Spring是一個(gè)很好很強(qiáng)大的開源框架,它就像是一個(gè)容器,為我們提供了各種Bean組件和服務(wù)。對(duì)于MVC這部分而言,它里面實(shí)現(xiàn)了從Url請(qǐng)求映射控制器方法的邏輯處理,在我們平時(shí)的開發(fā)工作中并不需要太多的理會(huì)這個(gè)Url是怎么和控制器中的方法建立映射的,一切都由Spring MVC幫我們搞定了。
但是我今天在做SDK工程的時(shí)候,突然產(chǎn)生一個(gè)想法:能否把我項(xiàng)目中的所有Url和Method的映射信息打印出來?以便我一眼就看出我已經(jīng)完成了那些API接口開發(fā),這些方法需要什么參數(shù)。就像下圖所示:
有了想法就要用行動(dòng),第一步肯定是要去看看別人是否已經(jīng)解決了這個(gè)問題啦。查了半天的資料,倒是發(fā)現(xiàn)有幾個(gè)相似的問題,但都沒有滿意的答案,只好自己調(diào)試Spring,跟蹤它的處理步驟,終于讓我發(fā)現(xiàn)了一個(gè)可行的辦法,不多說,直接貼代碼:
1、首先建立一個(gè)類來保存我想要的東東
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、然后就是收集信息創(chuàng)建對(duì)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); //請(qǐng)求url和處理方法的映射 List<RequestToMethodItem> requestToMethodItemList = new ArrayList<RequestToMethodItem>(); //獲取所有的RequestMapping Map<String, HandlerMapping> allRequestMappings = BeanFactoryUtils.beansOfTypeIncludingAncestors(appContext,HandlerMapping.class, true, false); for (HandlerMapping handlerMapping : allRequestMappings.values()) { //本項(xiàng)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); }這一步我需要說明一下,我這里只用了“RequestMappingHandlerMapping”中的映射信息,其實(shí)還有另外三個(gè)HandlerMapping,如果想要獲取項(xiàng)目中所有的映射信息,肯定是一個(gè)都不能放過了。調(diào)試的 信息如下:
3、取到數(shù)據(jù)后就展示唄,借助Thymeleaf,很容易就實(shí)現(xiàn)了展示,效果就是第一張圖。
<!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>請(qǐng)求方法列表</title></head><body><div style="margin: 0;padding: 0;text-align: center"><h1>請(qǐng)求方法列表</h1></div><div> <ul> <li th:each="method:${MethodList}"> <h3 th:text="${method.methodName}"></h3> <p th:text="'所屬控制器:'+${method.controllerName}"></p> <p th:text="'請(qǐng)求URL:'+${method.requestUrl}"></p> <p th:text="'請(qǐng)求方式:'+${method.requestType}"></p> <div> <p>方法參數(shù)列表:</p> <ul> <li th:each="param:${method.methodParmaTypes}"> <p th:text="${param}"></p> </li> </ul> </div> </li> </ul></div></body></html>
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