表单里有上传文件

在servlet里的代码如下：

String[] string = { "title", "type", "content"};//表单里其他内容的name
String filename = FileSave.save(request, response, string); // 保存文件获取保存的文件名称
map = FileSave.map;//获取值

 

   下面是公共类：

 

package cn.com.crystalnet.common;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

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

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.FileUploadBase.SizeLimitExceededException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
/**
 * title:处理文件上传
 * @author 王立壮
 *
 */

public class FileSave {
	
	public static Map map = null;

	public static String save(HttpServletRequest request, HttpServletResponse response,String[] paramName) {
		
		String u_name = null;
		
		map = new HashMap();
		
		final long MAX_SIZE = 3 * 1024 * 1024;// 设置上传文件最大为 3M
		// 允许上传的文件格式的列表
		final String[] allowedExt = new String[] { "gif","jpg","png","word","excel","txt","zip","ppt","pdf"  };
		response.setContentType("text/html");
		// 设置字符编码为UTF-8, 这样支持汉字显示
		response.setCharacterEncoding("UTF-8");

		// 实例化一个硬盘文件工厂,用来配置上传组件ServletFileUpload
		DiskFileItemFactory dfif = new DiskFileItemFactory();
		dfif.setSizeThreshold(4096);// 设置上传文件时用于临时存放文件的内存大小,这里是4K.多于的部分将临时存在硬盘
		dfif.setRepository(new File(request.getRealPath("/")
				+ "ImagesUploadTemp"));// 设置存放临时文件的目录,web根目录下的ImagesUploadTemp目录

		// 用以上工厂实例化上传组件
		ServletFileUpload sfu = new ServletFileUpload(dfif);
		// 设置最大上传尺寸
		sfu.setSizeMax(MAX_SIZE);

		PrintWriter out = null;
		try {
			out = response.getWriter();
		} catch (IOException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
		// 从request得到 所有 上传域的列表
		List fileList = null;
	
		try {
			fileList = sfu.parseRequest(request);
			
			if (fileList != null) {
				for (Iterator itr = fileList.iterator(); itr.hasNext();) {
					FileItem fileItem = (FileItem) itr.next();
					for (int i = 0; i < paramName.length; i++) {
						if (fileItem.getFieldName().equalsIgnoreCase(
								paramName[i])) {
							map.put(fileItem.getFieldName(), new String(fileItem.getString().getBytes("ISO8859-1"),"UTF-8"));// 中文转码
						}
					}
				}
			}
			
			System.out.println(fileList.size());
		} catch (FileUploadException e) {// 处理文件尺寸过大异常
			if (e instanceof SizeLimitExceededException) {
				out.println("文件尺寸超过规定大小:" + MAX_SIZE + "字节<p />");
				out.println("<a href=\"UserCenter.jsp\" target=\"_top\">返回</a>");

			}
			e.printStackTrace();
		} catch (UnsupportedEncodingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		// 没有文件上传
		if (fileList == null || fileList.size() == 0) {
			out.println("请选择上传文件<p />");
			out.println("<a href=\"UserCenter.jsp\" target=\"_top\">返回</a>");

		}
		// 得到所有上传的文件
		Iterator fileItr = fileList.iterator();
		// 循环处理所有文件

		while (fileItr.hasNext()) {
			FileItem fileItem = null;
			String path = null;
			long size = 0;
			// 得到当前文件
			fileItem = (FileItem) fileItr.next();
			// 忽略简单form字段而不是上传域的文件域(<input type="text" />等)
			if (fileItem == null || fileItem.isFormField()) {
				continue;
			}
			// 得到文件的完整路径
			path = fileItem.getName();
			// 得到文件的大小
			size = fileItem.getSize();
			if ("".equals(path) || size == 0) {
				out.println("请选择上传文件<p />");
				out.println("<a href=\"UserCenter.jsp\" target=\"_top\">返回</a>");
				break;

			}

			// 得到去除路径的文件名
			String t_name = path.substring(path.lastIndexOf("\\") + 1);
			// 得到文件的扩展名(无扩展名时将得到全名)
			String t_ext = t_name.substring(t_name.lastIndexOf(".") + 1);
			// 拒绝接受规定文件格式之外的文件类型
			int allowFlag = 0;
			int allowedExtCount = allowedExt.length;
			for (; allowFlag < allowedExtCount; allowFlag++) {
				if (allowedExt[allowFlag].equals(t_ext))
					break;
			}
			if (allowFlag == allowedExtCount) {
				out.println("请上传以下类型的文件<p />");
				for (allowFlag = 0; allowFlag < allowedExtCount; allowFlag++)
					out.println("*." + allowedExt[allowFlag]
							+ "&nbsp;&nbsp;&nbsp;");
				out
						.println("<p /><a href=\"UserCenter.jsp\" target=\"_top\">返回</a>");

			}

			long now = System.currentTimeMillis();
			// 根据系统时间生成上传后保存的文件名
			String prefix = String.valueOf(now);
			// 保存的最终文件完整路径,保存在web根目录下的ImagesUploaded目录下
			u_name = request.getRealPath("/") + "Back\\mailUpload\\"
					+ prefix + "." + t_ext;
			try {
				// 保存文件
				fileItem.write(new File(u_name));
				u_name = "mailUpload/"+ prefix + "." + t_ext;
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
		
			
		return u_name;
	}

}