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| 23. 57. 1. JSP的虚拟购物车 |
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index.jsp |
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<html>
<!--
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<head>
<title>carts</title>
</head>
<body bgcolor="white">
<font size = 5 color="#CC0000">
<form type=POST action=carts.jsp>
<BR>
Please enter item to add or remove:
<br>
Add Item:
<SELECT NAME="item">
<OPTION>Beavis & Butt-head Video collection
<OPTION>X-files movie
<OPTION>Twin peaks tapes
<OPTION>NIN CD
<OPTION>JSP Book
<OPTION>Concert tickets
<OPTION>Love life
<OPTION>Switch blade
<OPTION>Rex, Rugs & Rock n' Roll
</SELECT>
<br> <br>
<INPUT TYPE=submit name="submit" value="add">
<INPUT TYPE=submit name="submit" value="remove">
</form>
</FONT>
</body>
</html>
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carts.jsp |
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<html>
<!--
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<jsp:useBean id="cart" scope="session" class="beans.MyBean" />
<jsp:setProperty name="cart" property="*" />
<%
cart.processRequest(request);
%>
<FONT size = 5 COLOR="#CC0000">
<br> You have the following items in your cart:
<ol>
<%
String[] items = cart.getItems();
for (int i=0; i<items.length; i++) {
%>
<li> <% out.print(beans.HTMLFilter.filter(items[i])); %>
<%
}
%>
</ol>
</FONT>
</html>
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MyBean.java |
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package beans;
import java.beans.*;
import javax.servlet.http.*;
import javax.servlet.*;
import java.text.DateFormat;
import java.util.*;
public class MyBean {
Vector v = new Vector();
String submit = null;
String item = null;
private void addItem(String name) {
v.addElement(name);
}
private void removeItem(String name) {
v.removeElement(name);
}
public void setItem(String name) {
item = name;
}
public void setSubmit(String s) {
submit = s;
}
public String[] getItems() {
String[] s = new String[v.size()];
v.copyInto(s);
return s;
}
public void processRequest(HttpServletRequest request) {
// null value for submit - user hit enter instead of clicking on
// "add" or "remove"
if (submit == null)
addItem(item);
if (submit.equals("add"))
addItem(item);
else if (submit.equals("remove"))
removeItem(item);
// reset at the end of the request
reset();
}
// reset
private void reset() {
submit = null;
item = null;
}
}
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HTMLFilter.java |
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package beans;
/**
* HTML filter utility.
*
* @author Craig R. McClanahan
* @author Tim Tye
* @version $Revision: 466607 $ $Date: 2006-10-21 17:09:50 -0600 (Sat, 21 Oct 2006) $
*/
public final class HTMLFilter {
/**
* Filter the specified message string for characters that are sensitive
* in HTML. This avoids potential attacks caused by including JavaScript
* codes in the request URL that is often reported in error messages.
*
* @param message The message string to be filtered
*/
public static String filter(String message) {
if (message == null)
return (null);
char content[] = new char[message.length()];
message.getChars(0, message.length(), content, 0);
StringBuffer result = new StringBuffer(content.length + 50);
for (int i = 0; i < content.length; i++) {
switch (content[i]) {
case '<':
result.append("<");
break;
case '>':
result.append(">");
break;
case '&':
result.append("&");
break;
case '"':
result.append(""");
break;
default:
result.append(content[i]);
}
}
return (result.toString());
}
}
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 Download: JSPDummyCart.zip( 94 k) |
| 23. 57. 购物车 | | 23. 57. 1. | JSP的虚拟购物车 | | |
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