图像字节数组转换成String类型

File file = new File("C:/abc.png");

InputStream is = new FileInputStream(file);

byte[] byte = new byte[200000];

is.read(byte);

BASE64Encoder  encoder = new BASE64Encoder();

String str=  encoder.encode(b);
BASE64Decoder base = new BASE64Decoder();
byte[] c =base.decodeBuffer(str);