Java 图片与byte数组互相转换

 1 //图片到byte数组
 2   public byte[] image2byte(String path){
 3     byte[] data = null;
 4     FileImageInputStream input = null;
 5     try {
 6       input = new FileImageInputStream(new File(path));
 7       ByteArrayOutputStream output = new ByteArrayOutputStream();
 8       byte[] buf = new byte[1024];
 9       int numBytesRead = 0;
10       while ((numBytesRead = input.read(buf)) != -1) {
11       output.write(buf, 0, numBytesRead);
12       }
13       data = output.toByteArray();
14       output.close();
15       input.close();
16     }
17     catch (FileNotFoundException ex1) {
18       ex1.printStackTrace();
19     }
20     catch (IOException ex1) {
21       ex1.printStackTrace();
22     }
23     return data;
24   }

 1   //byte数组到图片
 2   public void byte2image(byte[] data,String path){
 3     if(data.length<3||path.equals("")) return;
 4     try{
 5     FileImageOutputStream imageOutput = new FileImageOutputStream(new File(path));
 6     imageOutput.write(data, 0, data.length);
 7     imageOutput.close();
 8     System.out.println("Make Picture success,Please find image in " + path);
 9     } catch(Exception ex) {
10       System.out.println("Exception: " + ex);
11       ex.printStackTrace();
12     }
13   }
14   //byte数组到16进制字符串
15   public String byte2string(byte[] data){
16     if(data==null||data.length<=1) return "0x";
17     if(data.length>200000) return "0x";
18     StringBuffer sb = new StringBuffer();
19     int buf[] = new int[data.length];
20     //byte数组转化成十进制
21     for(int k=0;k<data.length;k++){
22       buf[k] = data[k]<0?(data[k]+256):(data[k]);
23     }
24     //十进制转化成十六进制
25     for(int k=0;k<buf.length;k++){
26       if(buf[k]<16) sb.append("0"+Integer.toHexString(buf[k]));
27       else sb.append(Integer.toHexString(buf[k]));
28     }
29     return "0x"+sb.toString().toUpperCase();
30   }