hellokaton

public class UrlShortener {
//    private static final String ALPHABET = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
    private static final String ALPHABET = "mUSNcOa6hDgfnEJ1rGMPC03jv4k9RIqL2Yy7TQdH8xu5XFWwAKoZVstizlepBb";
    private static final int    BASE     = ALPHABET.length();

    public static String encode(int num) {
        StringBuilder sb = new StringBuilder();
        while (num > 0) {
            sb.append(ALPHABET.charAt(num % BASE));

hellokaton

import java.nio.ByteBuffer;
import java.util.Base64;
import java.util.UUID;
 
public class UUIDUtil {
 
    public static String shortUUID() {
        UUID uuid = UUID.randomUUID();
        return shortUUID(uuid);
    }

hellokaton

The Case For Go

• Iron.io: How We Went from 30 Servers to 2 with Go
• Go at Google: Language Design in the Service of Software Engineering
• Behind the Scenes: Big Data at Torbit
• pool.ntp.org DNS server in Go
• Juju at Canonical
• Go at bitly
• NSQ: realtime distributed message processing at scale

hellokaton

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.math.BigDecimal;
import java.text.SimpleDateFormat;
import java.util.Iterator;

import org.apache.poi.hssf.usermodel.HSSFCell;

hellokaton

import java.util.function.Function;

/**
 * @author biezhi
 * @date 2018/5/12
 */
public class Demo {

    public Function<String, Class> loader() {
        return Unchecked.function(Class::forName);

hellokaton

#!/bin/sh

#this is the prefix before the filename and can be anything you want
fileprefix='mysql_backup_';

#this is your mysql user - best to create a new mysql user called backup that has access to all databases
myuser='backup';

#your mysql password
mypass='s0mething$ecure123';

hellokaton

import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;

public class AsciiArt {

    public void drawString(String text, String artChar, Settings settings) {

hellokaton

package main

import (
  "crypto/tls"
  "fmt"
  "log"
  "net"
  "net/smtp"
)

hellokaton

提取音频

ffmpeg -i a.mp4 -f mp3 -vn a.mp3

提取视频

ffmpeg -i a.mp4 -vcodec copy -an b.mp4

hellokaton

使用ffmpeg合并MP4文件

ffmpeg -i "Apache Sqoop Tutorial Part 1.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate1.ts
ffmpeg -i "Apache Sqoop Tutorial Part 2.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate2.ts
ffmpeg -i "Apache Sqoop Tutorial Part 3.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate3.ts
ffmpeg -i "Apache Sqoop Tutorial Part 4.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate4.ts
ffmpeg -i "concat:intermediate1.ts|intermediate2.ts|intermediate3.ts|intermediate4.ts" -c copy -bsf:a aac_adtstoasc "Apache Sqoop Tutorial.mp4"