Servlet文件上传代码

 

package org.accp.ch12.web;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Calendar;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.jspsmart.upload.File;
import com.jspsmart.upload.SmartUpload;

public class UploadServlet extends HttpServlet {

 /**
  * Constructor of the object.
  */
 public UploadServlet() {
  super();
 }

 /**
  * Destruction of the servlet. <br>
  */
 public void destroy() {
  super.destroy(); // Just puts "destroy" string in log
  // Put your code here
 }

 /**
  * The doPost method of the servlet. <br>
  *
  * This method is called when a form has its tag value method equals to post.
  *
  * @param request the request send by the client to the server
  * @param response the response send by the server to the client
  * @throws ServletException if an error occurred
  * @throws IOException if an error occurred
  */
 public void doPost(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  //新建一个SmartUpload对象
  SmartUpload su = new SmartUpload();

  //上传初始化
  su.initialize(getServletConfig(),request,response);

  // 设定上传限制
  //1.限制每个上传文件的最大长度。
  su.setMaxFileSize(10000000);

  //2.限制总上传数据的长度。
  su.setTotalMaxFileSize(20000000);

  //3.设定允许上传的文件（通过扩展名限制）,仅允许doc,txt文件。
  su.setAllowedFilesList("doc,txt,jpg,rar,mid,waw,mp3,gif");
  
  //4.设定禁止上传的文件（通过扩展名限制）,禁止上传带有exe,bat,jsp,htm,html扩展名的文件和没有扩展名的文件。
  try {
   su.setDeniedFilesList("exe,bat,jsp,htm,html");

   //上传文件[取得上传的文件数据]
   su.upload();
   
   //取表单元素的文本信息
   //su.getRequest().getParameter("desc");
   System.out.println("<p style='color:orange;'>描述信息:"+su.getRequest().getParameter("desc")+"</p>");
   
   //将上传文件保存到指定目录
   //动态获得服务器项目的路径[文件上传后的保存路径]
   String path = getServletContext().getRealPath("/")+"\\userfiles";
   java.io.File dir = new java.io.File(path);
   if (!dir.exists())//如果目录不存在则创建
    dir.mkdirs();
   
   for(int i=0; i< su.getFiles().getCount(); i++){
    File upfile = su.getFiles().getFile(i);//得到当前上传的这份文件
    
    Calendar cal = Calendar.getInstance();
    String filepath = path+"\\"+cal.get(Calendar.YEAR)+"_"+
           cal.get(Calendar.MONTH)+"_"+
           cal.get(Calendar.DATE)+"_"+
           cal.get(Calendar.HOUR)+"_"+
           cal.get(Calendar.MINUTE)+"_"+
           cal.get(Calendar.SECOND)+"_"+
           cal.get(Calendar.MILLISECOND)+"."+
           upfile.getFileExt();
    
    //su.save(path+"\\"+filepath,SmartUpload.SAVE_PHYSICAL);//将文件保存到目录但是不改变文件名[使用物理路径]
    upfile.saveAs(filepath);//使用File类自身的方法完成保存                                                                          
   }
   

  } catch (Exception e) {
   e.printStackTrace(); 
  }   
 }

 /**
  * Initialization of the servlet. <br>
  *
  * @throws ServletException if an error occurs
  */
 public void init() throws ServletException {
  // Put your code here
 }

}