linux安装MySQL报 error while loading shared libraries: libtinfo.so.5 解决办法
MySQL 我采用的是 Linux- Generic 包安装，其中详细略过不表。一顿操作之后，终于到将 mysql 服务启动。但是到了连接服务的时候却报错了。
mysql: error while loading shared libraries: libtinfo.so.5: cannot open shared object file: No such file or directory
解决办法：
sudo ln -s /usr/lib64/libtinfo.so.6.1 /usr/lib64/libtinfo.so.5
安装准备
安装依赖组件:
gcc openssl-devel pcre-devel zlib-devel
，--这个能执行就执行
命令:
yum install gcc openssl-devel pcre-devel zlib-devel -y
tengine下载地址
http://tengine.taobao.org/
安装位置
一般为/usr/local下面,新建 tengine文件夹
编译
解压上传的tengine安装包,因为nginx是基于C语言开发的,所以首先要将解压后的源码编译,进入到tengine目录,使用./configure --prefix=/安装目录命令编译,如下图显示,在tengine里面执行
默认
./configure --prefix=/usr/local/tengine
安装
使用make && make install命令,对源码进行安装
配置Tengine服务启动脚本
添加Tengine启动脚本文件nginx到/etc/init.d/这个文件目录下,文件内容如下
#!/bin/sh
#
# nginx - this script starts and stops the nginx daemon
#
# chkconfig: - 85 15
# description: Nginx is an HTTP(S) server, HTTP(S) reverse \
# proxy and IMAP/POP3 proxy server
# processname: nginx
# config: /etc/nginx/nginx.conf
# config: /etc/sysconfig/nginx
# pidfile: /var/run/nginx.pid
# Source function library.
. /etc/rc.d/init.d/functions
# Source networking configuration.
. /etc/sysconfig/network
# Check that networking is up.
[ "$NETWORKING" = "no" ] && exit 0
# 注意:这里需要修改为自己的tengine安装牡蛎
nginx="/usr/local/tengine/sbin/nginx"
prog=$(basename $nginx)
NGINX_CONF_FILE="/usr/local/tengine/conf/nginx.conf"
[ -f /etc/sysconfig/nginx ] && . /etc/sysconfig/nginx
lockfile=/var/lock/subsys/nginx
make_dirs() {
# make required directories
user=`nginx -V 2>&1 | grep "configure arguments:" | sed 's/[^*]*--user=\([^ ]*\).*/\1/g' -`
options=`$nginx -V 2>&1 | grep 'configure arguments:'`
for opt in $options; do
if [ `echo $opt | grep '.*-temp-path'` ]; then
value=`echo $opt | cut -d "=" -f 2`
if [ ! -d "$value" ]; then
# echo "creating" $value
mkdir -p $value && chown -R $user $value
fi
fi
done
}
start() {
[ -x $nginx ] || exit 5
[ -f $NGINX_CONF_FILE ] || exit 6
make_dirs
echo -n $"Starting $prog: "
daemon $nginx -c $NGINX_CONF_FILE
retval=$?
echo
[ $retval -eq 0 ] && touch $lockfile
return $retval
}
stop() {
echo -n $"Stopping $prog: "
killproc $prog -QUIT
retval=$?
echo
[ $retval -eq 0 ] && rm -f $lockfile
return $retval
}
restart() {
configtest || return $?
stop
sleep 1
start
}
reload() {
configtest || return $?
echo -n $"Reloading $prog: "
killproc $nginx -HUP
RETVAL=$?
echo
}
force_reload() {
restart
}
configtest() {
$nginx -t -c $NGINX_CONF_FILE
}
rh_status() {
status $prog
}
rh_status_q() {
rh_status >/dev/null 2>&1
}
case "$1" in
start)
rh_status_q && exit 0
$1
;;
stop)
rh_status_q || exit 0
$1
;;
restart|configtest)
$1
;;
reload)
rh_status_q || exit 7
$1
;;
force-reload)
force_reload
;;
status)
rh_status
;;
condrestart|try-restart)
rh_status_q || exit 0
;;
*)
echo $"Usage: $0 {start|stop|status|restart|condrestart|try-restart|reload|force-reload|configtest}"
exit 2
esac
修改启动权限
chmod 777 nginx
启动服务
service nginx start启动服务
service nginx stop停止
service nginx status状态
service nginx reload动态重载配置文件
yum install coreutils
执行命令
在转换一个JSON转Java对象是 idea 编译不通过 提示：Error:(24, 35) java: 常量字符串过长
File -> Settings -> Build,Execution,Deployment -> Compiler -> Java
Compiler ， Use Compiler, 选择Eclipse , 点击 Apply
就行了
方法2
常量字符串过长的处理办法
背景：准备分析一个长字符串。
一、先把这段文本复制下来，然后赋给变量str
String str = 复制的文本；
String[] parts = str.split(",");
System.out.println(parts.length);
执行，报错了：
常量字符串过长
二、原来常量字符串的长度不能长于65535 - 1字节；
而我的文本长度达到了10W+字节，怎么办呢？
StringBuilder sb = new StringBuilder();
sb.append(文本的一半);
sb.append(文本剩下的一半);
String str = sb.toString();
String[] parts = str.split(",");
System.out.println(parts.length);
再执行，顺利通过。
上善若水，水利万物而不争。
public class Main {
private static int THREAD_COUNT = 10;
private static int ITEM_COUNT = 1000;
private static ConcurrentHashMap<String, Long> getData(int count) {
return LongStream.rangeClosed(1, count)
.boxed().collect(Collectors.toConcurrentMap(i-> UUID.randomUUID().toString(), Function.identity(),(t1, t2)->t1,ConcurrentHashMap::new));
}
public static void main(String[] args) throws InterruptedException {
ConcurrentHashMap<String, Long> stringLongConcurrentHashMap = getData(ITEM_COUNT-100);
System.out.println("init siez:"+stringLongConcurrentHashMap.size());
ForkJoinPool forkJoinPool = new ForkJoinPool(THREAD_COUNT);
forkJoinPool.execute(()-> IntStream.rangeClosed(1,10).parallel().forEach(i->{
int gap=ITEM_COUNT-stringLongConcurrentHashMap.size();
System.out.println("gap siez:"+gap);
stringLongConcurrentHashMap.putAll(getData(gap));
}));
forkJoinPool.shutdown();
forkJoinPool.awaitTermination(1, TimeUnit.HOURS);
System.out.println("finish siez:"+stringLongConcurrentHashMap.size());
}
}
上面没添加锁输出以下结果
init siez:900
gap siez:100
gap siez:100
gap siez:100
gap siez:100
gap siez:100
gap siez:100
gap siez:100
gap siez:100
gap siez:100
gap siez:100
finish siez:1900
添加锁之后
public class Main {
private static int THREAD_COUNT = 10;
private static int ITEM_COUNT = 1000;
private static ConcurrentHashMap<String, Long> getData(int count) {
return LongStream.rangeClosed(1, count)
.boxed().collect(Collectors.toConcurrentMap(i-> UUID.randomUUID().toString(), Function.identity(),(t1, t2)->t1,ConcurrentHashMap::new));
}
public static void main(String[] args) throws InterruptedException {
ConcurrentHashMap<String, Long> stringLongConcurrentHashMap = getData(ITEM_COUNT-100);
System.out.println("init siez:"+stringLongConcurrentHashMap.size());
ForkJoinPool forkJoinPool = new ForkJoinPool(THREAD_COUNT);
forkJoinPool.execute(()-> IntStream.rangeClosed(1,10).parallel().forEach(i->{
synchronized (stringLongConcurrentHashMap){
int gap=ITEM_COUNT-stringLongConcurrentHashMap.size();
System.out.println("gap siez:"+gap);
stringLongConcurrentHashMap.putAll(getData(gap));
}
}));
forkJoinPool.shutdown();
forkJoinPool.awaitTermination(1, TimeUnit.HOURS);
System.out.println("finish siez:"+stringLongConcurrentHashMap.size());
}
}
输出结果
init siez:900
gap siez:100
gap siez:0
gap siez:0
gap siez:0
gap siez:0
gap siez:0
gap siez:0
gap siez:0
gap siez:0
gap siez:0
finish siez:1000