java 图片字节_Java 图片与byte数组互相转换

Java 图片与byte数组互相转换

//图片到byte数组

public byte[] image2byte(String path){

byte[] data = null;

FileImageInputStream input = null;

try {

input = new FileImageInputStream(new File(path));

ByteArrayOutputStream output = new ByteArrayOutputStream();

byte[] buf = new byte[1024];

int numBytesRead = 0;

while ((numBytesRead = input.read(buf)) != -1) {

output.write(buf, 0, numBytesRead);

}

data = output.toByteArray();

output.close();

input.close();

}

catch (FileNotFoundException ex1) {

ex1.printStackTrace();

}

catch (IOException ex1) {

ex1.printStackTrace();

}

return data;

}

//byte数组到图片

public void byte2image(byte[] data,String path){

if(data.length<3||path.equals("")) return;

try{

FileImageOutputStream imageOutput = new FileImageOutputStream(new File(path));

imageOutput.write(data, 0, data.length);

imageOutput.close();

System.out.println("Make Picture success,Please find image in " + path);

} catch(Exception ex) {

System.out.println("Exception: " + ex);

ex.printStackTrace();

}

}

//byte数组到16进制字符串

public String byte2string(byte[] data){

if(data==null||data.length<=1) return "0x";

if(data.length>200000) return "0x";

StringBuffer sb = new StringBuffer();

int buf[] = new int[data.length];

//byte数组转化成十进制

for(int k=0;k

buf[k] = data[k]<0?(data[k]+256):(data[k]);

}

//十进制转化成十六进制

for(int k=0;k

if(buf[k]<16) sb.append("0"+Integer.toHexString(buf[k]));

else sb.append(Integer.toHexString(buf[k]));

}

return "0x"+sb.toString().toUpperCase();

}