spring mvc 动态添加 RequestMapping

spring mvc 动态添加 RequestMapping

spring mvc 动态添加 RequestMapping

想法总是非常独特，有时候我们想在运行期间动态添加接口，那么就用到了动态添加 RequestMapping了

首先我们得搞清楚 springmvc 请求原理，客户端发起请求，会先去 RequestMappingHandlerMapping 里面去查找，如果找不到，就 404 了。

明白了请求原理，那么动态添加就容易了。只需要往RequestMappingHandlerMapping里面添加一个请求映射就可以了。

AbstractHandlerMethodMapping 提供了 registerMapping 和 unregisterMapping 方法

继承关系：

RequestMappingHandlerMapping -> RequestMappingInfoHandlerMapping -> AbstractHandlerMethodMapping

具体代码：

@Autowired RequestMappingHandlerMapping requestMappingHandlerMapping; public ResultData hello(){ return ResultData.success("hello"); } @PostMapping("get") @ResponseBody public ResultData addRequestMapper() throws IllegalAccessException, InstantiationException { Class<?> entry = this.getClass(); // hello 是方法名，ReflectionUtils 是 org.springframework.util 包 Method methodName = ReflectionUtils.findMethod(entry, "hello"); PatternsRequestCondition patterns = new PatternsRequestCondition("op/api/test/hello"); RequestMethodsRequestCondition method = new RequestMethodsRequestCondition(RequestMethod.POST); RequestMappingInfo mappingInfo = new RequestMappingInfo(patterns, method, null, null, null, null, null); requestMappingHandlerMapping.registerMapping(mappingInfo, entry.newInstance(), methodName); return ResultData.success(); }