Spring Validation Using Annotation在这个例子中你会学到用spring annotation 验证。当你用注解的controller类时。validate()方法不会自动调用。 当表单提交的时候onSubmit()方法会被调用.这里你需要首先调用UserValidator 的validate()方法，然后用hasErrors() 方法检查是否有错。如果有错，转发user到user注册表单并显示错误信息.如果没有错，显示是success界面.
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package com.vaannila.web;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.stereotype.Controller;
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import org.springframework.ui.ModelMap;
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import org.springframework.validation.BindingResult;
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import org.springframework.web.bind.annotation.ModelAttribute;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.RequestMethod;
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import org.springframework.web.bind.annotation.SessionAttributes;
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import com.vaannila.domain.User;
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import com.vaannila.service.UserService;
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import com.vaannila.validator.UserValidator;
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@Controller
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@RequestMapping("/userRegistration.htm")
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@SessionAttributes("user")
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public class UserController {
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private UserService userService;
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private UserValidator userValidator;
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@Autowired
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public UserController(UserService userService, UserValidator userValidator) {
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this.userService = userService;
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this.userValidator = userValidator;
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}
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@RequestMapping(method = RequestMethod.GET)
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public String showUserForm(ModelMap model) {
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User user = new User();
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model.addAttribute("user", user);
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return "userForm";
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}
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@RequestMapping(method = RequestMethod.POST)
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public String onSubmit(@ModelAttribute("user") User user,
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BindingResult result) {
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userValidator.validate(user, result);
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if (result.hasErrors()) {
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return "userForm";
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} else {
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userService.add(user);
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return "redirect:userSuccess.htm";
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}
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}
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}
UserService和UserValidator用 @Autowired注解注入，spring bean 配置文件如下： 01.
<?xml version="1.0" encoding="UTF-8"?>
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<beans xmlns="http://www.springframework.org/schema/beans"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns:p="http://www.springframework.org/schema/p"
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xmlns:context="http://www.springframework.org/schema/context"
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xsi:schemaLocation="http://www.springframework.org/schema/beans
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http://www.springframework.org/schema/beans/spring-beans.xsd
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http://www.springframework.org/schema/context
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http://www.springframework.org/schema/context/spring-context.xsd">
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<bean id="viewResolver" class="org.springframework.web.servlet.view. InternalResourceViewResolver" p:prefix="/WEB-INF/jsp/"p:suffix=".jsp" />
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<bean id="messageSource" class="org.springframework.context.support. ResourceBundleMessageSource" p:basename="messages" />
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<context:component-scan base-package="com.vaannila.web" />
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<bean id="userService" class="com.vaannila.service.UserServiceImpl" />
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<bean id="userValidator" class="com.vaannila.validator.UserValidator"/>
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</beans>
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