MasterJavaWebServicesAndRESTAPIwithSpringBoot

01 - Getting Started

02 - Introduction To Web Services

001 Introduction To Web Services - An Overview

如何让不同语言或不同服务之间通信

有两个服务

使用固定格式通信,与平台无关,实现跨语言和系统的通信

主流有 json 和 xml 的通信格式

004 Web Services - Key Terminology

005 Introduction to SOAP Web Services

006 Introduction to RESTful Web Services

007 SOAP vs RESTful Web Services

03 - Introduction to Spring Framework in 10 Steps (NOW 16)

001 Step 01 - Getting Started with Spring Framework - Goals

003 Step 02 - Setting up New Spring Project with Spring Initializr

不要使用 snapshot 版本

004 Step 03 - Iteration 1 - Building Tightly Coupled GameRunner and MarioGame

package org.malred.learnspringframework;

import org.malred.learnspringframework.game.GameRunner;
import org.malred.learnspringframework.game.MarioGame;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class LearnSpringFrameworkApplication {

  // 用vscode拓展和mvn org.springframework.boot:spring-boot-maven-plugin:2.6.3:run运行成功
  // mvn springboot:run 失败
  public static void main(String[] args) {
    // SpringApplication.run(LearnSpringFrameworkApplication.class, args);
    MarioGame game = new MarioGame();
    GameRunner runner = new GameRunner(game);
    runner.run();
  }
}

package org.malred.learnspringframework.game;

public class MarioGame {

  public void up() {
    System.out.println("up");
  }

  public void down() {
    System.out.println("down");
  }

  public void left() {
    System.out.println("left");
  }

  public void right() {
    System.out.println("right");
  }
}

package org.malred.learnspringframework.game;

public class GameRunner {

  private MarioGame game;

  public GameRunner(MarioGame game) {
    this.game = game;
  }

  public void run() {
    game.up();
    game.down();
    game.left();
    game.right();
  }
}

005 Step 04 - Understanding Tight Coupling

新创建一个 SuperContraGame 类，发现当要切换为 SuperContraGame 时，需要修改很多地方(GameRunner 的构造器、实例化的 game 类)

package org.malred.learnspringframework.game;

public class SuperContraGame {

  public void up() {
    System.out.println("SuperContraGame up");
  }

  public void down() {
    System.out.println("SuperContraGame down");
  }

  public void left() {
    System.out.println("SuperContraGame left");
  }

  public void right() {
    System.out.println("SuperContraGame right");
  }
}

006 Step 05 - Iteration 2 - Loose Coupling Level 1 - Interfaces

通过接口减少耦合

package com.example.demo.game;

public interface GamingConsole {
    void up();
    void down();
    void left();
    void right();
}

package com.example.demo.game;

public class SuperContraGame implements GamingConsole {

    public void up() {
        System.out.println("up");
    }

    public void down() {
        System.out.println("down");
    }

    public void left() {
        System.out.println("left");
    }

    public void right() {
        System.out.println("right");
    }
}

package com.example.demo;

import com.example.demo.game.GameRunner;
import com.example.demo.game.MarioGame;
import com.example.demo.game.SuperContraGame;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class DemoApplication {
    public static void main(String[] args) {
//        MarioGame game = new MarioGame();
        SuperContraGame game = new SuperContraGame();
        GameRunner runner = new GameRunner(game);
        runner.run();
    }
}