Cookies are some data that the server stores on the client, such as passwords and some data you have accessed.
Set Cookie
Copy codeThe Code is as follows:
// Set cookie
Cookie cookie = new Cookie ("TOM", "111 ");
// Set the validity period. The default unit is seconds.
Cookie. setMaxAge (7*24*60*60 );
// Add the cookie to the client
Response. addCookie (cookie );
Get Cookie
Copy codeThe Code is as follows:
<%
// Obtain the cookie
Cookie [] cookies = request. getCookies ();
If (cookies! = Null & cookies. length> 0 ){
For (int I = 0; I <cookies. length; I ++ ){
Out. print (cookies [I]. getName () + "----" + cookies [I]. getValue () + "<br/> ");
}
}
%>
Chinese support for cookies
Cookies do not support Chinese characters. If necessary, they must be transcoded and decoded.
Transcoding
Copy codeThe Code is as follows:
Strings [j] = java.net. URLEncoder. encode (list. get (I-1) [j], "UTF-8 ");
Decoding
Copy codeThe Code is as follows:
Out. print (java.net. URLDecoder. decode (cookies [I]. getValue (), "UTF-8") + "<br/> ");
Dynamically Delete the current Table row
Copy codeThe Code is as follows:
<Script language = "javascript">
Function deletegoods (obj ){
Var rowIndex = obj. parentNode. parentNode. rowIndex;
Var table = document. getElementById ("table ");
Table. deleteRow (rowIndex );
}
</Script>
Cookie to implement the shopping cart Function
Simulate the selection process with arrays, and put all the selection items into the Arraylist.
Copy codeThe Code is as follows:
<% @ Page import = "java. util. ArrayList" %>
<% @ Page language = "java" contentType = "text/html; charset = UTF-8"
PageEncoding = "UTF-8" import = "java. util. *" %>
<% @ Taglib uri = "http://java.sun.com/jsp/jstl/core" prefix = "c" %>
<! DOCTYPE html PUBLIC "-// W3C // dtd html 4.01 Transitional // EN" "http://www.w3.org/TR/html4/loose.dtd">
<Html>
<Head>
<Meta http-equiv = "Content-Type" content = "text/html; charset = UTF-8">
<Title> </title>
<Script language = "javascript">
Function deletegoods (obj ){
Var rowIndex = obj. parentNode. parentNode. rowIndex;
Var table = document. getElementById ("table ");
Table. deleteRow (rowIndex );
}
</Script>
</Head>
<Body>
<P>
<%
// Set cookie
ArrayList <String []> list = new ArrayList <String []> ();
List. add (new String [] {"1001", "img/1.jpg"," classic basic low-help canvas women's shoes 2.0 pink green "," # "," 39 "," ¥ 69. 00 "," 1 "});
List. add (new String [] {"1002", "img/2.jpg"," Basic rib Y-shaped camisole milk blue "," # "," m "," ¥ 9. 00 "," 1 "});
Int times = 1*24*60*60;
For (int I = 1; I <= list. size (); I ++ ){
String [] strings = new String [list. get (I-1). length];
For (int j = 0; j <list. get (I-1). length; j ++ ){
Strings [j] = java.net. URLEncoder. encode (list. get (I-1) [j], "UTF-8 ");
}
Cookie cookie = new Cookie ("item_id _" + I, strings [0]);
Cookie. setMaxAge (times );
Response. addCookie (cookie );
Cookie = new Cookie ("item_img _" + I, strings [1]);
Cookie. setMaxAge (times );
Response. addCookie (cookie );
Cookie = new Cookie ("item_title _" + I, strings [2]);
Cookie. setMaxAge (times );
Response. addCookie (cookie );
Cookie = new Cookie ("item_URL _" + I, strings [3]);
Cookie. setMaxAge (times );
Response. addCookie (cookie );
Cookie = new Cookie ("item_size _" + I, strings [4]);
Cookie. setMaxAge (times );
Response. addCookie (cookie );
Cookie = new Cookie ("item_price _" + I, strings [5]);
Cookie. setMaxAge (times );
Response. addCookie (cookie );
Cookie = new Cookie ("item_number _" + I, strings [6]);
Cookie. setMaxAge (times );
Response. addCookie (cookie );
}
%>
<%
// Obtain the cookie
Cookie [] cookies = request. getCookies ();
If (cookies! = Null & cookies. length> 0 ){
For (int I = 0; I <cookies. length; I ++ ){
Out. print (cookies [I]. getName () + "----" + java.net. URLDecoder. decode (cookies [I]. getValue (), "UTF-8") + "<br/> ");
}
}
If (cookies! = Null & cookies. length> 5 ){
ArrayList <String []> goodslist = new ArrayList <String []> ();
Int I = 1;
For (int j = 0; j <cookies. length/7; j ++ ){
String [] strings = new String [7];
For (int k = 0; k <strings. length; k ++ ){
Strings [k] = java.net. URLDecoder. decode (cookies [I ++]. getValue (), "UTF-8 ");
}
Goodslist. add (strings );
}
PageContext. setAttribute ("goodslist", goodslist );
}
// PageContext. setAttribute ("length", cookies. length );
%>
</P>
<Form name = "form1" method = "post" action = "">
<Table width = "700" border = "0" id = "table">
<Tr>
<Td> ID/image/product name </td>
<Td> SIZE </td>
<Td> unit price </td>
<Td> quantity </td>
<Td> </td>
</Tr>
<C: forEach items = "$ {goodslist}" var = "goods">
<Tr id = "$ {goods [0]}">
<Td >$ {goods [0]} </a> <a target = "_ blank"
Title = "$ {goods [2]}" href = "$ {goods [3]}" >$ {goods [2]} </a> </td>
<Td >$ {goods [4]} </td>
<Td >$ {goods [5]} </td>
<Td >$ {goods [6]} </td>
<Td> <a href = "#"> favorites </a> <a href = "#" onclick = "deletegoods (this) "> Delete </a> </td>
</Tr>
</C: forEach>
</Table>
</Form>
<P> </p>
</Body>
</Html>
Shopping Cart implementation result
The above section lists the obtained cookies.
The following section uses the Cookie layout to go to the shopping cart page.
Click Delete to delete the current row dynamically.
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