jsp代码实例第270课

code270.java

package pack07;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

//ReadCookie
@WebServlet(name = "code270",urlPatterns = "/page10/pack07.code270")
public class code270 extends HttpServlet
{
  @Override
  protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
  {
    response.setContentType("text/html;charset=utf-8");
    PrintWriter out = response.getWriter();
    Cookie cookie1 = getCookieValue(request.getCookies(),"temp");
    if (cookie1 != null)
    {
      out.println("临时cookie值：" + cookie1.getValue()+"<br>");
    }
    else 
    {
      out.println("临时cookie未设置！ <br>");
    }

    Cookie cookie2 = getCookieValue(request.getCookies(), "cookie");
    if (cookie2 != null)
    {
      out.println("cookie的值：" + cookie2.getValue() + "<br>");
    }
    else 
    {
      out.println("cookie已被删除<br>");
    }

    Cookie cookie3 = getCookieValue(request.getCookies(), "user");
    if (cookie3 != null)
    {
      out.println("user:" + cookie3.getValue() + "<br>");
    }
    else 
    {
      out.println("user未设置！");
    }
  }

  protected Cookie getCookieValue(Cookie[] cookies,String name)
  {
    if (cookies != null)
    {
      for (Cookie c : cookies)
      {
        if (c.getName().equals(name))
        {
          return c;
        }
      }
    }
    return null;
  }
}