nextformtag.java

一个用struts tiles的在线影院web系统

package com.eline.common.taglib;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;
import javax.servlet.jsp.JspTagException;
import java.io.IOException;
import javax.servlet.jsp.JspWriter;

public class NextFormTag extends TagSupport {

	private static final long serialVersionUID = 5543378892830363703L;

    private String action;
    private ListTag listTag;
    private String method;

    public NextFormTag() {
        action = null;
        listTag = null;
        method = "POST";
	}

    /**
     * 
     * @throws JspException
     */
	public int doStartTag() throws JspException {
		listTag = (ListTag) TagSupport.findAncestorWithClass(this, ListTag.class);
        if(listTag == null)
            throw new JspTagException("NextFormTag: nextForm tag not inside listtag");
        
        if (!listTag.hasNextForm())
        	return SKIP_BODY;
        if ((listTag.pageIndex + 1) >= listTag.totalPages)
        	return SKIP_BODY;
        
        try {
            JspWriter jspWriter = pageContext.getOut();
            jspWriter.println("<form method=\"" + method + "\" action=\"" + action + "\">");
            jspWriter.println("<input type=\"hidden\" name=\"" + listTag.getParamPrefix() + listTag.getPageIndexParam() + "\" value=\"" + (listTag.getPageIndex() + 1) + "\" />");
            jspWriter.println("<input type=\"hidden\" name=\"" + listTag.getParamPrefix() + listTag.getNextParam() + "\" value=\"true\" />");

        } catch (IOException e) {
        	System.out.print("NextFormTag: error printing <form> tag");
        }
		return 1;
	}

	/**
	 * 
	 * @throws JspException
	 */
	public int doEndTag() throws JspException {
        if (listTag.hasNextForm())
			try {
				JspWriter jspWriter = pageContext.getOut();
				jspWriter.println("</form>");
			} catch (IOException e) {
				System.out.print("NextFormTag: error printing <form> tag");
			}
		return 6;
	}

	public void setAction(String action) {
		this.action = action;
	}

	public void setMethod(String method) {
        if(method != null && !method.equals("") && !method.equalsIgnoreCase("null"))
            this.method = method;
        else
            this.method = "POST";
	}
}