Java upload attachments, bulk download attachments (i)

Upload attachment code: with Commons-fileupload-1.2.jar

Package com.str;

Import Java.io.BufferedInputStream;
Import Java.io.File;
Import Java.io.FileInputStream;
Import Java.io.FileOutputStream;
Import java.io.IOException;
Import Java.io.InputStream;
Import Java.io.InputStreamReader;
Import Java.io.OutputStream;
Import Java.util.Iterator;
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.disk.DiskFileItemFactory;
Import Org.apache.commons.fileupload.servlet.ServletFileUpload;

public class Uploadservlet extends HttpServlet {

@Override
protected void DoPost (HttpServletRequest req, HttpServletResponse resp)
Throws Servletexception, IOException {
Doget (req, resp);
}


@Override
protected void Doget (HttpServletRequest req, HttpServletResponse resp)
Throws Servletexception, IOException {

HttpServletRequest request = (httpservletrequest) req;
HttpServletResponse response = (httpservletresponse) resp;

/* Response.setcontenttype ("text/html;charset=gb2312");
Response.setcharacterencoding ("Utf-8"); */

OutputStream outputstream = null;
InputStream inputstream = null;

Diskfileitemfactory factory = new Diskfileitemfactory ();
Servletfileupload fileUpload = new Servletfileupload (factory);

try {
List items = fileupload.parserequest (request);
for (Iterator Iterator = Items.iterator (); Iterator.hasnext ();) {
Fileitem name = (Fileitem) iterator.next ();
if (!name.isformfield ()) {
String fieldName = Name.getfieldname (); This is the name value.
String fileName = Name.getname (); This is the full path.
String lastfilename = "";

This sentence gets the original name of the source file, without making any modifications
String Oldnamepath = filename.substring (filename.lastindexof ("\ \") +1);

if (Filename.endswith (". docx") | | filename.endswith (". xls")) {

Lastfilename = Request.getrealpath ("/") + "\\upload\\" + oldnamepath;
OutputStream = new FileOutputStream (new File (Lastfilename));

InputStream = Name.getinputstream ();
Byte[] bs = new byte[1024];
int length = 0;
while (null! = InputStream && (length = Inputstream.read (BS))!=-1) {
Outputstream.write (BS);
}
}
Outputstream.flush ();
}
Save the Lastfilename to the database (this is not the way to write the LZ)}
}
} catch (Exception e) {
E.printstacktrace ();
}

}
}

Single download file, bulk download file code: With the help of Ant.jar package Zipoutputstream, ZipEntry

Package com.str;

Import Java.io.File;
Import Java.io.FileInputStream;
Import java.io.IOException;

Import javax.servlet.ServletException;
Import Javax.servlet.http.HttpServlet;
Import Javax.servlet.http.HttpServletRequest;
Import Javax.servlet.http.HttpServletResponse;

Import Org.apache.tools.zip.ZipEntry;
Import Org.apache.tools.zip.ZipOutputStream;

Public class loadservlet  extends HttpServlet {
 
  @Override
 /*protected void Doget ( HttpServletRequest req, HttpServletResponse resp)
   throws servletexception, IOException {
  
  string path = Getservletcontext (). Getrealpath ("/") + "\\upload";
  outputstream o = Resp.getoutputstream ();
  byte b[] = new byte[1024];
  
  //files in this place can be found dynamically from the database, and I'm dead here. To simply show the
  file fileload = new File (path, " Resolve type configuration. xls ");
  
  string filename = new String ("Resolve type configuration. xls". GetBytes ("GBK"), "iso8859-1");

SYSTEM.OUT.PRINTLN (filename);

I remember when I exported the data in Excel said that filename must not write Chinese, in fact, after the following:
string filename = new String ("Resolve type configuration. xls". GetBytes ("GBK"), "iso8859-1");
After conversion, whether the file is Chinese, English, will not appear garbled situation, I have verified

Resp.setheader ("Content-disposition", "attachment;filename=" + filename);

Long filelength = Fileload.length ();
String length = string.valueof (filelength);
Resp.setheader ("Content_length", Length);
FileInputStream in = new FileInputStream (fileload);
int n = 0;
while ((n = in.read (b))! =-1) {
O.write (b, 0, N);
}
}*/

The above is a single download attachment, here is the bulk compression download accessories
protected void Doget (HttpServletRequest req, HttpServletResponse resp)
Throws Servletexception, IOException {

String zipfilename = "Test.zip";

These files are all there, I'm dead, I can send names from the page.
String[] Filepatharray = {"1.jpg", "2.jpg", "3.xls", "Test. docx"};
String path = Getservletcontext (). Getrealpath ("/") + "\\image";

Resp.setcontenttype ("Application/x-msdownload"); Notifies the client of the MIME type of the file:
Resp.setheader ("Content-disposition", "attachment;filename=" + zipfilename);

Zipoutputstream Zos = new Zipoutputstream (Resp.getoutputstream ());

for (String Filepath:filepatharray) {
File File = new file (path + file.separator + FilePath);
Dozip (file, Zos);
}
Zos.close ();
}

File compression issues when processing bulk downloads
private void Dozip (file file, Zipoutputstream Zos) throws IOException {
if (file.exists ()) {
if (File.isfile ()) {
If it is a file, write to the zip stream
String fileName = File.getname ();

ZipEntry Zet = new ZipEntry (File.getname ());
Zos.putnextentry (Zet);
FileInputStream fis = new FileInputStream (file);
byte[] buffer = new byte[1024];
int r = 0;
while ((r = fis.read (buffer))! =-1) {
Zos.write (buffer, 0, R);
}
Zos.setencoding ("GBK"); This place is important.
Zos.flush ();
Fis.close ();
}else {
System.out.println ("Not a file, that will not be downloaded, because the front desk will do the processing, here is not step by step to verify!");
}
}
}

}

Java upload attachments, bulk download attachments (i)