Java Reference
In-Depth Information
of grammar to use, in our case,
XML
Schema
C
, and load the
XSD
schema file in a
Schema
instance
D
. Finally, we can create an
XML
Validator
for our schema and vali-
date the
DOM
document
E
. At this point, we know that our document is valid
and
well formed.
The next step would be to check that the application data is as expected. The
DOM
document
API
can be painful to use, so at this point you have several options. The
JDOM
19
API
is a friendlier interface to
XML
than
DOM
. You can use Java's
XP
ath
20
sup-
port to check the contents of a document. You can also use Sun's
JAXB
21
framework,
although it's not trivial, to transform
XML
into
POJO
s.
Next, let's consider
JSON
as the data format.
13.7.3
Validating a JSON response
JSON
22
(JavaScript Object Notation) is a data-interchange language based on a subset
of the JavaScript Programming Language, Standard
ECMA
-262 3rd Edition, December
1999.
23
Applications use
JSON
instead of
XML
as their data format because it's text
based and easy for people and machines to read and understand. In this first example
in listing 13.12, we show a simple check of a
JSON
document.
Listing 13.12
A JSON service test
private static final String URL_FIXTURE =
@Test
public void testGetJsonBasicCheck() throws IOException {
HttpClient httpClient = new HttpClient();
GetMethod get = new GetMethod(URL_FIXTURE);
String responseString;
try {
httpClient.executeMethod(get);
InputStream input = get.getResponseBodyAsStream();
responseString = IOUtils.toString(input, "UTF-8");
} finally {
get.releaseConnection();
}
String responseNoWs =
StringUtils.deleteWhitespace(responseString);
String response1Line = "{ \"glossary\": { \"title\":
B
➥
\"example glossary\", \"GlossDiv\": { \"title\": \"S\",
➥
\"GlossList\": { \"GlossEntry\": { \"ID\": \"SGML\", \"SortAs\":
➥
\"SGML\", \"GlossTerm\": \"Standard Generalized Markup Language\",
➥
\"Acronym\": \"SGML\", \"Abbrev\": \"ISO 8879:1986\", \"GlossDef\": {
➥
\"para\": \"A meta-markup language, used to create markup languages
19
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