node.js文件上传处理示例

时间:2020-05-15 cclehui 人气:0

直入主题，在Node.js web 开发基本框架的前提下，我们来做一个文件上传功能

上传的handler比较简单，网上都能找到

var url=require('url');
var exec=require('child_process').exec;
var querystring=require('querystring');

/********************************文件上传 第3方模块测试*************************/
function fileUploadForm(request,response){
 response.writeHead(200,{'Content-Type':'text/html'});
 var body = '<html>'+
  '<head>'+
  '<meta http-equiv="Content-Type" '+
  'content="text/html; charset=UTF-8" />'+
  '</head>'+
  '<body>'+
  '<form action="/fileuploadaction" method="post" enctype="multipart/form-data">'+
  '<input name="name" type="text" />'+
  '<input name="upload" type="file" />'+
  '<input type="submit" value="Upload" />'+
  '</form>'+
  '</body>'+
  '</html>';
 response.write(body);
 response.end();
}

<span style="color: rgb(255, 0, 0);">function fileUploadAction(request,response){
 var fs=require('fs');
 var formidable=require('formidable');
 var baseUploadPath="./media/upload/";
 var form=new formidable.IncomingForm();
 form.uploadDir='./var/tmp';
 form.parse(request,function(error,fields,files){
  if(!error){
   console.log(fields);
   var desUploadName=baseUploadPath+files.upload.name;
   fs.renameSync(files.upload.path, desUploadName);
   response.writeHead(200,{'Content-Type':'text/html'});//值得注意的是这里的response.writeHead()函数内容要写在form.parse()的callback中要不不会显示
   response.write('received image:</br>');
   response.write('<img src="/showuploadimage?name='+files.upload.name+'" />');
   response.end();
  }
 });
}</span>

function showUploadImage(request,response){
 var fs=require('fs');
 var imageName=querystring.parse(url.parse(request.url).query);
 var baseUploadPath="./media/upload/";
 fs.readFile(baseUploadPath+imageName.name, "binary", function(error, file) {
  if(error) {
   response.writeHead(500, {"Content-Type": "text/plain"});
   response.write(error + "\n");
   response.end();
  } else {
   response.writeHead(200, {"Content-Type": "image/png"});
   response.write(file, "binary");
   response.end();
  }
 });
}
exports.fileuploadform=fileUploadForm;
exports.fileuploadaction=fileUploadAction;
exports.showuploadimage=showUploadImage;

同时在index.js中添加

handle['/fileuploadform']=handlers.fileuploadform; 
handle['/fileuploadaction']=handlers.fileuploadaction; 
handle['/showuploadimage']=handlers.showuploadimage;

有一点需要注意的是，在有需要处理文件上传的时候，不能在server中添加

request.setEncoding('utf8');//设置这个很可能导致上传失败，这是formidable模块的一个bug吧

和

request.addListener("data",function(tempPostData){ 
   postData+=tempPostData; 
  }); 
  request.addListener("end",function(){ 
   route(request,response,postData,handle); 
  });

加载全部内容