java 转换图片为字符串，将字符串转换成图片显示

该方法只适用于比较小的图片传输，50K以内：

java code：

try{
// 将图片转换成字符串
File imgFile = new File("f:\\Vista.png");
FileInputStream fis = new FileInputStream( imgFile );
byte[] bytes = new byte[fis.available()];
fis.read(bytes);
fis.close();
String imgStr = byte2hex( bytes );
//System.out.println( imgStr);
// 将字符串转换成二进制，用于显示图片
byte[] imgByte = hex2byte( imgStr );
InputStream in = new ByteArrayInputStream( imgByte );
byte[] b = new byte[1024];
int nRead = 0;
OutputStream o = response.getOutputStream();
while( ( nRead = in.read(b) ) != -1 ){
o.write( b, 0, nRead );
}
o.flush();
o.close();
in.close();
}catch(Exception e){
e.printStackTrace();
}