Spring拦截器

Spring的拦截器配置文件

<mvc:interceptors>
    <mvc:interceptor>
         <mvc:mapping path="/**" />
          <!-- 不需要拦截的路径-->
          <mvc:exclude-mapping path="/login"/>           
         <bean class="com.springmvc.controller.interceptor.LoginInterceptor" />
    </mvc:interceptor>
   <!-- 可以配置多个 -->
</mvc:interceptors>

LoginInterceptor.java

package com.springmvc.controller.interceptor;

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

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

public class LoginInterceptor extends HandlerInterceptorAdapter {
    
    private static final Logger logger = LoggerFactory.getLogger(LoginInterceptor.class);
    @Override
    public boolean preHandle(HttpServletRequest request,
            HttpServletResponse response, Object handler) throws Exception {
        long startTime = System.currentTimeMillis();
        logger.info("请求URL::" + request.getRequestURL().toString()
                + ":: Start Time=" + System.currentTimeMillis());
        request.setAttribute("startTime", startTime);
        //if returned false, we need to make sure 'response' is sent
        return true;
    }
 
    @Override
    public void postHandle(HttpServletRequest request,
            HttpServletResponse response, Object handler,
            ModelAndView modelAndView) throws Exception {
        System.out.println("请求URL::" + request.getRequestURL().toString()
                + " Sent to Handler :: Current Time=" + System.currentTimeMillis());
         //这里可以做业务操作如判断session中user，不存在做跳转。   
        //we can add attributes in the modelAndView and use that in the view page
    }
 
    @Override
    public void afterCompletion(HttpServletRequest request,
            HttpServletResponse response, Object handler, Exception ex)
            throws Exception {
        long startTime = (Long) request.getAttribute("startTime");
        logger.info("请求URL::" + request.getRequestURL().toString()
                + ":: End Time=" + System.currentTimeMillis());
        logger.info("请求URL::" + request.getRequestURL().toString()
                + ":: Time Taken=" + (System.currentTimeMillis() - startTime));
    }
 
}

UserController.java

package com.springmvc.controller;

import java.util.Date;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/")
public class UserController { 
	private static final Logger logger = LoggerFactory.getLogger(UserController.class);	 
	
	/**
	 * 测试拦截器	
	 * @param model
	 * @return
	 */
	 @RequestMapping(value = "/home", method = RequestMethod.GET)
	    public String home(Model model) {
		 	logger.info("Welcome home! ");
	        try {
	            Thread.sleep(1000);
	        } catch (InterruptedException e) {
	            e.printStackTrace();
	        }
	         
	        model.addAttribute("serverTime", new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()));
	        logger.info("Before returning view page");
	        return "home";
	    }

}

浏览器URL测试 ：http://localhost:8080/example/home