如何在Jersey REST中处理空/空请求有效负载

Question

我有一个使用Jersey编写的RESTful Web服务,如下所示:

@POST
@Consumes(MediaType.APPLICATION_JSON)
public Response myAction(RequestObject requestObject) {
    // do some action
}

请求对象只是一个简单的DTO:

public class RequestObject implements Serializable {
    private String theString;

    // Getter for member
}

当我尝试使用空请求有效负载执行POST时,我希望RequestObject要么为null,要么theString为null.相反,我得到了这个:

根本原因

java.io.EOFException: No content to map to Object due to end of input
    org.codehaus.jackson.map.ObjectMapper._initForReading(ObjectMapper.java:2766)
    org.codehaus.jackson.map.ObjectMapper._readValue(ObjectMapper.java:2682)
    org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java:1308)
    org.codehaus.jackson.jaxrs.JacksonJsonProvider.readFrom(JacksonJsonProvider.java:419)
    com.sun.jersey.json.impl.provider.entity.JacksonProviderProxy.readFrom(JacksonProviderProxy.java:139)
    com.sun.jersey.spi.container.ContainerRequest.getEntity(ContainerRequest.java:483)
    com.sun.jersey.server.impl.model.method.dispatch.EntityParamDispatchProvider$EntityInjectable.getValue(EntityParamDispatchProvider.java:123)
    com.sun.jersey.server.impl.inject.InjectableValuesProvider.getInjectableValues(InjectableValuesProvider.java:46)
    com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$EntityParamInInvoker.getParams(AbstractResourceMethodDispatchProvider.java:153)
    com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:203)
    com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
    com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302)
    com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)
    com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
    com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
    com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1480)
    com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1411)
    com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1360)
    com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1350)
    com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416)
    com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:538)
    com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:716)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)

当我使用看起来像这样的请求有效负载发布时,我得到了所需的结果(theString设置为null):

{}

问题:有没有办法接受空请求有效负载,并在服务器端处理它？

注意:我正在使用泽西提供的POJO支持.

<servlet>
    <servlet-name>jersey-serlvet</servlet-name>
    <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
        <init-param>
            <param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name>
            <param-value>true</param-value>
        </init-param>
</servlet>

Answer 1

尝试实现 ContainerRequestFilter 并在有效负载为空时中止请求。

requestContext.abortWith(Response.status(Response.Status.BAD_REQUEST)
                .entity("Payload is null")
                .build());

更多详情可在这找到