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Ramesh Fadatare
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spring boot + spring data jpa + h2 database
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‎springboot2-jpa-crud-example/src/main/java/net/guides/springboot2/springboot2jpacrudexample/SpringRestClient.java‎

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package net.guides.springboot2.springboot2jpacrudexample;
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import java.util.Arrays;
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import java.util.HashMap;
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import java.util.Map;
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import org.springframework.http.HttpEntity;
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import org.springframework.http.HttpHeaders;
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import org.springframework.http.HttpMethod;
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import org.springframework.http.MediaType;
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import org.springframework.http.ResponseEntity;
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import org.springframework.web.client.RestTemplate;
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import net.guides.springboot2.springboot2jpacrudexample.model.Employee;
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public class SpringRestClient {
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private static final String GET_EMPLOYEES_ENDPOINT_URL = "http://localhost:8080/api/v1/employees";
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private static final String GET_EMPLOYEE_ENDPOINT_URL = "http://localhost:8080/api/v1/employees/{id}";
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private static final String CREATE_EMPLOYEE_ENDPOINT_URL = "http://localhost:8080/api/v1/employees";
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private static final String UPDATE_EMPLOYEE_ENDPOINT_URL = "http://localhost:8080/api/v1/employees/{id}";
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private static final String DELETE_EMPLOYEE_ENDPOINT_URL = "http://localhost:8080/api/v1/employees/{id}";
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private static RestTemplate restTemplate = new RestTemplate();
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public static void main(String[] args) {
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SpringRestClient springRestClient = new SpringRestClient();
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// Step1: first create a new employee
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springRestClient.createEmployee();
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// Step 2: get new created employee from step1
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springRestClient.getEmployeeById();
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// Step3: get all employees
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springRestClient.getEmployees();
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// Step4: Update employee with id = 1
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springRestClient.updateEmployee();
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// Step5: Delete employee with id = 1
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springRestClient.deleteEmployee();
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}
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private void getEmployees() {
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HttpHeaders headers = new HttpHeaders();
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headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
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HttpEntity<String> entity = new HttpEntity<String>("parameters", headers);
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ResponseEntity<String> result = restTemplate.exchange(GET_EMPLOYEES_ENDPOINT_URL, HttpMethod.GET, entity,
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String.class);
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System.out.println(result);
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}
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private void getEmployeeById() {
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Map<String, String> params = new HashMap<String, String>();
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params.put("id", "1");
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RestTemplate restTemplate = new RestTemplate();
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Employee result = restTemplate.getForObject(GET_EMPLOYEE_ENDPOINT_URL, Employee.class, params);
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System.out.println(result);
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}
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private void createEmployee() {
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Employee newEmployee = new Employee("admin", "admin", "[email protected]");
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RestTemplate restTemplate = new RestTemplate();
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Employee result = restTemplate.postForObject(CREATE_EMPLOYEE_ENDPOINT_URL, newEmployee, Employee.class);
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System.out.println(result);
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}
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private void updateEmployee() {
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Map<String, String> params = new HashMap<String, String>();
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params.put("id", "1");
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Employee updatedEmployee = new Employee("admin123", "admin123", "[email protected]");
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RestTemplate restTemplate = new RestTemplate();
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restTemplate.put(UPDATE_EMPLOYEE_ENDPOINT_URL, updatedEmployee, params);
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}
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private void deleteEmployee() {
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Map<String, String> params = new HashMap<String, String>();
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params.put("id", "1");
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RestTemplate restTemplate = new RestTemplate();
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restTemplate.delete(DELETE_EMPLOYEE_ENDPOINT_URL, params);
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}
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}

‎springboot2-jpa-h2-crud-example/.gitignore‎

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/target/
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!.mvn/wrapper/maven-wrapper.jar
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### STS ###
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.apt_generated
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.classpath
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.factorypath
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.project
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.settings
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.springBeans
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.sts4-cache
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### IntelliJ IDEA ###
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.idea
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*.iws
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*.iml
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*.ipr
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### NetBeans ###
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/nbproject/private/
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/build/
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/nbbuild/
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/dist/
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/nbdist/
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/.nb-gradle/

‎springboot2-jpa-h2-crud-example/.mvn/wrapper/maven-wrapper.jar‎

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‎springboot2-jpa-h2-crud-example/.mvn/wrapper/maven-wrapper.properties‎

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distributionUrl=https://repo1.maven.org/maven2/org/apache/maven/apache-maven/3.5.4/apache-maven-3.5.4-bin.zip

‎springboot2-jpa-h2-crud-example/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>net.guides.springboot2</groupId>
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<artifactId>springboot2-jpa-crud-example</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<packaging>jar</packaging>
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<name>springboot2-jpa-crud-example</name>
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<description>Demo project for Spring Boot</description>
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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>2.0.5.RELEASE</version>
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<relativePath /> <!-- lookup parent from repository -->
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</parent>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
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<java.version>1.8</java.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-data-jpa</artifactId>
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</dependency>
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<dependency>
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<groupId>com.h2database</groupId>
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<artifactId>h2</artifactId>
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<scope>runtime</scope>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-test</artifactId>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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</plugin>
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</plugins>
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</build>
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</project>

‎springboot2-jpa-h2-crud-example/src/main/java/net/guides/springboot2/springboot2jpacrudexample/Application.java‎

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package net.guides.springboot2.springboot2jpacrudexample;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.boot.web.client.RestTemplateBuilder;
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import org.springframework.context.annotation.Bean;
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import org.springframework.web.client.RestTemplate;
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@SpringBootApplication
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public class Application {
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@Bean
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public RestTemplate restTemplate(RestTemplateBuilder builder) {
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return builder.build();
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}
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public static void main(String[] args) {
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SpringApplication.run(Application.class, args);
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}
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}

‎springboot2-jpa-h2-crud-example/src/main/java/net/guides/springboot2/springboot2jpacrudexample/SpringRestClient.java‎

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package net.guides.springboot2.springboot2jpacrudexample;
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import java.util.Arrays;
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import java.util.HashMap;
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import java.util.Map;
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import org.springframework.http.HttpEntity;
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import org.springframework.http.HttpHeaders;
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import org.springframework.http.HttpMethod;
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import org.springframework.http.MediaType;
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import org.springframework.http.ResponseEntity;
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import org.springframework.web.client.RestTemplate;
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import net.guides.springboot2.springboot2jpacrudexample.model.Employee;
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public class SpringRestClient {
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private static final String GET_EMPLOYEES_ENDPOINT_URL = "http://localhost:8080/api/v1/employees";
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private static final String GET_EMPLOYEE_ENDPOINT_URL = "http://localhost:8080/api/v1/employees/{id}";
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private static final String CREATE_EMPLOYEE_ENDPOINT_URL = "http://localhost:8080/api/v1/employees";
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private static final String UPDATE_EMPLOYEE_ENDPOINT_URL = "http://localhost:8080/api/v1/employees/{id}";
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private static final String DELETE_EMPLOYEE_ENDPOINT_URL = "http://localhost:8080/api/v1/employees/{id}";
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private static RestTemplate restTemplate = new RestTemplate();
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public static void main(String[] args) {
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SpringRestClient springRestClient = new SpringRestClient();
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// Step1: first create a new employee
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springRestClient.createEmployee();
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// Step 2: get new created employee from step1
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springRestClient.getEmployeeById();
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// Step3: get all employees
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springRestClient.getEmployees();
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// Step4: Update employee with id = 1
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springRestClient.updateEmployee();
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// Step5: Delete employee with id = 1
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springRestClient.deleteEmployee();
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}
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private void getEmployees() {
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HttpHeaders headers = new HttpHeaders();
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headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
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HttpEntity<String> entity = new HttpEntity<String>("parameters", headers);
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ResponseEntity<String> result = restTemplate.exchange(GET_EMPLOYEES_ENDPOINT_URL, HttpMethod.GET, entity,
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String.class);
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System.out.println(result);
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}
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private void getEmployeeById() {
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Map<String, String> params = new HashMap<String, String>();
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params.put("id", "1");
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RestTemplate restTemplate = new RestTemplate();
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Employee result = restTemplate.getForObject(GET_EMPLOYEE_ENDPOINT_URL, Employee.class, params);
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System.out.println(result);
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}
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private void createEmployee() {
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Employee newEmployee = new Employee("admin", "admin", "[email protected]");
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RestTemplate restTemplate = new RestTemplate();
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Employee result = restTemplate.postForObject(CREATE_EMPLOYEE_ENDPOINT_URL, newEmployee, Employee.class);
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System.out.println(result);
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}
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private void updateEmployee() {
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Map<String, String> params = new HashMap<String, String>();
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params.put("id", "1");
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Employee updatedEmployee = new Employee("admin123", "admin123", "[email protected]");
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RestTemplate restTemplate = new RestTemplate();
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restTemplate.put(UPDATE_EMPLOYEE_ENDPOINT_URL, updatedEmployee, params);
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}
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private void deleteEmployee() {
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Map<String, String> params = new HashMap<String, String>();
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params.put("id", "1");
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RestTemplate restTemplate = new RestTemplate();
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restTemplate.delete(DELETE_EMPLOYEE_ENDPOINT_URL, params);
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}
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}

‎springboot2-jpa-h2-crud-example/src/main/java/net/guides/springboot2/springboot2jpacrudexample/controller/EmployeeController.java‎

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package net.guides.springboot2.springboot2jpacrudexample.controller;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import javax.validation.Valid;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.http.ResponseEntity;
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import org.springframework.web.bind.annotation.CrossOrigin;
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import org.springframework.web.bind.annotation.DeleteMapping;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.PathVariable;
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import org.springframework.web.bind.annotation.PostMapping;
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import org.springframework.web.bind.annotation.PutMapping;
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import org.springframework.web.bind.annotation.RequestBody;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.RestController;
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import net.guides.springboot2.springboot2jpacrudexample.exception.ResourceNotFoundException;
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import net.guides.springboot2.springboot2jpacrudexample.model.Employee;
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import net.guides.springboot2.springboot2jpacrudexample.repository.EmployeeRepository;
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@CrossOrigin(origins = "http://localhost:4200")
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@RestController
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@RequestMapping("/api/v1")
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public class EmployeeController {
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@Autowired
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private EmployeeRepository employeeRepository;
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@GetMapping("/employees")
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public List<Employee> getAllEmployees() {
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return employeeRepository.findAll();
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}
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@GetMapping("/employees/{id}")
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public ResponseEntity<Employee> getEmployeeById(@PathVariable(value = "id") Long employeeId)
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throws ResourceNotFoundException {
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Employee employee = employeeRepository.findById(employeeId)
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.orElseThrow(() -> new ResourceNotFoundException("Employee not found for this id :: " + employeeId));
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return ResponseEntity.ok().body(employee);
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}
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@PostMapping("/employees")
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public Employee createEmployee(@Valid @RequestBody Employee employee) {
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return employeeRepository.save(employee);
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}
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@PutMapping("/employees/{id}")
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public ResponseEntity<Employee> updateEmployee(@PathVariable(value = "id") Long employeeId,
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@Valid @RequestBody Employee employeeDetails) throws ResourceNotFoundException {
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Employee employee = employeeRepository.findById(employeeId)
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.orElseThrow(() -> new ResourceNotFoundException("Employee not found for this id :: " + employeeId));
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employee.setEmailId(employeeDetails.getEmailId());
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employee.setLastName(employeeDetails.getLastName());
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employee.setFirstName(employeeDetails.getFirstName());
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final Employee updatedEmployee = employeeRepository.save(employee);
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return ResponseEntity.ok(updatedEmployee);
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}
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@DeleteMapping("/employees/{id}")
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public Map<String, Boolean> deleteEmployee(@PathVariable(value = "id") Long employeeId)
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throws ResourceNotFoundException {
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Employee employee = employeeRepository.findById(employeeId)
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.orElseThrow(() -> new ResourceNotFoundException("Employee not found for this id :: " + employeeId));
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employeeRepository.delete(employee);
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Map<String, Boolean> response = new HashMap<>();
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response.put("deleted", Boolean.TRUE);
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return response;
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}
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}

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