SpringBoot API版本控制

落日映苍穹つ 2022-10-24 01:36 224阅读 0赞

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后端开发人员经常遇到接口升级、优化接口甚至重新定义一模一样新接口而且还得兼容旧版本接口。这样我们得维护两个一模一样接口，版本管理越来越重要。基于自定义注解获得请求头Header中apiVersion参数，版本大的转发不同接口上。

RequestMappingHandlerMapping请求详情  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2gyNzM5Nzk1ODY_size_16_color_FFFFFF_t_70]

*  **自定义版本注解**

/** * @Author: LailaiMonkey * @Description： * @Date：Created in 2020-10-14 17:47 * @Modified By： */
    @Target(ElementType.METHOD)
    @Retention(RetentionPolicy.RUNTIME)
    @Documented
    public @interface ApiVersion { 
    
        /** * 版本号 * @return */
        int value();
    }

*  **重写RequestCondition，自定义url匹配逻辑**

/** * @Author: LailaiMonkey * @Description： * @Date：Created in 2020-10-14 16:59 * @Modified By： */
    public class ApiVersionCondition implements RequestCondition<ApiVersionCondition> { 
    
        /** * 版本 */
        private int apiVersion;
    
        ApiVersionCondition(int apiVersion) { 
            this.apiVersion = apiVersion;
        }
    
        /** * 最近优先原则，方法定义的 @ApiVersion > 请求头定义apiVersion * * @param apiVersionCondition * @return */
        @Override
        public ApiVersionCondition combine(ApiVersionCondition apiVersionCondition) { 
            return new ApiVersionCondition(apiVersion);
        }
    
        /** * 获得符合匹配条件的ApiVersionCondition * * @param httpServletRequest * @return */
        @Override
        public ApiVersionCondition getMatchingCondition(HttpServletRequest httpServletRequest) { 
            //获得header传递的版本号
            String apiVersion = httpServletRequest.getHeader("apiVersion");
            if (StringUtils.isNotBlank(apiVersion)) { 
                try { 
                    Integer version = Integer.valueOf(apiVersion);
                    if (version >= this.apiVersion) { 
                        return this;
                    }
                } catch (Exception e) { 
                    System.out.println("版本号不合法：{}" + apiVersion);
                }
            }
            return null;
        }
    
        /** * 优先匹配最大版本号 * * @param apiVersionCondition * @param httpServletRequest * @return */
        @Override
        public int compareTo(ApiVersionCondition apiVersionCondition, HttpServletRequest httpServletRequest) { 
            return apiVersionCondition.getApiVersion() - this.apiVersion;
        }
    
        private int getApiVersion() { 
            return apiVersion;
        }
    }

*  **重写RequestMappingHandlerMapping，自定义匹配的处理器**

/** * @Author: LailaiMonkey * @Description： * @Date：Created in 2020-10-15 09:54 * @Modified By： */
    public class ApiVersioningRequestMappingHandlerMapping extends RequestMappingHandlerMapping { 
    
        @Override
        protected RequestCondition<ApiVersionCondition> getCustomTypeCondition(Class<?> handlerType) { 
            ApiVersion apiVersion = AnnotationUtils.findAnnotation(handlerType, ApiVersion.class);
            return createCondition(apiVersion);
        }
    
        @Override
        protected RequestCondition<ApiVersionCondition> getCustomMethodCondition(Method method) { 
            ApiVersion apiVersion = AnnotationUtils.findAnnotation(method, ApiVersion.class);
            return createCondition(apiVersion);
        }
    
        private RequestCondition<ApiVersionCondition> createCondition(ApiVersion apiVersion) { 
            return apiVersion == null ? null : new ApiVersionCondition(apiVersion.value());
        }
    }

*  **配置注册自定义WebMvcRegistrations**

/** * @Author: LailaiMonkey * @Description： * @Date：Created in 2020-10-15 09:57 * @Modified By： */
    @Configuration
    public class WebMvcRegistrationsConfig implements WebMvcRegistrations { 
    
        @Override
        public RequestMappingHandlerMapping getRequestMappingHandlerMapping() { 
            return new ApiVersioningRequestMappingHandlerMapping();
        }
    }

*  **测试Controller**

@ApiVersion(1)
        @GetMapping("/version")
        public Object version()  { 
            return "version";
        }
    
        @ApiVersion(3)
        @GetMapping("/version")
        public Object version1()  { 
            return "version1";
        }

访问[localhost:8080/version][localhost_8080_version]且header中apiVersion为1或2走第一个接口，apiVersion大于等于3走第二个接口

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2gyNzM5Nzk1ODY_size_16_color_FFFFFF_t_70]: /images/20221024/8f370198aa544cbdbe090755a1ef8642.png
[localhost_8080_version]: http://localhost:8080/version