nodeJs 初学案例摘要

在学习nodeJs的时候，照着文档做的，但是到最后的上传文件显示图片总是报错，

所用的fs.renameSync出错：Error: EXDEV, cross-device link not permitted，查了一下是因为上传的文件是传到C盘，要读取的文件在D盘；所以

fs.renameSync(files.upload.path, "/tmp/test.png");这一条就会报错；

解决方法是：

var readStream=fs.createReadStream(files.upload.path);
     console.log(files.upload.path)
     var writeStream=fs.createWriteStream("/tmp/test.jpg");
    readStream.pipe( writeStream );

将文件先复制到同一个盘，在来读取。

最终的代码：

function upload(response,request){

  var form = new formidable.IncomingForm();

   form.parse(request, function(error, fields, files) {
    var readStream=fs.createReadStream(files.upload.path);
    var writeStream=fs.createWriteStream("/tmp/test.png");
    readStream.pipe( writeStream );

    response.writeHead(200, {"Content-Type": "text/html"});
    response.write("received image:<br/>");
    response.write("<img src='/show' />");
    response.end();
  });
}

var readStream=fs.createReadStream(files.upload.path);     console.log(files.upload.path)     var writeStream=fs.createWriteStream("/tmp/test.jpg");     /*util.pump(readStream,writeStream,function(){     fs.unlinkSync(files.upload.path);     })*/    readStream.pipe( writeStream );