jersey - 以编程方式在 Jersey 中声明路径参数

Question

我正在尝试以编程方式创建 Jersey 资源(没有注释)。我有一个将 Name 和 id 作为输入参数的方法 raiseAlarm。我想从 JSON 输入中获取名称，并且我希望 id 来自路径参数。代码看起来像这样......

public class JerseyExample
{
    public static void main(String[] args)
    {
        JerseyExample deployer = new JerseyExample();
        deployer.init();
    }

    public static class BaseResource extends ResourceConfig
    {
        public BaseResource()
        {
            init();
        }

        public void init()
        {
            try
            {
                Resource.Builder resourceBuilder2 = Resource.builder();
                resourceBuilder2.path("/raiseAlarm/{id}");
                ResourceMethod.Builder method2 = resourceBuilder2.addMethod("POST")
                    .consumes(MediaType.APPLICATION_JSON_TYPE)
                    .produces(MediaType.APPLICATION_JSON_TYPE)
                    .handledBy(this,
                        this.getClass().getMethod("raiseAlarm", Name.class, String.class));

                Resource childResource1 = resourceBuilder2.build();

                Resource.Builder resourceBuilder = Resource.builder();
                resourceBuilder.path("/employee/status");
                resourceBuilder.addChildResource(childResource1);
                Resource rootResource = resourceBuilder.build();
                registerResources(rootResource);
            }
            catch (Exception e)
            {
                e.printStackTrace();
            }
        }

        public String raiseAlarm(Name notification, @PathParam("id") String id)
        {
            System.out.println("INSIDE RAISE ALARM ");
            System.out.println(notification.toString() + " ID: " + id);
            return "Result";
        }

        public void destroy()
        {

        }

        public static class Name
        {

            String firstName;

            String lastName;

            String middleName;

            public String getFirstName()
            {
                return firstName;
            }

            public void setFirstName(String firstName)
            {
                this.firstName = firstName;
            }

            public String getLastName()
            {
                return lastName;
            }

            public void setLastName(String lastName)
            {
                this.lastName = lastName;
            }

            public String getMiddleName()
            {
                return middleName;
            }

            public void setMiddleName(String middleName)
            {
                this.middleName = middleName;
            }

            @Override
            public String toString()
            {
                return firstName + " " + middleName + " " + lastName;
            }
        }
    }

    public void init()
    {

        Server server = new Server();

        ServletContextHandler context0 =
            new ServletContextHandler(ServletContextHandler.SESSIONS);
        ServletHolder serveltHolder1 =
            new ServletHolder(new ServletContainer(new BaseResource()));

        context0.addServlet(serveltHolder1, "/*");
        context0.setVirtualHosts(new String[] {"@external"});
        ServerConnector connector = new ServerConnector(server);
        connector.setHost("localhost");
        connector.setPort(9069);
        connector.setName("external");

        HandlerCollection collection = new HandlerCollection();
        collection.addHandler(context0);
        server.setHandler(collection);
        server.addConnector(connector);

        try
        {
            server.start();
            server.join();
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }
}

上面的代码有效。我想知道一种可以以编程方式声明 Path 参数或查询参数的方法，以便我可以将我的方法签名定义为 raiseAlarm(Name notification,String id) 并避免 @PathParam("id") 注释。

Answer 1

我知道前段时间有人问过这个问题，但我遇到了同样的问题并找到了答案。查看我的问题和自己的答案 here获取完整代码。

您必须以与 @Path 注释相同的方式添加具有路径 的子资源。之后可以通过context的getUriInfo()方法获取path参数。

像这样(假设您已经有一个 Resource.Builder 对象):

final Resource.Builder subResourceBuilder = resourceBuilder.addChildResource("{id}");

subResourceBuilder.addMethod("GET")
    .produces(MediaType.APPLICATION_JSON_TYPE)
    .handledBy(new Inflector<ContainerRequestContext, Response>() {

    @Override
    public Response apply(ContainerRequestContext rctx) {
         // Get to the path parameter                    
         MultivaluedMap<String, String> pparams = rctx.getUriInfo().getPathParameters();
         List<String> idValues = pparams.get("id");
         // Create response here
    }
});