Struts2之Servlet文件上传详解案例struts010

package com.almostman.servlet; 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.FileUploadException; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; public class UploadServlet extends HttpServlet{ @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { DiskFileItemFactory factory = new DiskFileItemFactory(); String path = req.getRealPath("/upload"); //设置临时文件存放路径 factory.setRepository(new File(path)); //文件溢出大小为1024*1024才直接写向磁盘，此处配置既是防止直接写向磁盘 factory.setSizeThreshold(1024 * 1024); ServletFileUpload upload = new ServletFileUpload(factory); try { List<FileItem> list = (List<FileItem>)upload.parseRequest(req); for (FileItem item : list) { String name = item.getFieldName(); if(item.isFormField()){ String value = item.getString(); req.setAttribute(name, value); }else{ String value = item.getName(); String fileName = value.substring(value.lastIndexOf("\\") + 1); req.setAttribute(name, fileName); item.write(new File(path, fileName)); } } } catch (Exception e) { e.printStackTrace(); } req.getRequestDispatcher("recvfile.jsp").forward(req, resp); } }