Go Web 开发核心理论：HTTP、MySQL 与常用组件 | 极客日志

Go Web 开发核心理论：HTTP、MySQL 与常用组件 | 极客日志

import (
	_ "github.com/go-sql-driver/mysql"
	"github.com/jmoiron/sqlx"
)

// 核心两步
DB, err := sqlx.Open("mysql", "root:1234@tcp(localhost:3306)/goweb?parseTime=true&loc=Local")
if err != nil {
	log.Fatal(err)
}
err = DB.Ping()

// 定义语句
queryCreate := "insert into user (id, name) values (?, ?)"
queryDelete := "delete from user where id = ?"
queryUpdate := "update user set name = ? where id = ?"
queryQuery := "select * from user"

// 执行增
_, err := DB.Exec(queryCreate, 1, "白小纯")

// 执行删
_, err = DB.Exec(queryDelete, 1)

// 执行改
_, err = DB.Exec(queryUpdate, "夜藏", 1)

// 执行查
rows, err := DB.Query(queryQuery)
for rows.Next() {
	var id int
	var name string
	rows.Scan(&id, &name)
}

func serv(w http.ResponseWriter, r *http.Request) {
	// 设置 Cookie
	cookie := &http.Cookie{
		Name:  "session_id",
		Value: "cookie_value",
		Expires: time.Now().Add(time.Hour),
	}
	http.SetCookie(w, cookie)

	// 获取单个 Cookie
	c, err := r.Cookie("session_id")
	if err == nil {
		fmt.Fprintln(w, c.Name, c.Value)
	}

	// 循环获取所有 Cookie
	cs := r.Cookies()
	for _, co := range cs {
		fmt.Fprintln(w, co.Name)
	}
}

// 后端界面渲染
func temp(w http.ResponseWriter, r *http.Request) {
	add := template.FuncMap{"add": AddFunc}
	t := template.New("index").Funcs(add)
	t.ParseFiles("new_add.html")
	t.Execute(w, nil)
}

{{add 0 0}}

<form action="/upload" enctype="multipart/form-data" method="post">
    上传照片：<input type="file" name="photo">
</form>

func upload(w http.ResponseWriter, r *http.Request) {
	f, _, _ := r.FormFile("photo")
	b, _ := io.ReadAll(f)
	err := os.WriteFile("./uploads/photo.jpg", b, 0777)
	if err != nil {
		fmt.Println("上传失败")
	}
}

<a href="/download?filename=file.png">点击下载</a>

func download(w http.ResponseWriter, r *http.Request) {
	name := r.FormValue("filename")
	data, _ := os.ReadFile("./files/" + name)
	h := w.Header()
	h.Set("Content-Type", "application/octet-stream")
	h.Set("Content-Disposition", `attachment; filename="photo"`)
	w.Write(data)
}

type myStruct struct{}

func (m myStruct) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	// 统一处理逻辑
}

func main() {
	s := http.Server{
		Addr:    "localhost:8888",
		Handler: myStruct{},
	}
	s.ListenAndServe()
}

func Test(w http.ResponseWriter, r *http.Request) {
	// 处理特定 URL
}

func main() {
	s := http.Server{Addr: "localhost:8888"}
	http.HandleFunc("/url", Test)
	s.ListenAndServe()
}