springMVC拦截器HandlerInterceptor用法代码示例

<!-- 注册拦截器 -->	<mvc:interceptors>		<bean class="com.project.base.interceptor.ControlInterceptor" />	</mvc:interceptors>

package com.iflashbuy.limanman;import java.util.Iterator;import java.util.Map;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;public class ControlInterceptor implements HandlerInterceptor{	private Logger logger = LoggerFactory.getLogger(getClass());	/**	 * 执行完控制器后调用，即离开时	 */	@Override		public void afterCompletion(HttpServletRequest request,				HttpServletResponse response, Object arg2, Exception arg3)						throws Exception {	}	@Override		public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)				throws Exception {		// TODO Auto-generated method stub	}	@Override		public Boolean preHandle(HttpServletRequest request, HttpServletResponse arg1, Object arg2) throws Exception {		int i = 1;		try {			@SuppressWarnings("unchecked")						Map<String, Object> parmMap = request.getParameterMap();			Iterator<String> iter = parmMap.keySet().iterator();			while (iter.hasNext()) {				Object key = iter.next();				Object value = parmMap.get(key);				logger.info("第" + i + "个param---->{}-{}", key, value);				i = i + 1;			}		}		catch (Exception e) {			i = 1;		}		i = 1;		return true;	}}

/**	 * 执行完控制器后调用，即离开时	 */@Override	public void afterCompletion(HttpServletRequest request,			HttpServletResponse response, Object arg2, Exception arg3)			throws Exception {	logger.info("className--->" + arg2);	logger.info("request--->" + request);}@Override	public void postHandle(HttpServletRequest request,			HttpServletResponse response, Object arg2, ModelAndView arg3)			throws Exception {}@Override	public Boolean preHandle(HttpServletRequest request,			HttpServletResponse response, Object arg2) throws Exception {	String sessionAuth = (String) request.getSession().getAttribute("auth");	if (sessionAuth != null) {		System.out.println("this is next step");		nextStep(request, response);	} else {		if (!checkHeaderAuth(request, response)) {			response.setStatus(401);			response.setHeader("Cache-Control", "no-store");			response.setDateHeader("Expires", 0);			response.setHeader("WWW-authenticate", "Basic Realm=/"请输入管理员账号密码/"");			return false;		}	}	return true;}private Boolean checkHeaderAuth(HttpServletRequest request,			HttpServletResponse response) throws IOException {	String auth = request.getHeader("Authorization");	System.out.println("auth encoded in base64 is " + getFromBASE64(auth));	if ((auth != null) && (auth.length() > 6)) {		auth = auth.substring(6, auth.length());		String decodedAuth = getFromBASE64(auth);		System.out.println("auth decoded from base64 is " + decodedAuth);		request.getSession().setAttribute("auth", decodedAuth);		return true;	} else {		return false;	}}private String getFromBASE64(String s) {	if (s == null)				return null;	try {		byte[] encodeBase64 = Base64.encodeBase64(s.getBytes("UTF-8"));		return new String(encodeBase64);	}	catch (UnsupportedEncodingException e) {		return null;	}}public void nextStep(HttpServletRequest request,			HttpServletResponse response) throws IOException {	System.out.println("you can go to the controller");}