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Spring MVC 提供了AOP风格的拦截器, 拥有更加精细的拦截处理能力.
注册拦截器
- 创建项目
- 创建拦截器实现
HandlerInterceptor接口
/**
* 拦截器示列
*
* @Auther: MaWenyi
* @Date: 2019/6/25
* @Description: com.iscolt.interceptor.web
* @version: 1.0
*/
public class MyInterceptor implements HandlerInterceptor {
/**
* 此方法返回true才会执行
*
* @param request
* @param response
* @param handler
* @return
* @throws Exception
*/
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
System.out.println("preHandle : 抱歉, 我第一个执行");
return true;
}
/**
* 拦截链内, 所有拦截器返回成功时才被调用
*
* @param request
* @param response
* @param handler
* @param modelAndView
* @throws Exception
*/
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
System.out.println("postHandle : 你们都是好人, 我才执行给你们看");
}
/**
* preHandle 返回false 后, 后面的都不执行
*
* @param request
* @param response
* @param handler
* @param ex
* @throws Exception
*/
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
System.out.println("afterCompletion : 只有preHandle大人发话, 我才放行");
}
}
执行顺序 :
preHandle >> Controller >> postHandle >> afterCompletion
- 配置拦截器
/**
* 配置拦截器
*
* @Auther: MaWenyi
* @Date: 2019/6/25
* @Description: com.iscolt.interceptor.config
* @version: 1.0
*/
@Configuration
public class WebMvcConfig implements WebMvcConfigurer {
/**
* addPathPatterns 表示拦截路径
* excludePatterns 表示排除路径
*
* @param registry
*/
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(new MyInterceptor())
.addPathPatterns("/**")
.excludePathPatterns("/hello");
}
}
