java 2d 合成编辑后的图片

 

因为根据前端的flex合成的小图，服务器端也需要合成输出大图。所以用到了java2d。本来尝试用GraphicsMagick，那样会高效很多吧，但是GraphicsMagick的旋转图片旋转了之后会有白色的底色，不知怎么去除。那就暂时先用java2d，旋转、缩放、都可以对应前台的参数。代码如下：

 

import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import javax.imageio.ImageIO;
import com.sun.image.codec.jpeg.*;

public class TestMergeImage {
public static void main(String[] args) {
double scale = 0.8 ;
try {
BufferedImage bgImage = ImageIO.read( new FileInputStream( "c:\\bg.jpg" ) ) ;
Graphics2D graphics2d = bgImage.createGraphics() ;
BufferedImage drawImage = ImageIO.read(new FileInputStream( "c:\\src2.jpg" ) ) ;
AffineTransform affineTransform = new AffineTransform();
affineTransform.setToTranslation( 50, 80 ); //////x y
affineTransform.rotate(
  Math.toRadians( 90 ) ) ;/////rotate
affineTransform.scale( scale, scale ) ;////scale
graphics2d.drawImage(
drawImage, affineTransform, null
) ;
graphics2d.dispose() ;
FileOutputStream out = new FileOutputStream( "c:\\all.jpg" ) ;
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder( out ) ;
encoder.encode( bgImage ) ;
out.close() ;
} catch(Exception e) {
e.printStackTrace() ;
}
}
}