Servlet最古老的上传代码 

  1 package cn.servlet;
  2 
  3 import java.io.File;
  4 import java.io.IOException;
  5 import java.util.List;
  6 
  7 import javax.servlet.ServletException;
  8 import javax.servlet.http.HttpServlet;
  9 import javax.servlet.http.HttpServletRequest;
 10 import javax.servlet.http.HttpServletResponse;
 11 
 12 import org.apache.commons.fileupload.FileItem;
 13 import org.apache.commons.fileupload.FileItemFactory;
 14 import org.apache.commons.fileupload.FileUploadException;
 15 import org.apache.commons.fileupload.disk.DiskFileItemFactory;
 16 import org.apache.commons.fileupload.servlet.ServletFileUpload;
 17 
 18 import cn.bean.User;
 19 
 20 public class RegisterServlet extends HttpServlet {
 21 
 22     /**
 23      * 
 24      */
 25     private static final long serialVersionUID = 1L;
 26 
 27     public void doGet(HttpServletRequest request, HttpServletResponse response)
 28             throws ServletException, IOException {
 29 
 30         this.doPost(request, response);
 31 
 32     }
 33 
 34     public void doPost(HttpServletRequest request, HttpServletResponse response)
 35             throws ServletException, IOException {
 36             User user = new User(); 
 37             request.setCharacterEncoding("utf-8");
 38             boolean isMultipart = ServletFileUpload.isMultipartContent(request);
 39             if(isMultipart){
 40                 //创建FileItemFactory工厂对象，
 41                 FileItemFactory factory  = new DiskFileItemFactory();
 42                 //获得ServletFileUpload对象
 43                 ServletFileUpload upload = new ServletFileUpload(factory);
 44                 try {
 45                     //解析request中的请求，parseRequest方法是ServletFileUpload类的重要方法，
 46                     //通过对http解析request获取到数据
 47                     @SuppressWarnings("unchecked")
 48                     List<FileItem> list = upload.parseRequest(request);
 49                     boolean flag = false;
 50                         if(list!=null){
 51                             for(FileItem fi:list){
 52                                 //isFormField方法判断FileItem类对象封装的数据是否为一个普通文本表单字段，
 53                                 //如果是普通表单字段返回一个true，如果是二进制文件表单，返回false
 54                                 if(fi.isFormField()){
 55                                     if("username".equals(fi.getFieldName())){
 56                                         user.setUsername(fi.getString("utf-8"));
 57                                     }
 58                                     if("password".equals(fi.getFieldName())){
 59                                         user.setPassword(fi.getString("utf-8"));
 60                                     }
 61                                 }
 62                                 else
 63                                 {
 64                                     //获得上文件
 65                                     //获取到文件的真实路径
 66                                     user.setPath("/upload/"+fi.getName());
 67                                     String path = request.getSession().getServletContext().getRealPath("/upload");
 68                                     System.out.println(path);
 69                                     //创建文件夹
 70                                     File parentPath = new File(path);
 71                                     if(!parentPath.exists()){
 72                                         parentPath.mkdirs();
 73                                     }
 74                                     String fiName = fi.getName();
 75                                     File newFile = new File(path,fiName);
 76                                     try 
 77                                     {
 78                                         fi.write(newFile);
 79                                         flag=true;
 80                                     } 
 81                                     catch (Exception e) 
 82                                     {
 83                                         System.out.println(e.getMessage());
 84                                     }
 85                                 }
 86                             }
 87                         }else{
 88                             System.out.println("集合中没有数据");
 89                         }
 90                     if(flag){
 91                         System.out.println("如果上传文件成功，数据添加到数据库");
 92                     }
 93                 } catch (FileUploadException e) {
 94                     // TODO Auto-generated catch block
 95                     e.printStackTrace();
 96                 }
 97                 response.setCharacterEncoding("utf-8");
 98             }
 99     }
100 
101 }
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posted @ 2018-08-21 16:19  Kusion_Lee  阅读(179)  评论(0)    收藏  举报