解決方案#1:
具有配置如下:
Error view: @RequestMapping(value = URL, params="error")
Normal view: @RequestMapping(value = URL, params="proceed")
你可以嘗試重定向如下:
的MethodInterceptor的invoke():
if (!valid){
// RequestDispatcher rd = request.getRequestDispatcher(errorView);
// rd.forward(request, response);
response.sendRedirect(errorView);
}
缺點:瀏覽器會發出第二個請求,因此舊的方法參數不再位於httpservletrequest中。
WorkArround:要避免缺點,您可以使用Spring MVC Flash Attribute。您可以按照本教程瞭解Flash Attribute的工作原理。
參考文獻:FlashAttributesExample
解決方案2:
我如何 「正確」 解決這個問題,而不訴諸上面顯示的解決方法 ?有沒有更準確的方法轉發給正確的 彈簧控制器?
您可以通過實施您自己的方式進行合併RequestMappingHandlerAdapter。
解決方案3:
這裏是一個方面的代碼:
這種變通
public class RequestBodyValidatorAspect {
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[][] argAnnotations = method.getParameterAnnotations();
String[] argNames = methodSignature.getParameterNames();
Object[] args = joinPoint.getArgs();
for (int i = 0; i < args.length; i++) {
if (hasRequestBodyAndValidAnnotations(argAnnotations[i])) {
validateArg(args[i], argNames[i]);
}
}
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;
}
@SuppressWarnings({"ThrowableInstanceNeverThrown"})
private void validateArg(Object arg, String argName) {
BindingResult result = getBindingResult(arg, argName);
validator.validate(arg, result);
if (result.hasErrors()) {
throw new HttpMessageConversionException("Validation of controller input parameter failed",
new BindException(result));
}
}
private BindingResult getBindingResult(Object target, String targetName) {
return new BeanPropertyBindingResult(target, targetName);
}
@Required
public void setValidator(Validator validator) {
this.validator = validator;
}
}
一個限制是,它只能申請一個驗證器的所有控制器。你也可以避免它。使用驗證方面和元驗證一起
public class TypeMatchingValidator implements Validator, InitializingBean, ApplicationContextAware {
private ApplicationContext context;
private Collection<Validator> validators;
public void afterPropertiesSet() throws Exception {
findAllValidatorBeans();
}
public boolean supports(Class clazz) {
for (Validator validator : validators) {
if (validator.supports(clazz)) {
return true;
}
}
return false;
}
public void validate(Object target, Errors errors) {
for (Validator validator : validators) {
if (validator.supports(target.getClass())) {
validator.validate(target, errors);
}
}
}
private void findAllValidatorBeans() {
Map<String, Validator> validatorBeans =
BeanFactoryUtils.beansOfTypeIncludingAncestors(context, Validator.class, true, false);
validators = validatorBeans.values();
validators.remove(this);
}
public void setApplicationContext(ApplicationContext context) throws BeansException {
this.context = context;
}
}
Spring XML配置文件:
<!-- enable Spring AOP support -->
<aop:aspectj-autoproxy proxy-target-class="true"/>
<!-- declare the validator aspect and inject the validator into it -->
<bean id="validatorAspect" class="com.something.RequestBodyValidatorAspect">
<property name="validator" ref="validator"/>
</bean>
<!-- inject the validator into the DataBinder framework -->
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="webBindingInitializer">
<bean class="org.springframework.web.bind.support.ConfigurableWebBindingInitializer" p:validator-ref="validator"/>
</property>
</bean>
<!-- declare the meta-validator bean -->
<bean id="validator" class="com.something.TypeMatchingValidator"/>
<!-- declare all Validator beans, these will be discovered by TypeMatchingValidator -->
<bean class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean"/>
<bean class="com.something.PersonValidator"/>
<bean class="com.something.AccountValidator"/>
資源參考文獻:scottfrederick:pring-3-Validation-Aspect
解決方案#4:
又一解決方案使用aop進行表單驗證,您可以查看博客:form-validation-using-aspect-oriented-programming-aop-in-spring-framework
你能分享所有的源代碼github或** MethodInterceptor invoke()**更多詳細信息? – CrawlingKid