Java图片裁剪合并

gistfile1.java

/*
 * 2012/12/11
 * ding
 * */

import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import javax.imageio.ImageIO;



public class ImageUtil
{
	
	public static BufferedImage ResizeToWidth(BufferedImage image ,int width)
	{
		if (image.getWidth() == width) return image;
		int height = image.getHeight() * width / image.getWidth();
		BufferedImage ret = new BufferedImage(width, height, image.getType());
		Graphics g = ret.getGraphics();
		g.drawImage(image,0,0,width,height,null);
		g.dispose();
		return ret;
	}
	
	public static byte[] mergeImage(byte[] image1,byte[] image2,Integer width,String format) throws IOException
	{
		BufferedImage bi1 = ImageIO.read(new ByteArrayInputStream(image1));
		BufferedImage bi2 = ImageIO.read(new ByteArrayInputStream(image2));
		int des_width;
		if(width == null)
		{
			des_width = bi1.getWidth() < bi2.getWidth() ? bi1.getWidth():bi2.getWidth();
		}else
		{
			des_width = width;
		}
		//resize to same width
		bi1 = ResizeToWidth(bi1, des_width);
		bi2 = ResizeToWidth(bi2, des_width);

		//merge
		int [] rgb1 = new int[bi1.getWidth() * bi1.getHeight()];
		int [] rgb2 = new int[bi2.getWidth() * bi2.getHeight()];
		rgb1 = bi1.getRGB(0, 0, bi1.getWidth(), bi1.getHeight(), rgb1, 0, des_width);
		rgb2 = bi2.getRGB(0, 0, bi2.getWidth(), bi2.getHeight(), rgb2, 0, des_width);
		
		
		
		BufferedImage ret = new BufferedImage(des_width, bi1.getHeight() + bi2.getHeight(),bi1.getType());
		
		ret.setRGB(0, 0, bi1.getWidth(), bi1.getHeight(), rgb1, 0, bi1.getWidth());
		ret.setRGB(0, bi1.getHeight(), bi2.getWidth(), bi2.getHeight(), rgb2, 0, bi2.getWidth());
		
		ByteArrayOutputStream out = new ByteArrayOutputStream();
		if (format == null)
		{
			format = "JPG";
		}
		ImageIO.write(ret, format, out);
		
		return out.toByteArray();
	}
	
	public static byte[] readFile2Bytes(String filename) throws IOException
	{
		File file = new File(filename);
		FileInputStream fi = new FileInputStream(file);
		byte[] buffer = new byte[(int) file.length()];  
		int offset = 0;  
        int numRead = 0;  
        while (offset < buffer.length  
        && (numRead = fi.read(buffer, offset, buffer.length - offset)) >= 0) {  
            offset += numRead;  
        }  
        fi.close(); 
        return buffer;
	}

	public static void createFile(String path, byte[] content) throws IOException
	{  
		  
		FileOutputStream fos = new FileOutputStream(path);  
		fos.write(content);  
		fos.close();  
	}
	
	public static void main(String[] args) throws FileNotFoundException, IOException
	{
		createFile("out.png",mergeImage(readFile2Bytes("E:/HuohuaWorkspace/java/anteater-kernel/src/main/java/com/huohua/anteater/util/180.png"),
				readFile2Bytes("E:/HuohuaWorkspace/java/anteater-kernel/src/main/java/com/huohua/anteater/util/180.png"),null,null));
        
	}
}