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); } }

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