Spring是一个很好很强大的开源框架,它就像是一个容器,为我们提供了各种Bean组件和服务。对于MVC这部分而言,它里面实现了从Url请求映射控制器方法的逻辑处理,在我们平时的开发工作中并不需要太多的理会这个Url是怎么和控制器中的方法建立映射的,一切都由Spring MVC帮我们搞定了。
但是我今天在做SDK工程的时候,突然产生一个想法:能否把我项目中的所有Url和Method的映射信息打印出来?以便我一眼就看出我已经完成了那些API接口开发,这些方法需要什么参数。就像下图所示:
有了想法就要用行动,第一步肯定是要去看看别人是否已经解决了这个问题啦。查了半天的资料,倒是发现有几个相似的问题,但都没有满意的答案,只好自己调试Spring,跟踪它的处理步骤,终于让我发现了一个可行的办法,不多说,直接贴代码:
1、首先建立一个类来保存我想要的东东
private class RequestToMethodItem { public String controllerName; public String methodName; public String requestType; public String requestUrl; public Class<?>[] methodParmaTypes; public RequestToMethodItem(String requestUrl, String requestType, String controllerName, String requestMethodName,Class<?>[] methodParmaTypes) { this.requestUrl = requestUrl; this.requestType = requestType; this.controllerName = controllerName; this.methodName = requestMethodName; this.methodParmaTypes = methodParmaTypes; } }2、然后就是收集信息创建对象啦
@RequestMapping(value = "/index", method = RequestMethod.GET) public ModelAndView index(HttpServletRequest request) { ServletContext servletContext = request.getSession().getServletContext(); if (servletContext == null) { return null; } WebApplicationContext appContext = WebApplicationContextUtils.getWebApplicationContext(servletContext); //请求url和处理方法的映射 List<RequestToMethodItem> requestToMethodItemList = new ArrayList<RequestToMethodItem>(); //获取所有的RequestMapping Map<String, HandlerMapping> allRequestMappings = BeanFactoryUtils.beansOfTypeIncludingAncestors(appContext,HandlerMapping.class, true, false); for (HandlerMapping handlerMapping : allRequestMappings.values()) { //本项目只需要RequestMappingHandlerMapping中的URL映射 if (handlerMapping instanceof RequestMappingHandlerMapping) { RequestMappingHandlerMapping requestMappingHandlerMapping = (RequestMappingHandlerMapping) handlerMapping; Map<RequestMappingInfo, HandlerMethod> handlerMethods = requestMappingHandlerMapping.getHandlerMethods(); for (Map.Entry<RequestMappingInfo, HandlerMethod> requestMappingInfoHandlerMethodEntry : handlerMethods.entrySet()) { RequestMappingInfo requestMappingInfo = requestMappingInfoHandlerMethodEntry.getKey(); HandlerMethod mappingInfoValue = requestMappingInfoHandlerMethodEntry.getValue(); RequestMethodsRequestCondition methodCondition = requestMappingInfo.getMethodsCondition(); String requestType = SetUtils.first(methodCondition.getMethods()).name(); PatternsRequestCondition patternsCondition = requestMappingInfo.getPatternsCondition(); String requestUrl = SetUtils.first(patternsCondition.getPatterns()); String controllerName = mappingInfoValue.getBeanType().toString(); String requestMethodName = mappingInfoValue.getMethod().getName(); Class<?>[] methodParamTypes = mappingInfoValue.getMethod().getParameterTypes(); RequestToMethodItem item = new RequestToMethodItem(requestUrl, requestType, controllerName, requestMethodName,methodParamTypes); requestToMethodItemList.add(item); } break; } } return new ModelAndView("index").addObject("MethodList", requestToMethodItemList); }这一步我需要说明一下,我这里只用了“RequestMappingHandlerMapping”中的映射信息,其实还有另外三个HandlerMapping,如果想要获取项目中所有的映射信息,肯定是一个都不能放过了。调试的 信息如下:
3、取到数据后就展示呗,借助Thymeleaf,很容易就实现了展示,效果就是第一张图。
<!DOCTYPE html> <html xmlns:th="http://www.thymeleaf.org"> <head> <title>Spring Thyme Seed Starter Manager</title> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/> <link rel="stylesheet" type="text/css" media="all" href="../../css/stsm.css" th:href="@{/css/stsm.css}"/> <title>请求方法列表</title> </head> <body> <div style="margin: 0;padding: 0;text-align: center"><h1>请求方法列表</h1></div> <div> <ul> <li th:each="method:${MethodList}"> <h3 th:text="${method.methodName}"></h3> <p th:text="'所属控制器:'+${method.controllerName}"></p> <p th:text="'请求URL:'+${method.requestUrl}"></p> <p th:text="'请求方式:'+${method.requestType}"></p> <div> <p>方法参数列表:</p> <ul> <li th:each="param:${method.methodParmaTypes}"> <p th:text="${param}"></p> </li> </ul> </div> </li> </ul> </div> </body> </html>
仅此而已