[JavaWeb]Cookie显示用户上次访问时间报错（Cookie值中存在无效字符）

报错如下：

原因：tomcat版本较高，cookie中不允许空格的存在

String currentTime = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss").format(new Date());
将上一行写成如下形式，报错就能解决
String currentTime = new SimpleDateFormat("yyyy-MM-dd-hh:mm:ss").format(new Date());

完整代码如下： 

package cn.itcast.firstmyapp.servlet;

import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Iterator;

import javax.servlet.ServletException;
import javax.servlet.http.cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


public class LastAccessServlet extends HttpServlet{

	
	private static final long serialVersionUID = 1L;
	@Override
	public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		
		//设置响应的编码方式
		resp.setContentType("text/html;charset=utf-8");
		
		String lastAccessTime = null;
		//获取所有cookie，将cookie放在数组中
		cookie[] cookies = req.getcookies();
		//遍历寻找是否有叫“lastAccess”的cookie
		for(int i = 0; cookies != null && i < cookies.length; i++) {
			if("lastAccess".equals(cookies[i].getName())) {
				lastAccessTime = cookies[i].getValue();
				break;
			}
		}
		
		if (lastAccessTime == null) {
			resp.getWriter().print("您是首次访问本站");
			
		}else {
			
			resp.getWriter().print("您上次的访问时间是"+lastAccessTime);
		}
		
		//获取当前时间
		//获取时间为年月日的形式
		String currentTime = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss").format(new Date());
		//由于tomcat版本较高，cookie的name和value中都不允许有空格的存在，所以将上一行写成如下形式，报错就能解决
		//String currentTime = new SimpleDateFormat("yyyy-MM-dd-hh:mm:ss").format(new Date());
		
		//创建cookie对象
		cookie cookie = new cookie("lastAccess", currentTime);
		
		//获取时间为秒，创建cookie对象
		//cookie cookie = new cookie("lastAccess",System.currentTimeMillis()+"");
		
		
		//cookie.setMaxAge(60*60); //设置cookie的有效时间
		
		//返回给客户端cookie
		resp.addcookie(cookie);
		
		
	}
	@Override
	public void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		// TODO Auto-generated method stub
		this.doPost(req, resp);
	}

}