Spring Boot编写拦截器教程实例解析

创建一个类并使其实现接口HandlerInterceptor

接口提供了一个请求的三个周期的拦截方法

在controller之前，返回true则放行，false反之,handler包含处理请求的controller类以及其方法

boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)在controller接受请求之后，contorller渲染视图之前，如果发生异常就不执行了,可对ModelAndView操作

void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView)在controller处理全部完成之后,ex参数包含处理期间发生的异常,但仅为未被全局捕获的异常

void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)

public class TheInterceptor implements HandlerInterceptor { @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { System.out.println('preHandle'); return true; } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { System.out.println('postHandle'); } @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { System.out.println('afterCompletion'); }}

编写完成后需要将其注册进处理栈中才会生效, 创建WebMvcConfigurer的实现类

@Configurationpublic class WebConfig implements WebMvcConfigurer { @Override public void addInterceptors(InterceptorRegistry registry) { registry.addInterceptor(new MyInterceptor())// 需要拦截的路径,默认全部拦截.addPathPatterns('/test1')// 需要排除的路径.excludePathPatterns('/test2'); }}

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