helloattributetag.java

来自「《深入学习Java Servlet》的源代码。本书作者：James Goodwi」· Java 代码 · 共 50 行

package com.djs;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspTagException;
import javax.servlet.jsp.tagext.TagSupport;

public class HelloAttributeTag extends TagSupport {

    private String name = new String();

    public HelloAttributeTag() {

    }

    // Accessor to set the name
    public void setName(String name) {

        this.name = name;
    }

    // Method called when the closing hello tag is encountered
    public int doEndTag() throws JspException {

        try {

            // We use the pageContext to get a Writer
            // We then print the text string Hello
            pageContext.getOut().print("Hello " + name);
        }
        catch (Exception e) {

            throw new JspTagException(e.getMessage());
        }
        // We want to return SKIP_BODY because this Tag does not support
        // a Tag Body
        return SKIP_BODY;
    }

    public void release() {

        // Call the parent's release to release any resources
        // used by the parent tag.
        // This is just good practice for when you start creating
        // hierarchies of tags.
        super.release();

        // Reset the name to an empty String
        name = new String();
    }
}