PROGRAMMING

m9/ JAVA
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Last update:   25-09-2021

SPRING WEB

! Spring Boot is the most popular way to start Spring projects. Spring Boot is built on top of the spring framework. Start by creating a new Spring Web project by opening intializer on start.spring.io
 
/**
 * /myproject/src/main/java/com/example/App.java 
 */

package com.example;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
@RestController
public class App {

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

    @GetMapping("/myproject/")
    public String welcome() {
        return "Welcome";
    }

    @GetMapping("/myproject/hello")
    public String hello() {
        return "Hello World";
    }

}
... 17 lines
 
The application build configuration is defined in 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 
        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>2.5.4</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>spproject</artifactId>
    <version>0.0.1</version>
    <name>myproject</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-web</artifactId>
        </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>

</project>
... 34 lines
 
Build and run the application using Maven.
 
./mvnw spring-boot:run
Spring boot embedded Apache Tomcat server, listening for requests on localhost, port 8080. You can test it using curl or browser.
 
curl localhost:8080/myproject/
    # Welcome
 
http://localhost:8080/myproject/hello
    # Hello World

Questions    
Rest Controller