[英]RESTful Webservices return types
I am new to webservices in Java. 我是Java新手。 and I am writing web services using JAX-RS implementation Jersey .
并且我正在使用JAX-RS实现Jersey编写Web服务。
I'd like to know: 我想知道:
Which return types are possible for web service methods? Web服务方法可能有哪些返回类型?
As far as I know you can't use primitive types as return type for web service method.. why so? 据我所知,您不能使用原始类型作为Web服务方法的返回类型。为什么这样?
Read Chapter 8: JAX-RS Entity Providers in the Jersey docs. 阅读Jersey文档中的第8章:JAX-RS实体提供程序 。 It explains how (de)serialization is done in Jersey.
它说明了在Jersey中如何进行反序列化。 It explains the use of
MessageBodyReader
s and MessageBodyWriter
s to transform the data to and from Java object to serialized streams. 它解释了如何使用
MessageBodyReader
和MessageBodyWriter
将数据与Java对象之间的数据转换为序列化流。
At the end of the chapter, you will see the default providers that Jersey comes with out of the box 在本章的最后,您将看到开箱即用的默认提供程序。
byte[] (*/*)
String (*/*)
InputStream (*/*)
Reader (*/*)
File (*/*)
DataSource (*/*)
Source (text/xml, application/xml and media types of the form application/*+xml)
JAXBElement (text/xml, application/xml and media types of the form application/*+xml)
MultivaluedMap<K,V> (application/x-www-form-urlencoded)
Form (application/x-www-form-urlencoded)
StreamingOutput ((*/*)) - this class can be used as an lightweight MessageBodyWriter<T> that can be returned from a resource method
Boolean, Character and Number (text/plain) - corresponding primitive types supported via boxing/unboxing conversion
Aside from the basic providers, Jersey also has some non default providers for handling things like JSON to POJO (and vise versa) conversion and handling Multipart. 除了基本提供程序之外,Jersey还具有一些非默认提供程序,用于处理从JSON到POJO(反之亦然)的转换以及处理Multipart。 You can read more about these in Chapter 9 .
您可以在第9章中详细了解这些内容。 If there is a not a provider to handle our conversion needs, then we can also just write our own reader or writer to handle it.
如果没有提供者来处理我们的转换需求,那么我们也可以只编写自己的读取器或写入器来处理它。
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