java图片合并以及拼接

package com.cjbdi.util;

import java.awt.AlphaComposite;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;

import javax.imageio.ImageIO;

/**
 * 该类实现了图片的合并功能，可以选择水平合并或者垂直合并。
 * 当然此例只是针对两个图片的合并，如果想要实现多个图片的合并，只需要自己实现方法 BufferedImage
 * mergeImage(BufferedImage[] imgs, boolean isHorizontal)即可；
 * 而且这个方法更加具有通用性，但是时间原因不实现了，方法和两张图片实现是一样的
 */

public class ImageMerge {

    /**
     * @param fileUrl 文件绝对路径或相对路径
     * @return 读取到的缓存图像
     * @throws IOException 路径错误或者不存在该文件时抛出IO异常
     */
    public static BufferedImage getBufferedImage(String fileUrl)
            throws IOException {
        File f = new File(fileUrl);
        return ImageIO.read(f);
    }


    /**
     * 远程图片转BufferedImage
     *
     * @param destUrl 远程图片地址
     * @return
     */
    public static BufferedImage getBufferedImageDestUrl(String destUrl) {
        HttpURLConnection conn = null;
        BufferedImage image = null;
        try {
            URL url = new URL(destUrl);
            conn = (HttpURLConnection) url.openConnection();
            if (conn.getResponseCode() == 200) {
                image = ImageIO.read(conn.getInputStream());
                return image;
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            conn.disconnect();
        }
        return image;
    }

    /**
     * 输出图片
     *
     * @param buffImg  图像拼接叠加之后的BufferedImage对象
     * @param savePath 图像拼接叠加之后的保存路径
     */
    public static void generateSaveFile(BufferedImage buffImg, String savePath) {
        int temp = savePath.lastIndexOf(".") + 1;
        try {
            File outFile = new File(savePath);
            if (!outFile.exists()) {
                outFile.createNewFile();
            }
            ImageIO.write(buffImg, savePath.substring(temp), outFile);
            System.out.println("ImageIO write...");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * @param buffImg   源文件(BufferedImage)
     * @param waterFile 水印文件(BufferedImage)
     * @param x         距离右下角的X偏移量
     * @param y         距离右下角的Y偏移量
     * @param alpha     透明度, 选择值从0.0~1.0: 完全透明~完全不透明
     * @return BufferedImage
     * @throws IOException
     * @Title: 构造图片
     * @Description: 生成水印并返回java.awt.image.BufferedImage
     */
    public static BufferedImage overlyingImage(BufferedImage buffImg, BufferedImage waterImg, int x, int y, float alpha) throws IOException {

        // 创建Graphics2D对象，用在底图对象上绘图
        Graphics2D g2d = buffImg.createGraphics();
        int waterImgWidth = waterImg.getWidth();// 获取层图的宽度
        int waterImgHeight = waterImg.getHeight();// 获取层图的高度
        // 在图形和图像中实现混合和透明效果
        g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha));
        // 绘制
        g2d.drawImage(waterImg, x, y, waterImgWidth, waterImgHeight, null);
        g2d.dispose();// 释放图形上下文使用的系统资源
        return buffImg;
    }


    /**
     * 待合并的两张图必须满足这样的前提，如果水平方向合并，则高度必须相等；如果是垂直方向合并，宽度必须相等。
     * mergeImage方法不做判断，自己判断。
     *
     * @param img1         待合并的第一张图
     * @param img2         带合并的第二张图
     * @param isHorizontal 为true时表示水平方向合并，为false时表示垂直方向合并
     * @return 返回合并后的BufferedImage对象
     * @throws IOException
     */
    public static BufferedImage mergeImage(BufferedImage img1,
                                           BufferedImage img2, boolean isHorizontal) throws IOException {
        int w1 = img1.getWidth();
        int h1 = img1.getHeight();
        int w2 = img2.getWidth();
        int h2 = img2.getHeight();

        // 从图片中读取RGB
        int[] ImageArrayOne = new int[w1 * h1];
        ImageArrayOne = img1.getRGB(0, 0, w1, h1, ImageArrayOne, 0, w1); // 逐行扫描图像中各个像素的RGB到数组中
        int[] ImageArrayTwo = new int[w2 * h2];
        ImageArrayTwo = img2.getRGB(0, 0, w2, h2, ImageArrayTwo, 0, w2);

        // 生成新图片
        BufferedImage DestImage = null;
        if (isHorizontal) { // 水平方向合并
            DestImage = new BufferedImage(w1 + w2, h1, BufferedImage.TYPE_INT_RGB);
            DestImage.setRGB(0, 0, w1, h1, ImageArrayOne, 0, w1); // 设置上半部分或左半部分的RGB
            DestImage.setRGB(w1, 0, w2, h2, ImageArrayTwo, 0, w2);
        } else { // 垂直方向合并
            DestImage = new BufferedImage(w1, h1 + h2, BufferedImage.TYPE_INT_RGB);
            DestImage.setRGB(0, 0, w1, h1, ImageArrayOne, 0, w1); // 设置上半部分或左半部分的RGB
            DestImage.setRGB(0, h1, w2, h2, ImageArrayTwo, 0, w2); // 设置下半部分的RGB
        }

        return DestImage;
    }

    /**
     * Java 测试图片叠加方法
     */
    public static void overlyingImageTest(String fromImage1, int fromImage2) {

        String sourceFilePath = "/Users/gaotengfei/Library/Containers/com.tencent.xinWeChat/Data/Library/Application Support/com.tencent.xinWeChat/2.0b4.0.9/03f04497b9d216597c344638d77c156e/Message/MessageTemp/10944c44d02a8bab9912282f7a619448/File/1-1/" + fromImage1 + ".png";
        System.out.println(sourceFilePath);
        String waterFilePath = "/Users/gaotengfei/Library/Containers/com.tencent.xinWeChat/Data/Library/Application Support/com.tencent.xinWeChat/2.0b4.0.9/03f04497b9d216597c344638d77c156e/Message/MessageTemp/10944c44d02a8bab9912282f7a619448/File/1-1/1-" + fromImage2 + ".png";
        String saveFilePath = "/Users/gaotengfei/Library/Containers/com.tencent.xinWeChat/Data/Library/Application Support/com.tencent.xinWeChat/2.0b4.0.9/03f04497b9d216597c344638d77c156e/Message/MessageTemp/10944c44d02a8bab9912282f7a619448/File/1-1/new-1.png";
        try {
            BufferedImage bufferImage1 = getBufferedImage(sourceFilePath);
            BufferedImage bufferImage2 = getBufferedImage(waterFilePath);

            // 构建叠加层
            BufferedImage buffImg = overlyingImage(bufferImage1, bufferImage2, 0, 0, 1.0f);
            // 输出水印图片
            generateSaveFile(buffImg, saveFilePath);
        } catch (IOException e) {
            e.printStackTrace();
        }

    }


    /**
     * Java 测试图片合并方法
     */
    public static void imageMargeTest() {
        // 读取待合并的文件
        BufferedImage bi1 = null;
        BufferedImage bi2 = null;
        // 调用mergeImage方法获得合并后的图像
        BufferedImage destImg = null;
        System.out.println("下面是垂直合并的情况：");
        String saveFilePath = "/Users/gaotengfei/Library/Containers/com.tencent.xinWeChat/Data/Library/Application Support/com.tencent.xinWeChat/2.0b4.0.9/03f04497b9d216597c344638d77c156e/Message/MessageTemp/10944c44d02a8bab9912282f7a619448/File/1-1/1-1.png";
        String divingPath = "/Users/gaotengfei/Library/Containers/com.tencent.xinWeChat/Data/Library/Application Support/com.tencent.xinWeChat/2.0b4.0.9/03f04497b9d216597c344638d77c156e/Message/MessageTemp/10944c44d02a8bab9912282f7a619448/File/1-1/1-2.png";
        String margeImagePath = "/Users/gaotengfei/Library/Containers/com.tencent.xinWeChat/Data/Library/Application Support/com.tencent.xinWeChat/2.0b4.0.9/03f04497b9d216597c344638d77c156e/Message/MessageTemp/10944c44d02a8bab9912282f7a619448/File/1-1/margeNew.png";
        try {
            bi1 = getBufferedImage(saveFilePath);
            bi2 = getBufferedImage(divingPath);
            // 调用mergeImage方法获得合并后的图像
            destImg = mergeImage(bi1, bi2, false);
        } catch (IOException e) {
            e.printStackTrace();
        }
        // 保存图像
        generateSaveFile(destImg, margeImagePath);
        System.out.println("垂直合并完毕!");
    }

    public static void main(String[] args) {
        for (int i = 1; i <= 7; i++) {
            System.out.println(i);
            if (i == 1) {
                overlyingImageTest("1-"+i + "", i + 1 );
            }
            if (i + 2 < 10 && i != 1) {
                overlyingImageTest("new-1", i + 1 );
            }
        }
//        //1-
//        overlyingImageTest( "new-1", 8);
    }

}