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// 用户结构体
type User struct {
ID string `json:"id"`
Name string `json:"name"`
Age int `json:"age"`
}
// 模拟数据库
var users = map[string]User{
"1": {ID: "1", Name: "张三", Age: 30},
"2": {ID: "2", Name: "李四", Age: 25},
}
func main() {
// 使用ServeMux路由
mux := http.NewServeMux()
// 注册路由
mux.HandleFunc("/users", getUsers)
mux.HandleFunc("/users/", getUser)
mux.HandleFunc("/users/create", createUser)
mux.HandleFunc("/users/update/", updateUser)
mux.HandleFunc("/users/delete/", deleteUser)
// 添加CORS中间件
handler := corsMiddleware(mux)
// 启动服务器
fmt.Println("REST API服务器启动，监听端口 8080...")
http.ListenAndServe(":8080", handler)
}
// 获取所有用户
func getUsers(w http.ResponseWriter, r *http.Request) {
if r.Method != "GET" {
w.WriteHeader(http.StatusMethodNotAllowed)
return
}
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(users)
}
// 获取单个用户
func getUser(w http.ResponseWriter, r *http.Request) {
if r.Method != "GET" {
w.WriteHeader(http.StatusMethodNotAllowed)
return
}
// 提取用户ID
id := strings.TrimPrefix(r.URL.Path, "/users/")
if id == "" {
w.WriteHeader(http.StatusBadRequest)
json.NewEncoder(w).Encode(map[string]string{"error": "缺少用户ID"})
return
}
user, exists := users[id]
if !exists {
w.WriteHeader(http.StatusNotFound)
json.NewEncoder(w).Encode(map[string]string{"error": "用户不存在"})
return
}
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(user)
}
// 创建用户
func createUser(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
w.WriteHeader(http.StatusMethodNotAllowed)
return
}
var newUser User
if err := json.NewDecoder(r.Body).Decode(&newUser); err != nil {
w.WriteHeader(http.StatusBadRequest)
json.NewEncoder(w).Encode(map[string]string{"error": "无效的用户数据"})
return
}
// 简单生成ID
newID := fmt.Sprintf("%d", len(users)+1)
newUser.ID = newID
users[newID] = newUser
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(http.StatusCreated)
json.NewEncoder(w).Encode(newUser)
}
// 更新用户
func updateUser(w http.ResponseWriter, r *http.Request) {
if r.Method != "PUT" {
w.WriteHeader(http.StatusMethodNotAllowed)
return
}
id := strings.TrimPrefix(r.URL.Path, "/users/update/")
if id == "" {
w.WriteHeader(http.StatusBadRequest)
json.NewEncoder(w).Encode(map[string]string{"error": "缺少用户ID"})
return
}
if _, exists := users[id]; !exists {
w.WriteHeader(http.StatusNotFound)
json.NewEncoder(w).Encode(map[string]string{"error": "用户不存在"})
return
}
var updatedUser User
if err := json.NewDecoder(r.Body).Decode(&updatedUser); err != nil {
w.WriteHeader(http.StatusBadRequest)
json.NewEncoder(w).Encode(map[string]string{"error": "无效的用户数据"})
return
}
updatedUser.ID = id
users[id] = updatedUser
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(updatedUser)
}
// 删除用户
func deleteUser(w http.ResponseWriter, r *http.Request) {
if r.Method != "DELETE" {
w.WriteHeader(http.StatusMethodNotAllowed)
return
}
id := strings.TrimPrefix(r.URL.Path, "/users/delete/")
if id == "" {
w.WriteHeader(http.StatusBadRequest)
json.NewEncoder(w).Encode(map[string]string{"error": "缺少用户ID"})
return
}
if _, exists := users[id]; !exists {
w.WriteHeader(http.StatusNotFound)
json.NewEncoder(w).Encode(map[string]string{"error": "用户不存在"})
return
}
delete(users, id)
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(map[string]string{"message": "用户删除成功"})
}
// CORS中间件
func corsMiddleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS")
w.Header().Set("Access-Control-Allow-Headers", "Content-Type, Authorization")
if r.Method == "OPTIONS" {
w.WriteHeader(http.StatusOK)
return
}
next.ServeHTTP(w, r)
})
}
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