hello.Functions

/*

* 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 hello;

/**

*

* @author iridiumcao@gmail.com

*

*/

public class Functions {

public static String reverse(String text) {

return new StringBuffer(text).reverse().toString();

}

public static int getStringSize(String string) {

return string.length();

}

}

这个文件改写自 Tomcat 的例子,故保留这段 License 信息。

这里的方法必须是 public static 的,否者 EL 无法调用。

如果写接受多个参数的方法,也是可以的,调用的时候传入进去就行了。返回类型也不一定要是 String, 这里就用了 int.