java commons-fileupload servlet 多文件上传

commons-fileupload servlet 多文件上传

需要引入的 jar 包。

commons-fileupload-1.3.2.jar

commons-io-2.2.jar

JSP 页面：

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
	<head>
		<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
		<title>批量上传</title>
	</head>
	<body>
		<form name="uploadForm" method="post" action="UoloadServlet" enctype="multipart/form-data">
			<table border="1">
				<thead>
					<tr>
						<th>名称</th>
						<th>文件</th>
					</tr>
				</thead>
				<tbody>
					<c:forEach begin="1" end="10" var="i">
						<tr>
							<td>文件${i}</td>
							<td><input type="file" name="file"></td>
						</tr>
					</c:forEach>
				</tbody>
			</table>
		<input type="submit" name="submit" value="开始上传">
		</form>
	</body>
</html>

servlet 页面

package com.servlet;

import java.io.File;
import java.io.IOException;
import java.util.List;

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

import com.util.FileUtil;

/**
 * Servlet implementation class uoloadServlet
 */
public class UoloadServlet extends HttpServlet {

	private static final long serialVersionUID = 1L;

	/**
	 * @see HttpServlet#HttpServlet()
	 */
	public UoloadServlet() {
		
		super();
	}

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
	 *      response)
	 */
	protected void doGet(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		
		doPost(request, response);
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
	 *      response)
	 */
	protected void doPost(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {

		// 文件上传的路径，这里设置的是服务器项目根路径下的 IMG 目录
		String filePath = request.getSession().getServletContext().getRealPath("/")+ "IMG/";

		// 获取照片上传工具类，并且批量上传照片文件
		List<File> files = FileUtil.getInstance(filePath).upload(request);

		// 将上传成功照片的照片传值到页面
		request.setAttribute("files", files);

		request.getRequestDispatcher("list.jsp").forward(request, response);
	}
}

FileUtil.java

package com.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;

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.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class FileUtil {

	// 文件上传路径
	private static String UPLOAD_PATH = null;

	/**
	 * @author Duke 静态内部类，实例化工具类
	 */
	private static class LazyHolder {

		private static final FileUtil FILEUTIL = new FileUtil();
	}

	/**
	 * 私有构造函数
	 */
	private FileUtil() {

	}

	/**
	 * 获取工具类实例
	 * 
	 * @return FileUploadUtil 实例
	 */
	public static FileUtil getInstance(String uploadPath) {

		UPLOAD_PATH = uploadPath;
		return LazyHolder.FILEUTIL;
	}

	/**
	 * 文件批量上传
	 * 
	 * @param request
	 * @param uploadPath
	 * 
	 */
	public List<File> upload(HttpServletRequest request) {

		// 用于存放上传成功的照片
		List<File> files = new ArrayList<File>();

		try {

			FileItemFactory factory = new DiskFileItemFactory();
			ServletFileUpload upload = new ServletFileUpload(factory);

			List<FileItem> items = upload.parseRequest(request);

			for (FileItem fileItem : items) {
				
				// 获得文件名，包括文件路径
				String fileFullName = fileItem.getName();

				if (fileFullName != null && fileFullName != "" && fileItem.getSize() > 0) {

					// 获取文件路径
					String fileName = new File(fileFullName).getName();

					// 创建文件
					File savedFile = new File(UPLOAD_PATH, fileName);

					// 如果文件所在文件夹不存在的话，新建文件夹
					if (!savedFile.getParentFile().exists()) {
						savedFile.getParentFile().mkdirs();
					}

					// 写入文件
					fileItem.write(savedFile);
					files.add(savedFile);
				}
			}
		} catch (Exception e) {
			
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		return files;
	}
	
	/**
	 * 文件下载
	 * 
	 * @param filePath
	 * @throws IOException 
	 * @throws Exception
	 */
	public void downLoadFile(String filePath, HttpServletResponse response) throws IOException {
		
		// 处理中文乱码问题
		filePath = new String(filePath.getBytes("ISO-8859-1"), "UTF-8");
		
		downLoadFile(new File(filePath), response);
	}
	
	/**
	 * 文件下载 
	 * 
	 * @param file
	 * @throws IOException 
	 */
	public void downLoadFile(File file, HttpServletResponse response) throws IOException {
		
		if (file.exists()) {
			
			response.reset();
			response.setContentType("application/x-download");
			response.addHeader("Content-Disposition", "attachment; filename=\"" + URLEncoder.encode(file.getName(), "UTF-8"));
			
			// 输出文件字节流
			writeBufferByte(file, response);
		}
	}
	
	/**
	 * 输出照片字节流
	 * 
	 * @throws IOException 
	 */
	public void outputImgByte(String filePath, HttpServletResponse response) throws IOException {
		
		// 处理中文乱码问题
		filePath = new String(filePath.getBytes("ISO-8859-1"), "UTF-8");
		outputImgByte(new File(filePath), response);
	}
	
	/**
	 * 输出照片字节流
	 * 
	 * @throws IOException 
	 */
	public void outputImgByte(File file, HttpServletResponse response) throws IOException {
		
		// 文件存在的情况下输出文件
		if (file.exists()) {

			// 设置相应信息的类型
			response.setContentType("image/jpeg");

			// 输出文件字节流
			writeBufferByte(file, response);
		}
	}
	
	/**
	 * 输出文件字节流
	 * 
	 * @param file
	 * @param response
	 * @throws IOException
	 */
	private void writeBufferByte(File file, HttpServletResponse response) throws IOException {
		
		// 一次读 2048 个字节
		byte[] buffer = new byte[2048];

		// 获取照片流
		FileInputStream fos = new FileInputStream(file);

		int count;

		while ((count = fos.read(buffer)) > 0) {

			// 输出照片流
			response.getOutputStream().write(buffer, 0, count);
		}

		fos.close();
	}
}

查看源码

posted @ 2016-12-29 13:58 Duke-码动青春阅读(204) 评论(0) 收藏举报

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java commons-fileupload servlet 多文件上传

commons-fileupload servlet 多文件上传

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