图片-字符串互转

来源：互联网发布：php后端技术架构编辑：程序博客网时间：2024/05/13 11:12
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：
    // author:yswang// date:2009/10/09try{OutputStream o = response.getOutputStream();// 将图片转换成字符串File f = new File("f:\\Vista.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{}public static String byte2hex(byte[] b) // 二进制转字符串{   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();}public static byte[] hex2byte(String str) { // 字符串转二进制    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;    } }
转载于：http://piziwang.iteye.com/blog/483767