Spring MVC 学习笔记 十 使用jsr 303进行校验

Spring MVC在使用了<mvc:annotation-driven> 后,如果路径中有jsr 303的实现,将自动提供对jsr 303验证方式的支持。
一:使用hibernate validator进行数据验证
   选择的是hibernate validator,因此需要修改pom.xml增加对hibernate validator的支持。
		<dependency>
			<groupId>org.hibernate</groupId>
			<artifactId>hibernate-validator</artifactId>
			<version>4.1.0.Final</version>
		</dependency>
   
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
	<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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转载自starscream.iteye.com/blog/1068905
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