Web file upload --Base64 way

front end:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>简单的html5 File测试 for pic2base64</title>
<style>
</style>
<script>
    window.onload = function () {
        varINPUT = document.getElementById ( " fielinput " );
         var txshow = document.getElementById ( " txshow " );
         IF ( typeof (the FileReader) ===  ' undefined ' ) { 
            result.innerHTML =  " Sorry, your browser does not support FileReader, use modern browsers operation! " ; 
            input.setAttribute ( ' Disabled ' , ' Disabled ' ); 
        } the else {
            input.addEventListener ( ' Change ' , readFile, to false ); 
            txshow.onclick =  function () {input.click ();} 
        } 
    } 
    function readFile () {
         var File =  the this .files [ 0 ];
         // determine whether it is picture type 
        / * IF (/ image \ / \ W + / Test (file.type)!.) { 
            Alert ( "Photo select only"); 
            return to false; 
        } * / 
        var Reader =  new new the FileReader (); 
        reader.readAsDataURL (file); 
        reader.onload = function (e) { 
            txshow.src = this.result; 
            document.getElementById("data").innerText=this.result.substring(this.result.indexOf(',')+1); 
        }
 
    
    }
 
</script>
</head>
<body>
 
<input type="file" id="fielinput" />
<img id="txshow" style="width:100px;height:100px;"/>
<br/>解析之后的base64数据：<br/>
<p id="data"></p>
</body>
</html>

Backstage:

// BASE64 decoded file into File 
        public UapAttachs toolsBase64ToFile (Base64 String, String fileName) { 
            UapAttachs uapAttachs = null ;
             IF (! = Base64 null ! && base64.isEmpty ()) { 
                String FILEPATH; // file path 
                String FILENAME; // filename 
                String FileExt = ""; // file suffix 
                Long FILESIZE; // file size 
                String emcrypt; // encrypted file name
 //                 FILESIZE = (file.getSize () / 1048576);
                = FILESIZE (base64.length () - (base64.length () / 8L) * 2L) / 1048576 ;
                 / * limits the size of 20MB or less * / 
                IF (FILESIZE> 20 is ) {
                     return  null ; 
                } 
                / * Create attachment folder * / 
                emcrypt = String.valueOf (System.currentTimeMillis ()); 
                file Attachment = new new file ( "Attachment" );
                 IF (! {attachment.exists ()) 
                    attachment.mkdir (); 
                } 
                / * create a local file * /
                FILENAME = fileName!=null?fileName:"";                        
                if (FILENAME.indexOf(".") >= 0) {
                    FILEEXT = FILENAME.substring(FILENAME.lastIndexOf(".")+1,FILENAME.length());
                }
                File targetfile = new File(attachment.getAbsolutePath(),emcrypt+"_"+FILENAME);
                /* 解码base64到文件对象 */
                BufferedOutputStream bos = null;
                java.io.FileOutputStream fos = null;
                try {
                    byte[] bytes = Base64.getDecoder().decode(base64);                            
                    fos = new java.io.FileOutputStream(targetfile);
                    bos = new BufferedOutputStream(fos);
                    bos.write(bytes);
                } catch (Exception e) {
                    e.printStackTrace();
                } finally {
                    if (bos != null) {
                        try {
                            bos.close();
                        } The catch );(IOException E) { 
                            e.printStackTrace (); 
                        } 
                    } 
                    IF (fos =! Null ) {
                         the try { 
                            fos.close (); 
                        } the catch (IOException E) { 
                            e.printStackTrace (); 
                        } 
                    } 
                } 
                / * return file object information * / 
                FILEPATH = targetfile.getPath (). Replace ( "\\", "/" 
                uapAttachs = new new UapAttachs();
                if (targetfile.exists()) {
                    uapAttachs.setFilepath(FILEPATH);
                    uapAttachs.setFilename(FILENAME);
                    uapAttachs.setFileext(FILEEXT);
                    uapAttachs.setFilesize(FILESIZE);
                    uapAttachs.setAttachtype("");
                    uapAttachs.setCnname("");
                    uapAttachs.setObjvalue("");
                    uapAttachs.setObjid(3529L);
                }
            }
            return uapAttachs;
        }

Web file upload --Base64 way

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