Question

泽西岛1.6可以产生：

@Path("/stock")
public class StockResource {
    @GET
    @Produces(MediaType.APPLICATION_JSON)
    public List<Stock> get() {
        Stock stock = new Stock();
        stock.setQuantity(3);
        return Lists.newArrayList(stock);
    }
}

但不能这样做：

@Path("/stock")
public class StockResource {
    @GET
    @Produces(MediaType.APPLICATION_JSON)
    public Response get() {
        Stock stock = new Stock();
        stock.setQuantity(3);
        return Response.ok(Lists.newArrayList(stock)).build();
    }
}

给出错误：A message body writer for Java class java.util.ArrayList, and Java type class java.util.ArrayList, and MIME media type application/json was not found

这可以防止使用HTTP状态代码和标头。

Answer 1

可以通过以下方式在响应中嵌入List<T>：

@Path("/stock")
public class StockResource {
    @GET
    @Produces(MediaType.APPLICATION_JSON)
    public Response get() {
        Stock stock = new Stock();
        stock.setQuantity(3);

        GenericEntity<List<Stock>> entity = 
            new GenericEntity<List<Stock>>(Lists.newArrayList(stock)) {};
        return Response.ok(entity).build();
    }
}

客户必须使用以下行来获取List<T>：

public List<Stock> getStockList() {
    WebResource resource = Client.create().resource(server.uri());
    ClientResponse clientResponse =
        resource.path("stock")
        .type(MediaType.APPLICATION_JSON)
        .get(ClientResponse.class);
    return clientResponse.getEntity(new GenericType<List<Stock>>() {
    });
}

Answer 2

由于某些原因，GenericType修复程序不起作用。但是，由于类型擦除是针对集合而不是针对阵列完成的，所以这很有效。

    @GET
    @Produces(MediaType.APPLICATION_XML)
    public Response getEvents(){
        List<Event> events = eventService.getAll();
        return Response.ok(events.toArray(new Event[events.size()])).build();
    }

Answer 3

我使用AsyncResponse的方法的解决方案

@GET
@Produces({MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
public void list(@Suspended
        final AsyncResponse asyncResponse) {
    asyncResponse.setTimeout(10, TimeUnit.SECONDS);
    executorService.submit(() -> {
        List<Product> res = super.listProducts();
        Product[] arr = res.toArray(new Product[res.size()]);
        asyncResponse.resume(arr);
    });
}

泽西岛可以生成List <t>但不能Response.ok（List <t>）。build（）？</t> </t>

3 个答案: