在这篇文章中,咱们来学习在jsp中怎样访问一个自定义的标签。就是自定义一个标签:xyz。咱们将学习访问在prefix: xyz与/prefix:xyz标签内的内容。html
<prefix: xyz> Body of custom tag: This is what we will access in the below example </prefix:xyz>
在这个例子中,咱们实现将自定义的标签中显示内容。 处理类:Details.java java
package beginnersbook.com; import javax.servlet.jsp.tagext.*; import javax.servlet.jsp.*; import java.io.*; public class Details extends SimpleTagSupport { //StringWriter object StringWriter sw = new StringWriter(); public void doTag() throws JspException, IOException { getJspBody().invoke(sw); JspWriter out = getJspContext().getOut(); out.println(sw.toString()+"Appended Custom Tag Message"); } }
TDL文件: message.tld 将 message.tld 文件放入WEB-INF 文件夹里:less
<taglib> <tlib-version>1.0</tlib-version> <jsp-version>2.0</jsp-version> <short-name>My Custom Tag: MyMsg</short-name> <tag> <name>MyMsg</name> <tag-class>beginnersbook.com.Details</tag-class> <body-content>scriptless</body-content> </tag> </taglib>
JSP文件:index.jspjsp
<%@ taglib prefix="myprefix" uri="WEB-INF/message.tld"%> <html> <head> <title>Accessing Custom Tag Body Example</title> </head> <body> <myprefix:MyMsg> Test String </myprefix:MyMsg> </body> </html>
输出:学习
Test String Appended Custom Tag Messagecode