二进制与字符串转换（图片转换）
?将一个图片转换成二进制编码，再将一个二进制字符串转换成为图片实例：
?
?
public class Test{public static void main(String[] args) {try{ // 将图片转换成字符串 File f = new File("c:\\biao.png"); FileInputStream fis = new FileInputStream( f ); byte[] bytes = new byte[fis.available()]; fis.read(bytes); fis.close(); // 生成字符串 String imgStr = byte2hex( bytes ); System.out.println( imgStr); // 将字符串转换成二进制，用于显示图片 // 将上面生成的图片格式字符串 imgStr，还原成图片显示 OutputStream o = new FileOutputStream("c:\\878789.png"); byte[] imgByte = hex2byte( imgStr ); InputStream in = new ByteArrayInputStream( imgByte ); byte[] b = new byte[1024]; int nRead = 0; while( ( nRead = in.read(b) ) != -1 ){ o.write( b, 0, nRead ); } o.flush(); o.close(); in.close(); }catch(Exception e){ e.printStackTrace(); }finally{ } }/** * 二进制转字符串 * @param b byte数组 * @return 二进制字符串 */public static String byte2hex(byte[] b){StringBuffer sb = new StringBuffer();String stmp = "";for (int n = 0; n < b.length; n++) {stmp = Integer.toHexString(b[n] & 0XFF);if (stmp.length() == 1) {sb.append("0" + stmp);} else {sb.append(stmp);}}return sb.toString();}/** * 字符串转二进制 * @param str 字符串 * @return byte数组 */public static byte[] hex2byte(String str) {if (str == null)return null;str = str.trim();int len = str.length();if (len == 0 || len % 2 == 1)return null;byte[] b = new byte[len / 2];try {for (int i = 0; i < str.length(); i += 2) {b[i / 2] = (byte) Integer.decode("0X" + str.substring(i, i + 2)).intValue();}return b;} catch (Exception e) {return null;}}}?