1.打印

fmt.Println("asd")

2.字符串與int互轉(zhuǎn)

strconv.Itoa(1) 轉(zhuǎn)字符串
strconv.Atoi("1")轉(zhuǎn)int

3.格式化日期

time.Now().Format("20060102150405")

4.睡眠

time.Sleep(time.Duration(waitTime)*time.Second)

5.隨機(jī)數(shù)

"math/rand"
r := rand.New(rand.NewSource(time.Now().UnixNano()))
r.Intn(100) //0-100隨機(jī)數(shù)

6.tcp連接

"net"
...
        conn, err := net.Dial("tcp", "ipport")
        if err != nil {
            fmt.Println("連接服務(wù)端失敗:", err.Error())
            return
        }
        fmt.Println("已連接服務(wù)器")
        defer conn.Close()
        Client(conn,tcpData)
...
func Client(conn net.Conn,sms string) {
    fmt.Println("要發(fā)送的消息:"+sms)
    conn.Write([]byte(sms))
    buf := make([]byte, 2)
    c, err := conn.Read(buf)
    if err != nil {
        fmt.Println("讀取服務(wù)器數(shù)據(jù)異常:", err.Error())
    }
    fmt.Println("服務(wù)器返回："+string(buf[0:c]))

}

7.字符串分割

"strings"
...
strings.FieldsFunc(TOPIC["data"], split)
...

func split(s rune) bool {
    if s == ',' {
        return true
    }
    return false
}

8.字符串包含

"strings"
...
 fmt.Println(strings.Contains("seafood", "foo")) //true 

9.路徑

wd,err := os.Getwd()

這是定位到源碼的project級別，編譯完成后也是執(zhí)行腳本所在目錄
這也是相對路徑的位置

10.多goroutine間通信，channel使用

package main

import (
    "fmt"
    "time"
)
func Producer (queue chan<- int){//往channel里寫入數(shù)據(jù)時觸發(fā)
    for i:= 0; i < 10; i++ {
        queue <- i//寫入
        fmt.Println("create:", i)
    }
}
func Consumer( queue <-chan int){//channel里讀到數(shù)據(jù)時觸發(fā)
    for i :=0; i < 10; i++{
        v := <- queue//寫出
        fmt.Println("receive:", v)
    }
}
func main(){
    queue := make(chan int, 88)
    go Producer(queue)
    go Consumer(queue)
    time.Sleep(1e9) //讓Producer與Consumer完成
}

11.捕獲異常退出,殺進(jìn)程或者ctrl+c

        timeStart := time.Now()
    c := make(chan os.Signal, 1)
    signal.Notify(c, os.Interrupt, os.Kill)

    s := <-c
    timeEnd:=time.Now().Sub(timeStart)
    fmt.Println("耗時:", timeEnd.Seconds())
        fmt.Println("Got signal:", s)//interrupt