What type of programs can be written using Go language?

The Go language can be used to write various types of applications, such as network applications (web servers, APIs, microservices), command line tools (system management scripts, data handlers, testing tools) and concurrent applications (distribution systems, message queues, data stream processing programs).

Write various types of programs using the Go programming language

Go is a general-purpose programming language that can be used to write various types of applications. Here are some of the most common types of programs written in Go:

1. Web Applications

Go is great for writing web applications such as web servers, APIs, and microservices. Serve. Its concurrency and memory management features make it ideal for handling high traffic and handling many connections simultaneously.

Example: Build a simple HTTP server using the Echo framework

package main

import (
    "fmt"
    "log"
    "net/http"

    "github.com/labstack/echo/v4"
)

func main() {
    e := echo.New()

    e.GET("/", func(c echo.Context) error {
        return c.String(http.StatusOK, "Hello, World!")
    })

    fmt.Println("Server started on port 8080")
    log.Fatal(e.Start(":8080"))
}

2. Command line tool

Go is also very Suitable for writing command line tools such as system administration scripts, data processing programs, and testing tools. Its simplicity and ease of use make it ideal for writing efficient and easy-to-use command line programs.

Example:Write a simple calculator command line tool

package main

import (
    "fmt"
    "os"
    "strconv"
    "strings"
)

func main() {
    if len(os.Args) != 4 {
        fmt.Println("Usage: calculator <operand 1> <operator> <operand 2>")
        os.Exit(1)
    }

    op1, err := strconv.ParseFloat(os.Args[1], 64)
    if err != nil {
        fmt.Println("Invalid operand 1:", err)
        os.Exit(1)
    }
    op2, err := strconv.ParseFloat(os.Args[3], 64)
    if err != nil {
        fmt.Println("Invalid operand 2:", err)
        os.Exit(1)
    }

    switch os.Args[2] {
    case "+":
        fmt.Println(op1 + op2)
    case "-":
        fmt.Println(op1 - op2)
    case "*":
        fmt.Println(op1 * op2)
    case "/":
        if op2 == 0 {
            fmt.Println("Division by zero is undefined")
            os.Exit(1)
        }
        fmt.Println(op1 / op2)
    default:
        fmt.Println("Invalid operator:", os.Args[2])
        os.Exit(1)
    }

    os.Exit(0)
}

3. Concurrent applications

Concurrency of Go and channel capabilities make it ideal for writing concurrent applications such as distributed systems, message queues, and data flow handlers.

Example: Use Goroutines to write a simple concurrent echo server

package main

import (
    "fmt"
    "net"
    "time"
)

func main() {
    listener, err := net.Listen("tcp", ":8080")
    if err != nil {
        fmt.Println("Error listening:", err)
        return
    }
    for {
        conn, err := listener.Accept()
        if err != nil {
            fmt.Println("Error accepting connection:", err)
            continue
        }
        go handleConnection(conn)
    }
}

func handleConnection(conn net.Conn) {
    defer conn.Close()
    for {
        data := make([]byte, 1024)
        n, err := conn.Read(data)
        if err != nil {
            fmt.Println("Error reading from connection:", err)
            return
        }
        if n == 0 {
            fmt.Println("Connection closed by client")
            return
        }
        fmt.Println("Data received:", string(data[:n]))
        time.Sleep(100 * time.Millisecond)
        conn.Write([]byte(fmt.Sprintf("Echo: %s", data[:n])))
    }
}

The above is the detailed content of What type of programs can be written using Go language?. For more information, please follow other related articles on the PHP Chinese website!