java - Jersey 使用错误消息正文编写器提供商

Question

我最近开始使用 jersey 1.6 开发 Rest Web 服务。我有 2 个生成 JSON 的服务。我为它们设置了 MessageBodyWriters 来处理对象到 Json 的转换。我完成了我的第一个网络服务，一切都按预期运行良好。当尝试实现我的第二个服务时，我遇到了 Jersey 调用我为第一个 Web 服务设置的 messagebodywriter 提供程序而不是我创建的新服务的问题。这正在生成类转换异常。如果我从第一个服务中删除提供程序，以便只有第二个服务存在，它会按预期工作。以下是我的设置:

服务#1

  @POST
    @Path("/medical")
    @Produces(MediaType.APPLICATION_JSON)
    public RateListWrapper getMedicalRate(@FormParam("zip") String zip, @FormParam("cpt")     List<String> cptList, @FormParam("dos") String dos, @FormParam("mod1") List<String> mod1List, 
            @FormParam("mod2") List<String> mod2List, @FormParam("mod3") List<String> mod3List, @FormParam("mod4") List<String> mod4List, @FormParam("units") List<String> unitsList,
            @FormParam("pos") List<String> posList) {
    }

服务#1提供商

@Provider
public class RateListWraperProvider implements MessageBodyWriter<RateListWrapper>{

    @Override
    public long getSize(RateListWrapper t, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        //System.out.println("Get Size");
        return -1;
    }

    @Override
    public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        //System.out.println("Is Writable");
        return true;
    }

    @Override
    public void writeTo(RateListWrapper t, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType,
            MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream) throws IOException, WebApplicationException {

        final GsonBuilder gsonBuilder = new GsonBuilder();
        gsonBuilder.setDateFormat("yyyy-MM-dd");
        Gson gson = gsonBuilder.serializeNulls().create();
        entityStream.write(gson.toJson(t).getBytes());

    }

}

服务#2

@POST
@Path("/medical/post")
@Produces(MediaType.APPLICATION_JSON)
public RbrvsListWrapper medicalRatePost(@FormParam("zip") String zip, @FormParam("facilitytype") String facilityType, @FormParam("cpt") List<String> cptList, @FormParam("dos") String dos, @FormParam("mod1") List<String> mod1List) {
    return getMedicalRate(zip, facilityType, cptList, dos, mod1List);
}

服务 #2 提供商

@Provider
public class RbrvsListWrapperProvider implements MessageBodyWriter<RbrvsListWrapper>{

    @Override
    public long getSize(RbrvsListWrapper t, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        //System.out.println("Get Size");
        return -1;
    }

    @Override
    public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        //System.out.println("Is Writable");
        return true;
    }

    @Override
    public void writeTo(RbrvsListWrapper t, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType,
            MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream) throws IOException, WebApplicationException {

        final GsonBuilder gsonBuilder = new GsonBuilder();
        gsonBuilder.setDateFormat("yyyy-MM-dd");
        Gson gson = gsonBuilder.serializeNulls().create();
        entityStream.write(gson.toJson(t).getBytes());

    }



}

这是我的 web.xml 中的 Jersey 配置:

  <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.config.property.packages</param-name>
      <param-value>com.dataws</param-value>
    </init-param>
    <init-param>
      <param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name>
      <param-value>true</param-value>
    </init-param>
    <load-on-startup>2</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>jersey-serlvet</servlet-name>
    <url-pattern>/ws/*</url-pattern>
  </servlet-mapping>

更新

我升级到1.17，问题仍然存在。这是类转换异常发生的堆栈跟踪

java.lang.ClassCastException: com.dataws.json.RbrvsListWrapper cannot be cast to com.dataws.json.RateListWrapper
    at com.dataws.provider.RateListWraperProvider.getSize(RateListWraperProvider.java:1)
    at com.sun.jersey.spi.container.ContainerResponse.write(ContainerResponse.java:289)
    at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1479)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1391)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1381)
    at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416)
    at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:538)
    at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:716)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:947)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1009)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:722)

Answer 1

使用@maslim建议并使用Jackson创建JSON。删除了我的自定义提供程序，这两项服务现在都按预期工作。