这篇文章主要介绍了Spring MVC Annotation验证的方法，小编觉得挺不错的，现在分享给大家，也给大家做个参考。一起跟随小编过来看看吧
简介说明
使用Spring MVC的Annotation验证可以直接对view model的简单数据验证，注意，这里是简单的，如果model的数据验证需要有一些比较复杂的业务逻辑性在里头，只是使用annotation做验证是比较难的。以下是使用Spring MVC自带的annotation验证，加上自定义的一个@Tel的annotation验证例子，此例子具有：1、支持多语言（国际化）2、对默认数据先进行转化，比如int、date类型如果传入空值时，会抛异常，默认给定值先看配置：1、web.xmlTest Spring MVC - 1contextConfigLocationclasspath:spring.xmldispatcherorg.springframework.web.servlet.dispatcherServletcontextConfigLocation1dispatcher/org.springframework.web.context.ContextLoaderListenerindex.jsp这里没什么好说的，只是把spring.xml配置加入到contextConfigLocation中2、spring.xmlmessages在中加入conversion-service，然后在conversion-service中加入系统默认的转换器，如上有IntConverter和DateConverter，当然，也可以是自定的别的类型，这是全局的。在validator验证器中加入了支持多语言的properties，当然，spring的多语言是基于http header的accept-language。3、Controllerpackage com.my.controller; import java.util.List; import javax.validation.Valid; import org.springframework.stereotype.Controller; import org.springframework.validation.BindingResult; import org.springframework.validation.FieldError; 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.my.controller.bean.User4; @Controller @RequestMapping(value="av") public class TestAnnotationValidController { @RequestMapping public ModelAndView index() { ModelAndView view = new ModelAndView("/TestAnnotationValid/index", "user4", new User4()); return view; } @RequestMapping(value="/add", method=RequestMethod.POST) public ModelAndView add(@modelattribute @Valid User4 user, BindingResult result) { ModelAndView view = new ModelAndView("/TestAnnotationValid/index"); view.addobject("user4", user); if(result.hasErrors()) { List errors = result.getFieldErrors(); for(FieldError err : errors) { System.out.println("ObjectName:" + err.getobjectName() + "tFieldName:" + err.getField() + "tFieldValue:" + err.getRejectedValue() + "tMessage:" + err.getDefaultMessage() + "tCode:"); } } return view; } }这是一个简单的controller，在add中，有一个@Valid的annotation，这是必需的，不加这个，annotation验证将不起作用4、User4.java model实体类package com.my.controller.bean; import java.util.Date; import javax.validation.constraints.Max; import javax.validation.constraints.Min; import javax.validation.constraints.NotNull; import javax.validation.constraints.Past; import javax.validation.constraints.Pattern; import javax.validation.constraints.Size; import org.hibernate.validator.constraints.Email; import org.hibernate.validator.constraints.Length; import org.hibernate.validator.constraints.NotBlank; public class User4 { private long id; @NotBlank(message="{valid.name}") private String name; @Length(min=4, max=20, message="{valid.password}") private String password; @NotBlank(message="{valid.required}") @Email(message="{valid.email}") private String email; @NotNull(message="{valid.required}") private boolean married; @Min(value=18, message="{valid.ageMin}") @Max(value=100, message="{valid.ageMax}") private int age; @NotNull(message="{valid.required}") @Past(message="{valid.birthday}") private Date birthday; @Pattern(regexp="^[a-zA-Z]{2,}$", message="{valid.address}") private String address; @Size(min=1, message="{valid.likesMin}") private String[] likes; @com.my.controller.validator.Tel(message="{valid.tel}", min=3) private String tel; public long getId() { return id; } public void setId(long id) { this.id = id; } 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 boolean isMarried() { return married; } public void setMarried(boolean married) { this.married = married; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public Date getBirthday() { return birthday; } public void setBirthday(Date birthday) { this.birthday = birthday; } public String getAddress() { return address; } public void setAddress(String address) { this.address = address; } public String[] getLikes() { return likes; } public void setLikes(String[] likes) { this.likes = likes; } public String getTel() { return tel; } public void setTel(String tel) { this.tel = tel; } }除了@Tel之外，其它都是spring自带的annotation，当然还有别的，自行搜索下 5、message.propertiesvalid.required=字段值不能为空 valid.name=用户名不能为空 valid.password=密码最小4位 valid.ageMin=年龄不能小于{1}岁 valid.ageMax=年龄不能大于{1}岁 valid.email=邮箱格式不正确 valid.address=联系地址不正确 valid.birthday=生日不能大于今天 valid.likesMin=喜好最小不能小于1个 valid.tel=手机号码不能小于{min}位对应的是User4 model的annotation的message值。如果需要国际化的多语言，只需要加入多一个messages_en_US.properties这样名字的文件即可。6、@Telpackage com.my.controller.validator; import java.lang.annotation.ElementType; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target; import javax.validation.Constraint; import javax.validation.Payload; @Target({ElementType.FIELD, ElementType.METHOD}) @Retention(RetentionPolicy.RUNTIME) @Constraint(validatedBy=TelValidator.class) public @interface Tel { int min() default 0; String message(); Class>[] groups() default {}; Class extends Payload>[] payload() default {}; }新建一个interface，注意，annotation的interface java是这样写的：@interfaceTelValidator:package com.my.controller.validator; import javax.annotation.Resource; import javax.validation.ConstraintValidator; import javax.validation.ConstraintValidatorContext; import org.springframework.context.support.ResourceBundleMessageSource; public class TelValidator implements ConstraintValidator { @Resource private ResourceBundleMessageSource messageSource; private Tel tel; @Override public void initialize(Tel tel) { this.tel = tel; } @Override public boolean isValid(String value, ConstraintValidatorContext constraintContext) { boolean isValid; if(value != null && value.length() >= tel.min()) { isValid = true; } else { isValid = false; } if(!isValid) { constraintContext.disableDefaultConstraintViolation(); constraintContext.buildConstraintViolationWithTemplate(tel.message()).addConstraintViolation(); } return isValid; } }这是@Tel的验证实现方法。7、Converterpackage com.my.controller.converter; import org.springframework.core.convert.converter.Converter; public class IntConverter implements Converter { @Override public Integer convert(String text) { if (text == null || "".equals(text)) { return 0; } else { try { Integer value = Integer.parseInt(text); return value; } catch (Exception e) { return 0; } } } }package com.my.controller.converter; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; import org.springframework.core.convert.converter.Converter; public class DateConverter implements Converter { @Override public Date convert(String text) { SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd"); dateFormat.setLenient(false); try { return dateFormat.parse(text); } catch (ParseException e) { e.printstacktrace(); } return null; } }这两个是全局的类型默认转换器。8、测试JSPIndex User name:Password:E-mail:Age:Birthday:Address:Married:Likes:Tel:Errors:Likes:${item},注意，在form中的modelattribute属性值，它对应的是User4类名，小写开头，否则会出错9、页面UI结果：
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