217 lines
5.8 KiB
Plaintext
217 lines
5.8 KiB
Plaintext
package com.nationalelectric.greenH5.utils;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.nio.MappedByteBuffer;
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import java.nio.channels.FileChannel;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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import java.util.*;
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public class MD5Util {
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private static String kk = "greenh5";
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public static String encrypt(String data) {
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try {
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java.security.MessageDigest md = java.security.MessageDigest.getInstance("MD5");
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byte[] array = md.digest((data + kk).getBytes());
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StringBuffer sb = new StringBuffer();
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for (int i = 0; i < array.length; ++i) {
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sb.append(Integer.toHexString((array[i] & 0xFF) | 0x100).substring(1, 3));
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}
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return sb.toString().toUpperCase();
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} catch (NoSuchAlgorithmException e) {
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// TODO Auto-generated catch block
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return null;
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}
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}
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/**
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* 签名加密
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*
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* @param map
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* @return
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*/
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public static String MD5(Map map) {
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// 参数按键名升序排序
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List list = new ArrayList();
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Iterator iter = map.entrySet().iterator();
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while (iter.hasNext()) {
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Map.Entry entry = (Map.Entry) iter.next();
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list.add(entry.getKey());
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}
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Collections.sort(list);
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// 拼接参数
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StringBuilder param = new StringBuilder();
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for (int i = 0; i < list.size(); i++) {
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if (i == 0) {
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param.append(list.get(i) + "=" + map.get(list.get(i)));
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} else {
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param.append("&" + list.get(i) + "=" + map.get(list.get(i)));
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}
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}
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// 测试默认密匙，正式上线会约定修改
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param.append("&secretkey=xxxxxxxxx");
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try {
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// MD5加密
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java.security.MessageDigest md = java.security.MessageDigest.getInstance("MD5");
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byte[] array = md.digest(param.toString().getBytes());
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StringBuffer sb = new StringBuffer();
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for (int i = 0; i < array.length; ++i) {
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sb.append(Integer.toHexString((array[i] & 0xFF) | 0x100).substring(1, 3));
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}
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return sb.toString().toUpperCase();
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} catch (java.security.NoSuchAlgorithmException e) {
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}
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return null;
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}
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public static String getMD5(String param) throws NoSuchAlgorithmException {
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// MD5加密
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java.security.MessageDigest md = java.security.MessageDigest.getInstance("MD5");
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byte[] array = md.digest(param.toString().getBytes());
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StringBuffer sb = new StringBuffer();
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for (int i = 0; i < array.length; ++i) {
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sb.append(Integer.toHexString((array[i] & 0xFF) | 0x100).substring(1, 3));
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}
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return sb.toString();
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}
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// ==========================================
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/**
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* 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
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*/
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protected static char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e',
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'f' };
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protected static MessageDigest messagedigest = null;
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static {
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try {
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messagedigest = MessageDigest.getInstance("MD5");
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} catch (NoSuchAlgorithmException nsaex) {
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nsaex.printStackTrace();
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}
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}
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/**
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* 生成字符串的md5校验值
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*
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* @param s
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* @return
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*/
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public static String getMD5String(String s) {
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return getMD5String(s.getBytes());
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}
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/**
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* 判断字符串的md5校验码是否与一个已知的md5码相匹配
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*
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* @param possword
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* 要校验的字符串
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* @param md5PwdStr
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* 已知的md5校验码
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* @return
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*/
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public static boolean checkPossword(String possword, String md5PwdStr) {
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String s = getMD5String(possword);
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return s.equals(md5PwdStr);
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}
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/**
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* 生成文件的md5校验值
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*
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* @param file
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* @return
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* @throws IOException
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*/
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public static String getFileMD5String(File file) throws IOException {
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InputStream fis = null;
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try {
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fis = new FileInputStream(file);
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byte[] buffer = new byte[1024];
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int numRead = 0;
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while ((numRead = fis.read(buffer)) > 0) {
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messagedigest.update(buffer, 0, numRead);
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}
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} catch (Exception e) {
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e.printStackTrace();
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}finally {
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if (fis != null) {
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fis.close();
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}
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}
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return bufferToHex(messagedigest.digest());
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}
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/**
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* JDK1.4中不支持以MappedByteBuffer类型为参数update方法，并且网上有讨论要慎用MappedByteBuffer，
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* 原因是当使用 FileChannel.map 方法时，MappedByteBuffer 已经在系统内占用了一个句柄， 而使用
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* FileChannel.close 方法是无法释放这个句柄的，且FileChannel有没有提供类似 unmap 的方法，
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* 因此会出现无法删除文件的情况。
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*
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* 不推荐使用
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*
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* @param file
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* @return
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* @throws IOException
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*/
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public static String getFileMD5String_old(File file) throws IOException {
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FileInputStream in = null;
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try {
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in = new FileInputStream(file);
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FileChannel ch = in.getChannel();
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MappedByteBuffer byteBuffer = ch.map(FileChannel.MapMode.READ_ONLY, 0, file.length());
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messagedigest.update(byteBuffer);
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} catch (Exception e) {
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e.printStackTrace();
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}finally {
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if (in != null) {
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in.close();
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}
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}
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return bufferToHex(messagedigest.digest());
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}
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public static String getMD5String(byte[] bytes) {
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messagedigest.update(bytes);
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return bufferToHex(messagedigest.digest());
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}
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private static String bufferToHex(byte bytes[]) {
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return bufferToHex(bytes, 0, bytes.length);
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}
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private static String bufferToHex(byte bytes[], int m, int n) {
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StringBuffer stringbuffer = new StringBuffer(2 * n);
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int k = m + n;
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for (int l = m; l < k; l++) {
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appendHexPair(bytes[l], stringbuffer);
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}
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return stringbuffer.toString();
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}
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private static void appendHexPair(byte bt, StringBuffer stringbuffer) {
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char c0 = hexDigits[(bt & 0xf0) >> 4];// 取字节中高 4 位的数字转换, >>>
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// 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
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char c1 = hexDigits[bt & 0xf];// 取字节中低 4 位的数字转换
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stringbuffer.append(c0);
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stringbuffer.append(c1);
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}
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}
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