Use input file to realize preview without uploading server selection

$("input:file").change(function(){
	  var thisObj = this;
	  var reader = new FileReader();
	  reader.onload = function (e) {
		  var data = e.target.result;
		  //Load the image to get the real width and height of the image
		  var image = new Image();
		  image.onload=function(){
		      var width = image.width;
		      var height = image.height;
			  $("img.showImageImg").attr("src",reader.result);
		  };
	      image.src= data;
	 };
	 reader.readAsDataURL(this.files[0]);
  });

   reader.result gets the BASE64 section code

 A file upload server can be implemented by transmitting BASE64

 

/**
	 *
	 * @param base64Str
	 * @throws IOException
	 */
	public static void uploadBASE64(String base64Str) throws IOException{
		BASE64Decoder d = new BASE64Decoder();
		//data:image/gif;base64,R0lGODlhg.....
		//remove commas and strings before commas
        byte[] bs = d.decodeBuffer(base64Str);  
        FileOutputStream os = new FileOutputStream("xxxx/x.gif");  
        os.write(bs);  
        os.close();
	}