Task - Spring Boot - FooBar App #59

akash-coded · 2022-05-02T05:08:12Z

akash-coded
May 2, 2022
Maintainer

FooBar application with Spring Boot

Using `@RestController`, `@Component` and `@Bean`

Create a Spring Boot application named spring-boot-foobar-app with the following setup configurations:

The details for creating the Spring Boot project are as follows:

name: spring-boot-foobar-app
group: com.spring.boot
artifact: spring-boot-foobar-app
package: com.spring.boot.foobar.demo

Dependencies to include:

Spring Web
Spring Boot DevTools (optional)

Spring Configuration Processor (optional)

<dependencies>
	<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>
		<optional>true</optional>
	</dependency>

	<dependency>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-configuration-processor</artifactId>
		<optional>true</optional>
	</dependency>

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

Create these sub-packages under the base package:

com.spring.boot.foobar.demo.beans
com.spring.boot.foobar.demo.controllers

Create two Component classes: Foo and Bar, under the com.spring.boot.foobar.demo.beans package with the following details:

The class Foo will have a name data member of type String.
The Bar class will have three data members: String name, int age, and a dependency (object reference) Foo foo.
The classes will have constructors, accessors, and mutators, and override the toString() method.
(Hint - You can refer to discussion Task - Spring - FooBar App #30 for code snippets to reuse.)

Write @Bean definitions for the components in the Configuration class.

Create the following Controller classes in com.spring.boot.foobar.demo.controllers package:

HomeController: Shows a welcome message to the visitor upon visiting the API base URL
FoobarController: Autowire the Foo and Bar beans and print both the bean objects using two different handler methods with GET mappings.

Create the handler methods and the following mappings in the appropriate controllers:

/api - GET - Displays a welcome message "Hello visitor!\nVisiting time: ${CURRENT_TIMESTAMP}"
/api/beans/foo - GET - Displays the details of an instance of Foo bean class.
/api/beans/bar - GET - Displays the details of an instance of Bar bean class.
/api/beans/all - GET - Displays a List of instances of every bean in the application.

Demonstrate the working with code snippets and screenshots. (You can use this template for submitting solutions)

GouthamGunji · 2022-05-02T06:19:10Z

GouthamGunji
May 2, 2022

Components

Foo.java

package com.spring.boot.foobar.demo.beans;

import org.springframework.stereotype.Component;

@Component
public class Foo {

	private String name;

	public String getName() {
		return name;
	}

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

	public Foo(String name) {
		this.name = name;
	}

	public Foo() {
	}

	@Override
	public String toString() {
		return "Foo [name=" + name + "]";
	}
}

Bar.java

package com.spring.boot.foobar.demo.beans;

import org.springframework.stereotype.Component;

@Component
public class Bar {
	private String name;
	private int age;
	private Foo foo;

	public String getName() {
		return name;
	}

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

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	public Foo getFoo() {
		return foo;
	}

	public void setFoo(Foo foo) {
		this.foo = foo;
	}

	public Bar(String name, int age) {
		super();
		this.name = name;
		this.age = age;
	}

	public Bar() {
		super();
	}

	@Override
	public String toString() {
		return "Bar [name=" + name + ", age=" + age + "]";
	}

}

Bean Definition class

package com.spring.boot.foobar.demo.configuration;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import com.spring.boot.foobar.demo.beans.Bar;
import com.spring.boot.foobar.demo.beans.Foo;

@Configuration
public class FooBarConfiguration {

	@Bean
	public Foo getFoo() {
		return new Foo("Goutham");
	}

	@Bean
	public Bar getBar() {
		Bar bar = new Bar("Gk", 29);
		bar.setFoo(getFoo());
		return bar;
	}

}

Controllers

Home Controller

package com.spring.boot.foobar.demo.controller;

import java.sql.Timestamp;

@RestController
public class HomeController {

	@GetMapping
	public String welcomeVisitor() {
		return "Hello visitor!\\nVisiting time: "
				+ new SimpleDateFormat("yyyy.MM.dd.HH.mm.ss").format(new Timestamp(System.currentTimeMillis()));

	}

}

FooBarController

package com.spring.boot.foobar.demo.controller;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.spring.boot.foobar.demo.beans.Bar;
import com.spring.boot.foobar.demo.beans.Foo;
import com.spring.boot.foobar.demo.configuration.FooBarConfiguration;

@RestController
@RequestMapping("/beans")
public class FooBarController {

	@Autowired
	private FooBarConfiguration fooBarConfiguration;
	
	@GetMapping("/foo")
	public Foo getFoo() {
		return fooBarConfiguration.getFoo();
	}

	@GetMapping("/bar")
	public Bar getBar() {
		return fooBarConfiguration.getBar();
	}

	@GetMapping("/all")
	public List<Object> getAll() {
		List list = new ArrayList();
		
		list.add(getFoo());
		list.add(getBar());
		
		return list;
		
		
	}

}

application.properties file

server.servlet.context-path=/api

ScreenShot

0 replies

Svishva · 2022-05-03T17:40:28Z

Svishva
May 3, 2022

VisweshwaranM

SpringBootFoobarAppApplication.java

@SpringBootApplication
public class SpringBootFoobarAppApplication {

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

	@Bean
	public Foo getFoo() {
		return new Foo("Visweshwaran");
	}

	@Bean
	public Bar getBar() {
		Bar bar = new Bar("Muralidaran", 26);
		bar.setFoo(getFoo());
		return bar;
	}

}

Bar.java

@Component
public class Bar {

	@Value("VisweshwaranM - DEFAULT BAR")
	private String name;
	
	@Value("10")
	private int age;
	private Foo foo;

	public Bar() {

	}

	public Bar(String name, int age) {
		this.name = name;
		this.age = age;
	}

	public String getName() {
		return name;
	}

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

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	public void setFoo(Foo foo) {
		this.foo = foo;
	}

	@Override
	public String toString() {
		return new StringBuilder().append("Bar [name=").append(name).append(", age=").append(age).append(", foo=")
				.append(foo).append("]").toString();
	}

	public String printDataVar() {
		return new StringBuilder().append("\n First Name: ").append(this.name).append("\n Last Name: ")
				.append(this.foo.getName()).append("\n Age: ").append(this.age).append("\n").toString();

	}

}

Foo.java

@Component
public class Foo {
	
	@Value("VisweshwaranM - DEFAULT FOO")
	private String name;

	public Foo() {
	}

	public Foo(String name) {
		this.setName(name);
	}

	public String getName() {
		return name;
	}

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

	@Override
	public String toString() {
		return new StringBuilder().append("Foo [name=").append(name).append("]").toString();
	}
}

FoobarController.java

@RestController
@RequestMapping("/api/beans")
public class FoobarController {

	@Autowired
	private Foo foo;

	@Autowired
	private Bar bar;

	@GetMapping("/foo")
	public String fooBeanDetails() {
		return foo.toString();
	}

	@GetMapping("/bar")
	public String barBeanDetails() {
//		return bar.printDataVar();
		return new StringBuilder().append("\n First Name: ").append(bar.getName()).append("\n Last Name: ").append("")
				.append("\n Age: ").append(bar.getAge()).append("\n").toString();
	}

	@GetMapping("/all")
	public List<String> allBeanDetails() {
		return List.of(foo.getName(), bar.getName());
	}

}

HomeController.java

@RestController
public class HomeController {

	@GetMapping("/api")
	public String homePage() {
		return "Hello visitor <br> Visiting time:"
				+ DateTimeFormatter.ofPattern("MM/dd/yyyy 'at' hh:mm a").format(LocalDateTime.now());
	}
}

Screenshots

0 replies

Trivikram-Sharma · 2022-05-22T16:41:29Z

Trivikram-Sharma
May 22, 2022

Components

Foo.java

package com.springboot.demo.beans;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

@Component
public class Foo {
	@Value("Manish Malhotra")
	private String name;

	public Foo() {
		super();
	}

	public Foo(String name) {
		super();
		this.name = name;
	}

	public String getName() {
		return name;
	}

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

	@Override
	public String toString() {
		return "Foo [name=" + name + "]";
	}
	
}

Bar.java

package com.springboot.demo.beans;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

@Component
public class Bar {
	
	@Value("Manish Malhotra")
	private String name;
	@Value("32")
	private int age;
	
	@Autowired
	private Foo foo;
	
	public Bar(String name, int age) {
		super();
		this.name = name;
		this.age = age;
	}
	public Bar() {
		super();
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public Foo getFoo() {
		return foo;
	}
	public void setFoo(Foo foo) {
		this.foo = foo;
	}
	@Override
	public String toString() {
		return "Bar [name=" + name + ", age=" + age + ", foo=" + foo + "]";
	}
	
	
}

Controllers

HomeController.java

package com.springboot.demo.controllers;

import java.util.Date;

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

@RestController
@RequestMapping("/api")
public class HomeController {
	private String message = "Hello Visitor! \n Visiting Time: "+new Date();

	@GetMapping("")
	public String getMessage() {
		return message;
	}

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

FoobarController.java

package com.springboot.demo.controllers;

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

import com.springboot.demo.beans.Bar;
import com.springboot.demo.beans.Foo;

@RestController
@RequestMapping("/api/beans")
public class FoobarController {

	@Autowired
	private Foo foo;
	
	@Autowired
	private Bar bar;

	@GetMapping("/foo")
	public String getFoo() {
		return foo.toString();
	}

	public void setFoo(Foo foo) {
		this.foo = foo;
	}
	
	@GetMapping("/bar")
	public String getBar() {
		return bar.toString();
	}

	public void setBar(Bar bar) {
		this.bar = bar;
	}
	@GetMapping("/all")
	public String getAllBeans() {
		return foo.toString() + "\n" + bar.toString();
	}
	
}

Application Driver

package com.springboot.demo;

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

import com.springboot.demo.controllers.FoobarController;

@SpringBootApplication
public class SpringbootFoobarAppApplication {

	public static void main(String[] args) {
		SpringApplication.run(SpringbootFoobarAppApplication.class, args);
		//FoobarController controller = new FoobarController();
		System.out.println("Spring Boot Foo Bar Application Works!!");
	}

}

Application Properties

None

Configuration

FoobarConfiguration.java

package com.springboot.demo.configuration;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import com.springboot.demo.beans.Bar;
import com.springboot.demo.beans.Foo;

@Configuration
public class FoobarConfiguration {
	
	@Bean
	public Foo getFoo() {
		return new Foo("Manish Malhotra");
	}
	
	@Bean
	public Bar getBar() {
		Bar bar = new Bar("Manish Malhotra",32);
		bar.setFoo(getFoo());
		return bar;
	}
}

0 replies

Rahulupadhyay17 · 2022-05-29T10:56:49Z

Rahulupadhyay17
May 29, 2022

SpringBootFoobarAppApplication Class

package com.spring.boot.foobar.demo;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SpringBootFoobarAppApplication {

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

Components

Bar Class

package com.spring.boot.foobar.demo.beans;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

@Component
public class Bar {
	
	@Value("Rahul")
	private String name;
	
	@Value("27")
	private int age;
	
	@Autowired
	private Foo foo;
	
	public Bar() {
		super();
	}

	public Bar(String name, int age) {
		super();
		this.name = name;
		this.age = age;
	}

	public String getName() {
		return name;
	}

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

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	public Foo getFoo() {
		return foo;
	}

	public void setFoo(Foo foo) {
		this.foo = foo;
	}

	@Override
	public String toString() {
		return "Bar [name=" + name + ", age=" + age + ", foo=" + foo + "]";
	}

}

Foo Class

package com.spring.boot.foobar.demo.beans;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

@Component
public class Foo {
	@Value("ABCD")
	private String name;

	public Foo() {
		super();
	}

	public Foo(String name) {
		super();
		this.name = name;
	}

	public String getName() {
		return name;
	}

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

	@Override
	public String toString() {
		return "Foo [name=" + name + "]";
	}

}

Controllers

Home Controller

package com.spring.boot.foobar.demo.controller;

import java.sql.Timestamp;
import java.util.Date;

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

@RestController
public class HomeController {
	

	@GetMapping("/api")
	public String welcomeMessage()
	{
		return  "Hello visitor!\nVisiting time: " + new Date();
	}

}

FooBar Controller

package com.spring.boot.foobar.demo.controller;

import java.sql.Timestamp;
import java.util.Date;

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

@RestController
public class HomeController {
	

	@GetMapping("/api")
	public String welcomeMessage()
	{
		return  "Hello visitor!\nVisiting time: " + new Date();
	}

}

FooBar Configuration

package com.spring.boot.foobar.demo.controller;

import java.sql.Timestamp;
import java.util.Date;

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

@RestController
public class HomeController {
	

	@GetMapping("/api")
	public String welcomeMessage()
	{
		return  "Hello visitor!\nVisiting time: " + new Date();
	}

}

Screenshots

Welcome Message

Foo details

Bar details

Details of all instances

0 replies

Jits1995 · 2022-06-14T06:31:36Z

Jits1995
Jun 14, 2022

Beans

Foo

package com.spring.boot.foobar.demo.beans;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

@Component
public class Foo {

	@Value("Jits")
	private String name;

	public Foo() {
		super();
		// TODO Auto-generated constructor stub
	}

	public Foo(String name) {
		super();
		this.name = name;
	}

	public String getName() {
		return name;
	}

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

	@Override
	public String toString() {
		return "Foo [name=" + name + "]";
	}
	
}

Bar

package com.spring.boot.foobar.demo.beans;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

@Component
public class Bar {
	
	@Value("Makvana")
	private String name;
	
	@Value("${bar.age:27}")
	private int age;
	
	@Autowired
	private Foo foo;
	
	public Bar() {
		super();
		// TODO Auto-generated constructor stub
	}

	public Bar(String name, int age) {
		super();
		this.name = name;
		this.age = age;
	}

	public String getName() {
		return name;
	}

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

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	public Foo getFoo() {
		return foo;
	}

	public void setFoo(Foo foo) {
		this.foo = foo;
	}

	@Override
	public String toString() {
		return "Bar [name=" + name + ", age=" + age + ", foo=" + foo + "]";
	}
	
}

HomeController

package com.spring.boot.foobar.demo.controllers;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

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

@RestController
@RequestMapping("/home/controller")
public class HomeController {

	@GetMapping("/api")
	public String homePage() {
		return "Hello visitor <br> Visiting time:"
				+ DateTimeFormatter.ofPattern("MM/dd/yyyy 'at' hh:mm a").format(LocalDateTime.now());
	}
	
}

FooBarController

package com.spring.boot.foobar.demo.controllers;

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

import com.spring.boot.foobar.demo.beans.Bar;
import com.spring.boot.foobar.demo.beans.Foo;

@RestController
@RequestMapping("/api/beans")
public class FoobarController {

	@Autowired
	private Foo foo;
	
	@Autowired
	private Bar bar;

	@GetMapping("/foo")
	public Foo getFoo() {
		return foo;
	}

	@GetMapping("/bar")
	public String getBar() {
		return bar.toString();
	}

}

DriverClass

package com.spring.boot.foobar.demo;

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

@SpringBootApplication
public class SpringBootFoobarAppApplication {

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

}

0 replies

AtharvChavan05 · 2022-11-15T22:26:12Z

AtharvChavan05
Nov 15, 2022

Beans

Foo.java

package com.example.demo.beans;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

@Component 
public class Foo {
	@Value("Atharv")
	private String name;

	@Override
	public String toString() {
		return "Foo [name=" + name + "]";
	}
}

Bar.java

package com.example.demo.beans;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

@Component
public class Bar {
	@Value("Atharv Chavan")
	private String name;
	
	@Value("30")
	private int age;
	
	@Autowired
	private Foo foo;
	
	@Override
	public String toString() {
		return "Bar [name=" + name + ", age=" + age + ", foo=" + foo + "]";
	}
}

Driver

DemoApplication.class

package com.example.demo;

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

@SpringBootApplication
public class DemoApplication {

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

}

Controllers

HomeController.java

package com.example.demo.controller;

import java.sql.Timestamp;
import java.text.SimpleDateFormat;

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

@RestController
public class HomeController {

	@GetMapping("/api")
	public String welcomeVisitor() {
		return "Hello visitor!Visiting time: "
				+ new SimpleDateFormat("yyyy.MM.dd.HH.mm.ss").format(new Timestamp(System.currentTimeMillis()));

	}
}

FooBarController.java

package com.example.demo.controller;

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

import com.example.demo.beans.Bar;
import com.example.demo.beans.Foo;

@RestController
@RequestMapping("/api/beans")
public class FooBarController {

	@Autowired
	private Foo foo;

	@Autowired
	private Bar bar;
	

	@GetMapping("/foo")
	public String fooBeanDetails() {
		return foo.toString();
	}
	
	
	@GetMapping("/bar")
	public String barBeanDetails() {
		return bar.toString();
	}

	@GetMapping("/all")
	public String allBeanDetails() {
		return foo.toString()+" "+bar.toString();
	}

}

Screenshots

0 replies

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Task - Spring Boot - FooBar App #59

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akash-coded May 2, 2022 Maintainer

FooBar application with Spring Boot

Using @RestController, @Component and @Bean

Replies: 6 comments

Uh oh!

Uh oh!

GouthamGunji May 2, 2022

Components

Foo.java

Bar.java

Bean Definition class

Controllers

Home Controller

FooBarController

application.properties file

ScreenShot

Uh oh!

Svishva May 3, 2022

VisweshwaranM

SpringBootFoobarAppApplication.java

Bar.java

Foo.java

FoobarController.java

HomeController.java

Screenshots

Uh oh!

Trivikram-Sharma May 22, 2022

Components

Controllers

Application Driver

Application Properties

Configuration

Uh oh!

Rahulupadhyay17 May 29, 2022

SpringBootFoobarAppApplication Class

Components

Bar Class

Foo Class

Controllers

Home Controller

FooBar Controller

FooBar Configuration

Screenshots

Welcome Message

Foo details

Bar details

Details of all instances

Uh oh!

Jits1995 Jun 14, 2022

Beans

Foo

Bar

HomeController

FooBarController

DriverClass

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AtharvChavan05 Nov 15, 2022

Beans

Foo.java

Bar.java

Driver

DemoApplication.class

Controllers

HomeController.java

FooBarController.java

Screenshots

akash-coded
May 2, 2022
Maintainer

Using `@RestController`, `@Component` and `@Bean`

GouthamGunji
May 2, 2022

Svishva
May 3, 2022

Trivikram-Sharma
May 22, 2022

Rahulupadhyay17
May 29, 2022

Jits1995
Jun 14, 2022

AtharvChavan05
Nov 15, 2022