Spring MVC Validator @InitBinder and WebDataBinder;Validator是一个用来我们自定义验证的sping接口,WebDataBinder 绑定你的自定义参数,你直接在你的控制器类中通过@InitBinder 注解的方式配置 Web 数据绑定.registerCustomEditor()是一个属性编辑器,比如自定义的日期编辑它绑定web请求参数到JavaBean的属性;
下面一个例子,我们创建一个JavaBean(username, password, email and date of birth of a user),我们创建两个自定义的验证类.第一个,我们验证用户名和密码.第二个,验证邮箱,
在Eclipse中Demo的结构
Validator 是一个有两个方法的接口;
boolean supports(Class<?> clazz) : 检验参数是否验证成功的实例类;
void validate(Object target, Errors errors) : 如果 supports() 方法返回真, target object 合法. Errors.rejectValue() 方法用一个字段名注册错误信息;
UserValidator.java
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package com.concretepage.validators; import org.springframework.stereotype.Component; import org.springframework.validation.Errors; import org.springframework.validation.ValidationUtils; import org.springframework.validation.Validator; import com.concretepage.User; @Component public class UserValidator implements Validator { @Override public boolean supports(Class<?> clazz) { return User. class .isAssignableFrom(clazz); } @Override public void validate(Object target, Errors errors) { User user = (User)target; ValidationUtils.rejectIfEmptyOrWhitespace(errors, "name" , "" , "Username is empty" ); ValidationUtils.rejectIfEmptyOrWhitespace(errors, "password" , "" , "Password is empty" ); if (user.getName().length()< 5 ) { errors.rejectValue( "name" , "" , "Username length is less than 5" ); } } } |
EmailValidator.java
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package com.concretepage.validators; import org.springframework.stereotype.Component; import org.springframework.validation.Errors; import org.springframework.validation.ValidationUtils; import org.springframework.validation.Validator; import com.concretepage.User; @Component public class EmailValidator implements Validator { @Override public boolean supports(Class<?> clazz) { return User. class .isAssignableFrom(clazz); } @Override public void validate(Object target, Errors errors) { User user = (User)target; ValidationUtils.rejectIfEmptyOrWhitespace(errors, "email" , "" , "Email is empty" ); if (!user.getEmail().contains( "@" )) { errors.rejectValue( "email" , "" , "Email is not valid." ); } } } |
User.java
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package com.concretepage; import java.util.Date; public class User { private String name; private String password; private String email; private Date dob; public String getName() { return name; } public void setName(String name) { this .name = name; } public String getPassword() { return password; } public void setPassword(String password) { this .password = password; } public String getEmail() { return email; } public void setEmail(String email) { this .email = email; } public Date getDob() { return dob; } public void setDob(Date dob) { this .dob = dob; } } |
MyWorldController
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package com.concretepage; import java.text.SimpleDateFormat; import java.util.Date; import javax.validation.Valid; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.propertyeditors.CustomDateEditor; import org.springframework.stereotype.Controller; import org.springframework.ui.ModelMap; import org.springframework.validation.BindingResult; import org.springframework.web.bind.WebDataBinder; import org.springframework.web.bind.annotation.InitBinder; import org.springframework.web.bind.annotation.ModelAttribute; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.servlet.ModelAndView; import com.concretepage.validators.EmailValidator; import com.concretepage.validators.UserValidator; @Controller @RequestMapping ( "/myworld" ) public class MyWorldController { @Autowired private UserValidator userValidator; @Autowired private EmailValidator emailValidator; @RequestMapping (value= "signup" , method = RequestMethod.GET) public ModelAndView user(){ return new ModelAndView( "user" , "user" , new User()); } @InitBinder public void dataBinding(WebDataBinder binder) { binder.addValidators(userValidator, emailValidator); SimpleDateFormat dateFormat = new SimpleDateFormat( "dd/MM/yyyy" ); dateFormat.setLenient( false ); binder.registerCustomEditor(Date. class , "dob" , new CustomDateEditor(dateFormat, true )); } @RequestMapping (value= "save" , method = RequestMethod.POST) public String createUser( @ModelAttribute ( "user" ) @Valid User user,BindingResult result, ModelMap model) { if (result.hasErrors()) { return "user" ; } System.out.println( "Name:" + user.getName()); System.out.println( "Email:" + user.getEmail()); System.out.println( "Date of Birth:" + user.getDob()); model.addAttribute( "msg" , "Welcome to My World!" ); return "success" ; } } |
Form页面表单
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< form:form action = "save" method = "post" commandName = "user" > < tr > < td >User Name:</ td > < td >< form:input path = "name" /> </ td > < td > < form:errors path = "name" cssStyle = "color: red;" /></ td > </ tr > < tr > < td > Password :</ td > < td >< form:input path = "password" /> </ td > < td > < form:errors path = "password" cssStyle = "color: red;" /> </ td > </ tr > < tr > < td > Email :</ td > < td >< form:input path = "email" /> </ td > < td > < form:errors path = "email" cssStyle = "color: red;" /> </ td > </ tr > < tr > < td > Date of Birth :</ td > < td >< form:input path = "dob" /> </ td > < td > < form:errors path = "dob" cssStyle = "color: red;" /> </ td > </ tr > < tr > < td colspan = 3 > < input type = "submit" > </ td > </ form:form > |
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。