/*
 * Generated by MyEclipse Struts
 * Template path: templates/java/JavaClass.vtl
 */
package www.xwcms.net.struts.action;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.text.DecimalFormat;
import java.util.Iterator;
import java.util.List;
import java.util.Random;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.DispatchAction;

/** 
 * MyEclipse Struts
 * Creation date: 10-06-2013
 * 
 * XDoclet definition:
 * @struts.action parameter="method" validate="true"
 */
public class UploadFileAction extends DispatchAction {
	
	/**
	 * 简介：上传附件
	 * 作者：www.xwcms.net
	 * @throws UnsupportedEncodingException 
	 * 
	 */
	
	@SuppressWarnings( { "deprecation", "unchecked" })
	// 上传文件方法 前台调用
	public ActionForward fileAdd(ActionMapping mapping,
			ActionForm form, HttpServletRequest request,
			HttpServletResponse response) throws UnsupportedEncodingException {
		response.setCharacterEncoding("UTF-8"); //防止返回文件名是乱码 
		request.setCharacterEncoding("UTF-8");
		//获取前台页面数据
		String sizeLimit = request.getParameter("sizeLimit");//限制图片上传大小值
		
		boolean backValue=false;
		PrintWriter out = null;
		ThreadLocal<String> returnStr = new ThreadLocal<String>();
		
		String extName = ""; // 保存文件拓展名
		String newFileName = ""; // 保存新的文件名
		String ranFileName = getRandomFileName(); // 保存随机文件名
		String savePath = getAbsoluteBasePath(request); // 获取项目根路径
		savePath = savePath + "/uploadFile/"; //上传保存文件的路径
		File fa=new File(savePath);
		if(!fa.exists())//判断文件夹是否存在
		{
			fa.mkdir();
		}
		// 处理上传的文件
		boolean isMultipart = ServletFileUpload.isMultipartContent(request);
		if (isMultipart) {
			try {
				FileItemFactory factory = new DiskFileItemFactory();
				ServletFileUpload fileUpload = new ServletFileUpload(factory);
				// 设置文件大小(超过int 的范围会报错 注意 )
				fileUpload.setSizeMax(1024 * 1024 * Long.parseLong(sizeLimit));
				
				// 获得请求中的文件列表
				List<FileItem> files = fileUpload.parseRequest(request);
				System.out.println(files.size());
				// 获得迭代器
				Iterator<FileItem> iterator = files.iterator();
				while (iterator.hasNext()) {
					FileItem item = iterator.next();
					if (!item.isFormField()) {
						String imgName = item.getName(); // 获得图片名称，此文件名包括路径
						double fileSize = item.getSize();
						double size = fileSize / 1024;
						DecimalFormat df = new DecimalFormat("########.00 ");
						String   imgSize= df.format(size);//获取图片大小 
						if (imgName.lastIndexOf(".") >= 0) {
							extName = imgName.substring(imgName.lastIndexOf(".")); // 获得文件的扩展名
						}
						System.out.println(imgName);
						returnStr.set(imgName);
						newFileName = ranFileName + extName; // 文件重新命名
						File fileupload = new File(savePath + newFileName);// 生成抽象文件
						item.write(fileupload); // 上传图片到uploadImg文件夹
					

						/**
						 * 这里可以将上传附件信息添加到数据
						 */
					
					}
				}
			} catch (FileUploadException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			 try {
						out = response.getWriter();
						out.print("【"+returnStr.get()+"】" + "上传成功!");
						out.flush();
						out.close();
					
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
		}
		
		return null;
	}
	/**
	 *  获得项目的根路径
	 * @param request
	 * @return
	 */
	private String getAbsoluteBasePath(HttpServletRequest request) {
		return request.getSession().getServletContext().getRealPath("/");
	}

	/**
	 *  生成随机文件名：当前年月日时分秒+五位随机数
	 * @return
	 */
	private String getRandomFileName() {
		//SimpleDateFormat sDateFormat;
		Random r = new Random();
		int rannum = (int) (r.nextDouble() * (99999 - 10000 + 1)) + 10000; // 获取随机数
		//sDateFormat = new SimpleDateFormat("yyyyMMdd"); // 时间格式化的格式
		return rannum+""; // 当前时间
	}
}