Grails 3 拦截器和渲染自定义 JSON 视图

Question

我正在尝试编写一个 Grails 3 拦截器，它应该检查 HTTP Headers 中是否存在某些变量。如果它们不存在，我想呈现一个特定的 json 视图，但似乎 render 方法在 before() 方法中不可用。

boolean before() {
   String header = request.getHeader("Authorization")

   if(!header) {
       BaseException exception = new BadRequestException("test")
       render view: "/genericErrorReponse", model: [e: exception]
       return false
   }

有没有更好的方法达到预期效果？

我在尝试呈现 JSON 视图时遇到以下错误。

No qualifying bean of type [org.springframework.web.servlet.ViewResolver] is defined.
No qualifying bean of type [org.springframework.web.servlet.ViewResolver] is defined: expected single matching bean but found 4: groovyMarkupViewResolver,jsonViewResolver,beanNameViewResolver,mvcViewResolver. Stacktrace follows:
org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [org.springframework.web.servlet.ViewResolver] is defined: expected single matching bean but found 4: groovyMarkupViewResolver,jsonViewResolver,beanNameViewResolver,mvcViewResolver
at grails.artefact.Interceptor$Trait$Helper.render(Interceptor.groovy:254) ~[grails-plugin-interceptors-3.1.1.jar:3.1.1]
at device.registration.RegistrationInterceptor.before(RegistrationInterceptor.groovy:13) ~[main/:na]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_66]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[na:1.8.0_66]
at java.lang.Thread.run(Thread.java:745) [na:1.8.0_66]

Interceptor Code

class RegistrationInterceptor {

    boolean before() {
        String header = request.getHeader("Authorization")

        if(!header) {
            render view: "/genericErrorResponse", model: [e: new BadRequestException()]
        }

        false
    }

    boolean after() { true }

    void afterView() {
        // no-op
    }
}

JSON View [/genericErrorResponse]

model {
    BaseException e
}

response.status e.status

json {
    message e.message
    error e.error
    status e.status
    timestamp e.timestamp
}

Answer 1

Stacktrace 显示您正在尝试在 RegistrationInterceptor.groovy:13 获取 org.springframework.web.servlet.ViewResolver 类型的 bean。 Grails 默认有 4 种不同的 ViewResolver 实现，您必须具体说明要使用哪一种。

Answer 2

看来这实际上是 Grails 3 中的一个错误。请参阅 https://github.com/grails/grails-core/issues/9688

Grails 3 拦截器和渲染自定义 JSON 视图

Grails 3 Interceptor and render custom JSON view

grails

grails-3.1