對Cookie的操作

Servlet端：

package com.Servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@SuppressWarnings("serial")
public class CookieServlet extends HttpServlet {
	
	String getCookie(Cookie[] cookies,String key){
		if(cookies!=null){
			for(Cookie cookie:cookies){
				if(cookie.getName().equals(key))
					return cookie.getValue();
			}
		}
		return null;
	}

	public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

		Cookie[] cookies=request.getCookies();
		String userName=getCookie(cookies,"userName");
		String userAge=getCookie(cookies, "userAge");
		if(userName==null){
			response.addCookie(new Cookie("userName", "Tom"));
		}
		if(userAge==null){
			response.addCookie(new Cookie("userAge", "11"));
		}
		response.getHeader("Set-Cookie");
		response.sendRedirect("Second.jsp");
	}

}

js寫入Cookie：

<script type="text/javascript">
	document.cookie = "userName=Tom11";
	document.cookie = "userAge=222";
</script>

js讀取Cookie：

<script type="text/javascript">
	readCookie("userName");
	
	function readCookie(name) {
		var cookieValue = "";
		var search = name + "=";
		if (document.cookie.length > 0) {
			offset = document.cookie.indexOf(search);
			if (offset != -1) {
				offset += search.length;
				end = document.cookie.indexOf(";", offset);
				if (end == -1)
					end = document.cookie.length;
				cookieValue = (document.cookie.substring(offset, end))
			}
		}
		alert(cookieValue);
	}
</script>

jsp端讀取Cookie：

<%
	for (Cookie cookie : request.getCookies()) {
		out.println(cookie.getValue());
	}
%>