jsp实现多文件上传

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1.新建一个Dynamic Web Project项目，整体的框架如图所示：

2.UploadServlet.java里面的代码如下所示：

package servlet;import java.io.File;import java.io.IOException;import java.util.Iterator;import java.util.List;import javax.servlet.RequestDispatcher;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.commons.fileupload.FileItem;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;import util.MyUtil;@WebServlet(name = "upload", urlPatterns = { "/upload" })public class UploadServlet extends HttpServlet {private static final long serialVersionUID = 1L;protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {doPost(request, response);}protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {DiskFileItemFactory itemFactory = new DiskFileItemFactory();File tempDir = new File("D:\\temp");if (!tempDir.exists()) {tempDir.mkdir();}itemFactory.setRepository(tempDir);ServletFileUpload sfu = new ServletFileUpload(itemFactory);sfu.setFileSizeMax(10 * 1024 * 1024);List<FileItem> fileItems = null;RequestDispatcher dis1 = request.getRequestDispatcher("uploadSuccess.jsp");RequestDispatcher dis2 = request.getRequestDispatcher("uploadFail.jsp");try {fileItems = sfu.parseRequest(request);Iterator<FileItem> itr = fileItems.iterator();File uploadFileDir = new File("D:\\uploadFile");if (!uploadFileDir.exists()) {uploadFileDir.mkdir();}while (itr.hasNext()) {FileItem fitem = itr.next();if (!fitem.isFormField()) {String name = fitem.getName();long size = fitem.getSize();if ((name == null || "".equals(name)) && size == 0) {continue;}int index = name.lastIndexOf(File.separator);if (index > 0) {name = name.substring(index + 1, name.length());}String fileType = name.substring(name.lastIndexOf("."));String newName = MyUtil.getStringID() + fileType;File newFile = new File(uploadFileDir, newName);fitem.write(newFile);}}dis1.forward(request, response);} catch (Exception e) {e.printStackTrace();dis2.forward(request, response);}}}

3.MyUtil.java里面的代码如下所示：

package util;import java.text.SimpleDateFormat;import java.util.Date;import javax.servlet.http.HttpServletRequest;public class MyUtil {public static String getStringID() {String id = null;Date date = new Date();SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmssSS");id = sdf.format(date);return id;}public static String getParameter(HttpServletRequest request, String name) {return (String) request.getAttribute(name);}}

4.selectFile.jsp里面的代码如下所示：

<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><!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>example</title></head><body><form action="upload" method="post" enctype="multipart/form-data"><table><tr><td>请选择要上传的文件：</td><td><input type="file" name="firstFile"></td></tr><tr><td>请选择要上传的文件：</td><td><input type="file" name="secondFile"></td></tr><tr><td align="right"><input type="reset" value="重填"></td><td><input type="submit" value="上传"></td></tr></table></form></body></html>

5.uploadSuccess.jsp里面的代码如下所示：

<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><!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>example</title></head><body><h2>上传成功！</h2></body></html>

6.uploadFail.jsp里面的代码如下所示：

<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><!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>example</title></head><body><h2>上传失败！</h2></body></html>

7.在浏览器里面输入http://localhost:8080/Servlet/selectFile.jsp运行之后得到的结果如下所示：

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