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Spring MVC提供了拦截器方便在接口调用前后进行一些通用处理。
2.步骤
1.实现一个拦截器类#xff0c;共有三处拦截时机#xff1a;
public class Interceptor1 implements HandlerInterceptor {//实现HandlerInterceptor接口//执行handler之前调用//编码格式处理…1.简介
Spring MVC提供了拦截器方便在接口调用前后进行一些通用处理。
2.步骤
1.实现一个拦截器类共有三处拦截时机
public class Interceptor1 implements HandlerInterceptor {//实现HandlerInterceptor接口//执行handler之前调用//编码格式处理登录保护权限处理Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {System.out.println(Interceptor1.preHandle);return true;//拒绝还是通过}//handler执行完毕后执行//检查敏感词汇Overridepublic void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {System.out.println(Interceptor1.postHandle);HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);}//整体处理完毕执行Overridepublic void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {System.out.println(Interceptor1.afterCompletion);HandlerInterceptor.super.afterCompletion(request, response, handler, ex);}
}2.在配置类中注册拦截类
public class MvcConfig implements WebMvcConfigurer {//实现WebMvcConfigurer接口
...Overridepublic void addInterceptors(InterceptorRegistry registry){//方法 1.注册拦截类拦截全部请求registry.addInterceptor(new Interceptor1());//方法 2.指定地址拦截//通配符* 一层字符 **多层字符registry.addInterceptor(new Interceptor1()).addPathPatterns(/product/**);//方法 3.排除拦截registry.addInterceptor(new Interceptor1()).addPathPatterns(/user/***).excludePathPatterns(/user/data1);//如果有多个拦截类优先级如何registry.addInterceptor(new Interceptor1())//先声明优先级高先进后出.addPathPatterns(/product/**);registry.addInterceptor(new Interceptor2())//后声明优先级低后进先出.addPathPatterns(/product/**);
}
