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Java-JSON-Jackson

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Srilatha Kante
Srilatha Kante

This document discusses JSON and Java integration using Jackson. It provides an introduction to JSON, its syntax and compatibility with other languages. It then covers how to use Jackson annotations to serialize and deserialize Java objects to and from JSON. The document also discusses JSON parsing, schema, and how to integrate JSON with Java technologies like MuleSoft.

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Java-JSON-Jackson Srilatha Kante
Agenda Introduction to JSON JSON and Java Jackson Annotations Introduction to XML XML to JSON
Introduction to JSON JSON Java Script Object Notation JSON is a data interchange format Interactive Web 2.0 applications, no more use page replacement. Data transfer without refreshing a page. The most important aspects of data transfer are simplicity, extensibility, interoperability, openness and human readability Key idea in AJAX Asynchronous Java Script and XML
Syntax of JSON JSON is unstructured Data is in name/value pairs Data is separated by commas Curly braces hold objects Square brackets hold arrays
Simplicity of JSON JSON is a subset of Java Script. JSON can be parsed by a Java Script parser. It can represent either complex or simple data as it has data types They are Strings, Number, Boolean, Objects and Arrays
JSON Compatibility Array ["Sunday", "Monday", "Tuesday", "Wednesday] "employees":[ {"firstName":"John", "lastName":"Doe"}, {"firstName":"Anna", "lastName":"Smith"}, {"firstName":"Peter","lastName":"Jones"} ] Object { firstname": Santhosh ", lastname": Gowd} All data types are intuitive and similar to other programming languages Also compatible with other languages like C, C++, C#, ColdFusion, Python and many more.
JSON in AJAX JSON in AJAX Part of HTML Tags <html>... <script> var data = JSONdata; </script>... </html> JSON in JavaScript XMLHttpRequest responseData = eval('(' + responseText + ')');
Mapping
Encoding JSON in Java
Decoding Java in JSON
JSON Schema JSON Schema is a specification for JSON based format for defining the structure of JSON data It was written under IETF draft which expired in 2011 Describes your existing data format. Clear, human- and machine-readable documentation. Complete structural validation, useful for automated testing. Complete structural validation, validating client-submitted data. Currently the most complete and compliant JSON Schema validator available is JSV
Parsing JSON Streaming Tree Traversing Data Binding
Jackson Annotations
Jackson Overview Jackson is a simple Java-based library to serialize Java objects to JSON and vice versa Features of Jackson Easy to use Jackson API provides a high-level facade to simplify commonly used use-cases. No need to create mapping Jackson API provides default mapping for most of the objects to be serialized. Performance Jackson is quite fast, consumes less memory space, and is suitable for large object graphs or systems. Clean JSON Jackson creates clean and compact JSON results which are easy to read. No Dependency Jackson library does not require any other library apart from JDK. Open Source Jackson library is open source and free to use
Set up Jackson Environment Nothing specific for Jackson Install JDK and make sure path and classpath are set Download jackson-all-1.9.0.jar Make sure this file is in the classpath in libraries
Follow these steps Step1 : Create ObjectMapper Object ObjectMapper mapper = new ObjectMapper(); Step 2: Deserialize JSON to Object //Object to JSON Conversion Student student = mapper.readValue(jsonString, Student.class); Step 3: Serialize Object to JSON jsonString = mapper.writeValueAsString(student);
Jackson - Data Binding Simple Data Binding It converts JSON to and from Java Maps, Lists, Strings, Numbers, Booleans, and null objects. Full Data Binding It converts JSON to and from any Java type.
Jackson Serialization Annotations @JsonAnyGetter @JsonGetter @JsonPropertyOrder @JsonRawValue @JsonValue @JsonRootName @JsonSerialize
Jackson Deserialization Annotations @JsonCreator @JsonProperty @JacksonInject @JsonAnySetter @JsonSetter @JsonDeserialize
Jackson Property Inclusion Annotations @JsonIgnoreProperties @JsonIgnore @JsonIgnoreType @JsonInclude @JsonAutoDetect
Jackson General Annotations @JsonProperty @JsonFormat @JsonUnwrapped @JsonView @JsonManagedReference @JsonBackReference @JsonIdentityInfo @JsonFilter
MuleSoft Transformers Built In APIs Global Mappers JSON to Java Java to JSON Mixin Class Mapping as inbound properties
JSON in Mule JSON The JSON transformers are in the org.mule.module.json.transformers package. They provide the ability to work with JSON documents and bind them automatically to Java objects
Mule Components and Transformers
Resources www.json.org http://www.w3schools.com/json/json_intro.a sp http://www.tutorialspoint.com/json/index.ht m http://www.tutorialspoint.com/jackson/jackso n_quick_guide.htm http://www.baeldung.com/jackson- annotations

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Java-JSON-Jackson

  • 2. Agenda Introduction to JSON JSON and Java Jackson Annotations Introduction to XML XML to JSON
  • 3. Introduction to JSON JSON Java Script Object Notation JSON is a data interchange format Interactive Web 2.0 applications, no more use page replacement. Data transfer without refreshing a page. The most important aspects of data transfer are simplicity, extensibility, interoperability, openness and human readability Key idea in AJAX Asynchronous Java Script and XML
  • 4. Syntax of JSON JSON is unstructured Data is in name/value pairs Data is separated by commas Curly braces hold objects Square brackets hold arrays
  • 5. Simplicity of JSON JSON is a subset of Java Script. JSON can be parsed by a Java Script parser. It can represent either complex or simple data as it has data types They are Strings, Number, Boolean, Objects and Arrays
  • 6. JSON Compatibility Array ["Sunday", "Monday", "Tuesday", "Wednesday] "employees":[ {"firstName":"John", "lastName":"Doe"}, {"firstName":"Anna", "lastName":"Smith"}, {"firstName":"Peter","lastName":"Jones"} ] Object { firstname": Santhosh ", lastname": Gowd} All data types are intuitive and similar to other programming languages Also compatible with other languages like C, C++, C#, ColdFusion, Python and many more.
  • 7. JSON in AJAX JSON in AJAX Part of HTML Tags <html>... <script> var data = JSONdata; </script>... </html> JSON in JavaScript XMLHttpRequest responseData = eval('(' + responseText + ')');
  • 11. JSON Schema JSON Schema is a specification for JSON based format for defining the structure of JSON data It was written under IETF draft which expired in 2011 Describes your existing data format. Clear, human- and machine-readable documentation. Complete structural validation, useful for automated testing. Complete structural validation, validating client-submitted data. Currently the most complete and compliant JSON Schema validator available is JSV
  • 12. Parsing JSON Streaming Tree Traversing Data Binding
  • 14. Jackson Overview Jackson is a simple Java-based library to serialize Java objects to JSON and vice versa Features of Jackson Easy to use Jackson API provides a high-level facade to simplify commonly used use-cases. No need to create mapping Jackson API provides default mapping for most of the objects to be serialized. Performance Jackson is quite fast, consumes less memory space, and is suitable for large object graphs or systems. Clean JSON Jackson creates clean and compact JSON results which are easy to read. No Dependency Jackson library does not require any other library apart from JDK. Open Source Jackson library is open source and free to use
  • 15. Set up Jackson Environment Nothing specific for Jackson Install JDK and make sure path and classpath are set Download jackson-all-1.9.0.jar Make sure this file is in the classpath in libraries
  • 16. Follow these steps Step1 : Create ObjectMapper Object ObjectMapper mapper = new ObjectMapper(); Step 2: Deserialize JSON to Object //Object to JSON Conversion Student student = mapper.readValue(jsonString, Student.class); Step 3: Serialize Object to JSON jsonString = mapper.writeValueAsString(student);
  • 17. Jackson - Data Binding Simple Data Binding It converts JSON to and from Java Maps, Lists, Strings, Numbers, Booleans, and null objects. Full Data Binding It converts JSON to and from any Java type.
  • 18. Jackson Serialization Annotations @JsonAnyGetter @JsonGetter @JsonPropertyOrder @JsonRawValue @JsonValue @JsonRootName @JsonSerialize
  • 19. Jackson Deserialization Annotations @JsonCreator @JsonProperty @JacksonInject @JsonAnySetter @JsonSetter @JsonDeserialize
  • 20. Jackson Property Inclusion Annotations @JsonIgnoreProperties @JsonIgnore @JsonIgnoreType @JsonInclude @JsonAutoDetect
  • 21. Jackson General Annotations @JsonProperty @JsonFormat @JsonUnwrapped @JsonView @JsonManagedReference @JsonBackReference @JsonIdentityInfo @JsonFilter
  • 22. MuleSoft Transformers Built In APIs Global Mappers JSON to Java Java to JSON Mixin Class Mapping as inbound properties
  • 23. JSON in Mule JSON The JSON transformers are in the org.mule.module.json.transformers package. They provide the ability to work with JSON documents and bind them automatically to Java objects
  • 24. Mule Components and Transformers
  • 25. Resources www.json.org http://www.w3schools.com/json/json_intro.a sp http://www.tutorialspoint.com/json/index.ht m http://www.tutorialspoint.com/jackson/jackso n_quick_guide.htm http://www.baeldung.com/jackson- annotations