Spring Boot

Spring Boot 可以轻松创建独立的、生产级的基于 Spring 的应用程序，您可以“直接运行”这些应用程序。

我们对 Spring 平台和第三方库采取了固执的观点，因此您可以轻松上手。大多数 Spring Boot 应用程序需要最少的 Spring 配置。

如果您正在寻找有关特定版本的信息，或有关如何从早期版本升级的说明。

特征

创建独立的 Spring 应用程序
直接嵌入Tomcat、Jetty或Undertow（无需部署WAR文件）
提供自以为是的“入门”依赖项以简化您的构建配置
尽可能自动配置 Spring 和 3rd 方库
提供生产就绪功能，例如指标、运行状况检查和外部化配置
完全不需要代码生成，也不需要 XML 配置

入门

Quickstart Guide

创建一个hello

创建项目

添加代码

package org.akachi.springbootquickstartguide;

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

@SpringBootApplication
@RestController("/hello")
public class SpringBootQuickstartGuideApplication {

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

    @GetMapping
    public String hello(@RequestParam(value="name" ,defaultValue = "spring") String name){
        return String.format("hello %s!",name);
    }
}

Building an Application with Spring Boot

查看容器中的bean

package com.example.springboot;

import java.util.Arrays;

import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Bean;

@SpringBootApplication
public class Application {

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

	@Bean
	public CommandLineRunner commandLineRunner(ApplicationContext ctx) {
		return args -> {

			System.out.println("Let's inspect the beans provided by Spring Boot:");

			String[] beanNames = ctx.getBeanDefinitionNames();
			Arrays.sort(beanNames);
			for (String beanName : beanNames) {
				System.out.println(beanName);
			}

		};
	}

}

添加springtest

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

测试代码

package org.akachi.buildinganapplicationwithspringboot;


import static org.hamcrest.Matchers.equalTo;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;

import org.junit.jupiter.api.Test;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.http.MediaType;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;

/**
 * @Author akachi
 * @Email zsts@hotmail.com
 * @Date 2021/10/5 11:07
 */
@SpringBootTest
@AutoConfigureMockMvc
public class HelloControllerTest {
    @Autowired
    private MockMvc mvc;

    @Test
    public void getHello() throws Exception {
        mvc.perform(
                MockMvcRequestBuilders.get("/").accept(MediaType.APPLICATION_JSON))
                .andExpect(status().isOk())
                .andExpect(content().string(equalTo("Greetings from Spring Boot!"))
                );
    }
}

actuator

会显示项目健康状态

1 2	http://localhost:18081/actuator http://localhost:18081/actuator/health

您可以通过运行以下命令来检查应用程序的运行状况：

1 2	$ curl 192.168.3.148:18081/actuator/health {"status":"UP"}

1 2	curl -X POST 192.168.3.148:18081/actuator/shutdown {"timestamp":"2021-10-05T06:44:20.117+00:00","status":404,"error":"Not Found","path":"/actuator/shutdown"}[root@AKACHI-PC-2018 dell]#

spring boot starters

1	https://docs.spring.io/spring-boot/docs/2.5.0/reference/htmlsingle/#using.build-systems.starters

通过spring命令启动

安装以下内容并且配置环境变量

1	https://docs.spring.io/spring-boot/docs/2.5.0/reference/htmlsingle/#getting-started.installing.cli

创建文件 app.groovy写入以下内容

@RestController
class ThisWillActuallyRun {

    @GetMapping("/")
    String home() {
        return "Hello, World!"
    }
}

执行

1	$ spring run app.groovy

参考资料

docs: https://spring.io/projects/spring-boot