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后臺對應的是哪個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，當然這些打印日志信息肯能并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：注冊攔截器
<!-- 注冊攔截器 --> <mvc:interceptors> <bean class="com.project.base.interceptor.ControlInterceptor" /> </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()); /** * 執行完控制器后調用，即離開時 */ @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object arg2, Exception arg3) throws Exception { } @Override public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3) throws Exception { // TODO Auto-generated method stub } @Override public 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、后臺打印信息效果
三、拓展使用攔截器實現http基本認證
/** * 執行完控制器后調用，即離開時 */@Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object arg2, Exception arg3) throws Exception { logger.info("className--->" + arg2); logger.info("request--->" + request);}@Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object arg2, ModelAndView arg3) throws Exception {}@Override public 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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