nocachetag.java

来自「jsp 设计第二版的源代码实例精讲 很不错的」· Java 代码 · 共 28 行

package com.ora.jsp.tags;

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

/**
 * This class is a custom action for setting response headers
 * that prevent the page from being cached by a browser or
 * proxy server.
 *
 * @author Hans Bergsten, Gefion software <[e-mail]>
 * @version 2.0
 */
public class NoCacheTag extends TagSupport {
    /**
     * Sets "no cache" response headers
     */
    public int doEndTag() throws JspException {
        HttpServletResponse response = 
            (HttpServletResponse) pageContext.getResponse();
        response.addHeader("Pragma", "No-Cache");
        response.setHeader("Cache-Control", "No-Cache");
        response.setDateHeader("Expires", 0);
        return EVAL_PAGE;
    }
}