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Merge pull request #4 from coderolls/parse-json-in-java
Add examples for How to parse json in java blog
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‎java-json/parse-json-in-java/ParseJSONUsingGSON.java

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package com.coderolls.JSONExample;
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import com.google.gson.Gson;
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import com.google.gson.JsonArray;
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import com.google.gson.JsonObject;
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/**
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* A program to parse JSON strin in Java using Gson
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* @author Gaurav Kukade at coderolls.com
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*/
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public class ParseJSONUsingGSON {
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public static void main(String[] args) {
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//take json as string
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String jsonString = "{"
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+ " \"name\": \"coderolls\","
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+ " \"type\": \"blog\","
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+ " \"address\": {"
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+ " \"street\": \"1600 Pennsylvania Avenue NW\","
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+ " \"city\": \"Washington\","
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+ " \"state\": \"DC\""
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+ " },"
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+ " \"employees\": ["
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+ " {"
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+ " \"firstName\": \"John\","
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+ " \"lastName\": \"Doe\""
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+ " },"
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+ " {"
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+ " \"firstName\": \"Anna\","
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+ " \"lastName\": \"Smith\""
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+ " },"
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+ " {"
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+ " \"firstName\": \"Peter\","
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+ " \"lastName\": \"Jones\""
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+ " }"
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+ " ]"
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+ "}";
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System.out.println("Parsing the json string in java using Gson......\n");
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Gson gson = new Gson();
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//get json object from the json string
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JsonObject coderollsJsonObject = gson.fromJson(jsonString, JsonObject.class);
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//now we can access the values
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String name = coderollsJsonObject.get("name").getAsString();
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System.out.println("Name: "+name+"\n");
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//we can get the JSON object present as value of any key in the parent JSON
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JsonObject addressJsonObject = coderollsJsonObject.get("address").getAsJsonObject();
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//access the values of the addressJSONObject
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String street = addressJsonObject.get("street").getAsString();
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System.out.println("Street: "+street+"\n");
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//we can get the json array present as value of any key in the parent JSON
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JsonArray employeesJsonArray = coderollsJsonObject.get("employees").getAsJsonArray();
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System.out.println("Printing the employess json array: \n"+employeesJsonArray.toString()+"\n");
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//we can get individual json object at an index from the employeesJSONArray
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JsonObject employeeJsonObject = employeesJsonArray.get(0).getAsJsonObject();
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String firstName = employeeJsonObject.get("firstName").getAsString();
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System.out.println("First Name of the employee at index 0: "+firstName);
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}
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}

‎java-json/parse-json-in-java/ParseJSONUsingJSONJava.java

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package com.coderolls.JSONExample;
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import org.json.JSONArray;
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import org.json.JSONObject;
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/**
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* A program to parse JSON strin in Java using json-simple
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* @author Gaurav Kukade at coderolls.com
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*/
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public class ParseJSONUsingJSONJava {
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public static void main(String[] args) {
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//take json as string
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String jsonString = "{"
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+ " \"name\": \"coderolls\","
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+ " \"type\": \"blog\","
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+ " \"address\": {"
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+ " \"street\": \"1600 Pennsylvania Avenue NW\","
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+ " \"city\": \"Washington\","
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+ " \"state\": \"DC\""
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+ " },"
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+ " \"employees\": ["
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+ " {"
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+ " \"firstName\": \"John\","
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+ " \"lastName\": \"Doe\""
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+ " },"
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+ " {"
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+ " \"firstName\": \"Anna\","
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+ " \"lastName\": \"Smith\""
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+ " },"
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+ " {"
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+ " \"firstName\": \"Peter\","
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+ " \"lastName\": \"Jones\""
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+ " }"
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+ " ]"
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+ "}";
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System.out.println("Parsing the json string in java using JSON-Java......\n");
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//add jsonString to the constructor
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JSONObject coderollsJSONObject = new JSONObject(jsonString);
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//now we can access the values
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String name = coderollsJSONObject.getString("name");
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System.out.println("Name: "+name+"\n");
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//we can get the JSON object present as value of any key in the parent JSON
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JSONObject addressJSONObject = coderollsJSONObject.getJSONObject("address");
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//access the values of the addressJSONObject
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String street = addressJSONObject.getString("street");
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System.out.println("Street: "+street+"\n");
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//we can get the json array present as value of any key in the parent JSON
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JSONArray employeesJSONArray = coderollsJSONObject.getJSONArray("employees");
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System.out.println("Printing the employess json array: \n"+employeesJSONArray.toString()+"\n");
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//we can get individual json object at an index from the employeesJSONArray
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JSONObject employeeJSONObject = employeesJSONArray.getJSONObject(0);
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String firstName = employeeJSONObject.getString("firstName");
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System.out.println("First Name of the employee at index 0: "+firstName);
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}
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}

‎java-json/parse-json-in-java/ParseJSONUsingJsonSimple.java

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package com.coderolls.JSONExample;
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import org.json.simple.JSONArray;
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import org.json.simple.JSONObject;
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import org.json.simple.parser.JSONParser;
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import org.json.simple.parser.ParseException;
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/**
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* A program to parse JSON strin in Java using json-simple
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* @author Gaurav Kukade at coderolls.com
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*/
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public class ParseJSONUsingJsonSimple {
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public static void main(String[] args) {
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//take json as string
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String jsonString = "{"
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+ " \"name\": \"coderolls\","
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+ " \"type\": \"blog\","
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+ " \"address\": {"
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+ " \"street\": \"1600 Pennsylvania Avenue NW\","
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+ " \"city\": \"Washington\","
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+ " \"state\": \"DC\""
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+ " },"
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+ " \"employees\": ["
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+ " {"
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+ " \"firstName\": \"John\","
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+ " \"lastName\": \"Doe\""
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+ " },"
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+ " {"
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+ " \"firstName\": \"Anna\","
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+ " \"lastName\": \"Smith\""
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+ " },"
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+ " {"
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+ " \"firstName\": \"Peter\","
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+ " \"lastName\": \"Jones\""
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+ " }"
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+ " ]"
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+ "}";
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System.out.println("Parsing the json string in java using json-simple......\n");
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JSONParser parser = new JSONParser();
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JSONObject coderollsJSONObject = new JSONObject();
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try {
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coderollsJSONObject = (JSONObject) parser.parse(jsonString);
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} catch (ParseException e) {
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e.printStackTrace();
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}
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//now we can access the values
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String name = (String) coderollsJSONObject.get("name");
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System.out.println("Name: "+name+"\n");
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//we can get the JSON object present as value of any key in the parent JSON
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JSONObject addressJSONObject = (JSONObject) coderollsJSONObject.get("address");
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//access the values of the addressJSONObject
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String street = (String) addressJSONObject.get("street");
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System.out.println("Street: "+street+"\n");
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//we can get the json array present as value of any key in the parent JSON
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JSONArray employeesJSONArray = (JSONArray) coderollsJSONObject.get("employees");
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System.out.println("Printing the employess json array: \n"+employeesJSONArray.toString()+"\n");
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//we can get individual json object at an index from the employeesJSONArray
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JSONObject employeeJSONObject = (JSONObject) employeesJSONArray.get(0);
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String firstName = (String) employeeJSONObject.get("firstName");
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System.out.println("First Name of the employee at index 0: "+firstName);
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}
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}

‎java-json/parse-json-in-java/pom.xml

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.coderolls</groupId>
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<artifactId>JSONExample</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<packaging>jar</packaging>
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<name>JSONExample</name>
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<url>http://maven.apache.org</url>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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</properties>
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<dependencies>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>3.8.1</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.json</groupId>
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<artifactId>json</artifactId>
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<version>20201115</version>
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</dependency>
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<dependency>
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<groupId>com.google.code.gson</groupId>
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<artifactId>gson</artifactId>
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<version>2.8.6</version>
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</dependency>
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<!-- https://mvnrepository.com/artifact/com.googlecode.json-simple/json-simple -->
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<dependency>
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<groupId>com.googlecode.json-simple</groupId>
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<artifactId>json-simple</artifactId>
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<version>1.1.1</version>
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</dependency>
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</dependencies>
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</project>

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