Weblog for the AMIS Technology corner
Posts tagged REST
No JDBC based data retrieval in Java applications – RESTstyle, JSON formatted HTTP based interaction from Java to Database
Jan 30th
This article demonstrates how Java application can query data from relational databases (well, in this case more specifically the Oracle RDBMS) without the use of plain old JDBC but instead through a simple HTTP interaction with a RESTful service that returns the data in JSON format.
In this way, issues with JDBC drivers, database connections, data sources and firewall and other network complications are avoided and the Java application does not contain a single bit of SQL.
This article will demonstrate how easy it is to set up the RESTful API from the database – using Oracle’s dbms_epg package – and how this API can be accessed from Java using JAX-RS (Jersey) and the json-lib utility library.
This topic is one of many to be discussed in Friday’s (4th February) Masterclass on Leveraging the Oracle Database in Java Application (some seats are available – go to http://www.amis.nl/trainingen/oracle-database-in-java-applications for registration and details).
First Steps with RestLet 1.1RC2 in JDeveloper 11g – restful services 101
Oct 11th
WebServices are hot. Some more so than others. SOAP based WebServices are frequently seen as not very lean and agile. Robust – perhaps. Widely supported – no doubt about it. Key element of almost any SOA infrastructure – sure. Easy, lightweight to deploy or to program a client against – no, not really. Inituitive? Bookmarkable? Addressable? – none of those. Restful web-services are the easy to use, lightweight, navigation oriented complement to the more heavy weight WS* SOAP based web services. REST is the natural extension of HTTP – leveraging a lot of its potential in a very direct way. REST services focus on Resources – that are searched & retrieved, created, updated and deleted. Resources can refer to each other – through hyperlinks that equal new REST service calls. The representation of Resources – the format of the response received or sent by a client has to be agreed upon; it usually is XHTML, XML or plain text.
Under JSR-311, a formal specification for REST is being developed, with project Jersey – nearing its completion – the reference implementation. An even more mature Java project for RESTful services is RestLet – a fairly easy to use library that allows for easy publication of Restful services. Its main job is interpreting the URIs in requests sent to the server/service and routing them to the appropriate resource handler and more particularly the right method depending on the nature – GET, POST/PUT, DELETE – of the HTTP request.
In this article I will demonstrate a very first introduction to the use of RestLet with JDeveloper 11g.
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