Combined with SPRINGMVC, use Ajax upload base64 picture data _ Upload File

Source: Internet
Author: User

Note (other applications): Use the canvas canvas for the DOM elements required in HTML, draw, use Todataurl to convert to Base64 encoding upload picture


First, front-end:

<input type= "File" id= "MyImage" name= "MyImage"/>  
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<script type= "Text/javascript" > $ ("#myImage"). Bind (' Change ', function () {UploadFile ($ (this));

    });

        Directly obtain base64 data by onchange Q function uploadfile (file) {var f = file.files[0];

        var reader = new FileReader ();
            Reader.onload = function () {var data = E.target.result; if (Data.lastindexof (' data:base64 ')!=-1) {data = Data.replace (' data:base64 ', ' data:image/jpeg;base64 ')
            ); 
            else if (Data.lastindexof (' Data:, ')!=-1) {data = Data.replace (' Data:, ', ' data:image/jpeg;base64, ');
            } if (iscanvassupported ()) {}else{alert ("Your browser does not support");

        }

        };
        Reader.onerror = function () {Console.log ("Upload failed");
    } reader.readasdataurl (f); //ajax Asynchronous Upload function Ajaxuploadbase64file (base64data) {var url = window.location.protocol + '//' + Windo W.location.host + "/reGister/uploadbase64 "; $.ajax ({url:url, type: "Post", Data:{base64data:base64data}, DataType: "Jso 
                N ", success:function (data) {if (data.success = = True) {Console.log (" upload succeeded ");
                }else{console.log ("Upload failed");
            }, Error:function () {Console.log ("Upload failed");
    }
        }); 


    };
        Whether to support canvas function iscanvassupported () {var elem = document.createelement (' canvas '); Return!!
    (Elem.getcontext && elem.getcontext (' 2d '));

};   </script>
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Second, backstage:

    @RequestMapping (value= "/uploadbase64", Method=requestmethod.post) @ResponseBody public actionresult<map<s Tring,string>> base64upload (@RequestParam String base64data, httpservletrequest request, HttpServletResponse Response) {actionresult<map<string,string>> result = new Actionresult<map<string,string>&gt
        ;();
            try{logger.debug ("Upload file data:" +base64data);
            String Dataprix = "";

            String data = "";
            Logger.debug ("To judge the data"); if (Base64data = null | |
            "". Equals (Base64data)) {throw new Exception ("Upload failed, upload picture data is empty");
                }else{String [] D = base64data.split ("base64,");
                    if (d!= null && d.length = = 2) {Dataprix = d[0];
                data = d[1];
                }else{throw new Exception ("Upload failed, data not valid"); } logger.debug ("Parsing the data, getting the file name andStream data ");
            String suffix = ""; if ("DATA:IMAGE/JPEG;").
            Equalsignorecase (Dataprix)) {//DATA:IMAGE/JPEG;BASE64,BASE64 encoded JPEG picture data suffix = ". jpg"; else if ("Data:image/x-icon;").
            Equalsignorecase (Dataprix)) {//DATA:IMAGE/X-ICON;BASE64,BASE64 encoded icon image data suffix = ". ico"; else if ("data:image/gif;").
            Equalsignorecase (Dataprix)) {//DATA:IMAGE/GIF;BASE64,BASE64 encoded GIF image data suffix = ". gif"; else if ("data:image/png;").
            Equalsignorecase (Dataprix)) {//DATA:IMAGE/PNG;BASE64,BASE64 encoded PNG picture data suffix = ". png";
            }else{throw new Exception ("Upload image format is not valid");
            String tempfilename = getrandomfilename () + suffix;

            Logger.debug ("Generate File name:" +tempfilename);
            Because of the Base64decoder jar problem, use the toolkit provided by the Spring framework byte[] bs = base64utils.decodefromstring (data); try{//Using Apache-provided tool class operation Flow FileutilS.writebytearraytofile (New File (Global.getconfig (upload_file_paht), TempFileName), BS);
            }catch (Exception ee) {throw new Exception ("Upload failed, write file failed," +ee.getmessage ());   
            } map<string,string> Map =new hashmap<string,string> ();
            Map.put ("TempFileName", tempfilename);
            Result.setresultmessage ("Upload success");
            Result.setdata (map);
        Logger.debug ("Upload success");
            }catch (Exception e) {logger.debug ("Upload failed," +e.getmessage ());
            Result.setsuccess (FALSE);  
        Result.setresultmessage ("Upload failed," +e.getmessage ());
    return result; }
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Reference:
BASE64 encoding and Image interchange,
JAVA to convert base64 image data to local pictures,
How to convert a picture into a base64 in the background into a picture placed locally

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