Golang实现Md5校验的代码示例

package main
 
import (
	"crypto/md5"
	"encoding/hex"
	"fmt"
	"io"
	"net/http"
	"os"
)
 
func main() {
	Md5ByLocalFile()
}
 
func Md5ByLocalFile() {
	// // 指定文件路径
	filePath := "d:/code/000fa28f-c114-49fe-9699-8c7f8b2eb222.png"
	// filePath := "https://minio.dev.inrobot.cloud/map/000fa28f-c114-49fe-9699-8c7f8b2eb222.png"
	// 打开文件
	file, err := os.Open(filePath)
	if err != nil {
		fmt.Println("Failed to open file:", err)
		return
	}
	defer file.Close()
 
	// 创建一个md5哈希对象
	hasher := md5.New()
 
	// 将文件内容读入哈希对象
	if _, err := io.Copy(hasher, file); err != nil {
		fmt.Println("Failed to read file:", err)
		return
	}
 
	// 计算并获取哈希值
	hashBytes := hasher.Sum(nil)
 
	// 将哈希值转换为十六进制字符串
	hashString := hex.EncodeToString(hashBytes)
 
	// 输出MD5哈希值
	fmt.Println("MD5 hash of the file:", hashString)
}

package main
 
import (
	"crypto/md5"
	"encoding/hex"
	"fmt"
	"io"
	"net/http"
	"os"
)
 
func main() {
	Md5ByRemoteFile()
}
 
func Md5ByRemoteFile() {
	// 指定文件的URL
	url := "https://minio.dev.inrobot.cloud/map/000fa28f-c114-49fe-9699-8c7f8b2eb222.png"
 
	// 发起HTTP GET请求
	resp, err := http.Get(url)
	if err != nil {
		fmt.Println("Failed to fetch file:", err)
		return
	}
	defer resp.Body.Close()
 
	// 检查响应状态码
	if resp.StatusCode != http.StatusOK {
		fmt.Printf("Failed to fetch file: HTTP status code %d\n", resp.StatusCode)
		return
	}
 
	// 创建一个md5哈希对象
	hasher := md5.New()
 
	// 将文件内容读入哈希对象
	if _, err := io.Copy(hasher, resp.Body); err != nil {
		fmt.Println("Failed to read file:", err)
		return
	}
 
	// 计算并获取哈希值
	hashBytes := hasher.Sum(nil)
 
	// 将哈希值转换为十六进制字符串
	hashString := hex.EncodeToString(hashBytes)
 
	// 输出MD5哈希值
	fmt.Println("MD5 hash of the file:", hashString)
}

//MD5 
func Md5SmallFile(path string) (string, error) {
   file, err := os.Open(path)
   if err != nil {
      return "", err
   }
   defer file.Close()

   h := md5.New()
   _, err = io.Copy(h, file)
   if err != nil {
      return "", err
   }

   return hex.EncodeToString(h.Sum(nil)), nil
}


func Md5BigFile(path string) (string, error) {
   var fileChunk uint64 = 10485760
   file, err := os.Open(path)
   if err != nil {
      return "", err
   }
   defer file.Close()
   // calculate the file size
   info, _ := file.Stat()
   fileSize := info.Size()
   blocks := uint64(math.Ceil(float64(fileSize) / float64(fileChunk)))
   h := md5.New()

   for i := uint64(0); i < blocks; i++ {
      blockSize := int(math.Min(float64(fileChunk), float64(fileSize-int64(i*fileChunk))))
      buf := make([]byte, blockSize)

      _, err := file.Read(buf)
      if err != nil {
         return "", err
      }
      _, err = io.WriteString(h, string(buf)) // append into the hash
      if err != nil {
         return "", err
      }
   }
   
   return hex.EncodeToString(h.Sum(nil)), nil
}


func MD5String(v string) string {
	d := []byte(v)
	m := md5.New()
	m.Write(d)
	return hex.EncodeToString(m.Sum(nil))
}

func Sum(data []byte) [Size]byte