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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