Limit upload size, upload and download files with cos five (63)

One limit upload size

1: Limit the total file size. If uploading 10 files, set the maximum total upload size to 100M.

void	setSizeMax(long sizeMax) Sets the maximum allowed size of a complete request, as opposed to setFileSizeMax(long) .

2: Set the size of each file, if each file size is set to 10M.

void	setFileSizeMax(long fileSizeMax) Sets the maximum allowed size of a single uploaded file, as opposed to getSizeMax() .

Two use Cos to implement file upload

Package cn.hx;import java.io.file;import java.io.ioexception;import java.io.printwriter;import Java.util.UUID; Import Javax.servlet.servletexception;import Javax.servlet.http.httpservlet;import Javax.servlet.http.httpservletrequest;import Javax.servlet.http.httpservletresponse;import Com.oreilly.servlet.multipartrequest;import Com.oreilly.servlet.multipart.defaultfilerenamepolicy;import Com.oreilly.servlet.multipart.FileRenamePolicy;/** * in the Cos in a class, * multipartrequest It is the wrapper class of request. */ Public classCosservlet extends HttpServlet { Public voidDoPost (httpservletrequest request, HttpServletResponse resp) throws Servletexception, IOException {//first step: Declaring the file's save directoryString Path= Getservletcontext (). Getrealpath ("/up"); //Step Two: File transfer//policy for declaring a file to be re-namedfilerenamepolicy Rename=NewDefaultfilerenamepolicy (); Multipartrequest req=NewMultipartrequest (Request,path,1024x768*1024x768* -,"UTF-8",Newmyrename ());//     //Step Three: Display the information,Resp.setcontenttype ("Text/html;charset=utf-8"); PrintWriter out=Resp.getwriter ();  out. Print ("file name 1:"+req.getoriginalfilename ("IMG1"));  out. Print ("<br/> new name:"+req.getfilesystemname ("IMG1"));  out. Print ("<br/> Type 1:"+req.getcontenttype ("IMG1"));  out. Print ("<br/> size 1:"+req.getfile ("IMG1"). Length ());  out. Print ("<br/> Description:"+req.getparameter ("DESC1")); if(Req.getcontenttype ("IMG1"). Contains ("image/")){            out. Print (""+request.getcontextpath () +"/up/"+req.getfilesystemname ("IMG1")+"' ></img>"); }    }}classMyrename implements filerenamepolicy{ Publicfile Rename (file file) {String fileName=File.getname (); String Extname= Filename.substring (Filename.lastindexof (".")); String UUID= Uuid.randomuuid (). toString (). Replace ("-",""); String NewName= Uuid+extname;//abc.jpgfile=NewFile (File.getparent (), newName); returnfile; }}

Three Downloads

Can be either a get or post.

Public void DoPost (httpservletrequest req, HttpServletResponse resp)

throws Servletexception, IOException {

Req.setcharacterencoding ("UTF-8");

String name = Req.getparameter ("name");

First step: Set the type of response

Resp.setcontenttype ("Application/force-download");

Second Read file

String path = Getservletcontext (). Getrealpath ("/up/" +name);

InputStream in = new fileinputstream (path);

Setting the response header

URL encoding a file name

Name = Urlencoder. encode (Name, "UTF-8");

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

Resp.setcontentlength (In.available ());

Step three: Start file copy

OutputStream out = Resp.getoutputstream ();

byte [] B = new byte[1024];

int len = 0;

while ((Len=in.read (b))!=-1) {

Out.write (B,0,len);

}

Out.close ();

In.close ();

}

Limit upload size, upload and download files with cos five (63)