属性值必须是SwaggerConfig中的常量

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

@Configuration
@EnableSwagger2
public class SwaggerConfig {

    // 定义常量
    private static final String API_TITLE = "My API";
    private static final String API_DESCRIPTION = "This is a sample API";
    private static final String API_VERSION = "1.0.0";

    @Bean
    public Docket api() {
        return new Docket(DocumentationType.SWAGGER_2)
                .select()
                .apis(RequestHandlerSelectors.basePackage("com.example.demo"))
                .paths(PathSelectors.any())
                .build()
                .apiInfo(apiInfo());
    }

    private ApiInfo apiInfo() {
        return new ApiInfoBuilder()
                .title(API_TITLE)
                .description(API_DESCRIPTION)
                .version(API_VERSION)
                .build();
    }
}

// 错误的写法
.title("My API")

// 正确的写法
.title(API_TITLE)