JSON is a data exchange format alternative for XML.  There are several JSON to Java modules available for download to get started encoding and decoding JSON objects using Java.  These JSON to Java libraries are also known as JSON binders because they allow you to combine JSON with another programming language. There are four major JSON to Java conversion libraries that make coding in JSON with Java comprehensible.

The following JSON to and from Java conversion libraries are available for download:

Developer Library Source
Google GSON https://github.com/google/gson
Yidong Fang JSON.simple https://code.google.com/p/json-simple/
Oracle JSONP https://jsonp.java.net/
FasterXML Jackson https://github.com/FasterXML/jackson

 

The process of decoding or parsing involves translating from JSON to Java and the process of encoding involves translating from Java to JSON. In comparing the parsing speeds, Jackson is the preferred library for handling large JSON files and GSON is suitable for executing many small JSON requests.  If your project involves a combination of both large JSON files and the execution of many small JSON requests, JSON.simple is the most capable of tackling the array of files.

JSON.simple Example

  1. Download JSON.simple.
  2. Create a Java project titled “JSONTutorial”.
  3. Create a sub folder titled “jars”.
    • Right click on the project, click property, click java build path, add jars
  4. Move the “json-simple-1.1.1.jar” file into the sub folder titled “jars”.
  5. Click OK to save changes to the project and close the “Jar Selection” window.
  6. Click OK to save changes and close the “Properties for JSONTutorial”.

To encode JSON to a file follow the code below:

  1. Create a new class named “JSONwritetofile.java” in the “src” sub folder org.json.simple.

 

  1. Confirm the output of the code.

 

To decode JSON to a file follow the code below:  

  1. Create a new class named “JSONwritetofile.java” in the “src” sub folder org.json.simple.

 

  1. Confirm the output of the code.

Tips for using JSON with Java include downloading the most updated version of the JSON library or binder of your choice, practicing neat coding, and importing all of the necessary elements before executing your program.

 

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