05-SpringBoot之WEB(三)—— ——整合Interceptor

Interceptor

1 自定义Interceptor

使用 @Component 让 Spring 管理其生命周期：

import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Created by HuangJun
 * 10:43 2018/11/9
 */
@Component
public class MyInterceptor  implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        System.out.println("========preHandle=========");
        System.out.println(((HandlerMethod)handler).getBean().getClass().getName());
        System.out.println(((HandlerMethod)handler).getMethod().getName());

        request.setAttribute("startTime", System.currentTimeMillis());

        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView)
            throws Exception {

        System.out.println("========postHandle=========");
        Long start = (Long) request.getAttribute("startTime");
        System.out.println("耗时:"+(System.currentTimeMillis() - start));
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception exception)
            throws Exception {

        System.out.println("========afterCompletion=========");
        Long start = (Long) request.getAttribute("startTime");
        System.out.println("耗时:"+(System.currentTimeMillis() - start));

        System.out.println(exception);
    }
}

2 注册Interceptor

在上文创建的 InterceptorConfig类：

import com.springboot.web.interceptor.MyInterceptor;
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.WebMvcConfigurerAdapter;

/**
 * Created by HuangJun
 * 10:50 2018/11/9
 */
@Configuration
public class InterceptorConfig  extends WebMvcConfigurerAdapter {
    @Autowired
    private MyInterceptor myInterceptor;
    
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(myInterceptor);
    }
}

3 运行结果

观察控制台打印输出，结果如下图

4 源码下载

源码下载地址：https://download.csdn.net/download/huangjun0210/10774393