How to create custom tags in JSP?You can create custom tags in JSP. Steps:-----1. You have to create a Java file that will define the operation of the custom tag2. For the Java file, you have to extend javax.servlet.jsp.tagext.BodyTagSupport class3. in your implementation, you have to override (re-write) doStartTag(), doEndTag(), and doAfterBody() methods4. Create tag library description file(XML file with .tld extension).Example-------Implement a tag that reverses a stringimport java.io.IOException;import javax.servlet.jsp.JspTagException;import javax.servlet.jsp.JspWriter;import javax.servlet.jsp.tagext.BodyContent;import javax.servlet.jsp.tagext.BodyTagSupport;public class ReverseTag extends BodyTagSupport { private static final long serialVersionUID = 1L; //override doStartTag public int doStartTag() throws JspTagException{ return EVAL_BODY_TAG; } //override doEndTag public int doEndTag() throws JspTagException { try { JspWriter out = pageContext.getOut(); } catch (Exception ex) { throw new JspTagException("Exception" + ex); } return SKIP_BODY; }//reverse the text public int doAfterBody() throws JspTagException { BodyContent body = getBodyContent(); try { JspWriter out = body.getEnclosingWriter(); //get text inside the tag String bodyContent = body.getString(); //reverse the text if (bodyContent != null) { for (int i = bodyContent.length() - 1; i >= 0; i--) { out.print(bodyContent.charAt(i)); } } out.println(); body.clearBody(); // Clear for next evaluation } catch (IOException ioe) { throw new JspTagException("Exception at doAfterBody " + ioe); } return (SKIP_BODY); }}5. Create the taglib descriptor 1.0 1.1 stringreverse net.justetc.taglibrary.ReverseTag Reverse the text 6. Example use of the custom tag Custom Tag library
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Post Data:2010-05-23 22:42:48
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