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在 Spring Boot 2.7.6 版本中集成 Swagger 的步骤相对直接，主要涉及添加依赖、编写配置以及在控制器中添加文档注解几个环节。
下面是集成 Swagger 的基本步骤：
1. 添加依赖
首先，在pom.xml文件中添加 Swagger 相关依赖。
对于 Spring Boot 2.x 版本，推荐使用 springfox-boot-starter，这是一个包含 Swagger UI 和 Swagger 2 功能的启动器模块。
<dependencies><!-- Springfox Swagger UI and Swagger 2 support --><dependency><groupId>io.springfox</groupId><artifactId>springfox-boot-starter</artifactId><version>3.0.0</version> <!-- 确认最新的版本号 --></dependency><!-- 其他依赖... -->
</dependencies>2. 编写 Swagger 配置
创建一个配置类来设置 Swagger 的基本信息，比如 API 文档的基本信息、扫描的包路径等。
#swgger启用标识 true启用 false不启用
sys:swagger:enable-swgger: trueimport 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.EnableSwagger2WebMvc;@Configuration
@EnableSwagger2WebMvc // 如果使用的是Springfox 3.x，则启用此注解
public class SwaggerConfig {@Value("${sys.swagger.enable-swgger}")private Boolean enableSwgger;@Beanpublic Docket api() {return new Docket(DocumentationType.SWAGGER_2).enable(enableSwgger).select().apis(RequestHandlerSelectors.any()).paths(PathSelectors.any()).build().apiInfo(apiInfo());}private ApiInfo apiInfo() {return new ApiInfoBuilder().title("Your API Title").description("Description of your API").version("1.0.0").build();}
}3. 在控制器中使用注解
在REST 控制器类和方法上添加 Swagger 提供的注解，以便生成详细的文档信息。
@Api: 用于类级别，描述控制器的作用。
@ApiOperation: 用于方法级别，描述具体操作。
@ApiParam: 用于方法参数，描述参数详情。
@ApiResponse: 用于方法，描述响应详情。
@ApiModel 和 @ApiModelProperty: 用于模型对象，描述返回实体的属性。
例如：
@RestController
@RequestMapping("/api/users")
@Api(value = "User Management", description = "User CRUD operations")
public class UserController {@GetMapping("/{id}")@ApiOperation(value = "Find user by ID", notes = "Returns a single user")@ApiResponses({@ApiResponse(code = 200, message = "Successfully retrieved user"),@ApiResponse(code = 404, message = "User not found")})public ResponseEntity<User> getUser(@PathVariable Long id) {// ... implementation}// ... other methods
}4. 访问 Swagger UI
配置完成后，启动 Spring Boot 应用，然后访问 http://localhost:8080/doc.html（默认端口为8080，根据实际情况调整），应该能看到 Swagger UI 页面，其中列出了所有被扫描到的 API 接口及其详细信息。
5、问题记录
5.1、启动报错
报错信息如下：
org.springframework.context.ApplicationContextException: Failed to start bean 'documentationPluginsBootstrapper'; nested exception is java.lang.NullPointerExceptionat org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:181) ~[spring-context-5.3.24.jar:5.3.24]at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:54) ~[spring-context-5.3.24.jar:5.3.24]at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:356) ~[spring-context-5.3.24.jar:5.3.24]at java.lang.Iterable.forEach(Iterable.java:75) ~[na:1.8.0_77]at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:155) ~[spring-context-5.3.24.jar:5.3.24]at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:123) ~[spring-context-5.3.24.jar:5.3.24]at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:935) ~[spring-context-5.3.24.jar:5.3.24]at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:586) ~[spring-context-5.3.24.jar:5.3.24]at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:147) ~[spring-boot-2.7.6.jar:2.7.6]at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:731) [spring-boot-2.7.6.jar:2.7.6]at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:408) [spring-boot-2.7.6.jar:2.7.6]at org.springframework.boot.SpringApplication.run(SpringApplication.java:307) [spring-boot-2.7.6.jar:2.7.6]at org.springframework.boot.SpringApplication.run(SpringApplication.java:1303) [spring-boot-2.7.6.jar:2.7.6]at org.springframework.boot.SpringApplication.run(SpringApplication.java:1292) [spring-boot-2.7.6.jar:2.7.6]at com.zklcsoftware.FlowableUiApplication.main(FlowableUiApplication.java:15) [classes/:na]at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_77]at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_77]at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_77]at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_77]at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-2.7.6.jar:2.7.6]解决办法：
需要加上如下配置：
package com.zklcsoftware;import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.util.ReflectionUtils;
import org.springframework.web.servlet.mvc.method.RequestMappingInfoHandlerMapping;
import springfox.documentation.spring.web.plugins.WebFluxRequestHandlerProvider;
import springfox.documentation.spring.web.plugins.WebMvcRequestHandlerProvider;import java.lang.reflect.Field;
import java.util.List;
import java.util.stream.Collectors;@Configuration
public class BeanPostProcessorConfig {@Beanpublic static BeanPostProcessor springfoxHandlerProviderBeanPostProcessor() {return new BeanPostProcessor() {@Overridepublic Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {if (bean instanceof WebMvcRequestHandlerProvider || bean instanceof WebFluxRequestHandlerProvider) {customizeSpringfoxHandlerMappings(getHandlerMappings(bean));}return bean;}private <T extends RequestMappingInfoHandlerMapping> void customizeSpringfoxHandlerMappings(List<T> mappings) {List<T> copy = mappings.stream().filter(mapping -> mapping.getPatternParser() == null).collect(Collectors.toList());mappings.clear();mappings.addAll(copy);}@SuppressWarnings("unchecked")private List<RequestMappingInfoHandlerMapping> getHandlerMappings(Object bean) {try {Field field = ReflectionUtils.findField(bean.getClass(), "handlerMappings");field.setAccessible(true);return (List<RequestMappingInfoHandlerMapping>) field.get(bean);} catch (IllegalArgumentException | IllegalAccessException e) {throw new IllegalStateException(e);}}};}
}5.2、启动成功后，访问swagger-ui页面出现不显示接口信息的问题
解决办法：
在application.yml配置文件中加上下面的配置
spring:mvc:pathmatch:matching-strategy: ANT_PATH_MATCHER