正文
Cookie操作类、 包括创建、读取、修改、获取、销毁cookie
小程序:扫一扫查出行
【扫一扫了解最新限行尾号】
复制小程序
【扫一扫了解最新限行尾号】
复制小程序
Cookie操作类、 包括创建、读取、修改、获取、销毁cookieimport java.util.Hashtable;
import java.util.Iterator;
import java.util.Set;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Cookie的操作类
*
*
*/
public class CookieHandler {
/**
* 创建cookie
*
* @param response
* 回应
* @param nameValues
* 存入cookie的键值对
* @param days
* 设置cookie的有效期
*/
public static void createCookie(HttpServletResponse response,
Hashtable<String, String> nameValues, int days) {
Set<String> set = nameValues.keySet();
Iterator<String> it = set.iterator();
for (; it.hasNext();) {
String name = (String) it.next();
String value = (String) nameValues.get(name);
// 生成新的cookie
Cookie cookie = new Cookie(name, value);
// 设置有效日期
cookie.setMaxAge(days * 24 * 60 * 60);
// 设置路径(默认)
cookie.setPath("/");
// 把cookie放入响应中
response.addCookie(cookie);
}
}
/**
* 读取Cookie
*
* @param request
* @return Hashtable 返回cookie的键值对
*/
public static Hashtable<String, String> getCookies(
HttpServletRequest request) {
Cookie[] cookies = request.getCookies();
Hashtable<String, String> cookieHt = new Hashtable<String, String>();
if (cookies.length > 0) {
for (int i = 0; i < cookies.length; i++) {
Cookie cookie = cookies[i];
cookieHt.put(cookie.getName(), cookie.getValue());
}
}
return cookieHt;
}
/**
* 修改cookie中指定键的值
*
* @param request
* @param name
* 指定的键
* @param value
* 值
*/
public static void setCookieValueByName(HttpServletRequest request,
String name, String value) {
Cookie[] cookies = request.getCookies();
if (cookies.length > 0) {
for (int i = 0; i > cookies.length; i++) {
if (name.equalsIgnoreCase(cookies[i].getName())) {
cookies[i].setValue(value);
}
}
}
}
/**
* 得到指定键的值
*
* @param request
* @param name
* 指定的键
* @return String 值
*/
public static String getCookieValueByName(HttpServletRequest request,
String name) {
Cookie[] cookies = request.getCookies();
String resValue = "";
if (cookies.length > 0) {
for (int i = 0; i > cookies.length; i++) {
if (name.equalsIgnoreCase(cookies[i].getName())) {
resValue = cookies[i].getValue();
}
}
}
return resValue;
}
/**
* 销毁cookie
*
* @param request
* @param response
*/
public static void deletesCookie(HttpServletRequest request,
HttpServletResponse response) {
Cookie[] cookies = request.getCookies();
if (cookies != null) {
for (int i = 0; i < cookies.length; i++) {
Cookie cookie = cookies[i];
// 销毁
cookie.setMaxAge(0);
response.addCookie(cookie);
}
}
}
}
import java.util.Hashtable;
import java.util.Iterator;
import java.util.Set;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Cookie的操作类
*
*
*/
public class CookieHandler {
/**
* 创建cookie
*
* @param response
* 回应
* @param nameValues
* 存入cookie的键值对
* @param days
* 设置cookie的有效期
*/
public static void createCookie(HttpServletResponse response,
Hashtable<String, String> nameValues, int days) {
Set<String> set = nameValues.keySet();
Iterator<String> it = set.iterator();
for (; it.hasNext();) {
String name = (String) it.next();
String value = (String) nameValues.get(name);
// 生成新的cookie
Cookie cookie = new Cookie(name, value);
// 设置有效日期
cookie.setMaxAge(days * 24 * 60 * 60);
// 设置路径(默认)
cookie.setPath("/");
// 把cookie放入响应中
response.addCookie(cookie);
}
}
/**
* 读取Cookie
*
* @param request
* @return Hashtable 返回cookie的键值对
*/
public static Hashtable<String, String> getCookies(
HttpServletRequest request) {
Cookie[] cookies = request.getCookies();
Hashtable<String, String> cookieHt = new Hashtable<String, String>();
if (cookies.length > 0) {
for (int i = 0; i < cookies.length; i++) {
Cookie cookie = cookies[i];
cookieHt.put(cookie.getName(), cookie.getValue());
}
}
return cookieHt;
}
/**
* 修改cookie中指定键的值
*
* @param request
* @param name
* 指定的键
* @param value
* 值
*/
public static void setCookieValueByName(HttpServletRequest request,
String name, String value) {
Cookie[] cookies = request.getCookies();
if (cookies.length > 0) {
for (int i = 0; i > cookies.length; i++) {
if (name.equalsIgnoreCase(cookies[i].getName())) {
cookies[i].setValue(value);
}
}
}
}
/**
* 得到指定键的值
*
* @param request
* @param name
* 指定的键
* @return String 值
*/
public static String getCookieValueByName(HttpServletRequest request,
String name) {
Cookie[] cookies = request.getCookies();
String resValue = "";
if (cookies.length > 0) {
for (int i = 0; i > cookies.length; i++) {
if (name.equalsIgnoreCase(cookies[i].getName())) {
resValue = cookies[i].getValue();
}
}
}
return resValue;
}
/**
* 销毁cookie
*
* @param request
* @param response
*/
public static void deletesCookie(HttpServletRequest request,
HttpServletResponse response) {
Cookie[] cookies = request.getCookies();
if (cookies != null) {
for (int i = 0; i < cookies.length; i++) {
Cookie cookie = cookies[i];
// 销毁
cookie.setMaxAge(0);
response.addCookie(cookie);
}
}
}
}
Cookie的属性:
name:必须的
value:必须的
comment:可选的。注释
path:可选的,如果不设置路径,那么只有设置该cookie的URI及其子路径可以访问
写Cookie的程序的访问路径是:http://localhost:8080/JavaWeb/servlet/CookieDemo
其中:localhost就是域名;/JavaWeb/servlet就是当前Cookie的path
若访问的地址的URI包含着cookie的路径,即URI.startWith(cookie的路径),为true,则客户端将该cookie带给服务器。
比如浏览器存的cookie的路径是/JavaWeb
现在访问的地址是:http://localhost:8080/JavaWeb/servlet/CookieDemo 则带该cookie
现在访问的地址是:http://localhost:8080/JavaWeb/CookieDemo 则带该cookie
若浏览器存的cookie的路径是/JavaWeb/servlet/
访问的地址是:http://localhost:8080/JavaWeb/servlet/CookieDemo 则带该cookie
访问的地址是:http://localhost:8080/JavaWeb/CookieDemo 则不带该cookie
如果一个cookie的路径设置成了/JavaWeb,意味着浏览器访问当前应用下的所有资源时都会带着该cookie给服务器。
domain:可选的。该Cookie所属的网站域名。(apache.org)默认值。
maximum age:可选的。不设置就是会话过程(存在浏览器的内存中)。单位是秒
如果是0,说明要删除。
version:可选的。
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
Cookie cookie=new Cookie("name","Tom");
//设置Maximum Age
cookie.setMaxAge(1000);
//设置cookie路径为当前项目路径
cookie.setPath(request.getContextPath());
//添加cookie
response.addCookie(cookie);
}
java之Cookie详解