1. 新建java类,继承TagSupport类
2. 覆盖doStartTag()方法,在该方法中编写jsp页面中的java代码
3. ServletRequest request = this.pageContext.getRequest(); //获得request对象
JspWriter out = this.pageContext.getOut();//获得输出流
4. 在WEB-INF目录下新建tld文件:
<?xml version="1.0" encoding="UTF-8" ?><taglib xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd" version="2.0">
<tlib-version>1.0</tlib-version>
<short-name>SimpleTagLibrary</short-name>
<uri>http:www.test.com</uri> <tag>
<name>viewIP</name>
<tag-class>aaaaa.viewIPTag</tag-class>
<body-content>empty</body-content> </tag>
<function>
<description>Converts the string to all caps</description>
<name>caps</name>
<function-class>jsp2.examples.el.Functions</function-class>
<function-signature>java.lang.String caps( java.lang.String )</function-signature>
</function>
</taglib></taglib>
5. 编辑<uri></uri>内容
6. 在页面中引入标签。
原文地址:http://blog.csdn.net/u014682413/article/details/45767987