JSP Servlet学习笔记——使用fileupload上传文件
关键代码如下：
index.jsp
package com.accp.fileupload.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.FileUploadBase.FileSizeLimitExceededException;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;public class FileUploadServlet extends HttpServlet {private static final long serialVersionUID = 2827297299439162553L;public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {//使用同一种处理方法doPost(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("UTF-8");response.setContentType("text/html; charset=UTF-8");//保存路径String savePath = getServletContext().getRealPath("/upload");File saveDir = new File(savePath);// 如果目录不存在，就创建目录if(!saveDir.exists()){saveDir.mkdir();}// 创建文件上传核心类DiskFileItemFactory factory = new DiskFileItemFactory();ServletFileUpload sfu = new ServletFileUpload(factory);//设置编码sfu.setHeaderEncoding("UTF-8");// 设置上传的单个文件的最大字节数为2Msfu.setFileSizeMax(1024*1024*2);//设置整个表单的最大字节数为10Msfu.setSizeMax(1024*1024*10);try{// 处理表单请求List<FileItem> itemList = sfu.parseRequest(request);for (FileItem fileItem : itemList) {// 对应表单中的控件的nameString fieldName = fileItem.getFieldName();System.out.println("控件名称：" + fieldName);// 如果是普通表单控件if(fileItem.isFormField()){String value = fileItem.getString();//重新编码,解决乱码value = new String(value.getBytes("ISO-8859-1"),"UTF-8");System.out.println("普通内容：" + fieldName + "=" + value);// 上传文件}else{// 获得文件大小Long size = fileItem.getSize();// 获得文件名String fileName = fileItem.getName();System.out.println("文件名："+fileName+"\t大小：" + size + "byte");//设置不允许上传的文件格式if(fileName.endsWith(".exe")){request.setAttribute("msg", "不允许上传的类型！");}else{//将文件保存到指定的路径File file = new File(savePath,fileName);fileItem.write(file);request.setAttribute("msg", "上传成功！");}}}}catch(FileSizeLimitExceededException e){request.setAttribute("msg", "文件太大");}catch(FileUploadException e){e.printStackTrace();}catch(Exception e){e.printStackTrace();}//上传完毕后 转发到首页request.getRequestDispatcher("/index.jsp").forward(request, response);}}