REST TUTORIAL POST METHOD



This example explains how to implements the Post Method in Spring Boot Project

Following are the configuration and implementation details used in this example.


Step 1: Create Maven project

Following pom.xml defines the dependencies for this example. 

			
			


  <?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	 <modelVersion>4.0.0</modelVersion>
                <parent>
		 <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-parent</artifactId>
                <version>2.3.2.RELEASE</version>
                <relativePath/> 
	 </parent>
	 <groupId>com.smoothexample</groupId>
                <artifactId>spring</artifactId>
                <version>0.0.1-SNAPSHOT</version>
                <name>spring</name>
                <description>Demo project for Spring Boot</description>

	 <properties>
		 <java.version>11</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>
                <optional>true</optional>
                </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>
                <exclusions>
				 <exclusion>
					 <groupId>org.junit.vintage</groupId>
                <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
			 </exclusions>
		 </dependency>
	 </dependencies>

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

 </project>


Step 2: Create a Model for the Project

Following file defines the MODEL for this example. 

			


package com.smoothexample.spring.model;

import javax.persistence.*;
import java.io.Serializable;

@Entity
@Table(name = "employee")
public class Employee implements Serializable {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long id;

    @Column(name = "first_name")
    private String first_name;

    @Column(name = "last_name")
    private String last_name;

    @Column(name = "address")
    private String address;

    @Column(name = "language")
    private String language;

    public Employee() {
    }

    public Employee(long id, String first_name, String last_name, String address, String language) {
        this.id = id;
        this.first_name = first_name;
        this.last_name = last_name;
        this.address = address;
        this.language = language;

    }

    public long getId() {
        return id;
    }

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

    public String getFirst_name() {
        return first_name;
    }

    public void setFirst_name(String first_name) {
        this.first_name = first_name;
    }

    public String getLast_name() {
        return last_name;
    }

    public void setLast_name(String last_name) {
        this.last_name = last_name;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getLanguage() {
        return language;
    }

    public void setLanguage(String language) {
        this.language= language;
    }


}


Step 3: Create Repository

   Following file defines the Repository for this example. 
             	


			
  package com.smoothexample.spring.repository;

import com.smoothexample.spring.model.Employee;
import org.springframework.data.repository.CrudRepository;
public interface EmployeeRepository extends CrudRepository<Employee, Long> {
}


Step 4: Create Service

In the following file can define the Service for this example 


			
package com.smoothexample.spring.service;

import com.smoothexample.spring.model.Employee;
import java.util.List;
public interface EmployeeService {
    public List<Employee> getAllEmployee();
    public Employee getByid(Long id);
    public void saveorupdate(Employee employee);
    public void deleteEmployee(Long id);
    void updateEmployee(Employee employee);
}


Step 5: Create ServiceImpl

Following file defines the ServiceImpl for this example. 
			


package com.smoothexample.service;

import com.smoothexample.model.Employee;
import com.smoothexample.repository.EmployeeRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.transaction.Transactional;
import java.util.List;
import java.util.Optional;

@Service
@Transactional
public class EmployeeServiceImpl implements EmployeeService{
   @Autowired
    EmployeeRepository employeeRepository;


    @Override
    public List< Employee> getAllEmployee() {
        return (List< Employee>)employeeRepository.findAll();
    }

    @Override
    public Employee getByid(Long id) {
        return employeeRepository.findById(id).get();
    }

    @Override
    public void saveorupdate(Employee employee) {
        employeeRepository.save(employee);

    }

    @Override
    public void updateEmployee(Employee employee) {
        Optional< Employee> empDb = this.employeeRepository.findById(employee.getId());
        if (empDb.isPresent()) {
            Employee courseUpdate = empDb.get();
            employee.setId(employee.getId());
            employee.setFirst_name(employee.getFirst_name());
            employee.setLast_name(employee.getLast_name());
            employee.setAddress(employee.getAddress());
            employee.setLanguage(employee.getLanguage());

            employeeRepository.save(employee);


        }
    }

    @Override
    public void deleteEmployee(Long id) {
        employeeRepository.deleteById(id);
    }
}


Step 6: Create Controller

Implements the POST METHOD in controller.
In here it display all data’s from database. 

			
			

package com.smoothexample.spring.controller;

import com.smoothexample.spring.model.Employee;
import com.smoothexample.spring.service.EmployeeService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;

import java.util.List;

@RestController
@EnableAutoConfiguration
@RequestMapping(value = "/api")
public class  EmployeeController {

    @Autowired
    EmployeeService employeeService;



    @PostMapping("/save")
    public Employee save(@RequestBody Employee employee){
        employeeService.saveorupdate((employee));
        return employee;
    }
 }


 JSON Response

 http://localhost:8080/api/save
            
{
  "first_name": "giri",
  "last_name": "govind",
  "address": "tvm",
  "language":"english"
}

OUTPUT