Node.js写文件的三种方法

 2  var readStream = fs.createReadStream(decodeURIComponent(root + filepath.pathname)); // 必须解码url
 3  readStream.pipe(res); // 管道传输
 4  res.writeHead(200,{
 5      ‘Content-Type‘ : contType
 6  });
 7 
 8  // 出错处理
 9  readStream.on(‘error‘, function() {
10      res.writeHead(404,‘can not find this page‘,{
11          ‘Content-Type‘ : ‘text/html‘
12      });
13      readStream.pause();
14      res.end(‘404 can not find this page‘);
15      console.log(‘error in writing or reading ‘);
16  });

 1 var readStream = fs.createReadStream(decodeURIComponent(root + filepath.pathname));
 2  res.writeHead(200,{
 3      ‘Content-Type‘ : contType
 4  });
 5 
 6  // 当有数据可读时，触发该函数，chunk为所读取到的块
 7  readStream.on(‘data‘,function(chunk) {
 8      res.write(chunk);
 9  });
10 
11  // 出错时的处理
12  readStream.on(‘error‘, function() {
13      res.writeHead(404,‘can not find this page‘,{
14          ‘Content-Type‘ : ‘text/html‘
15      });
16      readStream.pause();
17      res.end(‘404 can not find this page‘);
18      console.log(‘error in writing or reading ‘);
19  });
20 
21  // 数据读取完毕
22  readStream.on(‘end‘,function() {
23      res.end();
24  });

 1 fs.readFile(decodeURIComponent(root + filepath.pathname), function(err, data) {
 2      if(err) {
 3          res.writeHead(404,‘can not find this page‘,{
 4              ‘Content-Type‘ : ‘text/html‘
 5          });
 6          res.write(‘404 can not find this page‘);
 7 
 8      }else {
 9          res.writeHead(200,{
10              ‘Content-Type‘ : contType
11          });
12          res.write(data);
13      }
14      res.end();
15  });