An introduction to JAX-RS and JAXB-优快云博客

本文链接：https://blog.youkuaiyun.com/wonderfan/article/details/8681462

本文深入探讨了Java JAX-RS规范及其实现方式，通过Jersey作为参考实现，阐述了如何构建RESTful Web Services。重点介绍了使用注解定义REST相关性的Java类，服务器端的Servlet扫描预定义类识别RESTful资源，以及如何通过web.xml配置文件注册Servlet。此外，文章还涉及了JAXB用于XML和JSON的创建，以及如何利用Java对象与XML文档之间的转换。

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Java defines REST support via the Java Specification Request 311 (JSR). This specificiation is called JAX-RS (The Java API for RESTful Web Services). JAX-RS uses annotations to define the REST relevance of Java classes.

Jersey is the reference implementation for this specification. Jersey contains basically a REST server and a REST client. The core client can be used provides a library to communicate with the server.

On the server side Jersey uses a servlet which scans predefined classes to identify RESTful resources. Via the web.xml configuration file for your web application, registers this servlet which is provided by the Jersey distribution

This servlet analyzes the incoming HTTP request and selects the correct class and method to respond to this request. This selection is based on annotations in the class and methods.

A REST web application consists therefore out of data classes (resources) and services. These two types are typically maintained in different packages as the Jersey servlet will be instructed via the web.xml to scan certain packages for data classes.

JAX-RS supports the creation of XML and JSON via the Java Architecture for XML Binding (JAXB).

Java Architecture for XML Binding (JAXB) is a Java standard that defines how Java objects are converted from and to XML. It uses a standard set of mappings.

JAXB defines an API for reading and writing Java objects to and from XML documents.

As JAXB is defined via a specification, it is possible to use different implementations for this standard. JAXB defines a service provider which allows the selection of the JAXB implementation.