import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.util.HashMap;
import java.util.Map;

/**
 * 十六进制转成图片
 * @author Administrator
 *
 */
public class Hex2Image {
	public static void main(String[] args) throws Exception {
		Hex2Image to=new Hex2Image();
		InputStream is=new FileInputStream("f://aa.txt");
		InputStreamReader isr = new InputStreamReader(is);
		BufferedReader br = new BufferedReader(isr);
		String str = null;
		StringBuilder sb = new StringBuilder();
		while ((str = br.readLine()) != null) {
			System.out.println(str);
			sb.append(str);
		}
		to.saveToImgFile(sb.toString().toUpperCase(),"f://dd.jpg");
	
	}
	public void saveToImgFile(String src,String output){
	       if(src==null||src.length()==0){
	           return;
	       }
	       try{
	           FileOutputStream out = new FileOutputStream(new File(output));
	           byte[] bytes = src.getBytes();
	           for(int i=0;i<bytes.length;i+=2){
	               out.write(charToInt(bytes[i])*16+charToInt(bytes[i+1]));
	           }
	           out.close();
	       }catch(Exception e){
	           e.printStackTrace();
	       }
	   }
	   private int charToInt(byte ch){
	       int val = 0;
	       if(ch>=0x30&&ch<=0x39){
	           val=ch-0x30;
	       }else if(ch>=0x41&&ch<=0x46){
	           val=ch-0x41+10;
	       }
	       return val;
	   }
}


//java/6349