Go语言select语句用法示例

ch1 = make(chan string)
ch2 = make(chan string)
ch1 <- "server1"
ch2 <- "server1"
select {
    case i := <- ch1:
      fmt.Printf("从ch1读取了数据%d", i)
    case j := <- ch2:
      fmt.Printf("从ch2读取了数据%d", i)
    default:
      fmt.Printf("no action...", i)
}

func main(){
// 生产数据，将数据写入 channel 
  n1 := make(chan int)
    Go func() {
        i := 0
        for {
            time.Sleep(time.Duration(rand.Intn(1000)) * time.Millisecond)
            n1 <- i
            i++
        }
    }()
    n2 := make(chan int)
    go func() {
        i := 0
        for {
            time.Sleep(time.Duration(rand.Intn(1000)) * time.Millisecond)
            n2 <- i
            i++
        }
    }()
// 从 channel 中读取到数据就输出
    for {
        select {
        case n := <-n1:
            fmt.Printf("从ch1读取了数据%d", n)
        case n := <-n2:
            fmt.Printf("从ch1读取了数据%d", n)
        }
    }
}

select {}