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一、准备校验时使用的JAR
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? 说明:
???????? validation-api-1.0.0.GA.jar是JDK的接口;
???????? hibernate-validator-4.2.0.Final.jar是对上述接口的实现。
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新增一个测试的pojo bean ,增加jsr 303格式的验证annotation
@NotEmpty private String userName; @Email private String email;
在controller 类中的handler method中,对需要验证的对象前增加@Valid
标志
@RequestMapping("/valid") public String valid(@ModelAttribute("vm") [color=red]@Valid[/color] ValidModel vm, BindingResult result) { if (result.hasErrors()) { return "validResult"; } return "helloworld"; }
增加显示验证结果的jsp如下
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%> <html> <head> <title>Reservation Form</title> <style> .error { color: #ff0000; font-weight: bold; } </style> </head> <body> <form:form method="post" modelAttribute="vm"> <form:errors path="*" cssClass="error" /> <table> <tr> <td>Name</td> <td><form:input path="userName" /> </td> <td><form:errors path="userName" cssClass="error" /> </td> </tr> <tr> <td>email</td> <td><form:input path="email" /> </td> <td><form:errors path="email" cssClass="error" /> </td> </tr> <tr> <td colspan="3"><input type="submit" /> </td> </tr> </table> </form:form> </body> </html>
访问
http://localhost:8080/springmvc/valid?userName=winzip&email=winzip
查看验证结果。
二:自定义jsr
303格式的annotation
参考hibernate validator 4 reference
手册中3.1节,增加一个自定义要求输入内容为定长的annotation验证类
新增annotation类定义
@Target( { METHOD, FIELD, ANNOTATION_TYPE }) @Retention(RUNTIME) @Constraint(validatedBy = FixLengthImpl.class) public @interface FixLength { int length(); String message() default "{net.zhepu.web.valid.fixlength.message}"; Class<?>[] groups() default {}; Class<? extends Payload>[] payload() default {}; }
及具体的验证实现类如下
public class FixLengthImpl implements ConstraintValidator<FixLength, String> { private int length; @Override public boolean isValid(String validStr, ConstraintValidatorContext constraintContext) { if (validStr.length() != length) { return false; } else { return true; } } @Override public void initialize(FixLength fixLen) { this.length = fixLen.length(); } }
为使自定义验证标注的message正常显示,需要修改servlet context配置文件,新增messageSource bean,如下
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<bean id="messageSource" class="org.springframework.context.support.ReloadableResourceBundleMessageSource" p:fallbackToSystemLocale="true" p:useCodeAsDefaultMessage="false" p:defaultEncoding="UTF-8"> <description>Base message source to handle internationalization </description> <property name="basenames"> <list> <!-- main resources --> <value>classpath:valid/validation</value> </list> </property> </bean>
表示spring 将从路径valid/validation.properties中查找对于的message。
新增valid bean 引用新增的messageSource bean,表示valid message将从messageSource bean 注入。
<bean id="validator" class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean" p:validationMessageSource-ref="messageSource"> <description>Enable the bean validation provider, and configure it to use the messageSource when resolving properties</description> </bean>
修改 <mvc:annotation-driven> 增加对validator
bean的引用
<mvc:annotation-driven validator="validator" />
最后修改之前新增的pojo
bean ,新增一个mobileNO属性并增加对自定义标注的引用
@FixLength(length=11) private String mobileNO;
在前端jsp中也增加新字段的支持
<tr> <td>mobileno</td> <td><form:input path="mobileNO" /> </td> <td><form:errors path="mobileNO" cssClass="error" /> </td> </tr>
可访问url
http://localhost:8080/springmvc/valid?userName=winzip&email=winzip&mobileNO=138188888
来查看修改的结果。
三
json输入的验证
Spring mvc
3.0.5中对于json格式的输入直接使用@valid标注有问题,目前这个bug还未修复 (见 SPR-6709),预计在3.1 m2版本中会修复。
在此之前,可以通过如下几种方式来对json(或xml)格式的输入来进行验证。
1:在handler method中直接对输入结果进行验证
@RequestMapping("/validJson1") @ResponseBody public JsonResult processSubmitjson(@RequestBody ValidModel vm, HttpServletRequest request) { JsonResult jsonRst = new JsonResult(); Set<ConstraintViolation<ValidModel>> set = validator.validate(vm); for (ConstraintViolation<ValidModel> violation : set) { String propertyPath = violation.getPropertyPath().toString(); ; String message = violation.getMessage(); log.error("invalid value for: '" + propertyPath + "': " + message); } if (!set.isEmpty()){ jsonRst.setSuccess(false); jsonRst.setMsg("输入有误!"); return jsonRst; } jsonRst.setSuccess(true); jsonRst.setMsg("输入成功!"); return jsonRst; }
可通过修改后的helloworld.jsp中的json valid test1按钮进行调用测试。
2:将此验证逻辑封装为一个AOP,当需验证的对象前有@valid标注和@RequestBody标注时开始验证
新增handler
method如下
@RequestMapping("/validJson2") @ResponseBody public JsonResult testJson4(@RequestBody @Valid ValidModel vm){ log.info("handle json for valid"); return new JsonResult(true,"return ok"); }
这里没有对输入值做任何验证,所有的验证都在AOP中完成。
修改pom.xml增加对AOP相关类库的引用。
<dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.6.11</version> </dependency> <dependency> <groupId>cglib</groupId> <artifactId>cglib</artifactId> <version>2.2.2</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>${org.springframework.version}</version> </dependency>
修改servet context xml,增加对aop的支持。
<!-- enable Spring AOP support --> <aop:aspectj-autoproxy proxy-target-class="true" />
最后,新增AOP类
public class CustomerValidatorAOP { private Validator validator; @Pointcut("@annotation(org.springframework.web.bind.annotation.RequestMapping)") private void controllerInvocation() { } @Around("controllerInvocation()") public Object aroundController(ProceedingJoinPoint joinPoint) throws Throwable { MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature(); Method method = methodSignature.getMethod(); Annotation[] annotationList = method.getAnnotations(); /* for(Annotation anno:annotationList){ System.out.println(ResponseBody.class.isInstance(anno)); } */ Annotation[][] argAnnotations = method.getParameterAnnotations(); String[] argNames = methodSignature.getParameterNames(); Object[] args = joinPoint.getArgs(); for (int i = 0; i < args.length; i++) { if (hasRequestBodyAndValidAnnotations(argAnnotations[i])) { Object ret = validateArg(args[i], argNames[i]); if(ret != null){ return ret; } } } return joinPoint.proceed(args); } private boolean hasRequestBodyAndValidAnnotations(Annotation[] annotations) { if (annotations.length < 2) return false; boolean hasValid = false; boolean hasRequestBody = false; for (Annotation annotation : annotations) { if (Valid.class.isInstance(annotation)) hasValid = true; else if (RequestBody.class.isInstance(annotation)) hasRequestBody = true; if (hasValid && hasRequestBody) return true; } return false; } private JsonResult validateArg(Object arg, String argName) { BindingResult result = getBindingResult(arg, argName); validator.validate(arg, result); if (result.hasErrors()) { JsonResult jsonresult = new JsonResult(); jsonresult.setSuccess(false); jsonresult.setMsg("fail"); return jsonresult; } return null; } private BindingResult getBindingResult(Object target, String targetName) { return new BeanPropertyBindingResult(target, targetName); } @Required public void setValidator(Validator validator) { this.validator = validator; }
这里只考虑了输入为json格式的情况,仅仅作为一种思路供参考,实际使用时需要根据项目具体情况进行调整。
可通过修改后的helloworld.jsp中的json valid test2按钮进行调用测试。
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原文:http://starscream.iteye.com/blog/1068905