JSP文件上传下载---上传篇

来源：互联网发布：python招聘工资怎么样编辑：程序博客网时间：2024/06/15 02:48

文件上传到本地磁盘同时将信息出入数据库：

上传JSP页面中利用js能添加多个文件同时上传：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <title>上传页面</title><script type="text/javascript">function addfiles(){var filesDiv = document.getElementById("files");var fileInput = document.createElement("input");fileInput.type="file";fileInput.name="浏览";var delButton = document.createElement("input");delButton.type="button";delButton.value="删除";delButton.onclick=function del(){this.parentNode.parentNode.removeChild(this.parentNode);}var div = document.createElement("div");div.appendChild(fileInput);div.appendChild(delButton);filesDiv.appendChild(div);}</script>  </head>    <body>    <form action="${pageContext.request.contextPath }/uploadServlet.do" method="post" enctype="multipart/form-data">     <table>     <tr>     <td>用户名:</td><td><input type="text" name="username"/></td><td></td>      </tr>     <tr>     <td></td><td><input type="button" value="添加文件" onclick="addfiles()"/></td><td></td>      </tr>     <tr>     <td></td><td><input type="file" name="浏览"/></td><td></td>      </tr>     <tr>     <td></td><td><div id="files"></div></td><td></td>      </tr>     <tr>     <td></td><td><input type="submit" value="上传"/></td><td></td>      </tr>     </table>    </form>        ${message}  </body></html>

最终要的是servlet中

package cn.csdn.web.servlet;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.io.UnsupportedEncodingException;import java.sql.Blob;import java.sql.SQLException;import java.util.List;import java.util.UUID;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.sql.rowset.serial.SerialBlob;import javax.sql.rowset.serial.SerialException;import org.apache.commons.fileupload.FileItem;import org.apache.commons.fileupload.FileUploadBase.FileSizeLimitExceededException;import org.apache.commons.fileupload.FileUploadException;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;import sun.print.resources.serviceui;import cn.csdn.web.dao.UploadDao;import cn.csdn.web.dao.UploadDaoImpl;import cn.csdn.web.domain.Upload;public class UploadFilesServlet extends HttpServlet {/** * @author sword */private static final long serialVersionUID = 1L;UploadDao uDao = new UploadDaoImpl();Upload entity = new Upload();@SuppressWarnings({ "unchecked", "unchecked" })public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("utf-8");try {//1、创建工厂对象DiskFileItemFactory factory = new DiskFileItemFactory();//2、设置临时文件路径factory.setRepository(new File("d:\\test"));//3、得到上传文件解析器ServletFileUpload upload = new ServletFileUpload(factory);//4、处理乱码问题upload.setHeaderEncoding("utf-8");//5、设定文件上传大小限制//upload.setSizeMax(1024*1024);//6、进行解析  得到存放FileItem的List对象List<FileItem> list ;list = upload.parseRequest(request);for(FileItem item : list){if(item.isFormField()){String paramName = item.getFieldName();String paramValue = item.getString("utf-8");System.out.println("普通输入项" + paramName + " = " + paramValue);entity.setName(paramValue);}else{//获取上传文件名String fileName = item.getName();//如果文件名有目录，则去掉目录部分，只保留文件名fileName = fileName.substring(fileName.lastIndexOf("\\")+1);System.out.println("name = " + fileName);if(!fileName.equals("")){//处理同名问题  名字前加UUID处理  调用refactorFile方法String uuidName = refactorFileName(fileName);System.out.println("uuidName==="+uuidName);//测试代码entity.setFileName(uuidName);//将信息存入到数据库中InputStream is = item.getInputStream();//上传文件位置生成指定的二级路径  调用方法String basepath = this.getServletContext().getRealPath("WEB-INF/upload");String finalPath = generateFilePath(basepath,uuidName);//文件的完整路径+名字+后缀String finalName = finalPath.substring(finalPath.indexOf("_")+1);//得到文件的真实名字System.out.println("finalName==="+finalName);entity.setFilePath(finalPath);//将信息存入到数据库中entity.setFile(item.get());//将上传文件存入到数据库中File file = new File(finalPath);FileOutputStream fos = new FileOutputStream(file);byte[] buffer = new byte[1024];int len = 0;while((len=is.read(buffer))!=-1){fos.write(buffer, 0, len);}uDao.insert(entity);fos.flush();fos.close();is.close();item.delete();request.setAttribute("message", "文件上传成功");  }} }}catch(FileSizeLimitExceededException e1){e1.printStackTrace();request.setAttribute("message", "上传文件尺寸太大！！！");}catch(FileUploadException e){e.printStackTrace();request.setAttribute("message", "bbbb文件上传失败");}request.getRequestDispatcher("/upload.jsp").forward(request, response);}private String generateFilePath(String basepath, String uuidName) {int hashcode = uuidName.hashCode();int dir1 = hashcode & 0xf;int dir2 = (hashcode >> 4) & 0xf;String path = basepath+"\\"+dir1+"\\"+dir2+"\\";File f = new File(path);if(!f.exists()){f.mkdirs();}return path+uuidName;}private String refactorFileName(String fileName) {return UUID.randomUUID().toString()+"_"+fileName;}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doGet(request, response);}}