使用servlet實現文件上傳，servlet實現文件上傳
1 package com.zhanghaobo.fileupload;
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.disk.DiskFileItemFactory;
14 import org.apache.commons.fileupload.servlet.ServletFileUpload;
15
16 public class UploadServlet extends HttpServlet {
17 @Override
18 protected void doPost(HttpServletRequest req, HttpServletResponse resp)
19 throws ServletException, IOException {
20 DiskFileItemFactory factory=new DiskFileItemFactory();
21
22 String realPath=req.getRealPath("/upload");
23
24 //物理緩存存放地
25 factory.setRepository(new File(realPath));
26
27 //設置內存存放大小
28 factory.setSizeThreshold(1024*1024);
29
30 ServletFileUpload upload=new ServletFileUpload(factory);
31 //FileItem 可以表示文件(file)也可以表示文本域（form item） 有一個isFormField方法判斷是否是表單
32 try{
33 List<FileItem> list=(List<FileItem>)upload.parseRequest(req);
34 for(FileItem item:list){
35 String name=item.getFieldName();
36 if(item.isFormField()){
37 String value=item.getString();
38 req.setAttribute(name, value);
39 }else{
40 String value=item.getName();
41 int start=value.lastIndexOf("\\");
42 String fileName=value.substring(start+1);
43 req.setAttribute(name, fileName);
44 //上傳文件存放地
45 item.write(new File(realPath,fileName));
46 }
47 }
48 }catch(Exception e){
49 e.printStackTrace();
50 }
51
52 req.getRequestDispatcher("showResult.jsp").forward(req, resp);
53 }
54 }
1 public class UploadServlet extends HttpServlet {
2 @Override
3 protected void doPost(HttpServletRequest req, HttpServletResponse resp)
4 throws ServletException, IOException {
5 DiskFileItemFactory factory=new DiskFileItemFactory();
6
7 String realPath=req.getRealPath("/upload");
8
9 //物理緩存存放地
10 factory.setRepository(new File(realPath));
11
12 //設置內存存放大小
13 factory.setSizeThreshold(1024*1024);
14
15 ServletFileUpload upload=new ServletFileUpload(factory);
16 //FileItem 可以表示文件(file)也可以表示文本域（form item） 有一個isFormField方法判斷是否是表單
17 try{
18 List<FileItem> list=(List<FileItem>)upload.parseRequest(req);
19 for(FileItem item:list){
20 String name=item.getFieldName();
21 if(item.isFormField()){
22 String value=item.getString();
23 req.setAttribute(name, value);
24 }else{
25 String value=item.getName();
26 int start=value.lastIndexOf("\\");
27 String fileName=value.substring(start+1);
28 req.setAttribute(name, fileName);
29
30 //上傳文件存放地
31 // item.write(new File(realPath,fileName));
32
33 InputStream is=item.getInputStream();
34
35 long all=item.getSize();
36
37 OutputStream os=new FileOutputStream(new File(realPath,fileName));
38
39 byte[] buffer=new byte[400];
40
41 int length=0;
42 int l=0;
43 DecimalFormat df=new DecimalFormat("#.00");
44 while(-1!=(length=is.read(buffer))){
45 os.write(buffer,0,length);
46 l+=length;
47 System.out.println("總大小"+all+""+"進度："+(df.format((double)l/all*100))+"%"+"已經讀取的大小"+l);
48 }
49
50 is.close();
51 os.close();
52
53 }
54 }
55 }catch(Exception e){
56 e.printStackTrace();
57 }
58
59 req.getRequestDispatcher("showResult.jsp").forward(req, resp);
60 }
61 }
