2월, 2021

25 02 2021

Centos7 apache install (수동설치)

Haeng Ho Kang | OS, Server, Linux/Unix, Web

root권한으로 실행합니다. 1.필수 라이브러리 설치

[root@hae app]# yum install gcc gcc-c++ expat-devel.x86_64 pcre-devel

1	[root@hae app]# yum install gcc gcc-c++ expat-devel.x86_64 pcre-devel

3.apr, apr-util, pcre,httpd 다운로드 및 컴파일

[root@hae install]#  wget http://mirror.apache-kr.org/httpd/httpd-2.4.46.tar.gz
[root@hae install]# wget http://mirror.apache-kr.org/apr/apr-1.7.0.tar.gz
[root@hae install]#  wget http://mirror.apache-kr.org/apr/apr-util-1.6.1.tar.gz
[root@hae install]# wget https://sourceforge.net/projects/pcre/files/pcre/8.44/pcre-8.44.tar.gz

[root@hae install]# tar zxvf apr-1.7.0.tar.gz
[root@hae install]# tar zxvf apr-util-1.6.1.tar.gz
[root@hae install]# tar zxvf httpd-2.4.46.tar.gz
[root@hae install]# tar zxvf pcre-8.44.tar.gz 

[root@hae install]# mv apr-1.7.0 apr-util-1.6.1 pcre-8.44 httpd-2.4.46 /usr/local/src

[root@hae install]# cd /usr/local/src/
[root@hae src]# ls
apr-1.7.0  apr-util-1.6.1  pcre-8.44

- apr install
[root@hae src]# cd apr-1.7.0/
[root@hae apr-1.7.0]# ./configure --prefix=/usr/local/src/apr-1.7.0
[root@hae apr-1.7.0]# make && make install

- apr-util install
[root@hae src]# cd apr-util-1.6.1/
[root@hae apr-util-1.6.1]# ./configure --prefix=/usr/local/src/apr-util-1.6.1 --with-apr=/usr/local/src/apr-1.7.0
[root@hae apr-util-1.6.1]# make && make install

- pcre install
[root@hae src]# cd pcre-8.44/
[root@hae pcre-8.44]# ./configure --prefix=/usr/local/src/apr-util-1.6.1 --with-apr=/usr/local/src/apr-1.7.0
[root@hae pcre-8.44]# make && make install

- apache install
[root@hae src]# cd httpd-2.4.46/
[root@hae httpd-2.4.46]#./configure --prefix=/app/web/apache2 --enable-so --enable-rewrite --enable-proxy --enable-ssl --enable-mods-shared=all --enable-modules=shared --with-apr=/usr/local/src/apr-1.7.0 --with-apr-util=/usr/local/src/apr-util-1.6.1
[root@hae httpd-2.4.46]# make && make install

[root@hae install]# wget http://mirror.apache-kr.org/httpd/httpd-2.4.46.tar.gz

[root@hae install]# wget http://mirror.apache-kr.org/apr/apr-1.7.0.tar.gz

[root@hae install]# wget http://mirror.apache-kr.org/apr/apr-util-1.6.1.tar.gz

[root@hae install]# wget https://sourceforge.net/projects/pcre/files/pcre/8.44/pcre-8.44.tar.gz

[root@hae install]# tar zxvf apr-1.7.0.tar.gz

[root@hae install]# tar zxvf apr-util-1.6.1.tar.gz

[root@hae install]# tar zxvf httpd-2.4.46.tar.gz

[root@hae install]# tar zxvf pcre-8.44.tar.gz

[root@hae install]# mv apr-1.7.0 apr-util-1.6.1 pcre-8.44 httpd-2.4.46 /usr/local/src

[root@hae install]# cd /usr/local/src/

[root@hae src]# ls

apr-1.7.0 apr-util-1.6.1 pcre-8.44

- apr install

[root@hae src]# cd apr-1.7.0/

[root@hae apr-1.7.0]# ./configure --prefix=/usr/local/src/apr-1.7.0

[root@hae apr-1.7.0]# make && make install

- apr-util install

[root@hae src]# cd apr-util-1.6.1/

[root@hae apr-util-1.6.1]# ./configure --prefix=/usr/local/src/apr-util-1.6.1 --with-apr=/usr/local/src/apr-1.7.0

[root@hae apr-util-1.6.1]# make && make install

- pcre install

[root@hae src]# cd pcre-8.44/

[root@hae pcre-8.44]# ./configure --prefix=/usr/local/src/apr-util-1.6.1 --with-apr=/usr/local/src/apr-1.7.0

[root@hae pcre-8.44]# make && make install

- apache install

[root@hae src]# cd httpd-2.4.46/

[root@hae httpd-2.4.46]#./configure --prefix=/app/web/apache2 --enable-so --enable-rewrite --enable-proxy --enable-ssl --enable-mods-shared=all --enable-modules=shared --with-apr=/usr/local/src/apr-1.7.0 --with-apr-util=/usr/local/src/apr-util-1.6.1

[root@hae httpd-2.4.46]# make && make install

작동확인 [root@hae bin]# cd /app/web/apache2/bin [root@hae bin]# ./apachectl start [root@hae bin]# netstat -tulpn | grep LISTEN tcp 0 0 0.0.0.0:7990 0.0.0.0:* LISTEN 9188/ssh tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1001/sshd tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 1595/master tcp 0 0 0.0.0.0:3389 […]

24 02 2021

Linux mount/umount

Haeng Ho Kang | OS, Linux/Unix

mount 확인후 할당

[root@test etc]# fdisk -l

Disk /dev/sdb: 256.1 GB, 256060514304 bytes, 500118192 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x00085ecd

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1            2048   500117503   250057728   83  Linux

Disk /dev/sdc: 2000.4 GB, 2000398934016 bytes, 3907029168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk label type: dos
Disk identifier: 0x0009f1b1

   Device Boot      Start         End      Blocks   Id  System
/dev/sdc1            2048  3907028991  1953513472   83  Linux

Disk /dev/sda: 256.1 GB, 256060514304 bytes, 500118192 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x0001e6f8

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     2099199     1048576   83  Linux
/dev/sda2         2099200   466563071   232231936   83  Linux
/dev/sda3       466563072   500117503    16777216   82  Linux swap / Solaris
[root@test etc]# df
Filesystem      1K-blocks    Used  Available Use% Mounted on
devtmpfs         16359468       0   16359468   0% /dev
tmpfs            16369908       0   16369908   0% /dev/shm
tmpfs            16369908  115444   16254464   1% /run
tmpfs            16369908       0   16369908   0% /sys/fs/cgroup
/dev/sda2       228455892 6355972  210471940   3% /
/dev/sdb1       246002848   60572  233423008   1% /backup1
/dev/sda1          999320  147456     783052  16% /boot
/dev/sdc1      1922728752 6486828 1818549868   1% /backup2
tmpfs             3273984       0    3273984   0% /run/user/0
[root@test etc]# vi /etc/fstab
[root@test etc]# umount /dev/sdc1
[root@test etc]# df
Filesystem     1K-blocks    Used Available Use% Mounted on
devtmpfs        16359468       0  16359468   0% /dev
tmpfs           16369908       0  16369908   0% /dev/shm
tmpfs           16369908  115444  16254464   1% /run
tmpfs           16369908       0  16369908   0% /sys/fs/cgroup
/dev/sda2      228455892 6355988 210471924   3% /
/dev/sdb1      246002848   60572 233423008   1% /backup1
/dev/sda1         999320  147456    783052  16% /boot
tmpfs            3273984       0   3273984   0% /run/user/0
[root@test etc]# mount /dev/sdc1 /app
mount: mount point /app does not exist
[root@test etc]# cd /
[root@test /]# mkdir app
[root@test /]# mount /dev/sdc1 /app

[root@test etc]# fdisk -l

Disk /dev/sdb: 256.1 GB, 256060514304 bytes, 500118192 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk label type: dos

Disk identifier: 0x00085ecd

Device Boot Start End Blocks Id System

/dev/sdb1 2048 500117503 250057728 83 Linux

Disk /dev/sdc: 2000.4 GB, 2000398934016 bytes, 3907029168 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 4096 bytes

I/O size (minimum/optimal): 4096 bytes / 4096 bytes

Disk label type: dos

Disk identifier: 0x0009f1b1

Device Boot Start End Blocks Id System

/dev/sdc1 2048 3907028991 1953513472 83 Linux

Disk /dev/sda: 256.1 GB, 256060514304 bytes, 500118192 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk label type: dos

Disk identifier: 0x0001e6f8

Device Boot Start End Blocks Id System

/dev/sda1 * 2048 2099199 1048576 83 Linux

/dev/sda2 2099200 466563071 232231936 83 Linux

/dev/sda3 466563072 500117503 16777216 82 Linux swap / Solaris

[root@test etc]# df

Filesystem 1K-blocks Used Available Use% Mounted on

devtmpfs 16359468 0 16359468 0% /dev

tmpfs 16369908 0 16369908 0% /dev/shm

tmpfs 16369908 115444 16254464 1% /run

tmpfs 16369908 0 16369908 0% /sys/fs/cgroup

/dev/sda2 228455892 6355972 210471940 3% /

/dev/sdb1 246002848 60572 233423008 1% /backup1

/dev/sda1 999320 147456 783052 16% /boot

/dev/sdc1 1922728752 6486828 1818549868 1% /backup2

tmpfs 3273984 0 3273984 0% /run/user/0

[root@test etc]# vi /etc/fstab

[root@test etc]# umount /dev/sdc1

[root@test etc]# df

Filesystem 1K-blocks Used Available Use% Mounted on

devtmpfs 16359468 0 16359468 0% /dev

tmpfs 16369908 0 16369908 0% /dev/shm

tmpfs 16369908 115444 16254464 1% /run

tmpfs 16369908 0 16369908 0% /sys/fs/cgroup

/dev/sda2 228455892 6355988 210471924 3% /

/dev/sdb1 246002848 60572 233423008 1% /backup1

/dev/sda1 999320 147456 783052 16% /boot

tmpfs 3273984 0 3273984 0% /run/user/0

[root@test etc]# mount /dev/sdc1 /app

mount: mount point /app does not exist

[root@test etc]# cd /

[root@test /]# mkdir app

[root@test /]# mount /dev/sdc1 /app

리부팅할경우도 마운트 유지 Auto mount (case restart) [root@test /]# vi /etc/fstab

# /etc/fstab
# Created by anaconda on Tue Feb 16 19:12:05 2021
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
UUID=44821e00-59a5-4d92-a1a8-10c9154cc5ca /                       ext4    defaults        1 1
UUID=fd18a2c6-d9b5-45ae-8050-80e600a161a8 /boot                   ext4    defaults        1 2
UUID=46b1cbd5-2d3d-43ac-891e-7484419ee4cb swap                    swap    defaults        0 0
/dev/sdb1                                 /backup1                ext4    defaults        2 1
/dev/sdc1                                 /app                    ext4    defaults        3 1
~

# /etc/fstab

# Created by anaconda on Tue Feb 16 19:12:05 2021

# Accessible filesystems, by reference, are maintained under '/dev/disk'

# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info

UUID=44821e00-59a5-4d92-a1a8-10c9154cc5ca / ext4 defaults 1 1

UUID=fd18a2c6-d9b5-45ae-8050-80e600a161a8 /boot ext4 defaults 1 2

UUID=46b1cbd5-2d3d-43ac-891e-7484419ee4cb swap swap defaults 0 0

/dev/sdb1 /backup1 ext4 defaults 2 1

/dev/sdc1 /app ext4 defaults 3 1

19 02 2021

Linux Centos 8 apache install

Haeng Ho Kang | OS, Server, Linux/Unix, Web

1) yum install httpd 2) 확인 [root@hae sbin]# httpd -version Server version: Apache/2.4.6 (CentOS) Server built: Nov 16 2020 16:18:20 3) 방화벽설정 [root@hae sbin]# firewall-cmd – -state running [root@hae conf]# firewall-cmd – -permanent – -add-service=http success [root@hae conf]# firewall-cmd – -permanent – -add-service=https success [root@hae conf]# firewall-cmd – -reload success [root@hae conf]# systemctl enable httpd […]

19 02 2021

Linux(CentOS) open java 8 install

Haeng Ho Kang | OS, Linux/Unix

1.java 확인 [root@hae bin]# which java /usr/bin/java 2.없을 경우 yum install [root@hae ~]# yum install java-1.8.0-openjdk 3.확인 [root@hae ~]# which java /usr/bin/java [root@hae ~]# cd /usr/bin [root@hae bin]# ls -al|grep java lrwxrwxrwx. 1 root root 26 Feb 19 19:25 alt-java -> /etc/alternatives/alt-java lrwxrwxrwx. 1 root root 22 Feb 19 19:25 java -> /etc/alternatives/java [root@hae bin]# […]

16 02 2021

Centos 7 mysql8 install

Haeng Ho Kang | DataBase, MySQL(MariaDB)

1)yum localinstall 명령어로 MySQL rpm 패키지 설치 [root@hae ~]# yum repolist enabled | grep “mysql.*-community.*” [root@hae ~]# sudo yum localinstall https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm Loaded plugins: fastestmirror mysql80-community-release-el7-3.noarch.rpm | 25 kB 00:00:00 Examining /var/tmp/yum-root-tl7kMk/mysql80-community-release-el7-3.noarch.rpm: mysql80-community-release-el7-3.noarch Marking /var/tmp/yum-root-tl7kMk/mysql80-community-release-el7-3.noarch.rpm to be installed Resolving Dependencies –> Running transaction check —> Package mysql80-community-release.noarch 0:el7-3 will be installed –> Finished Dependency Resolution Dependencies […]

15 02 2021

MS-SQL 축소

Haeng Ho Kang | DataBase, MS-SQL

ALTER DATABASE emudb SET RECOVERY SIMPLE DBCC SHRINKFILE(emudb_log) ALTER DATABASE emudb SET RECOVERY FULL ALTER DATABASE emudb SET RECOVERY SIMPLE DBCC SHRINKFILE(emudb) ALTER DATABASE emudb SET RECOVERY FULL

10 02 2021

Linux Centos 6 에 MySQL8 설치

Haeng Ho Kang | OS, DataBase, Linux/Unix, MySQL(MariaDB)

1) mysql 8.0 다운도르 rpm -Uvh https://repo.mysql.com/mysql80-community-release-el6-3.noarch.rpm 2)기존 받은 파일은 사용하지 않게 처리 sed -i ‘s/enabled=1/enabled=0/’ /etc/yum.repos.d/mysql-community.repo sed -i ‘s/enabled=1/enabled=0/’ /etc/yum.repos.d/mysql-community-source.repo 3)install yum –enablerepo=mysql80-community install mysql-community-server 4)Error Requires: libsasl2.so.3()(64bit) => yum whatprovides */libsasl2.so.3 Requires: libmysqlclient.so.16()(64bit) =>yum whatprovides */libmysqlclient.so.16 Requires: libstdc++.so.6(GLIBCXX_3.4.14)(64bit) =>yum whatprovides */libstdc++.so.6

10 02 2021

Linux mysql 삭제

Haeng Ho Kang | OS, DataBase, Linux/Unix, MySQL(MariaDB)

1.서비스 삭제 #chkconfig –list mysqld 2.등록한 서비스 파일 삭제 #cd /etc/init.d #rm -rf mysqld 3.설정정보삭제 # rm -rf /var/lib/mysql 4.yum 으로 설치 하지 않았다면 프로그램과 데이타파일을 직접 삭제한다.

10 02 2021

Linux Service 등록/삭제

Haeng Ho Kang | OS, Linux/Unix

서비스에 등록되어 있는 shell들은 #cd /etc/init.d 하면 확인 가능하다. chkconfig –list 를 하면 서비스에 등록한 프로그램들을 볼수 있습니다. #chkconfig –del tomcat 하면 서비스에서 삭제

3 02 2021

Apache Streaming Server Install

Haeng Ho Kang | Server, Media Server

아파치 mod_auth_token Module 설치 /app/httpd-2.2.27/bin

[root@hae install]#cd /app/install/
[root@hae install]# wget https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/mod-auth-token/mod_auth_token-1.0.5.tar.gz
[root@hae install]# tar -xvfz mod_auth_token-1.0.5.tar.gz 
[root@hae install]# cd mod_auth_token-1.0.5
[root@hae mod_auth_token-1.0.5]# rm -rf configure
[root@hae mod_auth_token-1.0.5]# autoreconf -fi
[root@hae mod_auth_token-1.0.5]#./configure --with-apxs=/app/httpd-2.2.27/bin/apxs
[root@hae mod_auth_token-1.0.5]# make
[root@hae mod_auth_token-1.0.5]# make install
[root@hae mod_auth_token-1.0.5]#cd /app/httpd-2.2.27/modules
[root@hae mod_auth_token-1.0.5]#ls
-rwxr-xr-x  1 root root   29782 Feb  3 16:35 mod_auth_token.so

[root@hae install]#cd /app/install/

[root@hae install]# wget https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/mod-auth-token/mod_auth_token-1.0.5.tar.gz

[root@hae install]# tar -xvfz mod_auth_token-1.0.5.tar.gz

[root@hae install]# cd mod_auth_token-1.0.5

[root@hae mod_auth_token-1.0.5]# rm -rf configure

[root@hae mod_auth_token-1.0.5]# autoreconf -fi

[root@hae mod_auth_token-1.0.5]#./configure --with-apxs=/app/httpd-2.2.27/bin/apxs

[root@hae mod_auth_token-1.0.5]# make

[root@hae mod_auth_token-1.0.5]# make install

[root@hae mod_auth_token-1.0.5]#cd /app/httpd-2.2.27/modules

[root@hae mod_auth_token-1.0.5]#ls

-rwxr-xr-x 1 root root 29782 Feb 3 16:35 mod_auth_token.so

위처럼 mod_auth_token.so 파일이 생성됩니다. httpd.conf에서도 mod_auth_token.so등록되어 있습니다. 아파치 H264 Module 설치 yum install gcc yum install httpd-devel

[root@hae conf]# cd /app/install/
[root@hae install]# wget http://h264.code-shop.com/download/apache_mod_h264_streaming-2.2.7.tar.gz
[root@hae install]# tar -zxvf apache_mod_h264_streaming-2.2.7.tar.gz
[root@hae install]# cd mod_h264_streaming-2.2.7/
[root@hae mod_h264_streaming-2.2.7]# ./configure --with-apxs=/app/httpd-2.2.27/bin/apxs
[root@hae mod_h264_streaming-2.2.7]# make
[root@hae mod_h264_streaming-2.2.7]# make install
[root@hae httpd-2.2.27]# cd /app/httpd-2.2.27/modules
[root@hae modules]# ls -al
-rwxr-xr-x  1 root root  277786 Feb  3 17:16 mod_h264_streaming.so

[root@hae conf]# cd /app/httpd-2.2.27/conf
[root@hae conf]# vi httpd.conf
   #Apache mod_h264 Streaming Server
    AddHandler h264-streaming.extensions .mp4

[root@hae conf]# cd /app/install/

[root@hae install]# wget http://h264.code-shop.com/download/apache_mod_h264_streaming-2.2.7.tar.gz

[root@hae install]# tar -zxvf apache_mod_h264_streaming-2.2.7.tar.gz

[root@hae install]# cd mod_h264_streaming-2.2.7/

[root@hae mod_h264_streaming-2.2.7]# ./configure --with-apxs=/app/httpd-2.2.27/bin/apxs

[root@hae mod_h264_streaming-2.2.7]# make

[root@hae mod_h264_streaming-2.2.7]# make install

[root@hae httpd-2.2.27]# cd /app/httpd-2.2.27/modules

[root@hae modules]# ls -al

-rwxr-xr-x 1 root root 277786 Feb 3 17:16 mod_h264_streaming.so

[root@hae conf]# cd /app/httpd-2.2.27/conf

[root@hae conf]# vi httpd.conf

#Apache mod_h264 Streaming Server

AddHandler h264-streaming.extensions .mp4

httpd.conf or extra/httpd-vhost.conf 편집한다.

<Location /downloads/>
# Secret key, can be anything random
 AuthTokenSecret "randomstring"
# directory to protect
 AuthTokenPrefix /downloads/
# Timeout length, this is in seconds
 AuthTokenTimeout 300
# limit requsts by IP
 AuthTokenLimitByIp off
</Location>

# Secret key, can be anything random

AuthTokenSecret "randomstring"

# directory to protect

AuthTokenPrefix /downloads/

# Timeout length, this is in seconds

AuthTokenTimeout 300

# limit requsts by IP

AuthTokenLimitByIp off

</Location>

Java 프로그램 구현 소스

String secret="randomstring";                    // Same as AuthTokenSecret 
String protectedPath="/downloads/";                   // Same as AuthTokenPrefix 
//boolean ipLimitation=false;                     // Same as AuthTokenLimitByIp 
long time= (new Date()).getTime();                // Time in decimal 
time=time/1000;                                   // timestamp of java is longer than PHP  
String hexTime =Long.toHexString(time);            // hexTime  in Hexadecimal   
String token =getMD5( (secret+ filePathName + hexTime).getBytes()); 
return protectedPath +token+"/"+hexTime+ filePathName; 
 
 
public String getMD5(byte[] source) { 
        String s = null; 
        char hexDigits[] = {  
        '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd',   'e', 'f' }; 
        try { 
                java.security.MessageDigest md = java.security.MessageDigest 
                                .getInstance("MD5"); 
                md.update(source); 
                byte tmp[] = md.digest(); 
                char str[] = new char[16 * 2]; 
                int k = 0;  
                for (int i = 0; i < 16; i++) {  
                        byte byte0 = tmp[i];  
                        str[k++] = hexDigits[byte0 >>> 4 & 0xf];  
                        str[k++] = hexDigits[byte0 & 0xf]; 
                } 
                s = new String(str);  
        } catch (Exception e) { 
                e.printStackTrace(); 
        } 
        return s; 
}

String secret="randomstring"; // Same as AuthTokenSecret

String protectedPath="/downloads/"; // Same as AuthTokenPrefix

//boolean ipLimitation=false; // Same as AuthTokenLimitByIp

long time= (new Date()).getTime(); // Time in decimal

time=time/1000; // timestamp of java is longer than PHP

String hexTime =Long.toHexString(time); // hexTime in Hexadecimal

String token =getMD5( (secret+ filePathName + hexTime).getBytes());

return protectedPath +token+"/"+hexTime+ filePathName;

public String getMD5(byte[] source) {

String s = null;

char hexDigits[] = {

'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };

try {

java.security.MessageDigest md = java.security.MessageDigest

.getInstance("MD5");

md.update(source);

byte tmp[] = md.digest();

char str[] = new char[16 * 2];

int k = 0;

for (int i = 0; i < 16; i++) {

byte byte0 = tmp[i];

str[k++] = hexDigits[byte0 >>> 4 & 0xf];

str[k++] = hexDigits[byte0 & 0xf];

}

s = new String(str);

} catch (Exception e) {

e.printStackTrace();

}

return s;

}