golang常用代码块

1.打印

fmt.Println("asd")

2.字符串与int互转

strconv.Itoa(1) 转字符串strconv.Atoi("1")转int

3.格式化日期

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

4.睡眠

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

5.随机数

"math/rand"r := rand.New(rand.NewSource(time.Now().UnixNano()))r.Intn(100) //0-100随机数

6.tcp连接

"net"...        conn, err := net.Dial("tcp", "ipport")        if err != nil {            fmt.Println("连接服务端失败:", err.Error())            return        }        fmt.Println("已连接服务器")        defer conn.Close()        Client(conn,tcpData)...func Client(conn net.Conn,sms string) {    fmt.Println("要发送的消息:"+sms)    conn.Write([]byte(sms))    buf := make([]byte, 2)    c, err := conn.Read(buf)    if err != nil {        fmt.Println("读取服务器数据异常:", err.Error())    }    fmt.Println("服务器返回："+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.路径

wd,err := os.Getwd()

这是定位到源码的project级别，编译完成后也是执行脚本所在目录
这也是相对路径的位置

10.多goroutine间通信，channel使用

package mainimport (    "fmt"    "time")func Producer (queue chan<- int){//往channel里写入数据时触发    for i:= 0; i < 10; i++ {        queue <- i//写入        fmt.Println("create:", i)    }}func Consumer( queue <-chan int){//channel里读到数据时触发    for i :=0; i < 10; i++{        v := <- queue//写出        fmt.Println("receive:", v)    }}func main(){    queue := make(chan int, 88)    go Producer(queue)    go Consumer(queue)    time.Sleep(1e9) //让Producer与Consumer完成}

11.捕获异常退出,杀进程或者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("耗时:", timeEnd.Seconds())        fmt.Println("Got signal:", s)//interrupt