通过cookie类实例化cookie对象，使用response.addCokie()写入cookie写入cookie示例代码如下：
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//获取用户输入表单
String name = request.getParameter("username");
String password = request.getParameter("password");
String sex = request.getParameter("sex");
String[] hobby = request.getParameterValues("ah");
String gw = request.getParameter("zw");
String memo = request.getParameter("bz");
Cookie c =new Cookie("username", name);
byte[] by = Base64.getEncoder().encode(password.getBytes());
Cookie p = new Cookie("passwd",new String(by));
p.setMaxAge(60*60);
c.setMaxAge(60*60);
response.addCookie(c);
response.addCookie(p);
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet Form</TITLE></HEAD>");
out.println(" <BODY>");
out.print(" This is ");
out.println(name);
out.println(password);
out.println(sex);
for(String x:hobby){
out.println(x);
}
out.println(gw);
out.println(memo);
out.println("set cookie");
out.println(" </BODY>");
out.println("</HTML>");
写入cookie
servlet读取cookie使用request.getCookies()读取cookie，该方法返回一些列表，需要使用循环遍历该对象。读取代码如下：
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
javax.servlet.http.Cookie[] cs = request.getCookies();
response.setContentType("text/html");
PrintWriter out = response.getWriter();
if(cs != null &&cs.length>0){
for(int i =0;i<cs.length;i++){
javax.servlet.http.Cookie c = cs[i];
out.println(c.getName()+":"+c.getValue());
}
}else{
out.println("no cookie");
}
}
servlet读取cookie
读取cookie
