C#端
using System;
using System.IO;
using System.Security.Cryptography;
namespace 计算文件的MD5值
{
class MD5_Helper
{
/// <summary>
/// 文件MD5校验
/// </summary>
/// <param name="pathName">文件绝对路径</param>
/// <returns>MD5校验码</returns>
public string getMD5Hash( string pathName)
{
string strResult = "" ;
string strHashData = "" ;
byte [] arrbytHashValue;
FileStream oFileStream = null ;
MD5CryptoServiceProvider oMD5Hasher =
new MD5CryptoServiceProvider();
try
{
oFileStream = new FileStream(pathName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
arrbytHashValue = oMD5Hasher.ComputeHash(oFileStream); //计算指定Stream 对象的哈希值
oFileStream.Close();
//由以连字符分隔的十六进制对构成的String，其中每一对表示value 中对应的元素；例如[F-2C-4A]
strHashData = BitConverter.ToString(arrbytHashValue);
//替换-
strHashData = strHashData.Replace( "-" , "" );
strResult = strHashData;
}
catch (System.Exception ex)
{
}
return strResult;
}
/// <summary>
/// 字节数组校验
/// </summary>
/// <param name="buffer">待字节数组</param>
/// <returns>MD5校验码</returns>
public string getMD5Hash( byte [] buffer)
{
string strResult = "" ;
string strHashData = "" ;
byte [] arrbytHashValue;
MD5CryptoServiceProvider oMD5Hasher =
new MD5CryptoServiceProvider();
try
{
arrbytHashValue = oMD5Hasher.ComputeHash(buffer); //计算指定Stream 对象的哈希值
//由以连字符分隔的十六进制对构成的String，其中每一对表示value 中对应的元素；例如[F-2C-4A]
strHashData = BitConverter.ToString(arrbytHashValue);
//替换-
strHashData = strHashData.Replace( "-" , "" );
strResult = strHashData;
}
catch (System.Exception ex)
{
}
return strResult;
}
}
}
Java端
package com;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class MD5Util {
/**
* 默认的密码字符串组合，用来将字节转换成 16 进制表示的字符,apache校验下载的文件的正确性用的就是默认的这个组合
*/
protected static char hexDigits[] = { '0' , '1' , '2' , '3' , '4' , '5' , '6' , '7' , '8' , '9' , 'A' , 'B' , 'C' , 'D' , 'E' , 'F' };
protected static MessageDigest messagedigest = null ;
static {
try {
messagedigest = MessageDigest.getInstance( "MD5" );
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
}
public static void main(String[] args) throws IOException {
byte [] buffer= "HelloWorld" .getBytes(); //字节数组校验
String md55 = getFileMD5String(buffer);
System.out.println( "md55:" + md55);
}
public static String getFileMD5String(File file) throws IOException {
InputStream fis;
fis = new FileInputStream(file);
byte [] buffer = new byte [ 1024 ];
int numRead = 0 ;
while ((numRead = fis.read(buffer)) > 0 ) {
messagedigest.update(buffer, 0 , numRead);
}
fis.close();
return bufferToHex(messagedigest.digest());
}
public static String getFileMD5String( byte [] buffer) throws IOException {
messagedigest.update(buffer, 0 , buffer.length);
return bufferToHex(messagedigest.digest());
}
private static String bufferToHex( byte bytes[]) {
return bufferToHex(bytes, 0 , bytes.length);
}
private static String bufferToHex( byte bytes[], int m, int n) {
StringBuffer stringbuffer = new StringBuffer( 2 * n);
int k = m + n;
for ( int l = m; l < k; l++) {
appendHexPair(bytes[l], stringbuffer);
}
return stringbuffer.toString();
}
private static void appendHexPair( byte bt, StringBuffer stringbuffer) {
char c0 = hexDigits[(bt & 0xf0 ) >> 4 ]; // 取字节中高 4 位的数字转换
// 为逻辑右移，将符号位一起右移,此处未发现两种符号有何不同
char c1 = hexDigits[bt & 0xf ]; // 取字节中低 4 位的数字转换
stringbuffer.append(c0);
stringbuffer.append(c1);
}
}
以上就是小编为大家带来的C#与Java的MD5简单验证(实例代码)的全部内容了，希望对大家有所帮助，多多支持服务器之家~
dy("nrwz");
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