JSP和Servlet里的Cookie处理Cookie firstName = new Cookie("first_na

Cookie的设置方式

<%    
       
  Cookie firstName = new Cookie("first_name", request.getParameter("first_name"));    
  Cookie lastName = new Cookie("last_name",request.getParameter("last_name"));     
  // cookie expire: 24 hours    
  firstName.setMaxAge(60*60*24);     
  lastName.setMaxAge(60*60*24);      
   
  response.addCookie( firstName );    
  response.addCookie( lastName ); 
%>
<html>
<head>
<title>Setting Cookies</title>
</head>
<body>
<center>
<h1>Setting Cookies</h1>
</center>
<ul>
<li><p><b>First Name:</b>
<%= request.getParameter("first_name")%>
</p></li>
<li><p><b>Last  Name:</b>
   <%= request.getParameter("last_name")%>
</p></li>
</ul>
</body>
</html>

浏览器里打开该jsp：http://localhost:9032/jerryjsp/main.jsp?first_name=Jerry&last_name=Wang

可以在Chrome开发者工具Application标签页的Cookies区域查看到上述Java代码在响应结构里设置的Cookie.

Cookie的读取

新建一个jsp文件，源代码如下：

<html>
<head>
<title>Reading Cookies</title>
</head>
<body>
<center>
<h1>Reading Cookies</h1>
</center>
<%    
  Cookie cookie = null;    
  Cookie[] cookies = null;    
  
  cookies = request.getCookies();    
  if( cookies != null ){       
    out.println("<h2> Found Cookies Name and Value</h2>");
    for (int i = 0; i < cookies.length; i++){          
      cookie = cookies[i]; 
         
      out.print("Name : " + cookie.getName( ) + ",  ");          
      out.print("Value: " + cookie.getValue( )+" <br/>");
    }
  }else{
      out.println("<h2>No cookies founds</h2>");
  }
%>
</body>
</html>

浏览器打开，可以读取出之前设置的cookie：

这个服务器端读取到的Cookie是浏览器端发送给服务器并在服务器端解析的：

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