在這篇文章中,咱們來學習在jsp中怎樣訪問一個自定義的標籤。就是自定義一個標籤:xyz。咱們將學習訪問在prefix: xyz與/prefix:xyz標籤內的內容。html
<prefix: xyz> Body of custom tag: This is what we will access in the below example </prefix:xyz>
在這個例子中,咱們實現將自定義的標籤中顯示內容。 處理類: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 將 message.tld 文件放入WEB-INF 文件夾裏: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>
輸出:學習
Test String Appended Custom Tag Messagecode