java实现两张图片的合并的例子

BufferedImage image= bim;//二维码
BufferedImage bg= ImageIO.read(路径);//获取北京图片
Graphics2D g=bg.createGraphics();
int width=image.getWidth(null) > bg.getWidth() * 5/10? (bg.getWidth() * 5/10) : image.getWidth(null);
int height=image.getHeight(null) > bg.getHeight() *5 /10? (bg.getHeight() * 5/10) : image.getWidth(null);
g.drawImage(image,(bg.getWidth()- width)/2,(bg.getHeight()-height)/2,width,height,null);
g.dispose();
bg.flush();
image.flush();
ImageIO.write(bg,"png", file);

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.Map;

import javax.imageio.ImageIO;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

public class MatrixToImageWriter {
 private static final int IMAGE_WIDTH = 100;
 private static final int IMAGE_HEIGHT = 100;
 private static final int IMAGE_HALF_WIDTH = IMAGE_WIDTH / 2;
 private static final int FRAME_WIDTH = 2;
 private static MultiFormatWriter mutiWriter = new MultiFormatWriter();

 public static void encode(String content, int width, int height,
   String srcImagePath, String destImagePath) {
  try {
   ImageIO.write(genBarcode(content, width, height, srcImagePath),
     "jpg", new File(destImagePath));
  } catch (IOException e) {
   e.printStackTrace();
  } catch (WriterException e) {
   e.printStackTrace();
  }
 }

 private static BufferedImage genBarcode(String content, int width,
   int height, String srcImagePath) throws WriterException,
   IOException {
  BufferedImage scaleImage = scale(srcImagePath, IMAGE_WIDTH,
    IMAGE_HEIGHT, true);
  int[][] srcPixels = new int[IMAGE_WIDTH][IMAGE_HEIGHT];
  for (int i = 0; i < scaleImage.getWidth(); i++) {
   for (int j = 0; j < scaleImage.getHeight(); j++) {
    srcPixels[i][j] = scaleImage.getRGB(i, j);
   }
  }
  Map hint = new HashMap();
  hint.put(EncodeHintType.CHARACTER_SET, "utf-8");
  hint.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
  //  生成二维码
  BitMatrix matrix = mutiWriter.encode(content, BarcodeFormat.QR_CODE,
    width, height, hint);
  //  二维矩阵转为一维像素数组
  int halfW = matrix.getWidth() / 2;
  int halfH = matrix.getHeight() / 2;
  int[] pixels = new int[width * height];
  for (int y = 0; y < matrix.getHeight(); y++) {
   for (int x = 0; x < matrix.getWidth(); x++) {
    // 左上角颜色,根据自己需要调整颜色范围和颜色    
    if (x > 0 && x < 170 && y > 0 && y < 170) {
     Color color = new Color(231, 144, 56);
     int colorInt = color.getRGB();
     pixels[y * width + x] = matrix.get(x, y) ? colorInt
       : 16777215;
    }
    //  读取图片
    else if (x > halfW - IMAGE_HALF_WIDTH
      && x < halfW + IMAGE_HALF_WIDTH
      && y > halfH - IMAGE_HALF_WIDTH
      && y < halfH + IMAGE_HALF_WIDTH) {
     pixels[y * width + x] = srcPixels[x - halfW
       + IMAGE_HALF_WIDTH][y - halfH + IMAGE_HALF_WIDTH];
    } else if ((x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH
      && x < halfW - IMAGE_HALF_WIDTH + FRAME_WIDTH
      && y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
      + IMAGE_HALF_WIDTH + FRAME_WIDTH)
      || (x > halfW + IMAGE_HALF_WIDTH - FRAME_WIDTH
        && x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH
        && y > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
        + IMAGE_HALF_WIDTH + FRAME_WIDTH)
      || (x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH
        && x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH
        && y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
        - IMAGE_HALF_WIDTH + FRAME_WIDTH)
      || (x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH
        && x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH
        && y > halfH + IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
        + IMAGE_HALF_WIDTH + FRAME_WIDTH)) {
     pixels[y * width + x] = 0xfffffff;
     //  在图片四周形成边框
    } else {
     // 二维码颜色
     int num1 = (int) (50 - (50.0 - 13.0) / matrix.getHeight()
       * (y + 1));
     int num2 = (int) (165 - (165.0 - 72.0) / matrix.getHeight()
       * (y + 1));
     int num3 = (int) (162 - (162.0 - 107.0)
       / matrix.getHeight() * (y + 1));
     Color color = new Color(num1, num2, num3);
     int colorInt = color.getRGB();
     //  此处可以修改二维码的颜色，可以分别制定二维码和背景的颜色；
     pixels[y * width + x] = matrix.get(x, y) ? colorInt
       : 16777215;
     // 0x000000:0xffffff    
    }
   }
  }
  BufferedImage image = new BufferedImage(width, height,
    BufferedImage.TYPE_INT_RGB);
  image.getRaster().setDataElements(0, 0, width, height, pixels);
  return image;
 }

 private static BufferedImage scale(String srcImageFile, int height,
   int width, boolean hasFiller) throws IOException {
  double ratio = 0.0; // 缩放比例
  File file = new File(srcImageFile);
  BufferedImage srcImage = ImageIO.read(file);
  Image destImage = srcImage.getScaledInstance(width, height,
    BufferedImage.SCALE_SMOOTH);
  //  计算比例  
  if ((srcImage.getHeight() > height) || (srcImage.getWidth() > width)) {
   if (srcImage.getHeight() > srcImage.getWidth()) {
    ratio = (new Integer(height)).doubleValue()
      / srcImage.getHeight();
   } else {
    ratio = (new Integer(width)).doubleValue()
      / srcImage.getWidth();
   }
   AffineTransformOp op = new AffineTransformOp(
     AffineTransform.getScaleInstance(ratio, ratio), null);
   destImage = op.filter(srcImage, null);
  }
  if (hasFiller) {
   // 补白
   BufferedImage image = new BufferedImage(width, height,
     BufferedImage.TYPE_INT_RGB);
   Graphics2D graphic = image.createGraphics();
   graphic.setColor(Color.white);
   graphic.fillRect(0, 0, width, height);
   if (width == destImage.getWidth(null))
    graphic.drawImage(destImage, 0,
      (height - destImage.getHeight(null)) / 2,
      destImage.getWidth(null), destImage.getHeight(null),
      Color.white, null);
   else
    graphic.drawImage(destImage,
      (width - destImage.getWidth(null)) / 2, 0,
      destImage.getWidth(null), destImage.getHeight(null),
      Color.white, null);
   graphic.dispose();
   destImage = image;
  }
  return (BufferedImage) destImage;
 }

 public static void main(String[] args) throws UnsupportedEncodingException {
  // 依次为内容(不支持中文),宽,长,中间图标路径,储存路径  
  MatrixToImageWriter.encode("http://www.baidu.com/", 512, 512,
    "D:\logo.png", "D:\2013-01.jpg");

 }
}