java 实现图片拼接

1、想要实现多个图片的纵向和横向拼接。实现代码如下

2、补充发现横向拼接的一个bug 宽度没有增加（已修复）

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实现图片拼接的代码：

import javax.imageio.ImageIO;

import java.awt.image.BufferedImage;
import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @Author : guoyanan
 * @Title :  处理图片的拼接工具类
 * @Time : 2019/02/11 10:47
 * @Document :
 */
public class ImageHandle {

    /**
     * 图片拼接图片必须长宽一致
     * @param files  需要拼接的图片类型
     * @param type  1-横向拼接，2-纵向拼接
     * @param targetFile 目标文件名称
     */
    public static boolean mergeImage(File[] files, int type ,String targetFile){
        int len = files.length;
        if(len<1){
            throw new RuntimeException("图片数量为0，不可以执行拼接");
        }
       // 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(files[i]);
                images[i] = ImageIO.read(files[i]);
            }catch (Exception e){
                e.printStackTrace();
            }

            int width = images[i].getWidth();
            int height = images[i].getHeight();
            ImageArrays[i] = new int[width * height];
            ImageArrays[i] = images[i].getRGB(0,0,width,height,ImageArrays[i],0,width);
        }

        int newHeight = 0;
        int newWidth = 0;
         for(int i = 0; i < images.length;i++){
             // 横向
             if(type == 1){
                 newHeight = newHeight > images[i].getHeight() ? newWidth : images[i].getHeight();
　　　　　　　　　　// 错误代码，原先没有添加+ 号
                 newWidth += images[i].getWidth();
             }else if (type == 2){
                 // 纵向
                 newWidth = newHeight > images[i].getWidth() ? newWidth : images[i].getWidth();
                 newHeight += images[i].getHeight();
             }
         }

         if(type == 1 && newWidth < 1){
             return false ;
         }

        if(type == 2 && newHeight < 1){
            return false;
        }


        try {
            BufferedImage ImageNew = new BufferedImage(newWidth, newHeight, BufferedImage.TYPE_INT_RGB);
            int height_i = 0;
            int width_i = 0;
            for (int i = 0; i < images.length; i++){
                if(type == 1){
                    ImageNew.setRGB(width_i, 0, images[i].getWidth(), newHeight, ImageArrays[i], 0, images[i].getWidth());
                    width_i += images[i].getWidth();
                }else if (type == 2){
                    ImageNew.setRGB(0, height_i, newWidth, images[i].getHeight(), ImageArrays[i], 0, newWidth);
                    height_i += images[i].getHeight();
                }
            }
            // 输出想要的图片
            ImageIO.write(ImageNew,targetFile.split("\.")[1], new File(targetFile));
           return true;
        }catch (Exception e){
            e.printStackTrace();
            return false;
        }
    }


    public static void main(String[] args){
        //String[] files = {"F:\tmp\OK.jpg","F:\tmp\OK.jpg","F:\tmp\OK.jpg","F:\tmp\OK.jpg","F:\tmp\OK.jpg"};
        //mergeImage(files,2,"F:\OK.jpg");

        List<Map<String,String>> lists = new ArrayList<Map<String,String>>();

        Map<String,String>  map1 = new HashMap<>();
        map1.put("id","1");
        map1.put("cpid","0");
        map1.put("text","One Level");

        Map<String,String>  map2 = new HashMap<>();
        map2.put("id","2");
        map2.put("cpid","1");
        map2.put("text","Two Level");


        Map<String,String>  map3 = new HashMap<>();
        map3.put("id","3");
        map3.put("cpid","2");
        map3.put("text","Three Level");

        lists.add(map1);
        lists.add(map2);
        lists.add(map3);
        List<Map<String,String>> listUp = new ArrayList<Map<String,String>>();
        List<Map<String,String>> listTemp = new ArrayList<Map<String,String>>();
        for (int i= 0; i < lists.size();i++){
            Map<String,String>  map = lists.get(i);
            if(map.get("cpid")=="0"){
                listUp.add(map);
                lists.remove(i);
                System.out.println(map.get("text"));
            }
        }

        ItentorMap(listUp,lists,listTemp);


    }

    private static void ItentorMap(List<Map<String,String>> listUp,List<Map<String,String>> listDown,List<Map<String,String>> listTemp){
        System.out.println("listUp:"+System.identityHashCode(listUp));
        System.out.println("listTemp:"+System.identityHashCode(listTemp));
        listTemp.clear();
        for (int i=0; i<listUp.size(); i++){
            Map<String,String>  map = listUp.get(i);
            for(int j = 0; j < listDown.size(); j++){
                Map<String,String>  mapj = listDown.get(j);
                if(map.get("id")==mapj.get("cpid")){
                    listTemp.add(mapj);
                    listDown.remove(j);
                    System.out.println(mapj.get("text"));
                }
            }

        }
        listUp.clear();
       // 必须这样写，如果写成listUp=listTemp，会导致2个list集合的内存地址一样。
        for (int i = 0;i<listTemp.size(); i++){
            listUp.add(listTemp.get(i));
        }
        System.out.println("listUp:"+System.identityHashCode(listUp));
        System.out.println("listTemp:"+System.identityHashCode(listTemp));

        if(listDown.size()>0) {
            ItentorMap(listUp, listDown, listTemp);
        }
    }

}