借鉴别人的代码,自己再总结记录一下:
后台:
package com.sitech.easkLog; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.util.*; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; /** * * @author administrator */ @SuppressWarnings("unchecked") public class UpLoad extends HttpServlet { /** */ private static final long serialVersionUID = 1L; protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=GBK"); String action = request.getParameter("action"); if("uploadFile".equals(action)){ this.uploadFile(request,response); //上传文件 } } public void uploadFile(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=GBK"); request.setCharacterEncoding("GBK"); HttpSession session=request.getSession(); session.setAttribute("progressBar",0); //定义指定上传进度的Session变量 String error = ""; int maxSize=50*1024*1024; //单个上传文件大小的上限 DiskFileItemFactory factory = new DiskFileItemFactory(); //基于磁盘文件项目创建一个工厂对象 ServletFileUpload upload = new ServletFileUpload(factory); //创建一个新的文件上传对象 try { List items = upload.parseRequest(request);// 解析上传请求 Iterator itr = items.iterator();// 枚举方法 while (itr.hasNext()) { FileItem item = (FileItem) itr.next(); //获取FileItem对象 if (!item.isFormField()) {// 判断是否为文件域 if (item.getName() != null && !item.getName().equals("")) {// 判断是否选择了文件 long upFileSize=item.getSize(); //上传文件的大小 String fileName=item.getName(); //获取文件名 //System.out.println("上传文件的大小:" + item.getSize()); if(upFileSize>maxSize){ error="您上传的文件太大,请选择不超过50M的文件"; break; } // 此时文件暂存在服务器的内存中 File tempFile = new File(fileName);// 构造临时对象 String uploadPath = this.getServletContext().getRealPath("/upload"); File file = new File(uploadPath,tempFile.getName()); // 获取根目录对应的真实物理路径 InputStream is=item.getInputStream(); int buffer=1024; //定义缓冲区的大小 int length=0; byte[] b=new byte[buffer]; double percent=0; FileOutputStream fos=new FileOutputStream(file); while((length=is.read(b))!=-1){ percent+=length/(double)upFileSize*100D; //计算上传文件的百分比 fos.write(b,0,length); //向文件输出流写读取的数据 session.setAttribute("progressBar",Math.round(percent)); //将上传百分比保存到Session中 } fos.close(); Thread.sleep(1000); //线程休眠1秒 } else { error="没有选择上传文件!"; } } } } catch (Exception e) { e.printStackTrace(); error = "上传文件出现错误:" + e.getMessage(); } if (!"".equals(error)) { request.setAttribute("error", error); request.getRequestDispatcher("error.jsp").forward(request, response); }else { request.setAttribute("result", "文件上传成功!"); request.getRequestDispatcher("upFile_deal.jsp").forward(request, response); } } @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } @Override public String getServletInfo() { return "Short description"; }// </editor-fold> }
上传jsp页面
<%@ page language="java" pageEncoding="UTF-8"%> <!DOCTYPE HTML> <html> <head> <title>文件上传</title> </head> <body> <form action="${pageContext.request.contextPath}/servlet/UploadHandleServlet" enctype="multipart/form-data" method="post"> 上传用户:<input type="text" name="username"><br/> 上传文件1:<input type="file" name="file1"><br/> 上传文件2:<input type="file" name="file2"><br/> <input type="submit" value="提交"> </form> </body> </html>
上传成功后:
<%@ page language="java" pageEncoding="UTF-8"%>
<!DOCTYPE HTML>
<html>
<head>
<title>消息提示</title>
</head>
<body>
${message}
</body>
</html>