参考：

参数类型 dataType 设置：https://blog.csdn.net/qq_39393671/article/details/103307690

依赖

<dependency>
    <groupId>io.springfox</groupId>
    <artifactId>springfox-swagger2</artifactId>
    <version>2.9.2</version>
    <exclusions>
        <exclusion>
            <groupId>io.swagger</groupId>
            <artifactId>swagger-models</artifactId>
        </exclusion>
    </exclusions>
</dependency>
<dependency>
    <groupId>io.swagger</groupId>
    <artifactId>swagger-models</artifactId>
    <version>1.5.22</version>
</dependency>
<dependency>
    <groupId>io.springfox</groupId>
    <artifactId>springfox-swagger-ui</artifactId>
    <version>2.9.2</version>
</dependency>

SwaggerConfig.java

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.service.Contact;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;

/**
 * @Author 风仔
 * @Date 2022/6/23
 * @Version 1.0
 * @Description:
 **/
@Configuration
@EnableSwagger2
public class SwaggerConfig {
    @Bean
    public Docket createRestApi() {
        return new Docket(DocumentationType.SWAGGER_2)
                .pathMapping("/")
                .select()
                .apis(RequestHandlerSelectors.basePackage("com.jbritian.springdatajpa.web.rest")) // 控制层路径
                .paths(PathSelectors.any())
                .build().apiInfo(new ApiInfoBuilder()
                        .title("SpringBoot整合Swagger")
                        .description("SpringBoot整合Swagger，详细信息......")
                        .version("1.0")
                        .contact(new Contact("啊啊啊啊","blog.csdn.net","aaa@gmail.com"))
                        .license("The Apache License")
                        .licenseUrl("http://www.baidu.com")
                        .build());
    }
}

SwaggerResource.java

import io.swagger.annotations.*;
import org.springframework.web.bind.annotation.*;
import springfox.documentation.annotations.ApiIgnore;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @Author 风仔
 * @Date 2022/6/23
 * @Version 1.0
 * @Description:
 **/
@RestController
@Api(tags = "swagger测试接口")
public class SwaggerResource {

    @ApiOperation(value = "根据用户id查询用户信息", notes = "查询用户信息")
    @ApiImplicitParam(name = "id", value = "用户id", required = true, dataType = "Int")
    @GetMapping(value = "/findById")
    public Integer findById(@RequestParam(value = "id") Integer id) {
        System.err.println(id);
        return id;
    }

    @ApiOperation(value = "查询所有信息", notes = "查询数据库中某个学生的信息")
    @GetMapping(value = "/queryAll")
    public List<String> queryAll() {
        List<String> data = new ArrayList<>();
        data.add("java134");
        data.add("java资料社区");
        return data;
    }

    @ApiOperation(value = "获取redis中数据", notes = "通过key值获取")
    @ApiResponses({
            @ApiResponse(code = 400, message = "请求报文存在语法错误"),
            @ApiResponse(code = 401, message = "发送的请求需要有通过 HTTP 认证的认证信息"),
            @ApiResponse(code = 403, message = "请求资源的访问被服务器拒绝"),
            @ApiResponse(code = 404, message = "服务器上没有找到请求的资源")
    })
    @ApiImplicitParam(name = "key", value = "redis键值", required = true, dataType = "String")
    @PostMapping(value = "/getRedis")
    public String getRedis(String key) {
        Map<String, String> data = new HashMap<>();
        data.put("123", "Java资料社区");
        data.put("321", "Java");
        data.put("132", "小编");
        return data.get(key);
    }

    @ApiIgnore
    @RequestMapping("/index")
    public String index() {
        return "ApiIgnore=忽略这个接口";
    }
}

启动后在浏览器输入：IP:端口/swagger-ui.html