JAX-RS和AngularJS之间的请求和响应

Hi I have a simple Rest service:

嗨，我有一个简单的休息服务：

    @POST
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
public Product createProduct(Product product) {
    if (!(productDao.findByName(product.getProductName()).isEmpty())) {
                //?????
    } else {
        productDao.create(product);
                //?????
    }
    return product;
}

When input name is incorrect and method findByName return not null I want return from my rest service method to angular only information, example "Product exist". When method findByName return null and product is created I want return Product from my method to Angular controller. How handle it? Return entity and information?

当输入名称不正确并且方法findByName返回非null时，我希望从我的rest服务方法返回到仅角度信息，例如“Product exists”。当方法findByName返回null并且创建了product时，我想从我的方法返回Product到Angular controller。如何处理？返回实体和信息？

And what I handle it in my angular controller? Below controller wokrs good when I return entity, but I don't now why handle information "Product exist" not entity?

我在角度控制器中处理它的是什么？当我返回实体时，控制器下面很好，但我现在不知道为什么处理信息“产品存在”而不是实体？

            $scope.addProduct = function (product) {
            $http.post(serviceURI + "products", product).success(function (data) {
                $scope.products.push(data);
                $('.success-message').fadeIn(1000).delay(5000).fadeOut(1000);
                $scope.message = "Product added";
            }).error(function (error) {
                $('.error-message').fadeIn(1000).delay(5000).fadeOut(1000);
                $scope.message = "Error";
            });
        }

How is the best practice to return data and information from JAX-RS and get it in Angular controller?

从JAX-RS返回数据和信息并在Angular控制器中获取它的最佳实践如何？

2 个解决方案

#1

In my case, I use JAX-RS for the input and Gson for the output when the response is ok because I need to manipulate dates (long/Calendar) and with Gson is easy to add adapters. When the response is not ok, I return a status error code.

在我的情况下，当响应正常时，我使用JAX-RS作为输入，使用Gson作为输出，因为我需要操作日期（长/日历）并且使用Gson很容易添加适配器。当响应不正常时，我返回状态错误代码。

 @POST
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
public Product createProduct(Product product) {
    try {
        Gson gson = new GsonBuilder()
        //.registerTypeAdapter(Calendar.class, new CalendarSerializer())
        //          .registerTypeAdapter(Calendar.class, new CalendarDeserializer())
        //          .registerTypeAdapter(GregorianCalendar.class,
        //                  new CalendarSerializer())
                            .create();

        String json = null;

        //do something

        json = gson.toJson(product);
        return Response.ok(json, MediaType.APPLICATION_JSON).build();


        }catch (IllegalArgumentException ex){
            return Response.serverError().status(Status.BAD_REQUEST).build();

        }catch (Exception ex) {
            return Response.serverError().status(Status.INTERNAL_SERVER_ERROR).build();
        }
        finally{
    }
}

Client with AngularJs:

使用AngularJs的客户：

.success (function(data) {
        //ok -> get data

})
.error (function(resp) {
    if (resp.errorCode == 400){
        ...
    }
    ...
    ...
}

#2

Since RESTFul webservices work with the HTTP vocabulary I suggest to return different HTTP status codes depending on the outcome of your operations.

由于RESTFul webservices使用HTTP词汇表，我建议根据您的操作结果返回不同的HTTP状态代码。

In the first case you could throw a WebApplicationException with a status code of the 4xx family.

在第一种情况下，您可以抛出WebApplicationException，其状态代码为4xx系列。

In the second case you could use the default status code (I think it would be 200 in this case) or provide a more specific status code such as 201 (Created) by returning a Response object instead of a Product directly. Eg. Response.created might help you.

在第二种情况下，您可以使用默认状态代码（我认为在这种情况下它将是200）或通过直接返回Response对象而不是Product来提供更具体的状态代码，例如201（Created）。例如。 Response.created可能对你有所帮助。

https://en.wikipedia.org/wiki/List_of_HTTP_status_codes

http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html

#1

 @POST
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
public Product createProduct(Product product) {
    try {
        Gson gson = new GsonBuilder()
        //.registerTypeAdapter(Calendar.class, new CalendarSerializer())
        //          .registerTypeAdapter(Calendar.class, new CalendarDeserializer())
        //          .registerTypeAdapter(GregorianCalendar.class,
        //                  new CalendarSerializer())
                            .create();

        String json = null;

        //do something

        json = gson.toJson(product);
        return Response.ok(json, MediaType.APPLICATION_JSON).build();


        }catch (IllegalArgumentException ex){
            return Response.serverError().status(Status.BAD_REQUEST).build();

        }catch (Exception ex) {
            return Response.serverError().status(Status.INTERNAL_SERVER_ERROR).build();
        }
        finally{
    }
}