Go语言用Gin实现图书管理接口的实现示例

go get -u github.com/gin-gonic/gin

package main

import (
    "github.com/gin-gonic/gin"
    "net/http"
    "strconv"
)

// 图书结构体
type Book struct {
    ID     int    `json:"id"`
    Title  string `json:"title"`
    Author string `json:"author"`
}

var books = []Book{
    {ID: 1, Title: "Go语言实战", Author: "张三"},
    {ID: 2, Title: "Gin框架入门", Author: "李四"},
}

// 获取所有图书
func getBooks(c *gin.Context) {
    c.JSON(http.StatusOK, books)
}

// 根据ID获取图书
func getBookByID(c *gin.Context) {
    idStr := c.Param("id")
    id, _ := strconv.Atoi(idStr)

    for _, book := range books {
        if book.ID == id {
            c.JSON(http.StatusOK, book)
            return
        }
    }
    c.JSON(http.StatusNotFound, gin.H{"error": "图书不存在"})
}

// 添加图书
func addBook(c *gin.Context) {
    var newBook Book
    if err := c.ShouldBindJSON(&newBook); err != nil {
        c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
        return
    }

    // 模拟自增ID
    newBook.ID = len(books) + 1
    books = append(books, newBook)

    c.JSON(http.StatusCreated, newBook)
}

// 更新图书
func updateBook(c *gin.Context) {
    idStr := c.Param("id")
    id, _ := strconv.Atoi(idStr)

    var updateData Book
    if err := c.ShouldBindJSON(&updateData); err != nil {
        c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
        return
    }

    for i, book := range books {
        if book.ID == id {
            books[i].Title = updateData.Title
            books[i].Author = updateData.Author
            c.JSON(http.StatusOK, books[i])
            return
        }
    }
    c.JSON(http.StatusNotFound, gin.H{"error": "图书不存在"})
}

// 删除图书
func deleteBook(c *gin.Context) {
    idStr := c.Param("id")
    id, _ := strconv.Atoi(idStr)

    for i, book := range books {
        if book.ID == id {
            books = append(books[:i], books[i+1:]...)
            c.JSON(http.StatusOK, gin.H{"message": "删除成功"})
            return
        }
    }
    c.JSON(http.StatusNotFound, gin.H{"error": "图书不存在"})
}

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

    r.GET("/books", getBooks)
    r.GET("/books/:id", getBookByID)
    r.POST("/books", addBook)
    r.PUT("/books/:id", updateBook)
    r.DELETE("/books/:id", deleteBook)

    r.Run(":8080")
}

go run main.go

curl http://localhost:8080/books

curl http://localhost:8080/books/1

curl -X POST http://localhost:8080/books \
  -H "Content-Type: application/json" \
  -d '{"title":"Go Web编程","author":"王五"}'

curl -X PUT http://localhost:8080/books/1 \
  -H "Content-Type: application/json" \
  -d '{"title":"Go语言进阶","author":"张三改"}'

curl -X DELETE http://localhost:8080/books/2