上传文件

1.

上传页

<div class="width100" style="margin-bottom: 6px;"><div align="right" class="text-left">图片：</div><div class="text-right1"><iframe src="fileupload.action?inputname=s_picture"name="fileimg" id="fileimg" scrolling="no" width="300"height="30" frameborder="0"></iframe><input type="hidden" name="bannerInfo.s_banner_picture"id="s_picture" value="${bannerInfo.s_banner_picture}" /><span style="color: red;" id="s_picture1s"></span></div><div class="red" id="s_pictureTip"style="width: 300px; float: left;">*</div></div>

2.iframe引用页

    <form id="form" action="${ctx}/FileUploadServlet?inputname=${inputname}"  enctype="multipart/form-data" method="post">      <input type="file" id="s" name="s"/>      <input type="submit" value="上传"/>  </form>

3.FileUploadServlet

import java.io.File;import java.io.IOException;import java.io.PrintWriter;import java.util.Iterator;import java.util.List;import javax.servlet.ServletException;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.FileUploadException;import org.apache.commons.fileupload.FileUploadBase.SizeLimitExceededException;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;public class FileUploadServlet extends HttpServlet {/** *  */private static final long serialVersionUID = 1L;public FileUploadServlet() {super();}public void destroy() {super.destroy(); }public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doPost(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {String inputname=request.getParameter("inputname");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[] { "jpg", "jpeg", "gif", "png","bmp","tiff","pcx","tga","exif","fpx","svg","psd","cdr","pcd","dxf","ufo","eps","ai","raw"};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ServletFileUploadDiskFileItemFactory 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(this.getServletContext().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 = response.getWriter();// 从request得到 所有 上传域的列表List fileList = null;try {fileList = sfu.parseRequest(request);} catch (FileUploadException e) {// 处理文件尺寸过大异常if(e instanceof SizeLimitExceededException) {out.println("<script language='javascript'>history.back();parent.document.getElementById('"+inputname+"1s').innerHTML='上传文件应小于3M';</script>");return;}e.printStackTrace();}// 没有文件上传if (fileList == null || fileList.size() == 0) {out.println("<script language='javascript'>history.back();parent.document.getElementById('"+inputname+"1s').innerHTML='没有上传文件';</script>");return;}// 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("<script language='javascript'>history.back();parent.document.getElementById('"+inputname+"1s').innerHTML='没有上传文件';</script>");return;}// 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if("s_apk_path".equals(inputname)){if (!"apk".equals(t_ext)) {out.println("<script language='javascript'>history.back();parent.document.getElementById('"+inputname+"1s').innerHTML='上传文件类型有误';</script>");return;}}else{int allowFlag = 0;int allowedExtCount = allowedExt.length;for (; allowFlag < allowedExtCount; allowFlag++) {if (allowedExt[allowFlag].equals(t_ext))break;}if (allowFlag == allowedExtCount) {out.println("<script language='javascript'>history.back();parent.document.getElementById('"+inputname+"1s').innerHTML='上传文件类型有误';</script>");return;}}long now = System.currentTimeMillis();// 根据系统时间生成上传后保存的文件名String prefix ="";if(inputname=="s_tel_image" || inputname.equals("s_tel_image")){File file=new File(this.getServletContext().getRealPath("/") + "ImagesUploaded/1.jpg");boolean b= file.delete();System.out.println(b);prefix="1";t_ext="jpg";}else if(inputname=="s_logo_image" || inputname.equals("s_logo_image")){File file=new File(this.getServletContext().getRealPath("/") + "ImagesUploaded/0.jpg");boolean b= file.delete();System.out.println(b);prefix="0";t_ext="jpg";}else{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String u_name =null;if(t_ext!="apk" && !"apk".equals(t_ext)){    u_name = this.getServletContext().getRealPath("/") + "ImagesUploaded/"    + prefix + "." + t_ext;}else{u_name = this.getServletContext().getRealPath("/") + "Apk/"    + prefix + "." + t_ext;}try {// 保存文件fileItem.write(new File(u_name));String projectPath = "";projectPath = request.getContextPath();if(t_ext!="apk" && !"apk".equals(t_ext)){out.println("<script language='javascript'>parent.document.getElementById('"+inputname+"').value='"+prefix+"." + t_ext+"';" +"parent.document.getElementById('"+inputname+"1').src='"+projectPath+"/ImagesUploaded/"+prefix+"." + t_ext+"';" +"parent.document.getElementById('"+inputname+"1s').innerHTML='上传成功';history.back();</script>");}else{out.println("<script language='javascript'>parent.document.getElementById('"+inputname+"').value='Apk/"+prefix+"." + t_ext+"';history.back();parent.document.getElementById('"+inputname+"1s').innerHTML='上传成功';</script>");}} catch (Exception e) {e.printStackTrace();}}}public void init() throws ServletException {// Put your code here}}