Web service and Its integration in Android - By Paresh Mayani (@pareshmayani) Internet Database Database Web Services

Web service? • The W3C defines a “web service” as “a software system designed to support interoperable machine-to-machine interaction over a network.

Request Sending data like Name, Address Method GET, POST Response Receiving data FORMAT XML / JSON

Categories of web service • SOAP Web Service • RESTful Web Service

Soap Web Service • Simple Object Access Protocol • An XML-based messaging protocol. • Communication between the web service and client happens using XML messages • SOAP defines the rules for communication like what are all the tags that should be used in XML and their meaning.

RESTful Web Service • Representational State Transfer (REST) • Describe an architecture style of networked systems. • An Architectural Style, Not a Standard • It uses architectures that use HTTP or similar protocols by restricting the interface to use standard operations like GET, POST, PUT, DELETE for HTTP

Goodbye SOAP – Welcome JSON REST • Lightweight - not a lot of extra xml markup • Human Readable Results

JSON • JavaScript Object Notation • It is a lightweight data-interchange format. • It is easy for humans to read and write. • It is easy for machines to parse and generate. JSON is built on two structures: • A collection of name/value pairs. In various languages, this is realized as an object, record, struct, dictionary, hash table, keyed list, or associative array. • An ordered list of values. In most languages, this is realized as an array, vector, list, or sequence. • Reference: http://www.json.org/

JSON Structure JSON Object JSON Array http://www.technotalkative.com/android-json-parsing/

+ HTTP • Option 1: java.net.URL; java.net.HttpURLConnection; • Option 2: HTTPClient API

HttpClient API

Request

Request

No Request

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