Spring MVC simple json example

SpringMVCJSON/.gitignore

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+/build/
+/target/
+/Users/
+/.settings/
+/.classpath
+/.project

SpringMVCJSON/WebContent/META-INF/MANIFEST.MF

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+Manifest-Version: 1.0
+Class-Path: 
+

SpringMVCJSON/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"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<groupId>SpringMVCJSON</groupId>
+	<artifactId>SpringMVCJSON</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<packaging>war</packaging>
+	<build>
+		<sourceDirectory>src</sourceDirectory>
+		<plugins>
+			<plugin>
+				<artifactId>maven-war-plugin</artifactId>
+				<version>3.2.1</version>
+				<configuration>
+					<warSourceDirectory>WebContent</warSourceDirectory>
+				</configuration>
+			</plugin>
+			<plugin>
+				<artifactId>maven-compiler-plugin</artifactId>
+				<version>3.7.0</version>
+				<configuration>
+					<source>10</source>
+					<target>10</target>
+				</configuration>
+			</plugin>
+		</plugins>
+	</build>
+
+	<dependencies>
+		<!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
+		<dependency>
+			<groupId>org.springframework</groupId>
+			<artifactId>spring-webmvc</artifactId>
+			<version>5.1.3.RELEASE</version>
+		</dependency>
+
+		<!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
+		<dependency>
+			<groupId>javax.servlet</groupId>
+			<artifactId>javax.servlet-api</artifactId>
+			<version>4.0.1</version>
+		</dependency>
+
+		<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
+		<dependency>
+			<groupId>com.fasterxml.jackson.core</groupId>
+			<artifactId>jackson-databind</artifactId>
+			<version>2.9.8</version>
+		</dependency>
+
+	</dependencies>
+
+</project>

SpringMVCJSON/src/config/DispatcherServletInitializer.java

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+package config;
+
+import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
+
+public class DispatcherServletInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
+
+	@Override
+	protected Class<?>[] getRootConfigClasses() {
+		return null;
+	}
+
+	@Override
+	protected Class<?>[] getServletConfigClasses() {
+		return new Class[] { JavaBasedConfiguration.class };
+	}
+
+	@Override
+	protected String[] getServletMappings() {
+		return new String[] { "/" };
+	}
+
+}

SpringMVCJSON/src/config/JavaBasedConfiguration.java

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+package config;
+
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.servlet.config.annotation.EnableWebMvc;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+
+@Configuration
+@EnableWebMvc
+@ComponentScan(basePackages = { "controller","service" })
+public class JavaBasedConfiguration implements WebMvcConfigurer {
+}

SpringMVCJSON/src/controller/EmployeeController.java

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+package controller;
+
+import java.util.List;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.ResponseBody;
+import org.springframework.web.bind.annotation.RestController;
+
+import model.Employee;
+import service.EmployeeService;
+
+// @Controller
+// @ResponseBody // use @ResponseBody annotation for JSON response.
+
+// or @RestController
+
+@RestController
+@RequestMapping("/employees")
+public class EmployeeController {
+
+	@Autowired
+	private EmployeeService employeeService;
+
+	@RequestMapping
+	public List<Employee> getAllEmployees() {
+		return employeeService.inMemoryData();
+	}
+
+	@RequestMapping(value = "/{id}")
+	public Employee getEmployeeById(@PathVariable("id") int id) {
+		// return employeeService.inMemoryData().stream().filter(e -> e.getId() ==
+		// id).findFirst().get();
+
+		for (Employee e : employeeService.inMemoryData()) {
+			if (e.getId() == id) {
+				return e;
+			}
+		}
+		throw new RuntimeException("Not Found");
+	}
+
+}

SpringMVCJSON/src/model/Employee.java

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+package model;
+
+public class Employee {
+
+	private int id;
+	private String name;
+	private String surname;
+	private int salary;
+
+	public Employee() {
+		super();
+	}
+
+	public Employee(int id, String name, String surname, int salary) {
+		super();
+		this.id = id;
+		this.name = name;
+		this.surname = surname;
+		this.salary = salary;
+	}
+
+	public int getId() {
+		return id;
+	}
+
+	public void setId(int id) {
+		this.id = id;
+	}
+
+	public String getName() {
+		return name;
+	}
+
+	public void setName(String name) {
+		this.name = name;
+	}
+
+	public String getSurname() {
+		return surname;
+	}
+
+	public void setSurname(String surname) {
+		this.surname = surname;
+	}
+
+	public int getSalary() {
+		return salary;
+	}
+
+	public void setSalary(int salary) {
+		this.salary = salary;
+	}
+}

SpringMVCJSON/src/service/EmployeeService.java

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+package service;
+
+import java.util.List;
+
+import org.springframework.stereotype.Service;
+
+import model.Employee;
+
+@Service
+public class EmployeeService {
+
+	public List<Employee> inMemoryData() {
+
+		Employee employee1 = new Employee(1, "name1", "surname1", 1000);
+		Employee employee2 = new Employee(2, "name2", "surname2", 2000);
+		Employee employee3 = new Employee(3, "name3", "surname3", 3000);
+
+		return List.of(employee1, employee2, employee3);
+	}
+}