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Complete Code Example

/pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<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>com.in28minutes.rest.webservices</groupId>
	<artifactId>restful-web-services</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>restful-web-services</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.0.RELEASE</version>
		<relativePath /> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-jpa</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-devtools</artifactId>
			<scope>runtime</scope>
		</dependency>

		<dependency>
			<groupId>com.h2database</groupId>
			<artifactId>h2</artifactId>
			<scope>runtime</scope>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

	<repositories>
		<repository>
			<id>spring-snapshots</id>
			<name>Spring Snapshots</name>
			<url>https://repo.spring.io/snapshot</url>
			<snapshots>
				<enabled>true</enabled>
			</snapshots>
		</repository>
		<repository>
			<id>spring-milestones</id>
			<name>Spring Milestones</name>
			<url>https://repo.spring.io/milestone</url>
			<snapshots>
				<enabled>false</enabled>
			</snapshots>
		</repository>
	</repositories>

	<pluginRepositories>
		<pluginRepository>
			<id>spring-snapshots</id>
			<name>Spring Snapshots</name>
			<url>https://repo.spring.io/snapshot</url>
			<snapshots>
				<enabled>true</enabled>
			</snapshots>
		</pluginRepository>
		<pluginRepository>
			<id>spring-milestones</id>
			<name>Spring Milestones</name>
			<url>https://repo.spring.io/milestone</url>
			<snapshots>
				<enabled>false</enabled>
			</snapshots>
		</pluginRepository>
	</pluginRepositories>


</project>

/src/main/java/com/in28minutes/rest/webservices/restfulwebservices/helloworld/HelloWorldBean.java

package com.in28minutes.rest.webservices.restfulwebservices.helloworld;

public class HelloWorldBean {

	private String message;

	public HelloWorldBean(String message) {
		this.message = message;
	}

	public String getMessage() {
		return message;
	}

	public void setMessage(String message) {
		this.message = message;
	}

	@Override
	public String toString() {
		return String.format("HelloWorldBean [message=%s]", message);
	}

}

/src/main/java/com/in28minutes/rest/webservices/restfulwebservices/helloworld/HelloWorldController.java

package com.in28minutes.rest.webservices.restfulwebservices.helloworld;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

//Controller
@RestController
public class HelloWorldController {

	@GetMapping(path = "/hello-world")
	public String helloWorld() {
		return "Hello World";
	}

	@GetMapping(path = "/hello-world-bean")
	public HelloWorldBean helloWorldBean() {
		return new HelloWorldBean("Hello World");
	}
	
	///hello-world/path-variable/in28minutes
	@GetMapping(path = "/hello-world/path-variable/{name}")
	public HelloWorldBean helloWorldPathVariable(@PathVariable String name) {
		return new HelloWorldBean(String.format("Hello World, %s", name));
	}
	
}

/src/main/java/com/in28minutes/rest/webservices/restfulwebservices/RestfulWebServicesApplication.java

package com.in28minutes.rest.webservices.restfulwebservices;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class RestfulWebServicesApplication {

	public static void main(String[] args) {
		SpringApplication.run(RestfulWebServicesApplication.class, args);
	}
}

/src/main/java/com/in28minutes/rest/webservices/restfulwebservices/user/User.java

package com.in28minutes.rest.webservices.restfulwebservices.user;

import java.util.Date;

public class User {

	private Integer id;

	private String name;

	private Date birthDate;

	public User(Integer id, String name, Date birthDate) {
		super();
		this.id = id;
		this.name = name;
		this.birthDate = birthDate;
	}

	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public Date getBirthDate() {
		return birthDate;
	}

	public void setBirthDate(Date birthDate) {
		this.birthDate = birthDate;
	}

	@Override
	public String toString() {
		return String.format("User [id=%s, name=%s, birthDate=%s]", id, name, birthDate);
	}

}

/src/main/java/com/in28minutes/rest/webservices/restfulwebservices/user/UserDaoService.java

package com.in28minutes.rest.webservices.restfulwebservices.user;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.springframework.stereotype.Component;

@Component
public class UserDaoService {
	private static List<User> users = new ArrayList<>();

	private static int usersCount = 3;

	static {
		users.add(new User(1, "Adam", new Date()));
		users.add(new User(2, "Eve", new Date()));
		users.add(new User(3, "Jack", new Date()));
	}

	public List<User> findAll() {
		return users;
	}

	public User save(User user) {
		if (user.getId() == null) {
			user.setId(++usersCount);
		}
		users.add(user);
		return user;
	}

	public User findOne(int id) {
		for (User user : users) {
			if (user.getId() == id) {
				return user;
			}
		}
		return null;
	}

}

/src/main/java/com/in28minutes/rest/webservices/restfulwebservices/user/UserResource.java

package com.in28minutes.rest.webservices.restfulwebservices.user;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class UserResource {

	@Autowired
	private UserDaoService service;

	@GetMapping("/users")
	public List<User> retrieveAllUsers() {
		return service.findAll();
	}

	@GetMapping("/users/{id}")
	public User retrieveUser(@PathVariable int id) {
		return service.findOne(id);
	}

}

/src/main/resources/application.properties

logging.level.org.springframework = info
#This is not really needed as this is the default after 2.0.0.RELEASE
spring.jackson.serialization.write-dates-as-timestamps=false
spring.messages.basename=messages

/src/test/java/com/in28minutes/rest/webservices/restfulwebservices/RestfulWebServicesApplicationTests.java

package com.in28minutes.rest.webservices.restfulwebservices;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@SpringBootTest
public class RestfulWebServicesApplicationTests {

	@Test
	public void contextLoads() {
	}

}