SpringBoot

Introduction

Framework to build microservices
common non-functional features
not zero code generation
not a web or application server
provides starter projects
embedded server (incl. in application jar)
externalized configuration

Concepts

SpringBoot Autoconfiguration: by scanning the classpath
Dispatcher Servlet
SpringBoot Actuator (for monitoring)

Security

adding to pom.xml:

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

and update the project automatically sets up form-based authentication with a generated session cookie generated on the server or basic authentication with a header sent along with every request

user='user
pwd=see console output of server start

or set it in application.properties

spring.security.user.name=uwe
spring.security.user.password=uwe

This has to be entered just once.

Configuration

Application Properties

in \<Project>\src\main\resources\application.properties

logging.level.org.springframework = debug

#security configuration see here

#H2 database configuration see here

Implementation

Main Application

see /test1/src/main/java/com/uweheuer/springboot/test1/Test1Application.java/

@SpringBootApplication
public class Test1Application {
  ...
  public static void main(String[] args) {
    SpringApplication.run(Test1Application.class, args);
  }
  ...

Rest Controller

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

@RestController
@CrossOrigin(origins="http://localhost:4200") // avoid cross origin errors in browser
public class HelloWorldController 
{
  // @RequestMapping(method=RequestMethod.GET, path="/hello-world")
  @GetMapping(path="/hello-world")

Resources

Examples

Udemy Course

start eclipse
File -> Import -> Maven Project

Bookmarks

start eclipse
File -> Import -> Maven -> Existing Maven Projects
select C:\Uwes\eclipse\workspace_2020-12\SpringBoot\bookmarks

Database Configuration

The default is that the datasource url is generated randomly and printed to the console. The default user is 'sa', default password is empty.

in application.properties

spring.profiles.active=[dev|laptopmysql|raspberry]

and created in \bookmarks\src\main\resources\ dedicated property files application-[dev|laptopmysql|raspberry].properties

ToDos

switch H2 and MySQL and adjust maven build