只攔截controller的請(qǐng)求, 基于aop，橫切。

Spring MVC的攔截器類似于Servlet開發(fā)中的過濾器Filter， 用于對(duì)處理器進(jìn)行預(yù)處理和后處理。
將攔截器按一定的順序聯(lián)結(jié)成一條鏈， 這條鏈稱為攔截器鏈（InterceptorChain）。 在訪問被攔截的方法或字段時(shí)，
攔截器鏈中的攔截器就會(huì)按其之前定義的順序被調(diào)用。 攔截器也是AOP思想的具體實(shí)現(xiàn)。

configure xml

<!-- 攔截器 --><mvc:interceptors><bean class="cn.bitqian.interceptor.BaseInterceptor"></bean><!-- 用戶攔截器 --><mvc:interceptor> <!-- 攔截/user的請(qǐng)求 --> <mvc:mapping path="/user/**"/><mvc:exclude-mapping path="/user/login"/> <!-- 對(duì)應(yīng)實(shí)現(xiàn)的攔截器 --> <bean class="cn.bitqian.interceptor.UserInterceptor"></bean></mvc:interceptor><!-- 還可以配置多個(gè).. --></mvc:interceptors>

對(duì)登錄攔截

package cn.bitqian.interceptor;import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;import org.springframework.web.servlet.ModelAndView; import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;/*** 用戶攔截器* @author echo lovely**/ public class UserInterceptor extends HandlerInterceptorAdapter {@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)throws Exception {System.out.println("用戶攔截器...");Object user = request.getSession().getAttribute("user");if (user == null) {response.sendRedirect("redirect:/login.jsp");return false;}return true;}@Overridepublic void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,ModelAndView modelAndView) throws Exception {}@Overridepublic void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)throws Exception {}}

全局?jǐn)r截器，對(duì)性能分析

package cn.bitqian.interceptor;import java.util.LinkedHashMap; import java.util.Map;import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;import org.springframework.web.servlet.ModelAndView; import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;/*** 全局?jǐn)r截器* 1. 性能監(jiān)控* 2. 權(quán)限控制* 3. 日志記錄* @author echo lovely**/ public class BaseInterceptor extends HandlerInterceptorAdapter {// 性能監(jiān)控Map<String, Long> performanceMonitorMap = new LinkedHashMap<>();// 進(jìn)入方法前@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)throws Exception {String sessionId = request.getSession().getId();long threadId = Thread.currentThread().getId();performanceMonitorMap.put(sessionId + threadId, System.currentTimeMillis());System.out.println("全局?jǐn)r截器...");return true;}// 執(zhí)行完方法，視圖返回前@Overridepublic void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,ModelAndView modelAndView) throws Exception {}// controller執(zhí)行完，并且視圖已經(jīng)返回@Overridepublic void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)throws Exception {String sessionId = request.getSession().getId();long threadId = Thread.currentThread().getId();Long start = performanceMonitorMap.get(sessionId + threadId);Long end = System.currentTimeMillis();System.out.println("該方法執(zhí)行的時(shí)間：" + (end - start) * 1.0 / 1000 + "s");} }

總結(jié)

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