jsp中文件下载的实现_JAVA_编程开发_程序员俱乐部

<%@ page import="java.util.*"%>
<%@ page import="java.io.File"%>
<%@ page import="org.apache.commons.fileupload.FileItem"%>
<%@ page import="org.apache.commons.fileupload.FileUploadBase"%>
<%@ page import="org.apache.commons.fileupload.FileUploadException"%>
<%@ page import="org.apache.commons.fileupload.disk.DiskFileItemFactory"%>
<%@ page import="org.apache.commons.fileupload.servlet.ServletFileUpload"%>
<%@ page import="com.khnt.cdsp.xzxk.Import"%>
<%@ page import="com.khnt.pub.MemsUser" %>
<%@ page import="com.khnt.frame.foundation.user.User" %>
<%@ page contentType="text/html;charset=UTF-8"%>
<%
?String resultMsg = "";
?String filePath = "";
?MemsUser user = (MemsUser) session.getAttribute(User.NAME);
?String aCode = user.getAreacode();
?String paths = request.getParameter("path");
?String path = pageContext.getServletContext().getRealPath("/") + "files/" + paths + "/";
?
?try
?{
??????? // 1. 上传文件
??????? DiskFileItemFactory factory = new DiskFileItemFactory();
??????? factory.setSizeThreshold(4*1024);
??????? ServletFileUpload upload = new ServletFileUpload(factory);
??????? upload.setSizeMax(1000*1024*1024);
??????? List itemList = null;
??????? try {
?????????? itemList = upload.parseRequest(request);
??????? }catch (FileUploadBase.SizeLimitExceededException e){??
?????????? // 请求数据的size超出了规定的大小.
?????????? e.printStackTrace();
?????????? response.getWriter().print("{success:false,errors:'请求数据的size超出了规定的大小'}");
?????????? return;
??????? }catch (FileUploadBase.InvalidContentTypeException e){??
???? // 无效的请求类型,即请求类型enctype != "multipart/form-data"??
?????????? response.getWriter().print("{success:false,errors:'请求类型enctype != multipart/form-data'}");
?????????? return;
??????? }catch (FileUploadException e){??
??????? // 如果都不是以上子异常,则抛出此总的异常,出现此异常原因无法说明.?
?????????? response.getWriter().print("{success:false,errors:'上传过程异常，导致其原因可能是网速过慢或者其它原因'}");
?????????? return;
??????? }
??
??????? if(itemList != null){
?????????? Iterator it = itemList.iterator();
?????????? while(it.hasNext())
?????????? {
???????????? FileItem item =(FileItem) it.next();
???????????? if(!item.isFormField())
???????????? {
????????????????? String totalName = item.getName();
????????????????? String name = "temp";
????????????????? if(totalName != ""){
???????????????????? int index = totalName.lastIndexOf("\\");
???????????????????? name = totalName.substring(index+1);
???????????????????? //System.out.println(name);
????????????????? }else{
???????????????????? name = "temp";
????????????????? }
????????????????? try {
???????????????????? filePath = path + name;
???????????????????? //System.out.println("-------------------" + path +name);
???????????????????? item.write(new File(filePath));
????????????????? } catch (Exception e) {
???????????????????? e.printStackTrace();
???????????????????? response.getWriter().print("{success:false,errors:'写入磁盘错误'}");
???????????????????? return;
???????????????? }
???????????? }
??????????? }
?????????? }
?????????? else{
???????????? response.getWriter().print("{success:false,errors:'上传数据空'}");
???????????? return;
????????? }
?????????
??????? // 2. 导入数据(操作数据库)
??resultMsg = Import.impExcel(filePath,aCode,user.getUserId());
??
??// 3. 返回结果
??out.print(resultMsg);
??//response.getWriter().print("{success:true,msg:'导入成功！'}");
?}
?catch (Exception e)
?{
??e.printStackTrace();
??out.print(resultMsg);
??//response.getWriter().print("{success:false,errors:'导入失败，请检查文件格式是否正确'}");
?}
%>