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时间来到2022-3-25，好久没上官网，springBoot竟然出到3.0 M1。我用的最多的版本是2.2.2

Spring Boot Reference Documentation



https://docs.spring.io/spring-boot/docs/3.0.0-M2/reference/htmlsingle



以下内容均是归纳整理。截图出于上面的连接，

1、概览：第一步，升级旧版，开发，特色，web,数据，消息，IO，镜像，高级。

2、第一步：Getting Started

$ java -version

4.4.1. Creating the POM

mvn dependency:tree

@RestController
@EnableAutoConfiguration
public class MyApplication {

    @RequestMapping("/")
    String home() {
        return "Hello World!";
    }

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

}

mvn spring-boot:run
mvn package     The file should be around 10 MB in size.
jar tvf target/myproject-0.0.1-SNAPSHOT.jar
$ java -jar target/myproject-0.0.1-SNAPSHOT.jar

Spring Boot Maven Plugin Documentation



https://docs.spring.io/spring-boot/docs/3.0.0-M2/maven-plugin/reference/htmlsingle/



6.1.5. Starters

6.2.2. Locating the Main Application Class:The

@SpringBootApplication annotation

is often placed on your main class

6.3. Configuration Classes:we generally recommend that your primary source be a single

@Configuration

class. Usually the class that defines the

main

method is a good candidate as the primary

@Configuration

.

6.5.  Beans 和 依赖注入

We generally recommend using constructor injection to wire up dependencies and @ComponentScan to find beans. You can add @ComponentScan without any arguments or use the @SpringBootApplication annotation which implicitly includes it.  All of your application components (@Component, @Service, @Repository, @Controller, and others) are automatically registered as Spring Beans.

6.6. Using the @SpringBootApplication Annotation :三个（@EnableAutoConfiguration，@ComponentScan，@SpringBootConfiguration）

6.7. Running Your Application

IDE：select

Import…​

→

Existing Maven Projects

from the

File

menu

Relaunch

button

PackagedApplication: $ java -jar target/myapplication-0.0.1-SNAPSHOT.jar

java -Xdebug -Xrunjdwp:server=y,transport=dt_socket,address=8000,suspend=n \ -jar target/myapplication-0.0.1-SNAPSHOT.jar

MavenPlugin:  mvn spring-boot:run     export MAVEN_OPTS=-Xmx1024m

HotSwapping：热重载

spring-boot-devtools

,  Devtools works by monitoring the classpath for changes.

Spring Boot Reference Documentation



https://docs.spring.io/spring-boot/docs/3.0.0-M2/reference/htmlsingle/#using.devtools.livereload

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <optional>true</optional>
    </dependency>
</dependencies>


spring.devtools.add-properties

to

false

in your

application.properties

.

you can turn on the

spring.mvc.log-request-details

or

spring.codec.log-request-details

configuration properties.

spring.devtools.restart.exclude=static/**,public/**

System.setProperty(“spring.devtools.restart.enabled”, “false”);

Executable jars can be used for production deployment.

7. Core Features

banner.txt

SpringApplication.setBanner(…​)

method

Use the

org.springframework.boot.Banner

interface

The printed banner is registered as a singleton bean under the following name:

springBootBanner

.

@SpringBootApplication
public class MyApplication {

    public static void main(String[] args) {
        SpringApplication application = new SpringApplication(MyApplication.class);
        application.setBannerMode(Banner.Mode.OFF);
        application.run(args);
    }

}

new SpringApplicationBuilder()
        .sources(Parent.class)
        .child(Application.class)
        .bannerMode(Banner.Mode.OFF)
        .run(args);

 Spring MVC  AnnotationConfigServletWebServerApplicationContext is used

 Spring WebFlux  AnnotationConfigReactiveWebServerApplicationContext is used

Otherwise, AnnotationConfigApplicationContext is used

获取参数

@Component
public class MyBean {

    public MyBean(ApplicationArguments args) {
        boolean debug = args.containsOption("debug");
        List<String> files = args.getNonOptionArgs();
        if (debug) {
            System.out.println(files);
        }
        // if run with "--debug logfile.txt" prints ["logfile.txt"]
    }

}

附加任务

@Component
public class MyCommandLineRunner implements CommandLineRunner {

    @Override
    public void run(String... args) {
        // Do something...
    }

}

程序退出

@SpringBootApplication
public class MyApplication {

    @Bean
    public ExitCodeGenerator exitCodeGenerator() {
        return () -> 42;
    }

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

}

其他设置方法：

SpringApplication.setDefaultProperties

@PropertySource

annotations on your

@Configuration

classes

Config data (such as

application.properties

files)

A

RandomValuePropertySource

that has properties only in

random.*


@Component
public class MyBean {

    @Value("${name}")
    private String name;

    // ...

}

for example,

java -jar app.jar --name="Spring"

).

SpringApplication.setAddCommandLineProperties(false)

$ SPRING_APPLICATION_JSON='{"my":{"name":"test"}}' java -jar myapp.jar
$ java -Dspring.application.json='{"my":{"name":"test"}}' -jar myapp.jar
$ java -jar myapp.jar --spring.application.json='{"my":{"name":"test"}}'

加密属性

the

Spring Cloud Vault

project provides support for storing externalized configuration in

HashiCorp Vault

.

See

Customize the Environment or ApplicationContext Before It Starts

for details.

7.3 @Profile(“production”)

Any

@Component

,

@Configuration

or

@ConfigurationProperties

can be marked with

@Profile

to limit when it is loaded,

@Configuration(proxyBeanMethods = false)
@Profile("production")
public class ProductionConfiguration {

    // ...

}

线程池

spring.task.execution.pool.max-size=16
spring.task.execution.pool.queue-capacity=100
spring.task.execution.pool.keep-alive=10s

8、Web

spring-boot-starter-web

spring-boot-starter-webflux (

reactive web

)


8.1 servlet-based web applications   Spring MVC lets you create special

@Controller

or

@RestController

beans to handle incoming HTTP requests. Methods in your controller are mapped to HTTP by using

@RequestMapping

annotations.

Spring MVC is part of the core Spring Framework,

@Configuration(proxyBeanMethods = false)
public class MyCorsConfiguration {

    @Bean
    public WebMvcConfigurer corsConfigurer() {
        return new WebMvcConfigurer() {

            @Override
            public void addCorsMappings(CorsRegistry registry) {
                registry.addMapping("/api/**");
            }

        };
    }

}

9 Data:

10 Messaging

11 IO   缓存 ， 定时 任务 发邮件 校验，webServices 订阅，

12  docker

13 生产准备特色

spring-boot-starter-actuator

14 部署

15： Cli

16: Plug

17 How to Guides

1、概览：

属性绑定，热部署，源码导入，自动配置，数据源，mp,web组件，MVC,模版，redis,消息，docker,jenkins, SpringCloud

.

2、比较权威的springBoot介绍：

3、环境要求：

Spring Boot Reference Documentation

4、热部署：

ctrl+shift+alt+/      compaire.autoMake.

配置文件放置位置4个。   file./config >  file.   > config/  >  ./

5、核心特色：

1. 1：SpringBootAppliction   自定义bannner ,K8s状态Application Availability State

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

   2、外部化配置

   spring:
     application:
       name: "myapp"
     config:
       import: "optional:file:./dev.properties"
   
   
   spring:
     config:
       import: "file:/etc/config/myconfig[.yaml]"
   
   
   k8s:
   etc/
     config/
       myapp/
         username
         password
   
   
   app:
     name: "MyApp"
     description: "${app.name} is a Spring Boot application"
   
   my:
     secret: "${random.value}"
     number: "${random.int}"
     bignumber: "${random.long}"
     uuid: "${random.uuid}"
     number-less-than-ten: "${random.int(10)}"
     number-in-range: "${random.int[1024,65536]}"

   3、@Profile(“production”)

   4、任务执行和调度

   1. spring:
        task:
          execution:
            pool:
              max-size: 16
              queue-capacity: 100
              keep-alive: "10s"
      
      
      spring:
        task:
          scheduling:
            thread-name-prefix: "scheduling-"
            pool:
              size: 2

      5、Test:

   2. @SpringBootTest
      @AutoConfigureMockMvc
      class MyMockMvcTests {
      
          @Test
          void testWithMockMvc(@Autowired MockMvc mvc) throws Exception {
              mvc.perform(get("/")).andExpect(status().isOk()).andExpect(content().string("Hello World"));
          }
      
          // If Spring WebFlux is on the classpath, you can drive MVC tests with a WebTestClient
          @Test
          void testWithWebTestClient(@Autowired WebTestClient webClient) {
              webClient
                      .get().uri("/")
                      .exchange()
                      .expectStatus().isOk()
                      .expectBody(String.class).isEqualTo("Hello World");
          }
      
      }
      
      
      class MyTests {
      
          private TestRestTemplate template = new TestRestTemplate();
      
          @Test
          void testRequest() throws Exception {
              ResponseEntity<String> headers = this.template.getForEntity("https://myhost.example.com/example", String.class);
              assertThat(headers.getHeaders().getLocation()).hasHost("other.example.com");
          }
      
      }

      5、Web