Image和Base64 String之间的相互转换

Image to Base64 String



public string ImageToBase64(Image image,
System.Drawing.Imaging.ImageFormat format)
{
using (MemoryStream ms = new MemoryStream())
{
// Convert Image to byte[]
image.Save(ms, format);
byte[] imageBytes = ms.ToArray(); // Convert byte[] to Base64 String
string base64String = Convert.ToBase64String(imageBytes);
return base64String;
}
}





Base64 String to Image

public Image Base64ToImage(string base64String)
{
// Convert Base64 String to byte[]
byte[] imageBytes = Convert.FromBase64String(base64String);
MemoryStream ms = new MemoryStream(imageBytes, 0,
imageBytes.Length);

// Convert byte[] to Image
ms.Write(imageBytes, 0, imageBytes.Length);
Image image = Image.FromStream(ms, true);
return image;
}
Use sun.misc Classes for Base64 Image Conversion
import java.io.*;
import java.awt.*;
import java.awt.event.*;

class Base64Example extends Frame implements ActionListener{

Image IMG=null; //image1
Image IMGdecode=null; //image2-result
TextArea TA=new TextArea(); //printing the Base64 form

Button B=new Button("Decoder");

byte[] buffer_code=new byte[1024];
byte[] buffer_decode;

boolean bool=false;

//constructorul
public Base64Example(String titlu)
{
super(titlu);
}

void init()
{
Dimension dim=Toolkit.getDefaultToolkit().getScreenSize();
setSize(550,460);
setLocation(dim.width/2-275,dim.height/2-280);
setLayout(null);
setResizable(false);

TA.setSize(300,390);
TA.setLocation(10,60);
add(TA);

B.setSize(60,20);
B.setLocation(250,35);
B.addActionListener(this);
add(B);

Toolkit tk=Toolkit.getDefaultToolkit();
IMG=tk.getImage(".//java.jpg");

//load image1
MediaTracker mt=new MediaTracker(this);
mt.addImage(IMG,1);
try {mt.waitForAll();}
catch(InterruptedException e)
{
System.out.println(e.getMessage());
};


setVisible(true);

//encode
codeBase64(IMG);
}

private void codeBase64(Image i)
{
int cnt=0;
try{
InputStream is = new BufferedInputStream( new FileInputStream(".//java.jpg"));
while((cnt=is.read(buffer_code))!=-1)
{
String s = new sun.misc.BASE64Encoder().encode(buffer_code);
TA.append(s+"/n");
}
}catch(IOException e){System.out.println(e.getMessage());}
}

//decode
private void decodeBase64(String sb)
{
try{
buffer_decode=new sun.misc.BASE64Decoder().decodeBuffer(sb);
IMGdecode=Toolkit.getDefaultToolkit().createImage(buffer_decode);
bool=true;
repaint();
}catch(IOException e)
{System.out.println(e.getMessage());}
}

public void paint(Graphics g)
{
//drawing image1
g.drawImage(IMG,325,50,this);

//drawing same image but after decode
if(bool)g.drawImage(IMGdecode,325,240,this);

g.drawString("Before:",325,60);
g.drawString("After:",325,250);
g.drawString("Encode image:",10,55);
}

public void actionPerformed(ActionEvent e)
{
if(e.getActionCommand().equals("Decodare"))
{
//decode
decodeBase64(TA.getText());
}
}
}

public class Base64{
public static void main(String[] args){
Base64Example t=new Base64Example("Base64");
t.init();
}
}