package com.ruoyi.web.controller.api.util;
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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.nio.charset.StandardCharsets;
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import java.security.MessageDigest;
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public class MD5Util {
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private static final char[] HEX_CHARS = "0123456789abcdef".toCharArray();
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/**
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* 计算字符串MD5
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*/
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public static String md5(String input) {
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if (input == null) return null;
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try {
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MessageDigest md = MessageDigest.getInstance("MD5");
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byte[] digest = md.digest(input.getBytes(StandardCharsets.UTF_8));
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return bytesToHex(digest);
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} catch (Exception e) {
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throw new RuntimeException("MD5计算失败", e);
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}
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}
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/**
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* 计算文件MD5
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*/
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public static String md5(File file) {
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if (file == null || !file.exists()) return null;
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try (FileInputStream fis = new FileInputStream(file)) {
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MessageDigest md = MessageDigest.getInstance("MD5");
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byte[] buffer = new byte[8192];
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int length;
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while ((length = fis.read(buffer)) != -1) {
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md.update(buffer, 0, length);
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}
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return bytesToHex(md.digest());
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} catch (Exception e) {
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throw new RuntimeException("文件MD5计算失败", e);
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}
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}
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/**
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* 字节数组转十六进制字符串
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*/
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private static String bytesToHex(byte[] bytes) {
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if (bytes == null) return null;
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StringBuilder sb = new StringBuilder(bytes.length * 2);
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for (byte b : bytes) {
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sb.append(HEX_CHARS[(b >> 4) & 0x0F]);
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sb.append(HEX_CHARS[b & 0x0F]);
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}
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return sb.toString();
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}
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/**
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* 验证MD5
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*/
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public static boolean verify(String input, String md5) {
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return md5(input).equalsIgnoreCase(md5);
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}
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public static boolean verify(File file, String md5) {
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return md5(file).equalsIgnoreCase(md5);
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}
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}
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