更新时间:2023-05-16 来源:黑马程序员 浏览量:
Cookie不能存储中文,但是如果有这方面的需求,这个时候该如何解决呢?
这个时候,我们可以使用之前学过的一个知识点叫URL编码,所以如果需要存储中文,就需要进行转码,具体的实现思路为:
1.在AServlet中对中文进行URL编码,采用URLEncoder.encode(),将编码后的值存入Cookie中
2.在BServlet中获取Cookie中的值,获取的值为URL编码后的值
3.将获取的值在进行URL解码,采用URLDecoder.decode(),就可以获取到对应的中文值
(1)在AServlet中对中文进行URL编码
@WebServlet("/aServlet") public class AServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest request, HttpServletResponse sponse) throws ServletException, IOException { //发送Cookie String value = "张三"; //对中文进行URL编码 value = URLEncoder.encode(value, "UTF-8"); System.out.println("存储数据:" + value); //将编码后的值存入Cookie中 Cookie cookie = new Cookie("username", value); //设置存活时间 ,1周 7天 cookie.setMaxAge(60 * 60 * 24 * 7); //2. 发送Cookie,response response.addCookie(cookie); } @Override protected void doPost(HttpServletRequest request, HttpServletResponse ponse) throws ServletException, IOException { this.doGet(request, response); } }(2)在BServlet中获取值,并对值进行解码。
@WebServlet("/bServlet") public class BServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest request, HttpServletResponse sponse) throws ServletException, IOException { //获取Cookie //1. 获取Cookie数组 Cookie[] cookies = request.getCookies(); //2. 遍历数组 for (Cookie cookie : cookies) { //3. 获取数据 String name = cookie.getName(); if("username".equals(name)){ String value = cookie.getValue();//获取的是URL编码后的值 %BC%A0%E4%B8%89 //URL解码 value = URLDecoder.decode(value,"UTF-8"); System.out.println(name+":"+value);//value解码后为 张三 break; } } } @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doGet(request, response); } }至此,我们就可以将中文存入Cookie中进行使用。