lookuptag.java

21天精通Java,这是一本英文书

package demo;

import javax.naming.*;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;

public class LookupTag extends TagSupport {
    private String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int doStartTag() throws JspException {
        String msg = null;
    	try {
	        Context ic = new InitialContext();
	        msg = ic.lookup(name).toString();
    	}
    	catch (NamingException ex) {
 	    	msg = ex.toString();
   	    }
    	catch (ClassCastException ex) {
 	    	msg = ex.toString();
        }
        try {
            pageContext.getOut().print(msg);
        }
        catch (Exception ex) {
            throw new JspTagException("LookupTag: "+ex);
        }
        return SKIP_BODY;
     }

    public int doEndTag() {
        return EVAL_PAGE;
    }
}