monitoreddiskfileitem.java

文件的上传下载

package book.upload;

import java.io.File;
import java.io.IOException;
import java.io.OutputStream;

import org.apache.commons.fileupload.disk.DiskFileItem;

/**
 * 监控磁盘文件类
 * 
 * @author Administrator
 * 
 */
public class MonitoredDiskFileItem extends DiskFileItem {

	private MonitoredOutputStream mos = null;

	private OutputStreamListener listener;

	/**
	 * 监控磁盘文件
	 * @param fieldName 场所名称
	 * @param contentType 容量类型
	 * @param isFormField 是否形成字段
	 * @param fileName 文件名
	 * @param sizeThreshold 开始字节
	 * @param repository 文件存放处, 储藏室
	 * @param listener 监听
	 */
	public MonitoredDiskFileItem(String fieldName, String contentType,
			boolean isFormField, String fileName, int sizeThreshold,
			File repository, OutputStreamListener listener) {
		super(fieldName, contentType, isFormField, fileName, sizeThreshold,
				repository);
		this.listener = listener;
	}

	public OutputStream getOutputStream() throws IOException {
		if (mos == null) {
			mos = new MonitoredOutputStream(super.getOutputStream(), listener);
		}
		return mos;
	}
}