使用Dropwizard的Jersey过滤器，拦截器和MessageBodyReader

问题描述 投票：0回答：1

我正在一个dropwizard项目中探索球衣过滤器。尝试探索如何在公共场所为每个端点拦截传入的请求，以对请求对象（例如，路径参数，查询参数或请求主体）执行一些基本检查我正在尝试遵循界面

  • 过滤器
  • ContainerRequestFilter
  • ReaderInterceptor
  • MessageBodyReader

我能够实现Filter和ContainerRequest Filter，并查看这些实现中的代码正在执行。但是我的ReaderInterceptor和MessageBodyReader没有得到执行。

这是我的代码

PersonResource.java

@Path("person")
@Api("Person Resource")
@Log
@MyAnnotation
public class PersonResource {
  @GET
  @Path("{id}")
  @Produces(MediaType.APPLICATION_JSON)
  public Person getPerson(@PathParam("id") String id){
    log.info("Requesting Person information...");
    return new Person(id,"Person Name");
  }

}

过滤器实现

package com.practice.rigz.interceptor;


import lombok.extern.java.Log;

import javax.servlet.*;
import javax.ws.rs.ext.Provider;
import java.io.IOException;

@Provider
@Log
public class RequestFilter implements Filter {
  @Override
  public void init(FilterConfig filterConfig) throws ServletException {
  log.info("INIT...");
  }

  @Override
  public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
    filterChain.doFilter(servletRequest,servletResponse);
    log.info("DO FILTER...");
  }

  @Override
  public void destroy() {
    log.info("DESTROY...");
  }

}

ContainerRequestFilter实现

package com.practice.rigz.interceptor;

import com.practice.rigz.annotations.MyAnnotation;
import lombok.extern.java.Log;

import javax.ws.rs.container.*;
import javax.ws.rs.ext.Provider;
import java.io.IOException;
import java.util.List;

@Provider
@Log
@MyAnnotation
public class RequestContainerRequestFilter implements ContainerRequestFilter {
  @Override
  public void filter(ContainerRequestContext requestContext) throws IOException {
  log.info(String.join(","   ,requestContext.getPropertyNames()));
    List<String> partnerId = requestContext.getUriInfo().getPathParameters().get("id");
    if (partnerId.get(0).equals("1")){
      throw new IllegalAccessError();
    }
    log.info("CONTAINER REQUEST FILTER...");
  }

}

阅读器拦截器实现

package com.practice.rigz.interceptor;

import com.practice.rigz.annotations.MyAnnotation;
import lombok.extern.java.Log;

import javax.ws.rs.WebApplicationException;
import javax.ws.rs.ext.Provider;
import javax.ws.rs.ext.ReaderInterceptor;
import javax.ws.rs.ext.ReaderInterceptorContext;
import java.io.IOException;

@Log
@MyAnnotation
@Provider
public class RequestReaderInterceptor implements ReaderInterceptor {
  @Override
  public Object aroundReadFrom(ReaderInterceptorContext readerInterceptorContext) throws IOException, WebApplicationException {
    log.info("INTERCEPTOR");
    return readerInterceptorContext.proceed();
  }
}

MessageBodyReader实现

package com.practice.rigz.interceptor;

import com.practice.rigz.annotations.MyAnnotation;
import lombok.extern.java.Log;

import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.Provider;
import java.io.IOException;
import java.io.InputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

@Provider
@Log
@MyAnnotation
public class RequestMessageBodyReader implements MessageBodyReader {
  @Override
  public boolean isReadable(Class aClass, Type type, Annotation[] annotations, MediaType mediaType) {
    log.info("IS READABLE...");
    return false;
  }

  @Override
  public Object readFrom(Class aClass, Type type, Annotation[] annotations, MediaType mediaType, MultivaluedMap multivaluedMap, InputStream inputStream) throws IOException, WebApplicationException {
    log.info("READ FROM ...");
    return null;
  }
}

并且在我的Dropwizard Application运行方法中，我正在如下注册所有组件

  private void registerFilters(Environment environment) {
     environment.servlets().addFilter("request-filter", RequestFilter.class)
       .addMappingForUrlPatterns(java.util.EnumSet.allOf(javax.servlet.DispatcherType.class), true, "/*");
     environment.jersey().register(RequestMessageBodyReader.class);
     environment.jersey().register(RequestReaderInterceptor.class);
     environment.jersey().register(RequestContainerRequestFilter.class);
  }

知道我的MessageBodyReader和ReaderInterceptor为什么行不通吗？我正在使用OpenJDK11和Dropwizard 1.3.16

以下是尝试到达终点时我程序的输出

INFO [2019-11-23 16：29：07,016] com.practice.rigz.interceptor.RequestContainerRequestFilter：org.glassfish.jersey.message.internal.TracingLoggerINFO [2019-11-23 16：29：07,019] com.practice.rigz.interceptor.RequestContainerRequestFilter：容器请求过滤器...INFO [2019-11-23 16：29：07,045] com.practice.rigz.resources.Person资源：请求人信息...INFO [2019-11-23 16：29：07,119] com.practice.rigz.interceptor.RequestFilter：做过滤器...0：0：0：0：0：0：0：1--[23 / Nov / 2019：16：29：07 +0000]“ GET / person / 1111 HTTP / 1.1” 200 34“ http://localhost:8080/swagger”“ Mozilla / 5.0（Macintosh；英特尔Mac OS X 10_14_6）AppleWebKit / 605.1.15（KHTML，例如Gecko）版本/13.0.3 Safari / 605.1.15“ 242

java dropwizard java-11
1个回答
0
投票

我发现了问题的原因。我需要的一些东西在这里

  1. 拦截器适用于POST方法。
  2. MessageBodyReader也适用于Post方法，因为只有POST才能包含主体。我总是从isReadableMethod返回false。如果我希望我的实现处理特定类型的请求，则此方法应该返回true。将实现更改为以下
package com.practice.rigz.interceptor;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.jaxrs.json.JacksonJaxbJsonProvider;
import com.practice.rigz.annotations.MyAnnotation;
import com.practice.rigz.model.Person;
import lombok.extern.java.Log;
import org.hibernate.validator.internal.util.privilegedactions.NewJaxbContext;

import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Link;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.Provider;
import java.io.IOException;
import java.io.InputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

@Provider
@Log
@MyAnnotation
public class RequestMessageBodyReader implements MessageBodyReader<Person> {

  @Override
  public boolean isReadable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
    log.info("IS READABLE...");
    return type == Person.class;
  }

  @Override
  public Person readFrom(Class<Person> type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, String> httpHeaders, InputStream entityStream) throws IOException, WebApplicationException {
    ObjectMapper mapper = new ObjectMapper();
    Person person = mapper.readValue(entityStream, Person.class);
    log.info("READ FROM...");
    return person;

  }
}
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