sha256生成文件的唯一hash
php版本：
$filePath = ""http://file path;
$sha256 = hash_file("sha256", $filePath);
go版本：
package main
import (
"crypto/sha256"
"fmt"
"io"
"log"
"os"
)
func main() {
f, err := os.Open("file.txt")
if err != nil {
log.Fatal(err)
}
defer f.Close()
h := sha256.New()
if _, err := io.Copy(h, f); err != nil {
log.Fatal(err)
}
fmt.Printf("%x", h.Sum(nil))
}
java版本
byte[] buffer= new byte[8192];
int count;
MessageDigest digest = MessageDigest.getInstance("SHA-256");
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(fileName));
while ((count = bis.read(buffer)) > 0) {
digest.update(buffer, 0, count);
}
bis.close();
byte[] hash = digest.digest();
System.out.println(byte2Hex(hash));
private static String byte2Hex(byte[] bytes){
StringBuffer stringBuffer = new StringBuffer();
String temp = null;
for (int i=0;i<bytes.length;i++){
temp = Integer.toHexString(bytes[i] & 0xFF);
if (temp.length()==1){
//1得到一位的進(jìn)行補(bǔ)0操作
stringBuffer.append("0");
}
stringBuffer.append(temp);
}
return stringBuffer.toString();
}
所以：________________________________________________
從代碼量來說啄枕，PHP是世界上最好的語言。
