package com.ibeetl.admin.core.util;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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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.math.BigInteger;
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import java.security.MessageDigest;
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public class MD5Util {
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static Logger log = LoggerFactory.getLogger(MD5Util.class);
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/**
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* 字符串的MD5
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* @param plainText
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* @return
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*/
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public static String encode(String plainText) {
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try {
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MessageDigest md = MessageDigest.getInstance("MD5");
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md.update(plainText.getBytes());
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byte b[] = md.digest();
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int i;
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StringBuffer buf = new StringBuffer("");
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for (int offset = 0; offset < b.length; offset++) {
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i = b[offset];
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if (i < 0){
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i += 256;
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}
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if (i < 16){
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buf.append("0");
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}
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buf.append(Integer.toHexString(i));
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}
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return buf.toString();
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//System.out.println("result: " + buf.toString());// 32位的加密
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//System.out.println("result: " + buf.toString().substring(8, 24));// 16位的加密
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} catch (Exception e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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}
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return "";
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}
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/**
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* 文件的MD5
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* @param filePath
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* @return
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*/
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public static String getFileMD5(String filePath){
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String value = null;
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FileInputStream in = null;
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try {
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File file = new File(filePath);
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in = new FileInputStream(file);
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MessageDigest md5 = MessageDigest.getInstance("MD5");
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byte[] buffer = new byte[8192];
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int c;
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while ((c = in.read(buffer)) != -1) {
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md5.update(buffer, 0, c);
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}
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BigInteger bi = new BigInteger(1, md5.digest());
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value = bi.toString(16).toUpperCase();
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} catch (Exception e) {
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log.error("{}", e);
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} finally {
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if (null != in) {
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try {
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in.close();
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} catch (IOException e) {
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log.error("{}", e);
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}
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}
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}
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return value;
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}
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public static String wxPaySign(String origin, String charsetname) {
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String resultString = null;
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try {
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resultString = new String(origin);
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MessageDigest md = MessageDigest.getInstance("MD5");
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if (charsetname == null || "".equals(charsetname)) {
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resultString = byteArrayToHexString(md.digest(resultString.getBytes()));
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}else {
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resultString = byteArrayToHexString(md.digest(resultString.getBytes(charsetname)));
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}
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} catch (Exception exception) {
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exception.printStackTrace();
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}
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return resultString;
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}
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private static String byteArrayToHexString(byte b[]) {
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StringBuffer resultSb = new StringBuffer();
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for (int i = 0; i < b.length; i++)
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resultSb.append(byteToHexString(b[i]));
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return resultSb.toString();
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}
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private static String byteToHexString(byte b) {
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int n = b;
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if (n < 0) {
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n += 256;
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}
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int d1 = n / 16;
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int d2 = n % 16;
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return hexDigits[d1] + hexDigits[d2];
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}
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private static final String hexDigits[] = { "0", "1", "2", "3", "4", "5",
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"6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
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public static void main(String args[]) {
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String str = "abc";
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Long b1 = System.currentTimeMillis();
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for(int i =0;i<1;i++){
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//MD5.encode(str);
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System.out.println(MD5Util.encode(str)); //900150983cd24fb0d6963f7d28e17f72
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// Md5PasswordEncoder md5 = new Md5PasswordEncoder();
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// //md5.setEncodeHashAsBase64(false);
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// //md5.encodePassword(str, "");
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// System.out.println(md5.encodePassword(str, ""));
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}
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Long e1 = System.currentTimeMillis();
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System.out.println("MD5.encode耗时:"+(e1-b1));
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}
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}
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