学习Spring Cloud(三): Spring Boot

Spring Boot以“约定大于配置”的思想简化了Spring的开发，使其能够“开箱即用”。

项目结构

项目结构

• src/main/java中包含主程序入口DemoApplication.java (文件名随项目名可变)
• src/main/resources用于存放配置信息
• src/test为单元测试目录

小记 VSCode 开发 Spring Boot

0 基本环境预备

• 安装JDK
• 安装Maven
• 配置Maven镜像（推荐阿里云）

1 settings.json

{
    "editor.suggestSelection": "first",
    "vsintellicode.modify.editor.suggestSelection": "automaticallyOverrodeDefaultValue",
    "java.errors.incompleteClasspath.severity": "ignore",
    "java.home":"/Library/Java/JavaVirtualMachines/adoptopenjdk-11.jdk/Contents/Home",
    "java.configuration.maven.userSettings": "/Library/apache-maven-3.6.3/conf/settings.xml",
    "maven.executable.path": "/Library/apache-maven-3.6.3/bin/mvn",
    "maven.terminal.useJavaHome": true,
    "maven.terminal.customEnv": [
        {
        "environmentVariable": "JAVA_HOME",
        "value": "/Library/Java/JavaVirtualMachines/adoptopenjdk-11.jdk/Contents/Home"
        }
    ],
}

2 插件

• Spring Boot Tools
• Spring Boot Extension Pack
• Java Extension Pack
• Debugger for Java

3 新建项目

• control+shift+p create spring boot project
  选择 maven
  选择 starters (starter POMs 是一系列轻便的包，用于)
  生成项目
• 开始运行调试

访问 localhost:8080

证明程序启动成功。

4 Hello World

在 DemoApplication.java所在目录下新建 controller/HelloController.java

package test.com.example.demo.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
@RequestMapping("/")
public class HelloController {
    @Autowired

    @RequestMapping("/hello")
    @ResponseBody
    public String helloWorld(){
        return "Hello World!";
    }
}

访问 localhost:8080/hello

Hello World