int rows = 4; //初始化有小图片的数量

int cols = 4;

int chunks = rows * cols;

int chunkWidth, chunkHeight;

int type;

//读取图片文件

File[] imgFiles = new File[chunks];

for (int i = 0; i < chunks; i++) {

imgFiles[i] = new File("img" + i + ".jpg");

}

//缓存图片文件

BufferedImage[] buffImages = new BufferedImage[chunks];

for (int i = 0; i < chunks; i++) {

buffImages[i] = ImageIO.read(imgFiles[i]);

}

type = buffImages[0].getType();

chunkWidth = buffImages[0].getWidth();

chunkHeight = buffImages[0].getHeight();

//初始化最终的图片缓存器

BufferedImage finalImg = new BufferedImage(chunkWidth*cols, chunkHeight*rows, type);

int num = 0;

for (int i = 0; i < rows; i++) {

for (int j = 0; j < cols; j++) {

finalImg.createGraphics().drawImage(buffImages[num], chunkWidth * j, chunkHeight * i, null);

num++;

}

}

System.out.println("图片组合完");

ImageIO.write(finalImg, "jpeg", new File("b.jpg"));

}

生成的大图片：