Golang分页实现：Query参数与切片解析

page, _ := strconv.Atoi(r.URL.Query().Get("page"))
if page  100 {
    limit = 10
}

start := (page - 1) * limit
if start >= len(data) {
    data = []Item{} // 页码超出范围，返回空切片
} else {
    end := start + limit
    if end > len(data) {
        end = len(data)
    }
    data = data[start:end]
}

type PaginatedResponse struct {
    Data       []Item `json:"data"`
    Page       int    `json:"page"`
    Limit      int    `json:"limit"`
    Total      int    `json:"total"`
    TotalPages int    `json:"total_pages"`
}

func listItemsHandler(w http.ResponseWriter, r *http.Request) {
    // 假设 items 是你的原始数据（例如从内存/JSON/轻量 DB 获取）
    items := getItems() // []Item
page, _ := strconv.Atoi(r.URL.Query().Get("page"))
if page < 1 { page = 1 }
limit, _ := strconv.Atoi(r.URL.Query().Get("limit"))
if limit < 1 || limit > 100 { limit = 10 }

start := (page - 1) * limit
total := len(items)

var paged []Item
if start < total {
    end := start + limit
    if end > total {
        end = total
    }
    paged = items[start:end]
}

totalPages := (total + limit - 1) / limit
json.NewEncoder(w).Encode(PaginatedResponse{
    Data:       paged,
    Page:       page,
    Limit:      limit,
    Total:      total,
    TotalPages: totalPages,
})
}