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
File upload
web.xml里加上下面几行：
Upload am.demo.Upload Upload /fileupload
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 items = upload.parseRequest(request);// 得到所有的文件 Iterator 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( " 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( "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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