Request in Java-form form with file upload

Common system development always avoid showing pictures, save some files and other operations.

Behind these operations is the enctype= "Multipart/form-data" type of form that programmers are most familiar with.

Speaking of file type input, we often encounter problems:

The most common is the encoding format-Chinese garbled. The best way to solve Chinese garbled characters is to use the International Code of the UTF-8 format for all of our projects because it is a variable byte length encoding, which is more than enough for 2 bytes of Chinese. The other is to use string s2 = new String (S1.getbytes ("iso-8859-1"), "GBK"); Convert the server encoding (in Tomcat, for example) to GBK Chinese encoding.

The second is the question of request receiving parameters. First look at the segment code

//-----Code Snippets SPINGMVC uploading FilesMultiparthttpservletrequest mrequest = (multiparthttpservletrequest) request;//Request Cast Notemultipartfile File= Mrequest.getfile ("File"); if(!File.isempty ()) {String FileName=File.getoriginalfilename (); if(Stringutils.isnotblank (FileName)) {//because the last added control did not upload the appropriate contentString uuid =Uuid.randomuuid (). toString (); String FileType=filename.substring (fileName lastIndexOf (".")); //use characters to replace picture names to prevent garbledString tempname = uuid.substring (1, 10) +FileType; Uploadfilepath=fileroothelper.getorigimage ()+Tempname; File UploadFile=NewFile (BasePath+ Uploadfilepath);//Upload AddressFile Mir=NewFile (BasePath+ fileroothelper.getorigimage ());//file path                            if(!mir.exists ())                            {Mir.mkdirs (); } file.transferto (UploadFile);//Start uploading}

Executes multiparthttpservletrequest mrequest = (multiparthttpservletrequest) request, when the line code does not contain the file type of input , it will inevitably produce anomalies.

The request requests are SPRING-MVC configuration files, and the exception has been generated before the request method is entered. So, the problem comes??

How to avoid abnormal production?

A more intuitive approach is to:

<formAction= "Iconupload.action"Method= "POST"enctype= "Multipart/form-data">  <P>First Name:<inputtype= "text"name= "FName" /></P>  <P>Last Name:<inputtype= "text"name= "LName" /></P>  <P>Icon<inputtype= "File"name= "Ficon"/></P>          <inputtype= "Submit"value= "Submit" /></form>

<input type= "file" name = "Ficon"/> not selected by background file.isempty () , rather than in front of the judgment.

There is also a way to do the front-end judgment or not, the back end again to determine whether there are files flow, respectively, write 2 kinds of processing methods. The specific code is not posted, and the individual did not find the way to implement code-_-!

Personal sentiment:

Each person's thinking mode is not the same, the problem-solving mentality will be different.

But after all, it revolves around ' problem solving ' and is good at learning other people's thinking patterns and making up for their disdain. This will solve the problem quickly and efficiently. As the saying goes: Not to do, only unexpected.

To accept others ' opinions and understand others is not only helpful to their growth, but also the embodiment of personal accomplishment and value. Multi-thinking is an indispensable treasure in everyone's life!!

Request in Java-form form with file upload