Three ways to write Node.js files _node.js

This article shares three ways of node.js writing, specific content and the following

1, flow through the pipeline to write files
The use of pipeline transmission of binary flow, can realize automatic management flow, writable flow does not have to be careful of the readable flow of the fast and crash, suitable for size file transfer (recommended)

var readstream = Fs.createreadstream (decodeuricomponent (root + filepath.pathname)); URL
 readstream.pipe (res) must be decoded;//Pipeline Transmission
 res.writehead (200,{
   ' content-type ': Conttype
 });

 Error handling
 readstream.on (' Error ', function () {
   res.writehead (404, ' Can not find this page ', {
     ' content-type ': ' Text/html '
   });
   Readstream.pause ();
   Res.end (' 404 Can not find this page ');
   Console.log (' Error in writing or reading ');
 });

2. Manually manage Stream writes
Manual management of the flow, suitable for size file processing

var readstream = Fs.createreadstream (decodeuricomponent (root + filepath.pathname));
 Res.writehead (200,{
   ' content-type ': Conttype
 });

 When the data is readable, the function is triggered, chunk the block
 readstream.on (' Data ', function (chunk) {
   res.write (chunk);}) as read
 ;

 Error handling
 readstream.on (' Error ', function () {
   res.writehead (404, ' Can not find this page ', {
     ' Content-type ': ' text/html '
   });
   Readstream.pause ();
   Res.end (' 404 Can not find this page ');
   Console.log (' Error in writing or reading ');
 });

 Data read
 Readstream.on (' End ', function () {
   res.end ();
 });

3, through a one-time read data write
Read all the contents of the file at once, suitable for small files (not recommended)

Fs.readfile (decodeuricomponent (root + filepath.pathname), function (err, data) {
   if (err) {
     res.writehead 404, ' Can not find this page ', {
       ' content-type ': ' text/html '
     });
     Res.write (' 404 Can not find this page ');

   } else {
     res.writehead (200,{
       ' content-type ': Conttype
     });
     Res.write (data);
   }
   Res.end ();
 });

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