMessages.properties

    1 firstName.size=First name must be between {min} and {max} characters long.
    2 lastName.size=Last name must be between {min} and {max} characters long.
    3 username.size=Username must be between {min} and {max} characters long.
    4 password.size=Password must be between {min} and {max} characters long.
    5 email.valid=The email address must be valid.

    (2)ValidationMessages_es.properties 西班牙

    1 firstName.size=Nombre debe ser entre {min} y {max} caracteres largo.
    2 lastName.size=El apellido debe ser entre {min} y {max} caracteres largo.
    3 username.size=Nombre de usuario debe ser entre {min} y {max} caracteres largo.
    4 password.size=Contraseña debe estar entre {min} y {max} caracteres largo.
    5 email.valid=La dirección de email no es válida

    (3)webconfig.java

     1 package spittr.web;
     2 
     3 import org.springframework.context.MessageSource;
     4 import org.springframework.context.annotation.Bean;
     5 import org.springframework.context.annotation.ComponentScan;
     6 import org.springframework.context.annotation.Configuration;
     7 import org.springframework.context.support.ReloadableResourceBundleMessageSource;
     8 import org.springframework.web.servlet.ViewResolver;
     9 import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
    10 import org.springframework.web.servlet.config.annotation.EnableWebMvc;
    11 import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
    12 import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
    13 import org.springframework.web.servlet.view.InternalResourceViewResolver;
    14 
    15 @Configuration
    16 @EnableWebMvc
    17 @ComponentScan("spittr.web")
    18 public class WebConfig extends WebMvcConfigurerAdapter {
    19 
    20   @Bean
    21   public ViewResolver viewResolver() {
    22     InternalResourceViewResolver resolver = new InternalResourceViewResolver();
    23     resolver.setPrefix("/WEB-INF/views/");
    24     resolver.setSuffix(".jsp");
    25     return resolver;
    26   }
    27   
    28   @Override
    29   public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
    30     configurer.enable();
    31   }
    32   
    33   @Override
    34   public void addResourceHandlers(ResourceHandlerRegistry registry) {
    35     // TODO Auto-generated method stub
    36     super.addResourceHandlers(registry);
    37   }
    38   
    39   @Bean
    40   public MessageSource messageSource() {
    41     ReloadableResourceBundleMessageSource messageSource = 
    42         new ReloadableResourceBundleMessageSource();
    43     //messageSource.setBasename("file:///Users/habuma/messages");
    44     //messageSource.setBasename("messages");
    45     messageSource.setBasename("classpath:messages");
    46     messageSource.setCacheSeconds(10);
    47     return messageSource;
    48   }
    49  
    50 }

    10.view

     1 <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
     2 <%@ taglib uri="http://www.springframework.org/tags/form" prefix="sf" %>
     3 <%@ page session="false" %>
     4 <html>
     5   <head>
     6     <title>Spitter</title>
     7     <link rel="stylesheet" type="text/css" 
     8           href="<c:url value="/resources/style.css" />" >
     9   </head>
    10   <body>
    11     <h1>Register</h1>
    12 
    13     <sf:form method="POST" commandName="spitter" >
    14       <sf:errors path="*" element="div" cssClass="errors" />
    15       <sf:label path="firstName" 
    16           cssErrorClass="error">First Name</sf:label>: 
    17         <sf:input path="firstName" cssErrorClass="error" /><br/>
    18       <sf:label path="lastName" 
    19           cssErrorClass="error">Last Name</sf:label>: 
    20         <sf:input path="lastName" cssErrorClass="error" /><br/>
    21       <sf:label path="email" 
    22           cssErrorClass="error">Email</sf:label>: 
    23         <sf:input path="email" cssErrorClass="error" /><br/>
    24       <sf:label path="username" 
    25           cssErrorClass="error">Username</sf:label>: 
    26         <sf:input path="username" cssErrorClass="error" /><br/>
    27       <sf:label path="password" 
    28           cssErrorClass="error">Password</sf:label>: 
    29         <sf:password path="password" cssErrorClass="error" /><br/>
    30       <input type="submit" value="Register" />
    31     </sf:form>
    32   </body>
    33 </html>

    11.controller

     1 package spittr.web;
     2 
     3 import static org.springframework.web.bind.annotation.RequestMethod.*;
     4 
     5 import javax.validation.Valid;
     6 
     7 import org.springframework.beans.factory.annotation.Autowired;
     8 import org.springframework.stereotype.Controller;
     9 import org.springframework.ui.Model;
    10 import org.springframework.validation.Errors;
    11 import org.springframework.web.bind.annotation.PathVariable;
    12 import org.springframework.web.bind.annotation.RequestMapping;
    13 
    14 import spittr.Spitter;
    15 import spittr.data.SpitterRepository;
    16 
    17 @Controller
    18 @RequestMapping("/spitter")
    19 public class SpitterController {
    20 
    21   private SpitterRepository spitterRepository;
    22 
    23   @Autowired
    24   public SpitterController(SpitterRepository spitterRepository) {
    25     this.spitterRepository = spitterRepository;
    26   }
    27   
    28 //  @ModelAttribute
    29 //  public Spitter spitter() {
    30 //    return new Spitter();
    31 //  }
    32   
    33   @RequestMapping(value="/register", method=GET)
    34   public String showRegistrationForm(Model model) {
    35     model.addAttribute(new Spitter());
    36     return "registerForm";
    37   }
    38   
    39   @RequestMapping(value="/register", method=POST)
    40   public String processRegistration(
    41       @Valid Spitter spitter, 
    42       Errors errors) {
    43     if (errors.hasErrors()) {
    44       return "registerForm";
    45     }
    46     
    47     spitterRepository.save(spitter);
    48     return "redirect:/spitter/" + spitter.getUsername();
    49   }
    50   
    51   @RequestMapping(value="/{username}", method=GET)
    52   public String showSpitterProfile(@PathVariable String username, Model model) {
    53     Spitter spitter = spitterRepository.findByUsername(username);
    54     model.addAttribute(spitter);
    55     return "profile";
    56   }
    57   
    58 }
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  • 原文地址:https://www.cnblogs.com/shamgod/p/5243527.html
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