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2010-06-01T05:07:10Z
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http://www.jexp.ru/index.php?title=Java_Tutorial/JSP/JSP_2.0&diff=4969&oldid=prev
в 17:44, 31 мая 2010
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<p><b>Новая страница</b></p><div>== JSP 2.0 Expression Language - Basic Arithmetic ==<br />
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<!-- start source code --><br />
<br />
<source lang="java"><br />
<!--<br />
Licensed to the Apache Software Foundation (ASF) under one or more<br />
contributor license agreements. See the NOTICE file distributed with<br />
this work for additional information regarding copyright ownership.<br />
The ASF licenses this file to You under the Apache License, Version 2.0<br />
(the "License"); you may not use this file except in compliance with<br />
the License. You may obtain a copy of the License at<br />
http://www.apache.org/licenses/LICENSE-2.0<br />
Unless required by applicable law or agreed to in writing, software<br />
distributed under the License is distributed on an "AS IS" BASIS,<br />
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<br />
See the License for the specific language governing permissions and<br />
limitations under the License.<br />
--><br />
<html><br />
<head><br />
<title>JSP 2.0 Expression Language - Basic Arithmetic</title><br />
</head><br />
<body><br />
<h1>JSP 2.0 Expression Language - Basic Arithmetic</h1><br />
<hr><br />
This example illustrates basic Expression Language arithmetic.<br />
Addition (+), subtraction (-), multiplication (*), division (/ or div), <br />
and modulus (% or mod) are all supported. Error conditions, like<br />
division by zero, are handled gracefully.<br />
<br><br />
<blockquote><br />
<code><br />
<table border="1"><br />
<thead><br />
<td><b>EL Expression</b></td><br />
<td><b>Result</b></td><br />
</thead><br />
<tr><br />
<td>\${1}</td><br />
<td>${1}</td><br />
</tr><br />
<tr><br />
<td>\${1 + 2}</td><br />
<td>${1 + 2}</td><br />
</tr><br />
<tr><br />
<td>\${1.2 + 2.3}</td><br />
<td>${1.2 + 2.3}</td><br />
</tr><br />
<tr><br />
<td>\${1.2E4 + 1.4}</td><br />
<td>${1.2E4 + 1.4}</td><br />
</tr><br />
<tr><br />
<td>\${-4 - 2}</td><br />
<td>${-4 - 2}</td><br />
</tr><br />
<tr><br />
<td>\${21 * 2}</td><br />
<td>${21 * 2}</td><br />
</tr><br />
<tr><br />
<td>\${3/4}</td><br />
<td>${3/4}</td><br />
</tr><br />
<tr><br />
<td>\${3 div 4}</td><br />
<td>${3 div 4}</td><br />
</tr><br />
<tr><br />
<td>\${3/0}</td><br />
<td>${3/0}</td><br />
</tr><br />
<tr><br />
<td>\${10%4}</td><br />
<td>${10%4}</td><br />
</tr><br />
<tr><br />
<td>\${10 mod 4}</td><br />
<td>${10 mod 4}</td><br />
</tr><br />
<tr><br />
<td>\${(1==2) ? 3 : 4}</td><br />
<td>${(1==2) ? 3 : 4}</td><br />
</tr><br />
</table><br />
</code><br />
</blockquote><br />
</body><br />
</html></source><br />
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<!-- end source code --><br />
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== JSP 2.0 Expression Language - Basic Comparisons ==<br />
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<!-- start source code --><br />
<br />
<source lang="java"><br />
<!--<br />
Licensed to the Apache Software Foundation (ASF) under one or more<br />
contributor license agreements. See the NOTICE file distributed with<br />
this work for additional information regarding copyright ownership.<br />
The ASF licenses this file to You under the Apache License, Version 2.0<br />
(the "License"); you may not use this file except in compliance with<br />
the License. You may obtain a copy of the License at<br />
http://www.apache.org/licenses/LICENSE-2.0<br />
Unless required by applicable law or agreed to in writing, software<br />
distributed under the License is distributed on an "AS IS" BASIS,<br />
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<br />
See the License for the specific language governing permissions and<br />
limitations under the License.<br />
--><br />
<html><br />
<head><br />
<title>JSP 2.0 Expression Language - Basic Comparisons</title><br />
</head><br />
<body><br />
<h1>JSP 2.0 Expression Language - Basic Comparisons</h1><br />
<hr><br />
This example illustrates basic Expression Language comparisons.<br />
The following comparison operators are supported:<br />
<ul><br />
<li>Less-than (&lt; or lt)</li><br />
<li>Greater-than (&gt; or gt)</li><br />
<li>Less-than-or-equal (&lt;= or le)</li><br />
<li>Greater-than-or-equal (&gt;= or ge)</li><br />
<li>Equal (== or eq)</li><br />
<li>Not Equal (!= or ne)</li><br />
</ul><br />
<blockquote><br />
<u><b>Numeric</b></u><br />
<code><br />
<table border="1"><br />
<thead><br />
<td><b>EL Expression</b></td><br />
<td><b>Result</b></td><br />
</thead><br />
<tr><br />
<td>\${1 &lt; 2}</td><br />
<td>${1 < 2}</td><br />
</tr><br />
<tr><br />
<td>\${1 lt 2}</td><br />
<td>${1 lt 2}</td><br />
</tr><br />
<tr><br />
<td>\${1 &gt; (4/2)}</td><br />
<td>${1 > (4/2)}</td><br />
</tr><br />
<tr><br />
<td>\${1 &gt; (4/2)}</td><br />
<td>${1 > (4/2)}</td><br />
</tr><br />
<tr><br />
<td>\${4.0 &gt;= 3}</td><br />
<td>${4.0 >= 3}</td><br />
</tr><br />
<tr><br />
<td>\${4.0 ge 3}</td><br />
<td>${4.0 ge 3}</td><br />
</tr><br />
<tr><br />
<td>\${4 &lt;= 3}</td><br />
<td>${4 <= 3}</td><br />
</tr><br />
<tr><br />
<td>\${4 le 3}</td><br />
<td>${4 le 3}</td><br />
</tr><br />
<tr><br />
<td>\${100.0 == 100}</td><br />
<td>${100.0 == 100}</td><br />
</tr><br />
<tr><br />
<td>\${100.0 eq 100}</td><br />
<td>${100.0 eq 100}</td><br />
</tr><br />
<tr><br />
<td>\${(10*10) != 100}</td><br />
<td>${(10*10) != 100}</td><br />
</tr><br />
<tr><br />
<td>\${(10*10) ne 100}</td><br />
<td>${(10*10) ne 100}</td><br />
</tr><br />
</table><br />
</code><br />
<br><br />
<u><b>Alphabetic</b></u><br />
<code><br />
<table border="1"><br />
<thead><br />
<td><b>EL Expression</b></td><br />
<td><b>Result</b></td><br />
</thead><br />
<tr><br />
<td>\${"a" &lt; "b"}</td><br />
<td>${"a" < "b"}</td><br />
</tr><br />
<tr><br />
<td>\${"hip" &gt; "hit"}</td><br />
<td>${"hip" > "hit"}</td><br />
</tr><br />
<tr><br />
<td>\${"4" &gt; 3}</td><br />
<td>${"4" > 3}</td><br />
</tr><br />
</table><br />
</code><br />
</blockquote><br />
</body><br />
</html></source><br />
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<!-- end source code --></div>