模块功能

http://localhost:8080/car/get访问网页拦截器计算时间

结构

java.cn.tedu
    controller//包
        controller//类
        MyConfig//类
        MyInterlnterceptor//类
    RunApp
pom.xml

RunApp

package cn.tedu;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.stereotype.Controller;
@SpringBootApplication
@Controller
public class RunApp {
    public static void main(String[] args) {
        SpringApplication.run(RunApp.class);
    }
}

测试CarController

package cn.tedu.controller;
import cn.tedu.RunApp;
import org.springframework.boot.SpringApplication;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("/car")
public class CarController {
    @RequestMapping("/save")
    public  String save( ) {
        System.out.println("save方法");
        return "save方法";
    }
    @RequestMapping("/get")
    public String get() {
        for (int i = 0; i < 10; i++) {
            System.out.println("get执行中");
        }
        return "get方法";
    }
}

MyInterlnterceptor创建拦截器

package cn.tedu.controller;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.xml.ws.handler.Handler;
@Component
public class MyInterlnterceptor implements HandlerInterceptor {
    long start;
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        start= System.currentTimeMillis();
        return true;
    }
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        long end = System.currentTimeMillis();
        System.out.println("方法执行了"+(end-start)+"ms");
    }
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("资源释放完成");
    }
}

MyConfig注册拦截器

package cn.tedu.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
@Configuration//告诉spring容器,我是一个配置类
public class MyConfig implements WebMvcConfigurer {
    @Autowired//自动装配
    private MyInterlnterceptor my;
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
          //把自定义的拦截器,放入容器中
        registry.addInterceptor(my);
    }
}