图片拼接

完整代码：

package com.test;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.font.FontRenderContext;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.UUID;

import javax.imageio.ImageIO;

public class WaterMarkUtils2 {

	// 默认格式
	private static final String FORMAT_NAME = "JPG";
	// 默认 宽度
	private static final int WIDTH = 100;
	// 默认 高度
	private static final int HEIGHT = 100;

	public static void main(String[] args) {

		// 输入图片地址
		String[] imgs = { "C:\\Users\\edz\\Desktop\\b1.jpg","C:\\Users\\edz\\Desktop\\a1.jpg" };
		// 调用方法生成图片
		merge(imgs, "jpg", "C:\\Users\\edz\\Desktop\\b2.jpg");

	}

	/**
	 * Java拼接多张图片
	 * 
	 * @param imgs
	 *            图片地址集合
	 * @param type
	 *            图片类型
	 * @param dst_pic
	 *            //输出的文件：F:/test2.jpg
	 * @return
	 */
	public static boolean merge(String[] imgs, String type, String dst_pic) {
		// 获取需要拼接的图片长度
		int len = imgs.length;
		// 判断长度是否大于0
		if (len < 1) {
			return false;
		}
		File[] src = new File[len];
		BufferedImage[] images = new BufferedImage[len];
		int[][] ImageArrays = new int[len][];
		for (int i = 0; i < len; i++) {
			try {
				src[i] = new File(imgs[i]);
				images[i] = ImageIO.read(src[i]);
			} catch (Exception e) {
				e.printStackTrace();
				return false;
			}
			int width = images[i].getWidth();
			int height = images[i].getHeight();
			// 从图片中读取RGB 像素
			ImageArrays[i] = new int[width * height];
			ImageArrays[i] = images[i].getRGB(0, 0, width, height,
					ImageArrays[i], 0, width);
		}

		int dst_height = 0;
		int dst_width = images[0].getWidth();
		// 合成图片像素
		for (int i = 0; i < images.length; i++) {
			dst_width = dst_width > images[i].getWidth() ? dst_width
					: images[i].getWidth();
			dst_height += images[i].getHeight();
		}
		// 合成后的图片
		System.out.println("宽度:" + dst_width);
		System.out.println("高度:" + dst_height);
		if (dst_height < 1) {
			System.out.println("dst_height < 1");
			return false;
		}
		// 生成新图片
		try {
			dst_width = images[0].getWidth();
			BufferedImage ImageNew = new BufferedImage(dst_width, dst_height,
					BufferedImage.TYPE_INT_RGB);
			int height_i = 0;
			for (int i = 0; i < images.length; i++) {
				ImageNew.setRGB(0, height_i, dst_width, images[i].getHeight(),
						ImageArrays[i], 0, dst_width);
				height_i += images[i].getHeight();
			}

			File outFile = new File(dst_pic);
			ImageIO.write(ImageNew, type, outFile);// 写图片 ，输出到硬盘
		} catch (Exception e) {
			e.printStackTrace();
			return false;
		}
		return true;
	}

	/**
	 * 获取图片
	 * 
	 * @param content
	 *            内容
	 * @param font
	 *            字体
	 * @param width
	 *            宽
	 * @param height
	 *            高
	 * @param destPath
	 *            输出路径
	 * @throws IOException
	 */
	public static void getImage(String content, Font font, Integer width,
			Integer height, String destPath) throws IOException {
		mkdirs(destPath);
		String file = UUID.randomUUID().toString() + ".jpg";
		ImageIO.write(getImage(content, font, width, height), FORMAT_NAME,
				new File(destPath + "/" + file));
	}

	/**
	 * 创建 目录
	 * 
	 * @param destPath
	 */
	public static void mkdirs(String destPath) {
		File file = new File(destPath);
		// 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常)
		if (!file.exists() && !file.isDirectory()) {
			file.mkdirs();
		}
	}

	/**
	 * 创建图片
	 * 
	 * @param content
	 *            内容
	 * @param font
	 *            字体
	 * @param width
	 *            宽
	 * @param height
	 *            高
	 * @return
	 */
	private static BufferedImage createImage(String content, Font font,
			Integer width, Integer height) {
		BufferedImage bi = new BufferedImage(width, height,
				BufferedImage.TYPE_INT_RGB);
		Graphics2D g2 = (Graphics2D) bi.getGraphics();
		g2.setBackground(Color.WHITE);
		g2.clearRect(0, 0, width, height);
		g2.setPaint(Color.BLACK);

		FontRenderContext context = g2.getFontRenderContext();
		Rectangle2D bounds = font.getStringBounds(content, context);
		double x = (width - bounds.getWidth()) / 2;
		double y = (height - bounds.getHeight()) / 2;
		double ascent = -bounds.getY();
		double baseY = y + ascent;

		g2.drawString(content, (int) x, (int) baseY);

		return bi;
	}

	/**
	 * 获取 图片
	 * 
	 * @param content
	 *            内容
	 * @param font
	 *            字体
	 * @param width
	 *            宽
	 * @param height
	 *            高
	 * @return
	 */
	public static BufferedImage getImage(String content, Font font,
			Integer width, Integer height) {
		width = width == null ? WIDTH : width;
		height = height == null ? HEIGHT : height;
		if (null == font)
			font = new Font("Serif", Font.BOLD, 11);
		return createImage(content, font, width, height);
	}
}