filefieldabstract.java

java 写的一个新闻发布系统

package org.jahia.taglibs.field.file;

import org.jahia.data.files.JahiaFileField;
import org.jahia.exceptions.*;
import org.jahia.services.pages.*;
import org.jahia.utils.*;

import java.io.*;
import java.util.*;

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



/**
 * Class FileFieldAbstractTag : abstract class for the FileField tag
 *              This class will be extended by all the classes which
 *              want to display a JahiaFileField attribute.
 *              It retrieves the current JahiaFileField and call a method
 *              which returns an attribute of this object.
 *              The attribute is defined in each subclass.
 *
 * @author  Jerome Tamiotti
 */
public abstract class FileFieldAbstract extends TagSupport {
 
	protected JahiaFileField theFile = null;

    public int doStartTag() throws JspTagException {

		ServletRequest request = pageContext.getRequest();
		// retrieves the enclosing FileField tag
		FileFieldTag fileTag = (FileFieldTag) findAncestorWithClass(this, FileFieldTag.class);
		if (fileTag == null) {
			return SKIP_BODY;
		}
		// reads the file
		theFile = fileTag.getFile();
		if (theFile == null) {
			return SKIP_BODY;
		}
		try {
			JspWriter out = pageContext.getOut();
			out.print(getField());
		} catch (IOException ioe) {
			JahiaConsole.println("FileFieldAbstract: doStartTag ",ioe.toString());
		}
		return SKIP_BODY;
	}

	// will be implemented in the classes mentionned above
    public abstract String getField();

}