Servlet set cache time and file download

Settings for cache time:

1  Public voiddoget (httpservletrequest request, httpservletresponse response)2             throwsservletexception, IOException {3 4Response.setcontenttype ("Text/html;charset=utf-8");5PrintWriter out =Response.getwriter ();6Response.setdateheader ("Expires", System.currenttimemillis () +60*60*1000);//cache time of one hour7Out.write ("Hello World");8}

Notifies the client of the download of the file, taking the picture as an example:

1      Public voiddoget (httpservletrequest request, httpservletresponse response)2             throwsservletexception, IOException {3Response.setcontenttype ("text/html");4ServletContext context=Getservletcontext ();5         6String Path=context.getrealpath ("/picture.jpg");7String filename=path.substring (path.lastindexof ("\ \") +1);8InputStream in=NewFileInputStream (path);9         Ten         //notifies the client file of the download Urlencoder.encode address the Chinese file name problem OneResponse.setheader ("Content-disposition", "attachment;filename=" +urlencoder.encode (filename, "Utf-8")); AResponse.setheader ("Content-type", "Application/octet-stream"); -          -OutputStream out=Response.getoutputstream (); the         intLength=-1; -         byte[]buffer=New byte[1024]; -          while(Length=in.read (buffer))!=-1){ -Out.write (buffer,0, length); +         } - in.close (); +}

Servlet set cache time and file download