springboot:interceptor

IncpConfig.java
增加拦截器config 继承WebMvcConfigurerAdapter
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package org.spring.springboot.configs;

import org.spring.springboot.interceptors.MyIncp1;
import org.spring.springboot.interceptors.MyIncp2;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
@Configuration
public class IncpConfig extends WebMvcConfigurerAdapter {

@Override
public void addInterceptors(InterceptorRegistry registry) {
// 多个拦截器组成一个拦截器链
// addPathPatterns 用于添加拦截规则
// excludePathPatterns 用户排除拦截
//<mvc:mapping path="/admin/**"/>
registry.addInterceptor(new MyIncp1()).addPathPatterns("/**");
registry.addInterceptor(new MyIncp2()).addPathPatterns("/**");
super.addInterceptors(registry);
}

}
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MyIncp1.java:拦截器实现
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public class MyIncp1 implements HandlerInterceptor{
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {
System.out.println(">>>MyInterceptor1>>>>>>>在请求处理之前进行调用（Controller方法调用之前）");

return true;// 只有返回true才会继续向下执行，返回false取消当前请求
}

@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
ModelAndView modelAndView) throws Exception {
System.out.println(">>>MyInterceptor1>>>>>>>请求处理之后进行调用，但是在视图被渲染之前（Controller方法调用之后）");
}

@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
throws Exception {
System.out.println(">>>MyInterceptor1>>>>>>>在整个请求结束之后被调用，也就是在DispatcherServlet 渲染了对应的视图之后执行（主要是用于进行资源清理工作）");
}
}