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Spring Boot学习第一天

分类: 文章 • 2024-03-12 22:12:08

1.spring initializer

bootstrap your application now
https://start.spring.io/
Spring Boot学习第一天

2.spring boot

Build Anything with Spring Boot：Spring Boot is the starting point for building all Spring-based applications. Spring Boot is designed to get you up and running as quickly as possible, with minimal upfront configuration of Spring.

2.1什么是spring boot?

  • 它使用 “习惯优于配置” （项目中存在大量的配置，此外还内置一个习惯性的配置，让你无须）的理念让你的项目快速运行起来。
  • 它并不是什么新的框架，而是默认配置了很多框架的使用方式，就像 Maven 整合了所有的 jar 包一样，Spring Boot 整合了所有框架

2.2使用 Spring Boot 有什么好处

回顾我们之前的 SSM 项目，搭建过程还是比较繁琐的，需要：

  • 1）配置 web.xml，加载 spring 和 spring mvc
  • 2）配置数据库连接、配置日志文件
  • 3）配置家在配置文件的读取，开启注解
  • 4）配置mapper文件
  • 而使用 Spring Boot 来开发项目则只需要非常少的几个配置就可以搭建起来一个 Web 项目，并且利用 IDEA 可以自动生成生成，这简直是太爽了…
  • 划重点：简单、快速、方便地搭建项目；对主流开发框架的无配置集成；极大提高了开发、部署效率。

3.快速搭建

  • 访问 https://start.spring.io
  • 在线下载maven工程
  • 导入maven工程，自动补齐jar
  • 建议使用maven国内源，最好的是阿里源

3.1 pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.1.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>cn.goingtodo</groupId>
    <artifactId>mdblog</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>mdblog</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!-- spring boot web 模块-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

3.2 MdblogApplication

package cn.goingtodo.mdblog;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class MdblogApplication {

    public static void main(String[] args) {

        SpringApplication.run(MdblogApplication.class, args);
    }

}

3.3 HelloController

package cn.goingtodo.mdblog;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {

    @RequestMapping("/hello")
    public String Hello() {
        return "Hello Spring Boot!"+name +age;
    }

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

3.4 启动

运行MdblogApplication
http://localhost:8080/hello
“C:\Program Files\Java\jdk1.8.0_131\bin\java.exe” -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=59396 -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Djava.rmi.server.hostname=localhost -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true “-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2018.2.5\lib\idea_rt.jar=59397:C:\Program Files\JetBrains\IntelliJ IDEA 2018.2.5\bin” -Dfile.encoding=UTF-8 -classpath “C:\Program Files\Java\jdk1.8.0_131\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\rt.jar;C:\springinit\mdblog\target\classes;D:\maven\repository\org\springframework\boot\spring-boot-starter\2.1.1.RELEASE\spring-boot-starter-2.1.1.RELEASE.jar;D:\maven\repository\org\springframework\boot\spring-boot\2.1.1.RELEASE\spring-boot-2.1.1.RELEASE.jar;D:\maven\repository\org\springframework\spring-context\5.1.3.RELEASE\spring-context-5.1.3.RELEASE.jar;D:\maven\repository\org\springframework\boot\spring-boot-autoconfigure\2.1.1.RELEASE\spring-boot-autoconfigure-2.1.1.RELEASE.jar;D:\maven\repository\org\springframework\boot\spring-boot-starter-logging\2.1.1.RELEASE\spring-boot-starter-logging-2.1.1.RELEASE.jar;D:\maven\repository\ch\qos\logback\logback-classic\1.2.3\logback-classic-1.2.3.jar;D:\maven\repository\ch\qos\logback\logback-core\1.2.3\logback-core-1.2.3.jar;D:\maven\repository\org\apache\logging\log4j\log4j-to-slf4j\2.11.1\log4j-to-slf4j-2.11.1.jar;D:\maven\repository\org\apache\logging\log4j\log4j-api\2.11.1\log4j-api-2.11.1.jar;D:\maven\repository\org\slf4j\jul-to-slf4j\1.7.25\jul-to-slf4j-1.7.25.jar;D:\maven\repository\javax\annotation\javax.annotation-api\1.3.2\javax.annotation-api-1.3.2.jar;D:\maven\repository\org\springframework\spring-core\5.1.3.RELEASE\spring-core-5.1.3.RELEASE.jar;D:\maven\repository\org\springframework\spring-jcl\5.1.3.RELEASE\spring-jcl-5.1.3.RELEASE.jar;D:\maven\repository\org\yaml\snakeyaml\1.23\snakeyaml-1.23.jar;D:\maven\repository\org\slf4j\slf4j-api\1.7.25\slf4j-api-1.7.25.jar;D:\maven\repository\org\springframework\boot\spring-boot-starter-web\2.1.1.RELEASE\spring-boot-starter-web-2.1.1.RELEASE.jar;D:\maven\repository\org\springframework\boot\spring-boot-starter-json\2.1.1.RELEASE\spring-boot-starter-json-2.1.1.RELEASE.jar;D:\maven\repository\com\fasterxml\jackson\core\jackson-databind\2.9.7\jackson-databind-2.9.7.jar;D:\maven\repository\com\fasterxml\jackson\core\jackson-annotations\2.9.0\jackson-annotations-2.9.0.jar;D:\maven\repository\com\fasterxml\jackson\core\jackson-core\2.9.7\jackson-core-2.9.7.jar;D:\maven\repository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.9.7\jackson-datatype-jdk8-2.9.7.jar;D:\maven\repository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.9.7\jackson-datatype-jsr310-2.9.7.jar;D:\maven\repository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.9.7\jackson-module-parameter-names-2.9.7.jar;D:\maven\repository\org\springframework\boot\spring-boot-starter-tomcat\2.1.1.RELEASE\spring-boot-starter-tomcat-2.1.1.RELEASE.jar;D:\maven\repository\org\apache\tomcat\embed\tomcat-embed-core\9.0.13\tomcat-embed-core-9.0.13.jar;D:\maven\repository\org\apache\tomcat\embed\tomcat-embed-el\9.0.13\tomcat-embed-el-9.0.13.jar;D:\maven\repository\org\apache\tomcat\embed\tomcat-embed-websocket\9.0.13\tomcat-embed-websocket-9.0.13.jar;D:\maven\repository\org\hibernate\validator\hibernate-validator\6.0.13.Final\hibernate-validator-6.0.13.Final.jar;D:\maven\repository\javax\validation\validation-api\2.0.1.Final\validation-api-2.0.1.Final.jar;D:\maven\repository\org\jboss\logging\jboss-logging\3.3.2.Final\jboss-logging-3.3.2.Final.jar;D:\maven\repository\com\fasterxml\classmate\1.4.0\classmate-1.4.0.jar;D:\maven\repository\org\springframework\spring-web\5.1.3.RELEASE\spring-web-5.1.3.RELEASE.jar;D:\maven\repository\org\springframework\spring-beans\5.1.3.RELEASE\spring-beans-5.1.3.RELEASE.jar;D:\maven\repository\org\springframework\spring-webmvc\5.1.3.RELEASE\spring-webmvc-5.1.3.RELEASE.jar;D:\maven\repository\org\springframework\spring-aop\5.1.3.RELEASE\spring-aop-5.1.3.RELEASE.jar;D:\maven\repository\org\springframework\spring-expression\5.1.3.RELEASE\spring-expression-5.1.3.RELEASE.jar” cn.goingtodo.mdblog.MdblogApplication

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.1.1.RELEASE)

2018-12-17 22:30:55.870  INFO 5044 --- [           main] cn.goingtodo.mdblog.MdblogApplication    : Starting MdblogApplication on livingbody-PC with PID 5044 (C:\springinit\mdblog\target\classes started by livingbody in C:\springinit\mdblog)
2018-12-17 22:30:55.870  INFO 5044 --- [           main] cn.goingtodo.mdblog.MdblogApplication    : No active profile set, falling back to default profiles: default
2018-12-17 22:30:56.960  INFO 5044 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2018-12-17 22:30:56.991  INFO 5044 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2018-12-17 22:30:56.991  INFO 5044 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/9.0.13
2018-12-17 22:30:56.991  INFO 5044 --- [           main] o.a.catalina.core.AprLifecycleListener   : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [C:\Program Files\Java\jdk1.8.0_131\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\WIDCOMM\Bluetooth Software\;C:\Program Files\WIDCOMM\Bluetooth Software\syswow64;C:\Program Files\Microsoft VS Code\bin;C:\Program Files\Pandoc\;C:\Program Files\Git\cmd;C:\Program Files\Calibre2\;C:\Program Files\Andy;C:\Windows\SysWOW64;C:\Windows\System32;C:\Windows\SysWOW64\wbem;C:\Windows\System32\wbem;C:\Windows\SysWOW64\WindowsPowerShell\v1.0\;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\;C:\Program Files\nodejs\;C:\Go\bin;C:\Python37-32\Scripts\;C:\Python37-32\;C:\Users\livingbody\AppData\Local\Programs\Microsoft VS Code\bin;C:\Program Files\Pandoc;C:\Program Files (x86)\TeXworks;C:\Users\livingbody\AppData\Local\Programs\MiKTeX 2.9\miktex\bin\x64\;C:\Program Files\Java\jdk1.8.0_131\bin;C:\Users\livingbody\AppData\Roaming\npm;D:\software\apache-maven-3.5.4\bin;%GOPATH%\bin;.]
2018-12-17 22:30:57.084  INFO 5044 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2018-12-17 22:30:57.084  INFO 5044 --- [           main] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 1167 ms
2018-12-17 22:30:57.318  INFO 5044 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2018-12-17 22:30:57.584  INFO 5044 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2018-12-17 22:30:57.584  INFO 5044 --- [           main] cn.goingtodo.mdblog.MdblogApplication    : Started MdblogApplication in 2.359 seconds (JVM running for 4.953)
2018-12-17 22:31:27.935  INFO 5044 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring DispatcherServlet 'dispatcherServlet'
2018-12-17 22:31:27.936  INFO 5044 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'
2018-12-17 22:31:27.942  INFO 5044 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Completed initialization in 6 ms

3.5 application.yml

server:
  port: 8080
name: 梦蛟龙
age: 35
content: "name:${name}, age:${age}"

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