内容简介:这篇文章主要为大家详细介绍了jsp+servlet实现文件上传与下载功能,具有一定的参考价值,感兴趣的小伙伴们可以参考一下
本文实例为大家分享了jsp servlet实现文件上传与下载的具体代码,供大家参考,具体内容如下
上传:
需要导入两个包:commons-fileupload-1.2.1.jar,commons-io-1.4.jar
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 org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; /** * 上传附件 * @author new * */ public class UploadAnnexServlet extends HttpServlet { private static String path = ""; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } /* * post处理 * (non-Javadoc) * @see javax.servlet.http.HttpServlet#doPost(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse) */ public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { path = this.getServletContext().getRealPath("/upload"); try { DiskFileItemFactory factory = new DiskFileItemFactory(); ServletFileUpload up = new ServletFileUpload(factory); List<FileItem> ls = up.parseRequest(request); for (FileItem fileItem : ls) { if (fileItem.isFormField()) { String FieldName = fileItem.getFieldName(); //getName()返回的是文件名字 普通域没有文件 返回NULL // String Name = fileItem.getName(); String Content = fileItem.getString("gbk"); request.setAttribute(FieldName, Content); } else { String nm = fileItem.getName().substring( fileItem.getName().lastIndexOf("\\") + 1); File mkr = new File(path, nm); if (mkr.createNewFile()) { fileItem.write(mkr);//非常方便的方法 } request.setAttribute("result", "上传文件成功!"); } } } catch (Exception e) { e.printStackTrace(); request.setAttribute("result", "上传失败,请查找原因,重新再试!"); } request.getRequestDispatcher("/pages/admin/annex-manager.jsp").forward( request, response); } }
下载(i/o流)无需导包:
import java.io.IOException; import java.net.URLEncoder; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * 下载文件 * @author * */ public class DownloadFilesServlet extends HttpServlet { /** * */ private static final long serialVersionUID = 8594448765428224944L; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } /* * 处理请求 * (non-Javadoc) * @see javax.servlet.http.HttpServlet#doPost(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse) */ public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String name = request.getParameter("fileName"); System.out.print("dddddddddd:" + name); // web绝对路径 String path = request.getSession().getServletContext().getRealPath("/"); String savePath = path + "upload"; // 设置为下载application/x-download response.setContentType("application/x-download"); // 即将下载的文件在服务器上的绝对路径 String filenamedownload = savePath + "/" + name; // 下载文件时显示的文件保存名称 String filenamedisplay = name; // 中文编码转换 filenamedisplay = URLEncoder.encode(filenamedisplay, "UTF-8"); response.addHeader("Content-Disposition", "attachment;filename=" + filenamedisplay); try { java.io.OutputStream os = response.getOutputStream(); java.io.FileInputStream fis = new java.io.FileInputStream( filenamedownload); byte[] b = new byte[1024]; int i = 0; while ((i = fis.read(b)) > 0) { os.write(b, 0, i); } fis.close(); os.flush(); os.close(); } catch (Exception e) { } } }
以上所述就是小编给大家介绍的《jsp+servlet实现文件上传与下载功能》,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对 码农网 的支持!
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锦绣蓝图
[美] 沃德科 (Christina Wodtke)、[美] 戈夫拉 (Austin Govella) / 蔡芳 / 人民邮电出版社 / 2009-11-01 / 59.00
Web 2.0和社会化大趋势下,你的网站发展喜人,但是问题也接踵而来:信息变得越来越庞杂无序,业务流程愈加复杂,搜索和导航越来越难,用户对使用体验的要求也越来越高……怎么办? 作者非常通俗易懂地讲述了如何规划易用的网站及其背后的信息架构原理。首先介绍了建立信息架构的八项基本原则,然后重点强调了组织系统和元数据在信息架构中的作用,并指出设计搜索和导航需要考虑的问题和方法,另外还补充了当今热门的......一起来看看 《锦绣蓝图》 这本书的介绍吧!