<parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.2.1.RELEASE</version><relativePath/> <!-- lookup parent from repository -->
</parent><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><java.version>1.8</java.version>
</properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency>
</dependencies><build><pluginManagement><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></pluginManagement>
</build>
<repositories><repository><id>spring-snapshots</id><name>Spring Snapshots</name><url>https://repo.spring.io/libs-snapshot-local</url><snapshots><enabled>true</enabled></snapshots></repository><repository><id>spring-milestones</id><name>Spring Milestones</name><url>https://repo.spring.io/libs-milestone-local</url><snapshots><enabled>false</enabled></snapshots></repository><repository><id>spring-releases</id><name>Spring Releases</name><url>https://repo.spring.io/libs-release-local</url><snapshots><enabled>false</enabled></snapshots></repository>
</repositories>

public interface RequestCondition<T> {// 一个http接口上有多个条件规则时，用于合并T combine(T other);// 这个是重点，用于判断当前匹配条件和请求是否匹配；如果不匹配返回null// 如果匹配，生成一个新的请求匹配条件，该新的请求匹配条件是当前请求匹配条件针对指定请求request的剪裁// 举个例子来讲，如果当前请求匹配条件是一个路径匹配条件，包含多个路径匹配模板，// 并且其中有些模板和指定请求request匹配，那么返回的新建的请求匹配条件将仅仅// 包含和指定请求request匹配的那些路径模板。@NullableT getMatchingCondition(HttpServletRequest request);// 针对指定的请求对象request发现有多个满足条件的，用来排序指定优先级，使用最优的进行响应int compareTo(T other, HttpServletRequest request);}

public enum PlatformEnum {PC("pc", 1), APP("app", 1), WAP("wap", 1), ALL("all", 0);@Getterprivate String name;@Getterprivate int order;PlatformEnum(String name, int order) {this.name = name;this.order = order;}public static PlatformEnum nameOf(String name) {if (name == null) {return ALL;}name = name.toLowerCase().trim();for (PlatformEnum sub : values()) {if (sub.name.equals(name)) {return sub;}}return ALL;}
}

@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE, ElementType.METHOD})
public @interface Platform {PlatformEnum value() default PlatformEnum.ALL;
}

public class PlatformRequestCondition implements RequestCondition<PlatformRequestCondition> {@Getter@Setterprivate PlatformEnum platform;public PlatformRequestCondition(PlatformEnum platform) {this.platform = platform;}@Overridepublic PlatformRequestCondition combine(PlatformRequestCondition other) {return new PlatformRequestCondition(other.platform);}@Overridepublic PlatformRequestCondition getMatchingCondition(HttpServletRequest request) {PlatformEnum platform = this.getPlatform(request);if (this.platform.equals(platform)) {return this;}return null;}/*** 优先级** @param other* @param request* @return*/@Overridepublic int compareTo(PlatformRequestCondition other, HttpServletRequest request) {int thisOrder = this.platform.getOrder();int otherOrder = other.platform.getOrder();return otherOrder - thisOrder;}private PlatformEnum getPlatform(HttpServletRequest request) {String platform = request.getHeader("x-platform");return PlatformEnum.nameOf(platform);}
}

public class PlatformHandlerMapping extends RequestMappingHandlerMapping {@Overrideprotected RequestCondition<?> getCustomTypeCondition(Class<?> handlerType) {return buildFrom(AnnotationUtils.findAnnotation(handlerType, Platform.class));}@Overrideprotected RequestCondition<?> getCustomMethodCondition(Method method) {return buildFrom(AnnotationUtils.findAnnotation(method, Platform.class));}private PlatformRequestCondition buildFrom(Platform platform) {return platform == null ? null : new PlatformRequestCondition(platform.value());}
}

@Configuration
public class Config extends WebMvcConfigurationSupport {@Overridepublic RequestMappingHandlerMapping requestMappingHandlerMapping(@Qualifier("mvcContentNegotiationManager") ContentNegotiationManager contentNegotiationManager,@Qualifier("mvcConversionService") FormattingConversionService conversionService,@Qualifier("mvcResourceUrlProvider") ResourceUrlProvider resourceUrlProvider) {PlatformHandlerMapping handlerMapping = new PlatformHandlerMapping();handlerMapping.setOrder(0);handlerMapping.setInterceptors(getInterceptors(conversionService, resourceUrlProvider));return handlerMapping;}
}

@RestController
@RequestMapping(path = "method")
public class DemoMethodRest {@Platform@GetMapping(path = "index")public String allIndex() {return "default index";}@Platform(PlatformEnum.PC)@GetMapping(path = "index")public String pcIndex() {return "pc index";}@Platform(PlatformEnum.APP)@GetMapping(path = "index")public String appIndex() {return "app index";}@Platform(PlatformEnum.WAP)@GetMapping(path = "index")public String wapIndex() {return "wap index";}
}

@GetMapping(path = "hello")
public String hello() {return "hello";
}