go gin增删改查上传文件下载文件

一、依赖

module maingo 1.15require (github.com/gin-contrib/static v0.0.0-20200916080430-d45d9a37d28egithub.com/gin-gonic/gin v1.6.3github.com/go-playground/validator/v10 v10.3.0 // indirectgithub.com/golang/protobuf v1.4.2 // indirectgithub.com/jinzhu/gorm v1.9.16github.com/json-iterator/go v1.1.10 // indirectgithub.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirectgithub.com/modern-go/reflect2 v1.0.1 // indirectgithub.com/ugorji/go v1.1.8 // indirectgolang.org/x/sys v0.0.0-20200918174421-af09f7315aff // indirectgoogle.golang.org/protobuf v1.25.0 // indirectgopkg.in/yaml.v2 v2.3.0 // indirect
)

二、代码

package main// import _ "github.com/jinzhu/gorm/dialects/postgres"
// import _ "github.com/jinzhu/gorm/dialects/sqlite"
// import _ "github.com/jinzhu/gorm/dialects/mssql"
//国内镜像 https://learnku.com/go/wikis/38122
import ("bytes""fmt""io""io/ioutil""log""net/http""os""time""github.com/gin-gonic/gin""github.com/jinzhu/gorm"_ "github.com/jinzhu/gorm/dialects/mysql"
)//变量
var (Database *gorm.DB
)//变量
var _ = log.Printftype Book struct {ID   int    // 列名为 `id`Name string `gorm:"size:255"` // 列名为 `name`Port int    // 列名为 `port`
}func init() {//创建一个数据库的连接var err errordb, err := gorm.Open("mysql", "root:123456@tcp(127.0.0.1:3306)/test?charset=utf8")db.SingularTable(true)if err != nil {panic("failed to connect database")}//迁移the schemadb.AutoMigrate(&Book{})Database = db
}//启动
func main() {router := gin.Default()router.POST("/book", creatBook)router.GET("/books", fetchAllBooks)router.GET("/book/:id", updateBook)router.PUT("/book/:id", fetchSingleBook)router.DELETE("/book/:id", deleteBook)router.POST("/upload_file", HandleUploadFile)router.POST("/upload_muti_file", HandleUploadMutiFile)router.GET("/download", HandleDownloadFile)router.GET("/getUrl", Get)router.Run(":7001")
}// 查询所有
func fetchAllBooks(c *gin.Context) {var dataList []BookDatabase.Find(&dataList)if len(dataList) <= 0 {c.JSON(http.StatusNotFound, gin.H{"status": -1, "result": nil, "message": "No todo found!"})return}c.JSON(200, gin.H{"status": 1, "result": dataList, "message": "Success"})
}//查询
func fetchSingleBook(c *gin.Context) {var data Bookid := c.Param("id")Database.First(&data, id)err := c.ShouldBind(&data)if err != nil {c.JSON(200, gin.H{"status": -1, "result": nil, "message": err.Error()})} else {if data.ID == 0 {c.JSON(http.StatusNotFound, gin.H{"status": http.StatusNotFound, "result": nil, "message": "No todo found!"})return}Database.Model(&data).Updates(&data)c.JSON(200, gin.H{"status": 1, "result": data, "message": "Success"})}}//更新
func updateBook(c *gin.Context) {var data Bookid := c.Param("id")Database.First(&data, id)if data.ID == 0 {c.JSON(http.StatusNotFound, gin.H{"status": http.StatusNotFound, "result": nil, "message": "No todo found!"})return}Database.Model(&data).Updates(&data)c.JSON(200, gin.H{"status": 1, "result": data, "message": "Success"})
}//创建
func creatBook(c *gin.Context) {var book Bookerr := c.ShouldBind(&book)if err != nil {c.JSON(200, gin.H{"status": -1, "result": nil, "message": err.Error()})} else {Database.Save(&book)c.JSON(200, gin.H{"status": 1, "result": book, "message": "Success"})}
}//删除
func deleteBook(c *gin.Context) {var data BooktodoID := c.Param("id")Database.First(&data, todoID)if data.ID == 0 {c.JSON(http.StatusNotFound, gin.H{"status": http.StatusNotFound, "message": "No todo found!"})return}Database.Delete(&data)c.JSON(200, gin.H{"status": 1, "result": data, "message": "Success"})
}//错误
func handleError(err error) {fmt.Println("Error:", err)os.Exit(-1)
}// 发送GET请求
// url：         请求地址
// response：    请求返回的内容
func Get(c *gin.Context) {url := c.Param("url")// 超时时间：5秒client := &http.Client{Timeout: 5 * time.Second}resp, err := client.Get(url)if err != nil {panic(err)}defer resp.Body.Close()var buffer [512]byteresult := bytes.NewBuffer(nil)for {n, err := resp.Body.Read(buffer[0:])result.Write(buffer[0:n])if err != nil && err == io.EOF {break} else if err != nil {panic(err)}}c.JSON(200, gin.H{"status": 1, "result": result.String(), "message": "Success"})
}// HandleUploadFile 上传单个文件
func HandleUploadFile(c *gin.Context) {file, header, err := c.Request.FormFile("file")if err != nil {c.JSON(http.StatusBadRequest, gin.H{"msg": "文件上传失败"})return}content, err := ioutil.ReadAll(file)if err != nil {c.JSON(http.StatusBadRequest, gin.H{"msg": "文件读取失败"})return}fmt.Println(header.Filename)fmt.Println(string(content))c.JSON(http.StatusOK, gin.H{"msg": "上传成功"})
}// HandleUploadMutiFile 上传多个文件
func HandleUploadMutiFile(c *gin.Context) {// 限制上传文件大小c.Request.Body = http.MaxBytesReader(c.Writer, c.Request.Body, 4<<20)// 限制放入内存的文件大小err := c.Request.ParseMultipartForm(4 << 20)if err != nil {c.JSON(http.StatusBadRequest, gin.H{"msg": "文件读取失败"})return}formdata := c.Request.MultipartFormfiles := formdata.File["file"]for _, v := range files {file, err := v.Open()if err != nil {c.JSON(http.StatusBadRequest, gin.H{"msg": "文件读取失败"})return}defer file.Close()content, err := ioutil.ReadAll(file)if err != nil {c.JSON(http.StatusBadRequest, gin.H{"msg": "文件读取失败"})return}fmt.Println(v.Filename)fmt.Println(string(content))}c.JSON(http.StatusOK, gin.H{"msg": "上传成功"})
}// HandleDownloadFile 下载文件
func HandleDownloadFile(c *gin.Context) {content := c.Query("content")content = "hello world, 我是一个文件，" + contentc.Writer.WriteHeader(http.StatusOK)c.Header("Content-Disposition", "attachment; filename=hello.txt")c.Header("Content-Type", "application/text/plain")c.Header("Accept-Length", fmt.Sprintf("%d", len(content)))c.Writer.Write([]byte(content))
}

三、sql脚本

DROP TABLE IF EXISTS `book`;
CREATE TABLE `book` (`id` int(11) NOT NULL AUTO_INCREMENT,`name` varchar(255) COLLATE utf8_bin DEFAULT NULL,`port` int(255) DEFAULT NULL,PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8 COLLATE=utf8_bin;

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