Go 语言基础教程：从语法到并发编程 前言Go 语言以简洁的语法、出色的并发模型和编译速度著称，在云原生和服务端开发领域占据重要地位。本文将系统介绍 Go 的核心语法和并发编程。一、环境与项目1.1 安装go version # go1.22.x # 设置国内代理 go env -w GOPROXY=https://goproxy.cn,direct go env -w GO111MODULE=on1.2 创建项目mkdir myapp && cd myapp go mod init github.com/yourname/myapp二、基础语法2.1 变量与类型package main import "fmt" func main() { var name string = "Go" var age int = 18 var score = 95.5 isReady := true x, y := 10, 20 fmt.Println(name, age, score, isReady, x, y) }2.2 结构体与方法type User struct { ID int Name string Age int } func (u User) Greet() string { return fmt.Sprintf("Hi, I am %s", u.Name) } func (u *User) SetAge(age int) { u.Age = age } func main() { u := User{ID: 1, Name: "张三", Age: 25} fmt.Println(u.Greet()) u.SetAge(26) fmt.Println(u.Age) }2.3 接口type Animal interface { Speak() string } type Dog struct{ Name string } type Cat struct{ Name string } func (d Dog) Speak() string { return d.Name + ": 汪汪!" } func (c Cat) Speak() string { return c.Name + ": 喵喵!" } func makeSpeak(a Animal) { fmt.Println(a.Speak()) } func main() { makeSpeak(Dog{"旺财"}) makeSpeak(Cat{"咪咪"}) }2.4 错误处理func divide(a, b float64) (float64, error) { if b == 0 { return 0, fmt.Errorf("division by zero") } return a / b, nil } func main() { result, err := divide(10, 0) if err != nil { fmt.Println("Error:", err) return } fmt.Println("Result:", result) }三、并发编程3.1 Goroutinefunc sayHello(name string) { fmt.Printf("Hello, %s!\n", name) } func main() { go sayHello("张三") go sayHello("李四") time.Sleep(time.Second) }3.2 Channelfunc main() { ch := make(chan string) go func() { ch <- "来自 goroutine 的消息" }() msg := <-ch fmt.Println(msg) }3.3 带缓冲的 Channelch := make(chan int, 3) ch <- 1 ch <- 2 ch <- 3 // ch <- 4 // 阻塞！缓冲区已满 fmt.Println(<-ch) // 13.4 select 多路复用func main() { ch1 := make(chan string) ch2 := make(chan string) go func() { time.Sleep(1 * time.Second) ch1 <- "来自 ch1" }() go func() { time.Sleep(2 * time.Second) ch2 <- "来自 ch2" }() select { case msg := <-ch1: fmt.Println(msg) case msg := <-ch2: fmt.Println(msg) } }3.5 WaitGroup 等待多个 goroutinefunc worker(id int, wg *sync.WaitGroup) { defer wg.Done() fmt.Printf("Worker %d started\n", id) time.Sleep(time.Second) fmt.Printf("Worker %d done\n", id) } func main() { var wg sync.WaitGroup for i := 1; i <= 5; i++ { wg.Add(1) go worker(i, &wg) } wg.Wait() fmt.Println("All workers done") }3.6 并发安全：Mutextype Counter struct { mu sync.Mutex count int } func (c *Counter) Increment() { c.mu.Lock() defer c.mu.Unlock() c.count++ } func (c *Counter) Value() int { c.mu.Lock() defer c.mu.Unlock() return c.count } func main() { c := &Counter{} var wg sync.WaitGroup for i := 0; i < 1000; i++ { wg.Add(1) go func() { defer wg.Done() c.Increment() }() } wg.Wait() fmt.Println("Final count:", c.Value()) }四、HTTP 服务func main() { http.HandleFunc("/api/hello", func(w http.ResponseWriter, r *http.Request) { w.Header().Set("Content-Type", "application/json") json.NewEncoder(w).Encode(map[string]string{ "msg": "Hello from Go!", }) }) fmt.Println("Server running on :8080") log.Fatal(http.ListenAndServe(":8080", nil)) }五、总结Go 的核心优势在于：语法简洁上手快、goroutine 轻量级并发、编译速度快、标准库强大。掌握 struct/interface/goroutine/channel 这四个核心概念，就能写出高质量的 Go 程序。建议在实际项目中配合 Gin/Echo 等 Web 框架和 GORM 等 ORM 框架，进一步提升开发效率。