自定義標籤
1.編寫標籤處理類，繼承SimpleTagSupport
package mytag;
import java.io.IOException;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.SimpleTagSupport;
publicclass HelloTag extendsSimpleTagSupport{
@Override
publicvoiddoTag() throws JspException, IOException {
this.getJspContext().getOut().write("Hello World");
}
}
2.標籤處理類必須在包裏，不能是裸體類
3.在WEB-INF目錄或子目錄下建立一個helloworld.tld
<?xmlversion="1.0"encoding="UTF-8"?>
<taglibxmlns="http://java.sun.com/xml/ns/j2ee"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"version="2.0"xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd">
<tlib-version>1.0</tlib-version>
<short-name>mytag</short-name>
<uri>/helloworldtaglib</uri>
<tag>
<name>helloworld</name>
<tag-class>mytag.HelloTag</tag-class>
<body-content>empty</body-content>
</tag>
</taglib>
4.建立testTag.jsp
<%@pagelanguage="java"contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglibprefix="mytag"uri="/helloworldtaglib"%>
<!DOCTYPEhtmlPUBLIC"-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<metahttp-equiv="Content-Type"content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<mytag:helloworld/>
</body>
</html>
實例二
1.WEB-INF/product.tld
<?xmlversion="1.0"encoding="UTF-8"?>
<taglibxmlns="http://java.sun.com/xml/ns/j2ee"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"version="2.0"xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd">
<tlib-version>1.0</tlib-version>
<short-name>product</short-name>
<uri>/producttaglib</uri>
<tag>
<name>list</name>
<tag-class>mytag.ProductTag</tag-class>
<body-content>empty</body-content>
</tag>
</taglib>
2.
package mytag;
import java.io.IOException;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.SimpleTagSupport;
publicclass ProductTag extends SimpleTagSupport{
@Override
publicvoid doTag() throws JspException, IOException {
this.getJspContext().getOut().write("**********");
}
}
3.
<%@pagelanguage="java"contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglibprefix="mytag"uri="/helloworldtaglib"%>
<%@taglibprefix="product"uri="/producttaglib"%>
<!DOCTYPEhtmlPUBLIC"-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<metahttp-equiv="Content-Type"content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<mytag:helloworld/>
<product:list/>
</body>
</html>