byte[]和String的相互转换以及记录日志的各种方法
import java.io.*;import java.util.Properties;public class FileFunc{public static String hexStr2String(String bytestr) //字节流(以字符串表示)存储到文件{int ll=bytestr.length();if (ll%2!=0) return null;try{byte bt_file[]=new byte[ll/2];for (int i=0;i<ll/2;i++){bt_file[i]=(byte)Integer.parseInt(bytestr.substring(i*2,i*2+2),16);}String content=new String(bt_file,0,bt_file.length,"GBK");return content;}catch (Exception e){return null;}}public static final byte[] hexStrToBytes(Strings)//转换16进制字符串为字节{byte[]bytes;bytes = new byte[s.length() / 2];for (int i = 0; i < bytes.length; i++){bytes[i] = (byte)Integer.parseInt(s.substring(2 * i, 2 * i + 2), 16);}return bytes;} private static String byte2str(byte b) //一个字节转换成为16进制字符串{int t;if (b<0){t=b+256;}else{t=b;}String retval=Integer.toHexString(t).toLowerCase();if (retval.length()==1) retval="0"+retval;return retval;}public static boolean saveBytes2File(String filename,byte[] bbb)//保存字节流中的数据到文件。{try{FileOutputStream out=new FileOutputStream(filename);//byte bbb[]=buffer.getBytes("GBK");out.write(bbb);out.close();return true;}catch (Exception e){return false;}}public static void logInfo(String filename,String info)//按照GBK编码保存数据到文件。{try{FileOutputStream out=new FileOutputStream(filename);byte bt_prompt[]=info.getBytes("GBK");out.write(bt_prompt);out.close();}catch (Exception e){}}public static void logInfo(String filename,String info,boolean append)//按照GBK编码保存数据到文件,如果文件存在，追加数据到文件中。{try{FileOutputStream out=new FileOutputStream(filename,append);byte bt_prompt[]=info.getBytes("GBK");out.write(bt_prompt);out.close();}catch (Exception e){}}public static void logInfo(String filename,String info,boolean append,String encode)//按照指定编码保存数据到文件,如果文件存在，追加数据到文件中。{try{FileOutputStream out=new FileOutputStream(filename,append);byte bt_prompt[]=info.getBytes(encode);out.write(bt_prompt);out.close();}catch (Exception e){}}public static String getProValue(String path,String name){ String value = ""; try {FileInputStream is=new FileInputStream(new File(path));Properties props = new Properties();props.load(is);value = props.getProperty(name);//System.out.println("--value="+value);is.close(); } catch (Exception e) {System.out.println("getProValue:"+e.toString()); } return value;}}