在节点js中上传图片 [英] Image upload in node js

问题描述

我创建了这样的表单，如何在后端节点中处理这个js

 < form method =postenctype =multipart / form-dataaction =/ file-upload> 
< input type =textname =username> 
< input type =passwordname =password> 
< input type =filename =thumbnail> 
< input type =submit> 
  

解决方案

使用这种方法上传

  app.post（'/ upload'，function（req，res）{
 
 //获取文件的临时位置
 var tmp_path = req.files.thumbnail.path; 
 //设置文件实际存在的位置 - 在这种情况下，位于images 目录
 target_path ='/ tmp /'+ req.files.thumbnail.name; 
 //将文件从临时位置移动到目标位置
 fs.rename（tmp_path，target_path ，函数（err）{
 if（err）throw err; 
 //删除临时文件，这样显式设置的临时上传目录不会被不需要的文件填充
 fs.unlink （tmp_path，function（）{
 if（err）throw err; 
 
}）; 
}）; 
}）; 
  

在此方法中显示路径时，

< pre $ fs.readFile（target_path，binary，function（error，file）{
if（error）{
res.writeHead（500，{Content （）;
res.end（）;
} else {

res.writeHead（200，{Content-Type：image / png}）;
res.write（file，binary）;

}
}）;


请参阅以获取更多详细信息

Im new to node js now i want to do image upload.so i downloaded express framework to handle the upload.Please help me how to handle that upload in server side.

i created form like this how to handle this in back end node js

  <form method="post" enctype="multipart/form-data" action="/file-upload">
<input type="text" name="username">
<input type="password" name="password">
<input type="file" name="thumbnail">
<input type="submit">

解决方案

Use this method for uploading

app.post('/upload', function(req, res) {

    // get the temporary location of the file
    var tmp_path = req.files.thumbnail.path;
    // set where the file should actually exists - in this case it is in the "images" directory
   target_path = '/tmp/' + req.files.thumbnail.name;
    // move the file from the temporary location to the intended location
    fs.rename(tmp_path, target_path, function(err) {
        if (err) throw err;
        // delete the temporary file, so that the explicitly set temporary upload dir does not get filled with unwanted files
        fs.unlink(tmp_path, function() {
            if (err) throw err;

        });
    });
});

While retriving show that path in this method

fs.readFile(target_path, "binary", function(error, file) {
    if(error) {
      res.writeHead(500, {"Content-Type": "text/plain"});
      res.write(error + "\n");
      res.end();
    } else {

      res.writeHead(200, {"Content-Type": "image/png"});
      res.write(file, "binary");

    }
 });

Refer nodejs expressjs upload images and display them for more details

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