Chapter 24. Examples for Chapter 10
RS to add these principles to your RESTful web services. In this chapter, you'll look through
two different examples. The first shows you how to introduce Atom links into your XML
documents. The second uses Link headers to publish state transitions within a RESTful web
Example ex10_1: Atom Links
pands the CustomerResource RESTful web service so that a client can fetch subsets of the
customer database. If a client does a GET /customers request in our RESTful application, it
will receive a subset list of customers in XML. Two Atom links are embedded in this docu-
ment that allow you to view the next or previous sets of customer data. Example output
<customer id= "3" >
<customer id= "4" >
<link rel= "next"
href="http://example.com/customers?start=5 & size=2"
<link rel= "previous"
href="http://example.com/customers?start=1 & size=2"
The next and previous links are URLs pointing to the same /customers URL, but they
contain URI query parameters indexing into the customer database.
The Server Code
The first bit of code is a JAXB class that maps to the <customers> element. It must be cap-
able of holding an arbitrary number of Customer instances as well as the Atom links for our
next and previous link relationships. We can use the javax.ws.rs.core.Link class with
its JAXB adapter to represent these links: