[Java] Using Intellij To Work With JSON and Text File

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INTELLIJ PROJECT - Working with JSON and Text File

https://www.jetbrains.com/help/idea/developing-node-js-applications.html#ws_node_quick_start

Create A New Project

Click New Project

Name = prjMvnJsonDataFile Archetype = org.apache.maven.archetypes:maven-archetype-quickstart Click Create.

Note: Maven Quickstart Archetype maven-archetype-quickstart is an archetype which generates a sample Maven project: https://maven.apache.org/archetypes/maven-archetype-quickstart/

Project creation done.

Add Dependency

<dependency>    <groupId>com.fasterxml.jackson.core</groupId>    <artifactId>jackson-core</artifactId>    <version>2.9.6</version> </dependency> <dependency>    <groupId>com.fasterxml.jackson.core</groupId>    <artifactId>jackson-annotations</artifactId>    <version>2.9.6</version> </dependency> <dependency>    <groupId>com.fasterxml.jackson.core</groupId>    <artifactId>jackson-databind</artifactId>    <version>2.9.6</version> </dependency>

Edit Class

package org.example; // Java Program to Illustrate Setting Up of Jackson by // parsing Jackson library json files and // generating the same // Importing required classes import java.io.*; import com.fasterxml.jackson.core.JsonGenerationException; import com.fasterxml.jackson.core.JsonParseException; import com.fasterxml.jackson.databind.JsonMappingException; import com.fasterxml.jackson.databind.ObjectMapper; import java.io.*; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStream; // Main class class App {     // Main driver method     public static void main(String[] args)     {         // Creating an employee object with it's attributes         // set         Employee employee = getEmployee();         ObjectMapper mapper = new ObjectMapper();         // Try block to check for exceptions         try {             // Serializes emp object to a file employee.json             String filePath="c:/ZTIJ//employee.json";             mapper.writeValue(                     new File(                             filePath),                     employee);             // Deserializes emp object in json string format             String empJson                     = mapper.writeValueAsString(employee);             System.out.println(                     "The employee object in json format:"                             + empJson);             System.out.println(                     "Updating the dept of emp object");             // Update deptName attribute of emp object             employee.setDeptName("Devops");             System.out.println(                     "Deserializing updated emp json ");             // Reading from updated json and deserializes it             // to emp object             Employee updatedEmp = mapper.readValue(                     mapper.writeValueAsString(employee),                     Employee.class);             // Print and display the updated employee object             System.out.println("Updated emp object is "                     + updatedEmp.toString());         }         // Catch block to handle exceptions         // Catch block 1         // Handling JsonGenerationException         catch (JsonGenerationException e) {             // Display the exception along with line number             // using printStackTrace() method             e.printStackTrace();         }         // Catch block 2         // Handling JsonmappingException         catch (JsonMappingException e) {             // Display the exception along with line number             // using printStackTrace() method             e.printStackTrace();         }         // Catch block 3         // handling generic I/O exceptions         catch (IOException e) {             // Display the exception along with line number             // using printStackTrace() method             e.printStackTrace();         }     }     // Method 2     // To get the employees     private static Employee getEmployee()     {         // Creating an object of Employee class         Employee emp = new Employee();         emp.setId("E010890");         emp.setName("James");         emp.setDeptName("DBMS");         emp.setRating(5);         emp.setSalary(1000000.00);         // Returning the employee         return emp;     } } // Class 2 // Helper class class Employee {     // Member variables of this class     private String id;     private String name;     private String deptName;     private double salary;     private int rating;     // Member methods of this class     public String getId() { return id; }     public void setId(String id) { this.id = id; }     public String getName() { return name; }     public void setName(String name) { this.name = name; }     public String getDeptName() { return deptName; }     public void setDeptName(String deptName)     {         // This keyword refers to current instance         this.deptName = deptName;     }     public double getSalary() { return salary; }     public void setSalary(double salary)     {         this.salary = salary;     }     public int getRating() { return rating; }     public void setRating(int rating)     {         this.rating = rating;     }     @Override public String toString()     {         return "Employee [id=" + id + ", name=" + name                 + ", deptName=" + deptName + ", salary="                 + salary + ", rating=" + rating + "]";     } }

source: https://www.geeksforgeeks.org/how-to-setup-jackson-in-java-application/

Create an artifact configuration for the JAR

Build the JAR artifact

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