Ketahui tentang lima pemalam paling popular di Golang: the big reveal

package main

import (
    "github.com/gin-gonic/gin"
    "github.com/appleboy/gin-jwt"
)

func main() {
    r := gin.Default()

    // 身份验证中间件
    authMiddleware, err := jwt.New(&jwt.GinJWTMiddleware{
        Realm:       "test zone",
        Key:         []byte("secret key"),
        Timeout:     time.Hour,
        MaxRefresh:  time.Hour,
        IdentityKey: "id",
        Authenticator: func(c *gin.Context) (interface{}, error) {
            var loginVals Login
            if err := c.ShouldBind(&loginVals); err != nil {
                return "", jwt.ErrMissingLoginValues
            }
            userID := loginVals.UserID
            password := loginVals.Password

            if (userID == "admin" && password == "admin") || (userID == "test" && password == "test") {
                return userID, nil
            }

            return nil, jwt.ErrFailedAuthentication
        },
        PayloadFunc: func(data interface{}) jwt.MapClaims {
            if v, ok := data.(string); ok {
                return jwt.MapClaims{"id": v}
            }
            return jwt.MapClaims{}
        },
        IdentityHandler: func(c *gin.Context) interface{} {
            claims := jwt.ExtractClaims(c)
            return claims["id"]
        },
    })

    if err != nil {
        log.Fatalf("Failed to create JWT middleware: %v", err)
    }

    // 使用身份验证中间件
    r.Use(authMiddleware.MiddlewareFunc())
    // 添加保护路由
    r.GET("/protected", authMiddleware.MiddlewareFunc(), func(c *gin.Context) {
        c.JSON(http.StatusOK, gin.H{"data": "protected"})
    })

    // 启动服务器
    if err := r.Run(":8080"); err != nil {
        log.Fatal("Failed to start server: ", err)
    }
}

package main

import (
    "log"

    "github.com/spf13/cobra"
)

func main() {
    rootCmd := &cobra.Command{
        Use:   "myapp",
        Short: "A simple CLI application",
        Run: func(cmd *cobra.Command, args []string) {
            // 执行应用程序的主要逻辑
            log.Println("Hello, Gopher!")
        },
    }

    // 添加子命令
    rootCmd.AddCommand(&cobra.Command{
        Use:   "greet",
        Short: "Greet the user",
        Run: func(cmd *cobra.Command, args []string) {
            log.Println("Hello, " + args[0])
        },
    })

    // 启动命令行应用程序
    if err := rootCmd.Execute(); err != nil {
        log.Fatal("Failed to start CLI application: ", err)
    }
}

package main

import (
    "log"

    "gorm.io/driver/mysql"
    "gorm.io/gorm"
)

type User struct {
    ID   uint
    Name string
    Age  int
}

func main() {
    dsn := "username:password@tcp(127.0.0.1:3306)/dbname?charset=utf8mb4&parseTime=True&loc=Local"
    db, err := gorm.Open(mysql.Open(dsn), &gorm.Config{})
    if err != nil {
        log.Fatal("Failed to connect database: ", err)
    }

    // 迁移数据表
    err = db.AutoMigrate(&User{})
    if err != nil {
        log.Fatal("Failed to migrate database: ", err)
    }

    // 创建用户
    user := User{Name: "Alice", Age: 18}
    result := db.Create(&user)
    if result.Error != nil {
        log.Fatal("Failed to create user: ", result.Error)
    }
    log.Println("Created user:", user)

    // 查询用户
    var users []User
    result = db.Find(&users)
    if result.Error != nil {
        log.Fatal("Failed to query users: ", result.Error)
    }
    log.Println("Users:", users)
}

package main

import (
    "log"

    "github.com/spf13/viper"
)

func main() {
    viper.SetConfigFile("config.json")
    err := viper.ReadInConfig()
    if err != nil {
        log.Fatal("Failed to read config file: ", err)
    }

    data := viper.GetString("data")
    log.Println("Data:", data)

    dbHost := viper.GetString("database.host")
    dbPort := viper.GetInt("database.port")
    dbUser := viper.GetString("database.user")
    dbPassword := viper.GetString("database.password")
    log.Println("Database:", dbHost, dbPort, dbUser, dbPassword)
}

package main

import (
    "log"

    "github.com/joho/godotenv"
)

func main() {
    err := godotenv.Load(".env")
    if err != nil {
        log.Fatal("Failed to load .env file: ", err)
    }

    dbHost := os.Getenv("DB_HOST")
    dbPort := os.Getenv("DB_PORT")
    dbUser := os.Getenv("DB_USER")
    dbPassword := os.Getenv("DB_PASSWORD")
    log.Println("Database:", dbHost, dbPort, dbUser, dbPassword)
}