初始化Go学习项目

go-gin-demo/user_manager.go

@@ -0,0 +1,114 @@
+package main
+
+import (
+	"fmt"
+	"github.com/gin-gonic/gin"
+	"net/http"
+)
+
+// 用户结构体
+type User struct {
+	ID    int    `json:"id"`
+	Name  string `json:"name" binding:"required"`
+	Email string `json:"email" binding:"required,email"`
+}
+
+// 内存存储（实战应使用数据库）
+var users = []User{
+	{ID: 1, Name: "Alice", Email: "alice@example.com"},
+	{ID: 2, Name: "Bob", Email: "bob@example.com"},
+}
+
+var nextID = 3
+
+// 获取所有用户
+func listUsers(c *gin.Context) {
+	c.JSON(http.StatusOK, users)
+}
+
+// 获取单个用户
+func getUser(c *gin.Context) {
+	id := c.Param("id")
+	for _, user := range users {
+		if user.ID == intParam(id) {
+			c.JSON(http.StatusOK, user)
+			return
+		}
+	}
+	c.JSON(http.StatusNotFound, gin.H{"error": "User not found"})
+}
+
+// 创建用户
+func createUser(c *gin.Context) {
+	var user User
+	if err := c.ShouldBindJSON(&user); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	user.ID = nextID
+	nextID++
+	users = append(users, user)
+	c.JSON(http.StatusCreated, user)
+}
+
+// 更新用户
+func updateUser(c *gin.Context) {
+	id := c.Param("id")
+	var user User
+
+	if err := c.ShouldBindJSON(&user); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	for i, u := range users {
+		if u.ID == intParam(id) {
+			user.ID = u.ID
+			users[i] = user
+			c.JSON(http.StatusOK, user)
+			return
+		}
+	}
+	c.JSON(http.StatusNotFound, gin.H{"error": "User not found"})
+}
+
+// 删除用户
+func deleteUser(c *gin.Context) {
+	id := c.Param("id")
+	for i, user := range users {
+		if user.ID == intParam(id) {
+			users = append(users[:i], users[i+1:]...)
+			c.JSON(http.StatusNoContent, nil)
+			return
+		}
+	}
+	c.JSON(http.StatusNotFound, gin.H{"error": "User not found"})
+}
+
+// 辅助函数
+func intParam(s string) int {
+	var i int
+	fmt.Sscanf(s, "%d", &i)
+	return i
+}
+
+func main() {
+	gin.SetMode(gin.ReleaseMode)
+	r := gin.Default()
+
+	// API 分组
+	api := r.Group("/api")
+	{
+		users := api.Group("/users")
+		{
+			users.GET("", listUsers)
+			users.POST("", createUser)
+			users.GET("/:id", getUser)
+			users.PUT("/:id", updateUser)
+			users.DELETE("/:id", deleteUser)
+		}
+	}
+
+	r.Run(":9999")
+}