体验Spring boot 零配置开发微服务

2018年12月29日星期六

体验spring boot 零配置开发微服务

1.为什么要用spring  boot？

　　　1.1 简单方便、配置少、整合了大多数框架

　　　1.2 适用于微服务搭建，搭建的微服务与spring clound进行完美融合，因为都是spring家族

2. spring boot开发过程

2.1 启动idea

2.2 创建maven项目

2.3 引入核心：starter for building web, including restful, applications using spring mvc. uses tomcat as the default embedded container

2.4 引入spring-boot-starter-test核心：starter for testing spring boot applications with libraries including junit, hamcrest and mockito

2.5 具体依赖如下：

2.6 <dependency>
    <groupid>org.springframework.boot</groupid>
    <artifactid>spring-boot-starter-web</artifactid>
    <version>2.0.4.release</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-test -->
<dependency>
    <groupid>org.springframework.boot</groupid>
    <artifactid>spring-boot-starter-test</artifactid>
    <version>2.0.4.release</version>
    <scope>test</scope>
</dependency>

2.7 创建spring boot启动主程序：package com.wuji.boot;

import org.springframework.boot.springapplication;
import org.springframework.boot.autoconfigure.springbootapplication;
import org.springframework.context.annotation.componentscan;

@springbootapplication
@componentscan(basepackages = {"com.wuji.controller"})
public class application {
    public static void main(string[] args) {
        springapplication.run(application.class,args);
    }
}

2.8 编写hellocontroller:

package com.wuji.controller;
import org.springframework.web.bind.annotation.requestmapping;
import org.springframework.web.bind.annotation.restcontroller;

@restcontroller
@requestmapping("/api")
public class hellocontroller {
    @requestmapping("/hello")
    public string index(){
        return "hello";
    }
}

2.9 运行http://localhost:8080/api/hello

2.10 第一次写spring boot程序运行一般会出现：whitelabel error page 这个错误，是因为默认没有加载控制器包。要在主程序加上@componentscan(basepackages = {"com.wuji.controller"})注解

2.11 总结：整个程序只引用了两个核心包2.3，2.4，没有其它配置，就可以启动restful服务。所以证实了spring boot基本零配置来开发微服务。