java code for Logo Tag

package com.java2s;


///Custom tag
import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.BodyTagSupport;
import javax.servlet.jsp.tagext.TryCatchFinally;

/**
* This tag generates a thumbnail image using HTML img tag, next to text
* message. The user specifies the content of the message and the Heading level
* (i.e.,
*

-
*

)
*/

public class LogoTag extends BodyTagSupport implements TryCatchFinally {

private String heading = null;

private String image = null;

//stamp.gif, 42 x 54
private String width = null;

private String height = null;

public int doStartTag() throws JspException {

//this method assumes that attribute properties have been set.
try {

int h = new Integer(heading).intValue();

if (!(h > 0 && h < 7))
throw new JspException(
"The 'heading' attribute value must between 1 and 6 inclusive.");

} catch (Exception e) {
throw new JspException(e.getMessage());
}

return EVAL_BODY_BUFFERED;

}

public int doEndTag() throws JspException {

JspWriter out = pageContext.getOut();
String imgDir = ((HttpServletRequest) pageContext.getRequest())
.getContextPath()
+ "/images/";
String message = getBodyContent().getString().trim();
try {
out.println(new StringBuffer(" image).append("\" width=\"").append(width).append(
"\" height=\"").append(height).append("\" align=\"left\">")
.append("").append(message)
.append("").toString());

} catch (java.io.IOException io) {
}

return EVAL_PAGE;
}

public void doCatch(Throwable t) {

try {

pageContext.getOut().println(t.getMessage() + "
");

} catch (java.io.IOException io) {
}
}

public void doFinally() {

//do nothing here, since we don't have any resources open
//like database connections

}

public void setHeading(String level) {

this.heading = level;

}

public void setImage(String name) {

this.image = name;

}

public void setWidth(String width) {

this.width = width;

}

public void setHeight(String height) {

this.height = height;

}

public void release() {

heading = null;
image = null;
width = null;
height = null;

}

}
//
package com.java2s;

import java.io.IOException;

import javax.servlet.jsp.JspContext;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.SimpleTagSupport;

/**
* This tag generates a thumbnail image using HTML img tag, next to text
* message. The user specifies the content of the message and the Heading level
* (i.e.,
*

-
*

)
*/

public class SimpleLogoTag extends SimpleTagSupport {

private String heading = null;

private String image = null;

private String width = null;

private String height = null;

public void doTag() throws JspException, IOException {

JspContext jspContext = getJspContext();

//this method assumes that attribute properties have been set.
try {

int h = new Integer(heading).intValue();

if (!(h > 0 && h < 7))
throw new JspException(
"The 'heading' attribute value must between 1 and 6 inclusive.");

} catch (Exception e) {
throw new JspException(e.getMessage());
}

JspWriter out = jspContext.getOut();

String imgDir = (String) jspContext.findAttribute("imgDir");

if (imgDir == null || "".equals(imgDir))
throw new JspException(
"No attribute provided specifying the application's image directory.");

out.println(new StringBuffer(" .append(image).append("\" width=\"").append(width).append(
"\" height=\"").append(height).append(
"\" align=\"left\">").append(" .append(">").toString());
getJspBody().invoke(null);
out.println(new StringBuffer("")
.toString());

}

public void setHeading(String level) {

this.heading = level;

}

public void setImage(String name) {

this.image = name;

}

public void setWidth(String width) {

this.width = width;

}

public void setHeight(String height) {

this.height = height;

}

}
//logo.tag
<%@ tag body-content="scriptless" description="Writes the HTML code for inserting a logo." %>

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<%@ attribute name="heading" required="true" rtexprvalue=
"true" description="The heading level for the logo."%>

<%@ attribute name="image" required="true" rtexprvalue=
"true" description="The image name for the logo."%>

<%@ attribute name="width" required="true" rtexprvalue=
"true" description="The image width for the logo."%>

<%@ attribute name="height" required="true" rtexprvalue=
"true" description="The image height for the logo."%>

"${width}" height="${height}" align="left">




//logoTest.jsp
<%@ taglib uri="java2s.com.tags" prefix="cbck" %>



<% session.setAttribute("imgDir",(request.getContextPath() + "/images/")) %>
Thanks for visiting

Here's all the other stuff this page contains...



//myTag.tld




1.0
2.0
cbck
java2s.com.tags
Cookbook custom tags


com.java2s.ReqListener



logo
com.java2s.LogoTag
scriptless
This tag writes a logo inside the JSP.

heading
true
true
The heading level for the logo; 1 through 6.



image
true
true
The image name for the logo.



width
true
true
The image width for the logo.



height
true
true
The image height for the logo.