获取Cookie中的数据

浏览器每次请求时都会把与当前访问的域名相关的Cookie在请求中提交到服务端。通HttpServletRequest对象获取Cookie，返回Cookie数组。
Cookie[] cookies = request.getCookies()

import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
public class GetCookieDataServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doPost(req, resp);
    }
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //获取cookie对象
        Cookie[] cookies = req.getCookies();
        //获取cookie中的数据
        PrintWriter printWriter = resp.getWriter();
        for(int i = 0;i<cookies.length;i++){
            Cookie cookie = cookies[i];
            String name = cookie.getName();
            String value = cookie.getValue();
            printWriter.println(name+" "+value);
        }
        printWriter.flush();
        printWriter.close();
    }
}