摘要:很多時候我們都會去修改其他同事的bug，甚至是已經離職的同事的bug，有時候我們點擊頁面去不著到後台對應的是哪個controller，針對這個問題，其實我們可以通過sprngmvc的攔截器來攔擊用戶的請求從而知道頁面請求的是哪個class的哪個方法，當然這些打印日誌信息肯能並不適合放在生產環境，或者這個攔截器也是非必要的。 。 。 。
一、HandlerInterceptor用法
第一步：註冊攔截器
<!-- 註冊攔截器--><mvc:interceptors><bean /></mvc:interceptors>
第二步：繼承HandlerInterceptor ，實現攔截器
package com.iflashbuy.limanman;import java.util.Iterator;import java.util.Map;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;public class ControlInterceptor implements HandlerInterceptor{private Logger logger = LoggerFactory.getLogger(getClass());/** * 執行完控制器後調用，即離開時*/@Overridepublic void afterCompletion(HttpServletRequest request,HttpServletResponse response, Object arg2, Exception arg3)throws Exception {}@Overridepublic void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)throws Exception {// TODO Auto-generated method stub}@Overridepublic Boolean preHandle(HttpServletRequest request, HttpServletResponse arg1, Object arg2) throws Exception {int i = 1;try {@SuppressWarnings("unchecked")Map<String, Object> parmMap = request.getParameterMap();Iterator<String> iter = parmMap.keySet().iterator();while (iter.hasNext()) {Object key = iter.next();Object value = parmMap.get(key);logger.info("第" + i + "個param---->{}-{}", key, value);i = i + 1;}}catch (Exception e) {i = 1;}i = 1;return true;}}二、後台打印信息效果
三、拓展使用攔截器實現http基本認證
/** * 執行完控制器後調用，即離開時*/@Overridepublic void afterCompletion(HttpServletRequest request,HttpServletResponse response, Object arg2, Exception arg3)throws Exception {logger.info("className--->" + arg2);logger.info("request--->" + request);}@Overridepublic void postHandle(HttpServletRequest request,HttpServletResponse response, Object arg2, ModelAndView arg3)throws Exception {}@Overridepublic Boolean preHandle(HttpServletRequest request,HttpServletResponse response, Object arg2) throws Exception {String sessionAuth = (String) request.getSession().getAttribute("auth");if (sessionAuth != null) {System.out.println("this is next step");nextStep(request, response);} else {if (!checkHeaderAuth(request, response)) {response.setStatus(401);response.setHeader("Cache-Control", "no-store");response.setDateHeader("Expires", 0);response.setHeader("WWW-authenticate", "Basic Realm=/"請輸入管理員賬號密碼/"");return false;}}return true;}private Boolean checkHeaderAuth(HttpServletRequest request,HttpServletResponse response) throws IOException {String auth = request.getHeader("Authorization");System.out.println("auth encoded in base64 is " + getFromBASE64(auth));if ((auth != null) && (auth.length() > 6)) {auth = auth.substring(6, auth.length());String decodedAuth = getFromBASE64(auth);System.out.println("auth decoded from base64 is " + decodedAuth);request.getSession().setAttribute("auth", decodedAuth);return true;} else {return false;}}private String getFromBASE64(String s) {if (s == null)return null;try {byte[] encodeBase64 = Base64.encodeBase64(s.getBytes("UTF-8"));return new String(encodeBase64);}catch (UnsupportedEncodingException e) {return null;}}public void nextStep(HttpServletRequest request,HttpServletResponse response) throws IOException {System.out.println("you can go to the controller");}總結
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Spring攔截器HandlerInterceptor接口代碼解析
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