Verification code picture to string

Why?

Because the previous project, Android said only to deal with JSON, nothing else ... (later asked others, obviously can handle other ~ ~)

At that time, because of the progress, so directly cached the picture (embarrassed), and then send the image address.

After thinking about the next completely can be turned into a string sent past.

Here's how:

Verification Code Picture

 PublicBufferedImage GetImage ()throwsioexception{intwidth = 60; intHeight = 32; //Create the imageBufferedImage image =Newbufferedimage (width, height, bufferedimage.type_int_rgb); Graphics g=Image.getgraphics (); //set the background colorG.setcolor (NewColor (0xDCDCDC)); G.fillrect (0, 0, width, height); //Draw the BorderG.setcolor (Color.Black); G.drawrect (0, 0, width-1, height-1); //Create a random instance to generate the CodesRandom RDM =NewRandom (); String Hash1=integer.tohexstring (Rdm.nextint ()); //Make some confusion     for(inti = 0; I < 50; i++){        intx =rdm.nextint (width); inty =rdm.nextint (height); G.drawoval (x, Y,0, 0); }    //generate a random codeString capstr = hash1.substring (0, 4); G.setcolor (NewColor (0, 100, 0)); G.setfont (NewFont ("Candara", Font.Bold, 24)); g.DrawString (Capstr,8, 24);    G.dispose (); returnimage; }

Direct output in JSP

Tool methods for turning into strings

 Public Static byte[] Object2bytearray (Object object) {Bytearrayoutputstream Bytearrayoutputstream=NewBytearrayoutputstream (); ObjectOutputStream ObjectOutputStream=NULL; byte[] bytes =NULL; Try{ObjectOutputStream=NewObjectOutputStream (Bytearrayoutputstream);        Objectoutputstream.writeobject (object); Bytes=Bytearrayoutputstream.tobytearray ();        Bytearrayoutputstream.close ();        Objectoutputstream.close (); returnbytes; } Catch(IOException e) {e.printstacktrace (); }    return NULL;}

Test method

@Test  Public void throws ioexception{    byte[] bytes = object2bytearray (getImage ());     = Base64.getencoder (). encodetostring (bytes);    System.out.println (str);}

But, does not work!!! Because BufferedImage does not implement a serialized interface, it's a great embarrassment.

Solutions

/*** This class, purely for implementation of the serialization interface! */ Public class  mybufferedimage extendsBufferedImageImplements  Serializable { PublicMybufferedimage (intWidthintHeightintImageType) {        Super(width, height, imageType); }     PublicMybufferedimage (intWidthintHeightintImageType, IndexColorModel cm) {        Super(width, height, imageType, cm); }     PublicMybufferedimage (ColorModel cm, writableraster raster,BooleanIsrasterpremultiplied, hashtable<?,? >properties) {        Super(cm, Raster, israsterpremultiplied, properties); }}

And then

 Public  mybufferedimage GetImage ()throwsioexception{intwidth = 60; intHeight = 32; //Create the image     mybufferedimage Image =New mybufferedimage(width, height, bufferedimage.type_int_rgb); Graphics g=Image.getgraphics (); //set the background colorG.setcolor (NewColor (0xDCDCDC)); G.fillrect (0, 0, width, height); //Draw the BorderG.setcolor (Color.Black); G.drawrect (0, 0, width-1, height-1); //Create a random instance to generate the CodesRandom RDM =NewRandom (); String Hash1=integer.tohexstring (Rdm.nextint ()); //Make some confusion     for(inti = 0; I < 50; i++){        intx =rdm.nextint (width); inty =rdm.nextint (height); G.drawoval (x, Y,0, 0); }    //generate a random codeString capstr = hash1.substring (0, 4); G.setcolor (NewColor (0, 100, 0)); G.setfont (NewFont ("Candara", Font.Bold, 24)); g.DrawString (Capstr,8, 24);    G.dispose (); returnimage;}

Now it's OK to run the test again.

Verification code picture to string