一、自定義過濾器
創(chuàng)建一個過濾器，實現(xiàn)javax.servlet.Filter接口，并重寫其中的init、doFilter、destory方法。
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package com.example.filter; import java.io.IOException; import javax.servlet.Filter; import javax.servlet.FilterChain; import javax.servlet.FilterConfig; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import javax.servlet.annotation.WebFilter; /** * 實現(xiàn)javax.servlet.Filter,覆蓋其三個方法 * @author Administrator * */@WebFilter(filterName="customFilter",urlPatterns="/*") public class CustomFilter implements Filter{ @Override public void destroy() { System.out.println("CustomFilter過濾器銷毀"); } @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { System.out.println("CustomFilter指定過濾器操作......"); //執(zhí)行操作后必須doFilter chain.doFilter(request, response); } @Override public void init(FilterConfig arg0) throws ServletException { System.out.println("CustomFilter初始化......"); } } |
二、自定義監(jiān)聽器
創(chuàng)建一個過濾器，實現(xiàn)ServletContextListener接口
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package com.example.listener; import javax.servlet.ServletContextEvent; import javax.servlet.ServletContextListener; import javax.servlet.annotation.WebListener; /** * 實現(xiàn)ServletContextListener，覆蓋其兩個方法 * @author Administrator * */@WebListenerpublic class CustomListener implements ServletContextListener{ @Override public void contextDestroyed(ServletContextEvent servletContext) { System.out.println("servletContext銷毀......"); } @Override public void contextInitialized(ServletContextEvent servletContext) { System.out.println("servletContext初始化......"); } } |
創(chuàng)建一個session監(jiān)聽器，監(jiān)聽session的創(chuàng)建和銷毀
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package com.example.listener; import javax.servlet.annotation.WebListener; import javax.servlet.http.HttpSessionEvent; import javax.servlet.http.HttpSessionListener; /** * 實現(xiàn)HttpSessionListener接口，監(jiān)視session的動態(tài) * @author Administrator * */@WebListenerpublic class SessionListener implements HttpSessionListener{ @Override public void sessionCreated(HttpSessionEvent session) { System.out.println("session創(chuàng)建成功......"); } @Override public void sessionDestroyed(HttpSessionEvent session) { System.out.println("session銷毀......"); } } |
三、自定義攔截器
步驟：
1、創(chuàng)建自己的攔截器實現(xiàn)HandlerInterceptor接口
2、創(chuàng)建自己的攔截器鏈，繼承WebMvcConfigurerAdapter類，重寫addInterceptors方法。
3、實例化自己的攔截器，并加入到攔截器鏈中。
攔截器一：
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package com.example.Interceptor; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.web.servlet.HandlerInterceptor; import org.springframework.web.servlet.ModelAndView; public class CustomInterceptor implements HandlerInterceptor { @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object object, Exception exception) throws Exception { //在整個請求結(jié)束之后被調(diào)用，也就是在DispatcherServlet 渲染了對應(yīng)的視圖之后執(zhí)行（主要是用于進(jìn)行資源清理工作） System.out.println("3. 整個請求結(jié)束之后被調(diào)用......CustomInterceptor1......"); } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object object, ModelAndView view) throws Exception { // 請求處理之后進(jìn)行調(diào)用，但是在視圖被渲染之前 System.out.println("2. 請求處理之后進(jìn)行調(diào)用，但是在視圖被渲染之前......CustomInterceptor1......"); } @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object object) throws Exception { // 在請求處理之前進(jìn)行調(diào)用 System.out.println("1. 在請求處理之前進(jìn)行調(diào)用......CustomInterceptor1......"); // 只有返回true才會繼續(xù)向下執(zhí)行，返回false取消當(dāng)前請求 return true; } } |
攔截器二：
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package com.example.Interceptor; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.web.servlet.HandlerInterceptor; import org.springframework.web.servlet.ModelAndView; public class CustomInterceptor2 implements HandlerInterceptor { @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object object, Exception exception) throws Exception { //在整個請求結(jié)束之后被調(diào)用，也就是在DispatcherServlet 渲染了對應(yīng)的視圖之后執(zhí)行（主要是用于進(jìn)行資源清理工作） System.out.println("3. 整個請求結(jié)束之后被調(diào)用......CustomInterceptor2......"); } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object object, ModelAndView view) throws Exception { // 請求處理之后進(jìn)行調(diào)用，但是在視圖被渲染之前 System.out.println("2. 請求處理之后進(jìn)行調(diào)用，但是在視圖被渲染之前......CustomInterceptor2......"); } @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object object) throws Exception { // 在請求處理之前進(jìn)行調(diào)用 System.out.println("1. 在請求處理之前進(jìn)行調(diào)用......CustomInterceptor2......"); // 只有返回true才會繼續(xù)向下執(zhí)行，返回false取消當(dāng)前請求 return true; } } |
自定義攔截器鏈并加入自定義的攔截器
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package com.example.adapter; import org.springframework.context.annotation.Configuration; import org.springframework.web.servlet.config.annotation.InterceptorRegistry; import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter; import com.example.Interceptor.CustomInterceptor; import com.example.Interceptor.CustomInterceptor2; /** * 繼承WebMvcConfigurerAdapter，復(fù)寫addInterceptors方法 * @author Administrator * */@Configurationpublic class WebAdapter extends WebMvcConfigurerAdapter{ @Override public void addInterceptors(InterceptorRegistry registry) { //眾多的攔截器組成了一個攔截器鏈 /** * 主要方法說明： * addPathPatterns 用于添加攔截規(guī)則 * excludePathPatterns 用戶排除攔截 */ registry.addInterceptor(new CustomInterceptor()).addPathPatterns("/*"); registry.addInterceptor(new CustomInterceptor2()).addPathPatterns("/*"); super.addInterceptors(registry); } } |
以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持服務(wù)器之家。
原文鏈接：http://blog.csdn.net/linabc123000/article/details/69245148
