java实现图像转码为字符画的方法

本文实例为大家分享了java实现图像转码为字符画的具体代码，供大家参考，具体内容如下

public class ImageProcesser { 

 private static final char[] charset1 = {'M','8','V','|',':','.',' '}; //默认字符素材集
 private char[] charset; //字符画素材集
 private String imgString = ""; //储存转化后的字符串 

 //使用指定字符集构造
 public ImageProcesser(char[] charset){
  this.charset = charset;
 }
 //使用默认字符集构造
 public ImageProcesser(){
  this.charset = charset1;
 } 

 public String getImgString(){
  return imgString;
 } 

 /*将图形文件转化为字符画字符串*/
 public ImageProcesser toBitmapConvert(String imagepath){
  return toBitmapConvert(new File(imagepath));
 }
 public ImageProcesser toBitmapConvert(File imageFile){ 

  StringBuffer sb = new StringBuffer();
  if(!imageFile.exists()){ //当读取的文件不存在时，结束程序
   System.out.println("File is not exists!");
   System.exit(1);
  }
  Color color;
  try{
   BufferedImage buff = ImageIO.read(imageFile); //将图片文件装载如BufferedImage流
   buff = compressImage(buff); 

   int bitmapH = buff.getHeight();
   int bitmapW = buff.getWidth(); 

   //逐行扫描图像的像素点，读取RGB值，取其平均值，并从charset中获取相应的字符素材，并装载到sb中
   for(int y=0; y<bitmapH; y++){
    for(int x=0; x<bitmapW; x++){
     int rgb = buff.getRGB(x,y);
     color = new Color(rgb); 

     int cvalue = (color.getRed()+color.getGreen()+color.getBlue()) / 3;
     sb.append(charset[(int)((cvalue * charset.length - 1)/255)]+" ");
    }
    sb.append("\r\n");
   }
  }catch(IOException ex){
   ex.printStackTrace();
  }
  imgString = sb.toString();
  return this;
 } 

 /*图像文件预处理:将图片压缩到 最长边为 100px*/
 private BufferedImage compressImage(BufferedImage srcImg){
  int h = srcImg.getHeight();
  int w = srcImg.getWidth();
  if(Math.max(h,w)<=100)
   return srcImg;
  int new_H;
  int new_W;
  if(w>h){
   new_W = 100;
   new_H = 100*h/w ;
  }else{
   new_H = 100;
   new_W = 100*w/h;
  }
  BufferedImage smallImg = new BufferedImage(new_W,new_H,srcImg.getType());
  Graphics g = smallImg.getGraphics();
  g.drawImage(srcImg,0,0,new_W,new_H,null);
  g.dispose();
  return smallImg;
 } 

 /*将字符串保存为.txt文件*/
 public void saveAsTxt(String fileName){
  try{
   PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(fileName)));
   for(int i = 0;i<imgString.length();i++){
    out.print(imgString.charAt(i));
   }
   out.close(); 

  }catch(IOException ex){
   ex.printStackTrace();
  }
 } 

 /*批处理图像文件*/
 public static void batchImgFile(String srcfile, String tragetfile){ 

  File folder = new File(tragetfile); //生成图片的文件夹
  File srcfolder = new File(srcfile);
  if(!folder.exists() || !folder.isDirectory())
   folder.mkdirs();
  ImageProcesser processer = new ImageProcesser();
  File[] filelist = srcfolder.listFiles(); 

  for(int i=0;i<filelist.length;i++){
   if(!filelist[i].isFile())
    continue;
   processer.toBitmapConvert(filelist[i]);
   processer.saveAsTxt(tragetfile+"/"+(i+1)+".txt");
   System.out.println(filelist[i].getName()+" is converted!");
  }
  System.out.println("All img were converted!"); 

 } 

}

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