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| 24. 14. 3. 使用组件处理复选框 |
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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.
-->
<BODY bgcolor="white">
<FORM TYPE=POST ACTION=checkresult.jsp>
<BR>
<font size=5 color="red">
Check all Favorite fruits: <br>
<input TYPE=checkbox name=fruit VALUE=apples> Apples <BR>
<input TYPE=checkbox name=fruit VALUE=grapes> Grapes <BR>
<input TYPE=checkbox name=fruit VALUE=oranges> Oranges <BR>
<input TYPE=checkbox name=fruit VALUE=melons> Melons <BR>
<br> <INPUT TYPE=submit name=submit Value="Submit">
</font>
</FORM>
</BODY>
</HTML>
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checkresult.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.
-->
<body bgcolor="white">
<font size=5 color="red">
<%! String[] fruits; %>
<jsp:useBean id="foo" scope="page" class="beans.MyBean" />
<jsp:setProperty name="foo" property="fruit" param="fruit" />
<hr>
The checked fruits (got using request) are: <br>
<%
fruits = request.getParameterValues("fruit");
%>
<ul>
<%
if (fruits != null) {
for (int i = 0; i < fruits.length; i++) {
%>
<li>
<%
out.println (beans.HTMLFilter.filter(fruits[i]));
}
} else out.println ("none selected");
%>
</ul>
<br>
<hr>
The checked fruits (got using beans) are <br>
<%
fruits = foo.getFruit();
%>
<ul>
<%
if (!fruits[0].equals("1")) {
for (int i = 0; i < fruits.length; i++) {
%>
<li>
<%
out.println (beans.HTMLFilter.filter(fruits[i]));
}
} else out.println ("none selected");
%>
</ul>
</font>
</body>
</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 {
String b[] = new String[] { "1", "2", "3", "4" };
public String[] getFruit() {
return b;
}
public void setFruit(String [] b) {
this.b = b;
}
}
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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: JSPUseBeanToDealWithCheckBox.zip( 94 k) |
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