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本次我重新更新是发现现在好多文章，写的文章都很松散，这次我准备从SpringBoot开始介绍，然后介绍SpringCloud一直到前后端分离，希望大家可以进行关注。
SpringBoot初始化
1.SpringBoot创建方法
SpringBoot有三种方式进行创建分别是：
- Spring Initializr(Web 界面)
- SpringBoot ClI (命令行)
- Soring Boot IDEA(Eclipse、IntelliJ IDEA等)
一般来说创建SpringBoot的构建类型可以是Maven或者Gradle，可以自由选择自己喜欢的方式，一般我选择Java的Maven工程比较多。
Springboot执行过程如下：
2.SpringBoot创建的三种方式
2.1 Spring Initializr创建SpringBoot
通过访问https://start.spring.io/地址进行创建SpringBoot
将代码进行解压F:\Java_File\myfirst-springboot-demo1\myfirst-springboot-demo1，然后通过“mvn spring-boot:run”进行启动。
cd F:\Java_File\myfirst-springboot-demo1\myfirst-springboot-demo1
mvn spring-boot:run
运行结果
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.6.3)
2022-02-14 16:12:05.920 INFO 33816 --- [ main] c.m.s.MyfirstSpringbootDemo1Application : Starting MyfirstSpringbootDemo1Application using Java 1.8.0_291 on dq18-180454w with PID 33816 (F:\Java_File\myfirst-springboot-demo1\myfirst-springboot-demo1\target\classes started by 180454 in F:\Java_File\myfirst-springboot-demo1\myfirst-springboot-demo1)
2022-02-14 16:12:05.922 INFO 33816 --- [ main] c.m.s.MyfirstSpringbootDemo1Application : No active profile set, falling back to default profiles: default
2022-02-14 16:12:06.934 INFO 33816 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2022-02-14 16:12:06.942 INFO 33816 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2022-02-14 16:12:06.942 INFO 33816 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.56]
2022-02-14 16:12:07.447 INFO 33816 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2022-02-14 16:12:07.447 INFO 33816 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1489 ms
2022-02-14 16:12:07.730 INFO 33816 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2022-02-14 16:12:07.739 INFO 33816 --- [ main] c.m.s.MyfirstSpringbootDemo1Application : Started MyfirstSpringbootDemo1Application in 2.199 seconds (JVM running for 3.735)
2022-02-14 16:12:19.518 INFO 33816 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2022-02-14 16:12:19.518 INFO 33816 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2022-02-14 16:12:19.524 INFO 33816 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 0 ms
2.2 Spring Boot CLI创建项目
下载并安装SpringBoot ClI
(1) 从官网下载spring-boot-cli-2.6.3-bin.zip
https://repo.spring.io/artifactory/release/org/springframework/boot/spring-boot-cli/2.6.3/spring-boot-cli-2.6.3-bin.zip
选择对应的版本
(2) 解压到 D:\software\exe\
(3) 将D:\software\exe\spring-boot-cli-2.6.3-bin\spring-2.6.3\bin 添加到环境变量PATH里。
(4) 打开cmd
C:\Users\Administrator>spring --version
Spring CLI v2.6.3
创建SpringBoot并运行
D:\software\file\java>mkdir spring-myfirst-demo2
D:\software\file\java>cd spring-myfirst-demo2
D:\software\file\java\spring-myfirst-demo2>spring init -d=web -g=com.myfirst.springboot -a=spring-myfirst-demo2 --package-name=com.myfirst.springboot --name=spring-myfirst-demo2 --javaVersion=8
Using service at https://start.spring.io
Project extracted to 'D:\software\file\java\spring-myfirst-demo2'
D:\software\file\java\spring-myfirst-demo2>mvn spring-boot:run
运行结果
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.6.3)
2022-02-14 21:03:21.017 INFO 83252 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1434 ms
2022-02-14 21:03:21.220 INFO 83252 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2022-02-14 21:03:21.227 INFO 83252 --- [ main] c.m.s.SpringMyfirstDemo2Application : Started SpringMyfirstDemo2Application in 2.149 seconds (JVM running for 2.555)
Spring init命令参数
-d（dependencies 依赖包）
-g（Group Id）
-a（Artifact Id）
--package-name（Package name）
--name（Project name）
-x（Extract compatible archives）
查看对应的命令帮助
spring help init
查看所有可用依赖:
Parameters
+-------------+------------------------------------------+------------------------------+
| Id | Description | Default value |
+-------------+------------------------------------------+------------------------------+
| artifactId | project coordinates (infer archive name) | demo |
| bootVersion | spring boot version | 2.6.3 |
| description | project description | Demo project for Spring Boot |
| groupId | project coordinates | com.example |
| javaVersion | language level | 11 |
| language | programming language | java |
| name | project name (infer application name) | demo |
| packageName | root package | com.example.demo |
| packaging | project packaging | jar |
| type | project type | maven-project |
| version | project version | 0.0.1-SNAPSHOT |
+-------------+------------------------------------------+------------------------------+
2.3 IDEA创建SpringBoot项目
2.3.1创建过程如图所示
初始化Spring Initializr
SpringBoot项目命名
选择相关依赖
生成的项目目录
运行项目结果：
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.6.3)
2022-02-14 16:42:29.198 INFO 31784 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1979 ms
2022-02-14 16:42:29.645 INFO 31784 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2022-02-14 16:42:29.653 INFO 31784 --- [ main] c.m.s.SpringBootDemo3Application : Started SpringBootDemo3Application in 2.897 seconds (JVM running for 5.56)
2.4访问运行地址
访问 http://localhost:8080/，结果为：
报错的原因：这是因为现在项目中还没有存在任何一个Controller,所以只能看到404页面
2.5 SpringBoot项目文件夹构成介绍
SpringBootDemo3Application是项目的启动项代码如下：
@SpringBootApplication
public class SpringBootDemo3Application {
public static void main(String[] args) {
SpringApplication.run(SpringBootDemo3Application.class, args);
}
}
@SpringBootApplication = @Configuration + @ComponentScan + @EnableAutoConfiration
默认扫描的package是Application类所在的package.
2.6添加一个TestController
代码如下：
package com.myfirst.springboot.controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
/**
* @program: spring-boot-demo3
* @package: com.myfirst.springboot.controller
* @classname: TestController
* @description: test
* @author: zbb
* @create: 2022-02-14
*/
@RestController
public class TestController {
@RequestMapping("/")
public String testIndex(){
return "This is a Test index";
}
}
访问 http://localhost:8080/，结果为：
注：如果存在多个MAIN函数，可能需要指定启动类
xml代码
<properties>
<!-- The main class to start by executing java -jar -->
<start-class>com.myfirst.springboot.SpringBootDemo3Application</start-class>
</properties>
或者
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<mainClass>com.myfirst.springboot.SpringBootDemo3Application</mainClass>
</configuration>
</plugin>
</plugins>
</build>
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