springBoot3集成knife4j的全过程，要详细详细的步骤

1. 添加依赖

在`pom.xml`文件中添加以下依赖：

<!-- Swagger UI -->
<dependency>
    <groupId>com.github.xiaoymin</groupId>
    <artifactId>swagger-bootstrap-ui</artifactId>
    <version>1.9.6</version>
</dependency>

<!-- Knife4j -->
<dependency>
    <groupId>com.github.xiaoymin</groupId>
    <artifactId>knife4j-spring-boot-starter</artifactId>
    <version>3.0.0</version>
</dependency>

2. 配置Swagger

在`application.yml`文件中添加以下配置：

spring:
  profiles:
    active: dev

  application:
    name: demo

  swagger:
    title: Demo API
    description: Demo API Document
    version: 1.0
    contact:
      name: Demo Team
      url: https://www.demo.com
      email: demo@demo.com
    base-package: com.demo.controller
    enable: true
    host: localhost:8080

3. 配置Knife4j

在`application.yml`文件中添加以下配置：

knife4j:
  swagger-ui:
    title: Demo API
    description: Demo API Document
    version: 1.0
    contact:
      name: Demo Team
      url: https://www.demo.com
      email: demo@demo.com
    enable: true
    host: localhost:8080

4. 编写Controller

@RestController
@Api(tags = "Demo API")
public class DemoController {

    @ApiOperation(value = "获取用户信息", notes = "根据用户ID获取用户信息")
    @ApiImplicitParam(name = "id", value = "用户ID", required = true, dataType = "Long")
    @GetMapping("/user/{id}")
    public User getUser(@PathVariable Long id) {
        User user = new User();
        user.setId(id);
        user.setName("Demo");
        user.setAge(18);
        return user;
    }

}

5. 启动应用

启动应用后，在浏览器中访问`http://localhost:8080/doc.html`即可看到Swagger UI界面。