public class Image2Hex { 
  public static void main(String[] args) { 
    try{ 
      //存放图片的文件夹 
      File list = new File("d:/qmx"); 
      File[] lists = list.listFiles(); 
      String name; 
      //生成的语句存放文件 
      PrintWriter pw = new PrintWriter(new FileWriter("d:/update.txt"),true); 
      FileInputStream fis = null; 
      byte[] b; 
      for(File file : lists){ 
        //张三.jpg 
        name=file.getName(); 
        fis = new FileInputStream(file); 
        b = new byte[fis.available()]; 
        fis.read(b); 
        pw.println("update sys_userinfo set sign_image =0x" + byte2HexStr(b) + " where realName='" + name.substring(0,name.length() - 4) + "'");    
      } 
      pw.flush(); 
      pw.close();   
    }catch(Exception e){ 
      e.printStackTrace(); 
    } 
  } 
  /** 
   * 
   * 描述：byte转字符串 
   */ 
  public static String byte2HexStr(byte[] b) {   
    StringBuffer hs = new StringBuffer();   
    String stmp="";   
    for (int n=0;n< b.length;n++) {   
      stmp=(Integer.toHexString(b[n] & 0XFF)); 
      hs.append((stmp.length() == 1 ? "0" : "") + stmp); 
    }   
    return hs.toString().toUpperCase();   
  }   
}