SpringBoot之WEB（三）

• Interceptor
• 1 自定義Interceptor
• 2 註冊Interceptor
• 3 執行結果
• 4 原始碼下載

Interceptor

1 自定義Interceptor

使用 @Component 讓 Spring 管理其生命週期：

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("耗時:"+(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("耗時:"+(System.currentTimeMillis() - start));

        System.out.println(exception);
    }
}

2 註冊Interceptor

在上文建立的 InterceptorConfig類：

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 執行結果

觀察控制檯列印輸出，結果如下圖

4 原始碼下載

原始碼下載地址：https://download.csdn.net/download/huangjun0210/10774393