通过IDEA创建spring boot的web项目

1.Fle->New->Project,选择Maven，点击Next

2.修改项目名称，点击Finish

3.项目创建完毕，等待Maven下载完成

4.修改pom.xml文件，改成如下内容

<?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><groupId>org.example</groupId><artifactId>hello</artifactId><version>1.0-SNAPSHOT</version><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter</artifactId><version>2.3.7.RELEASE</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId><version>2.3.7.RELEASE</version></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><version>2.3.3.RELEASE</version><executions><execution><goals><goal>repackage</goal></goals></execution></executions><configuration><mainClass>com.demo.DemoApplication</mainClass></configuration></plugin><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><configuration><source>8</source><target>8</target></configuration></plugin></plugins></build>
</project>

5.创建一个package，com.demo，然后创建一个java程序DemoApplication，代码如下，等待Maven下载完毕

package com.demo;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication
public class DemoApplication {public static void main(String[] args) {SpringApplication.run(DemoApplication.class, args);}
}

6.tomcat默认端口号是8080，如果需要修改，可以自行配置端口号，首先在resources目录下创建一个新的file，名称填resource.properties，内容填写deploy.mode=application

7.在resources目录下创建一个新的文件夹config，然后创建一个新的文件application.yml，比如默认端口号改成8808，web项目跟路径改成hello

server:port: 8808servlet:context-path: /hellospring:profiles:active: hello

8.创建一个java类HelloController，代码如下

package com.demo;import org.springframework.web.bind.annotation.*;@RestController
@RequestMapping("/hello")
public class HelloController {@GetMapping("/sayHello")public @ResponseBodyString sayHello( @RequestParam(name = "name") String name) {return "hello:"+name;}
}

9.右键点击HelloController，Run，浏览器输入http://localhost:8808/hello/hello/sayHello?name=123即可看到效果