JSP servlet实现文件上传下载和删除

时间：2025-07-05 08:00:01 编辑：袖梨来源：一聚教程网

这篇文章主要为大家详细介绍了JSP servlet实现文件上传下载和删除，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Android九宫格图片展示的具体代码，供大家参考，具体内容如下

由于存储空间，对一般用户而言，就是用来操作存储文件的，所以这两天，特意看了一下windows下用servlet实现文件上传、下载和删除，下面是详细代码说明

上传：

用的是commons-fileupload-1.2.2.jar和commons-io-2.0.1.jar组件，可以去apache官网上去下载，然后放到WebRoot/WEB-INF/lib目录下

upload.html

 <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=GBK"> <title>File upload</title> </head> <body> <!-- action="fileupload"对应web.xml中<servlet-mapping>中<url-pattern>的设置.--> <!-- 必须是multipart的表单数据,才能完整的传递文件数据 --> <form name="myform" action="fileupload" method="post" enctype="multipart/form-data"> File:<br> <input type="file" name="myfile"><br> <br> <input type="submit" name="submit" value="Commit"> </form> </body> </html>

web.xml里加上下面几行：

<servlet><servlet-name>Upload</servlet-name><servlet-class>am.demo.Upload</servlet-class></servlet><servlet-mapping><servlet-name>Upload</servlet-name><url-pattern>/fileupload</url-pattern></servlet-mapping>

src目录下新建文件Upload.java：

package am.demo;import java.io.File; import java.io.IOException; 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.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload;@SuppressWarnings("serial") public class Upload extends HttpServlet { private String uploadPath = "d://temp"; // 上传文件的目录@SuppressWarnings("unchecked") public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { try { // Create a factory for disk-based file items DiskFileItemFactory factory = new DiskFileItemFactory(); // Create a new file upload handler ServletFileUpload upload = new ServletFileUpload(factory); List<FileItem> items = upload.parseRequest(request);// 得到所有的文件 Iterator<FileItem> i = items.iterator(); while (i.hasNext()) { FileItem fi = (FileItem) i.next(); String fileName = fi.getName(); if (fileName != null) { File fullFile = new File(fi.getName()); File savedFile = new File(uploadPath, fullFile.getName()); fi.write(savedFile); } }response.setContentType("text/html;charset=GBK");response.getWriter().print( "<mce:script language='javascript'><!-- alert('上传成功');window.location.href='index.jsp'; // --></mce:script>"); } catch (Exception e) { // 可以跳转出错页面 e.printStackTrace(); } }public void init() throws ServletException { File uploadFile = new File(uploadPath); if (!uploadFile.exists()) { uploadFile.mkdirs(); } } }

再看下载Downlaod.java:

package am.demo;import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.OutputStream;import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;@SuppressWarnings("serial") public class Download extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { String aFileName = new String(request.getParameter("name").getBytes( "iso8859-1"), "gbk");File fileLoad = new File("d:/temp", aFileName);FileInputStream in = null; // 输入流 OutputStream out = response.getOutputStream(); byte b[] = new byte[1024];try { response.setContentType("application/x-msdownload;");response.setHeader("Content-disposition", "attachment; filename=" + new String(aFileName.getBytes("GBK"), "ISO-8859-1"));// download the file. in = new FileInputStream(fileLoad); int n = 0; while ((n = in.read(b)) != -1) { out.write(b, 0, n); }} catch (Throwable e) { e.printStackTrace(); } finally { try { in.close(); out.close(); } catch (Throwable e) { e.printStackTrace(); } } }public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { doGet(request, response); }}

删除Delete.java:

package am.demo;import java.io.File; import java.io.FileNotFoundException; import java.io.IOException;import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;@SuppressWarnings("serial") public class Delete extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response) throws FileNotFoundException, IOException {String aFileName = new String(request.getParameter("name").getBytes( "iso8859-1"), "gbk");File file = new File("d:/temp", aFileName);response.setContentType("text/html;charset=GBK");if (!file.isDirectory()) { file.delete(); response.getWriter().print( "<mce:script language='javascript'><!-- alert('删除成功');window.location.href='index.jsp'; // --></mce:script>"); } else {}}public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { doGet(request, response); } }

因为ubuntu server是黑屏，本人用的是ubuntu server10.04，不方便用浏览器来查看文件，因为没有图形界面，也不方便调试，所以可以先在windows上测试通过，然后把相应文件拷到ubuntu server中的tomcat相应目录下，可以通过samba来传文件，但遇到一个问题，就是中文乱码的问题，因为在开始安装时，选的是英文，后面用网上的一些办法，还是没有解决中文乱码的问题，有知道的大侠，还烦请转告。

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