September 2024
Intermediate to advanced
638 pages
16h 6m
German
Content preview from Java Kochbuch, 4. Auflage
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Kapitel 14. Verarbeitung von JSON-Daten
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14.0 Einleitung
JSON (JavaScript Object Notation) steht für alle der folgenden Begriffe:
-
Ein einfaches, leichtgewichtiges Format für den Datenaustausch.
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Eine einfachere, leichtere Alternative zu XML.
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Einfach zu erstellen mit
println()oder mit einer der verschiedenen APIs. -
Wird direkt vom JavaScript-Parser in allen Webbrowsern erkannt.
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Unterstützt werden Add-on-Frameworks für alle gängigen Sprachen (Java, C/C++, Perl, Ruby, Python, Lua, Erlang, Haskell, um nur einige zu nennen); eine lächerlich lange Liste der unterstützten Sprachen (darunter allein zwei Dutzend Parser für Java) findest du direkt auf der Homepage.
Eine einfache JSON-Nachricht könnte wie folgt aussehen:
json/src/main/resources/json/softwareinfo.json/
{"name":"robinparse","version":"1.2.3","description":"Another Parser for JSON","className":"RobinParse","contributors":["Robin Smythe","Jon Jenz","Jan Ardann"]}
Wie du siehst, ist die Syntax einfach, verschachtelbar und für den Menschen leicht zu überprüfen.
Die JSON-Homepage bietet eine knappe Zusammenfassung der JSON-Syntax. Es gibt zwei Arten von Strukturen: JSON-Objekte (Maps) und JSON-Arrays (Listen). JSON-Objekte sind Mengen von Namens- und Wertepaaren, die entweder als java.util.Map oder als Eigenschaften eines Java-Objekts dargestellt werden können. ...
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