package com.loyom.mp.handle;
 
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
 
public class ImageHandle {
 
    public BufferedImage marge(String first, String last, boolean isVertical) {
        BufferedImage one = this.readImage(first);
        BufferedImage two = this.readImage(last);
        if (isVertical) {
            return this.mergeTwoImageByVertical(one, two);
        } else {
            return this.mergeTwoImageByHorizontal(one, two);
        }
    }
 
    public void saveImage(String savePath, BufferedImage image) {
        try {
            File file = new File(savePath);
            ImageIO.write(image, "jpg", file);// 写图片  
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }
 
    private BufferedImage mergeTwoImageByVertical(BufferedImage one, BufferedImage two) {
        int width = this.getWidth(one);
        int height = this.getHeight(one);
 
        int[] oneRPG = this.readImageRPG(one);
        int[] twoRPG = this.readImageRPG(two);
 
        BufferedImage result = new BufferedImage(width, height * 2, BufferedImage.TYPE_INT_RGB);
        result.setRGB(0, 0, width, height, oneRPG, 0, width);
        result.setRGB(0, height, width, height, twoRPG, 0, width);
        return result;
    }
 
    private BufferedImage mergeTwoImageByHorizontal(BufferedImage one, BufferedImage two) {
        int width = this.getWidth(one);
        int height = this.getHeight(one);
 
        int[] oneRPG = this.readImageRPG(one);
        int[] twoRPG = this.readImageRPG(two);
 
        BufferedImage result = new BufferedImage(width * 2, height, BufferedImage.TYPE_INT_RGB);
        result.setRGB(0, 0, width, height, oneRPG, 0, width);
        result.setRGB(width, 0, width, height, twoRPG, 0, width);
        return result;
    }
 
    private int[] readImageRPG(BufferedImage image) {
        int width = this.getWidth(image);
        int height = this.getHeight(image);
        int[] imageRPG = new int[width * height];// 从图片中读取RGB  
        imageRPG = image.getRGB(0, 0, width, height, imageRPG, 0, width);
        return imageRPG;
    }
 
    private int getWidth(BufferedImage image) {
        if (image == null) {
            return 0;
        }
        return image.getWidth();
 
    }
 
    private int getHeight(BufferedImage image) {
        if (image == null) {
            return 0;
        }
        return image.getHeight();
    }
 
    private BufferedImage readImage(String path) {
        try {
            File file = new File(path);
            return ImageIO.read(file);
        } catch (IOException ex) {
            ex.printStackTrace();
        }
        return null;
    }
}

来自：http://my.oschina.net/u/2370543/blog/487821