SpringMVC_拦截器.md

SpringMVC_拦截器

一、在spring_mvc.xml中添加配置

<mvc:interceptors>
    <bean class="com.edu.interceptor.ActionLogInterceptor"/>
</mvc:interceptors>

二、拦截器

package com.edu.interceptor;

import org.apache.log4j.Logger;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Map;

public class ActionLogInterceptor implements HandlerInterceptor {
    private Logger logger = Logger.getLogger(ActionLogInterceptor.class);

    private long startTime = 0;
    private String url = null;
    private String viewName = null;
    private Date date = null;
    private DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss S");
    @Override
    public boolean preHandle(HttpServletRequest request,
                             HttpServletResponse httpServletResponse,
                             Object handler) throws Exception {
        startTime = System.currentTimeMillis();
        date = new Date();

        url = request.getRequestURI();

        //如果访问静态资源，不打印：
        if (!url.contains("resources")) {
            logger.debug("--------------action请求-----------:"
                    + dateFormat.format(date));
            String str = "";
            if (handler != null) {
                System.out.println(handler);
                str = handler.toString().trim();
                //去掉修饰符和参数
                int index = str.indexOf(" ");
                if (index != -1) str = str.substring(index, str.length() - 1).trim();
                index = str.indexOf(" ");
                if (index != -1) str = str.substring(index + 1, str.length() - 1).trim();
                index = str.indexOf("(");
                if (index != -1) str = str.substring(0, index).trim();
            }
            logger.debug("url: " + url);
            logger.debug("method: " + request.getMethod());
            logger.debug("调用方法：" + str);
            logger.debug("参数：");
            Map parameterMap = request.getParameterMap();
            for (Object key : parameterMap.keySet()) {
                String name = (String) key;
                String value = request.getParameter(name);
                logger.debug(name + " : " + value);
            }
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest,
                           HttpServletResponse httpServletResponse,
                           Object o, ModelAndView modelAndView)
            throws Exception {
        if (modelAndView != null)
            viewName = modelAndView.getViewName();
    }

    @Override
    public void afterCompletion(HttpServletRequest request,
                                HttpServletResponse response,
                                Object handler, Exception e)
            throws Exception {
        if (!url.contains("resources")) {
            if (viewName != null) {
                logger.debug("viewName: " + viewName);
            }
            logger.debug("耗时：" + (System.currentTimeMillis() - startTime) + "毫秒");
            logger.debug("----------------------: " + dateFormat.format(new Date()));
        }
    }

}