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62 lines
2.0 KiB
62 lines
2.0 KiB
package com.example.musicplayer.util;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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/**
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* <pre>
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* author : 残渊
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* time : 2019/11/10
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* desc : MD5加密工具
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* </pre>
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*/
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public class MD5Util {
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public static String getFileMD5(File file) {
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// 如果文件为空或不存在，返回空字符串
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if (file == null ||!file.exists()) return "";
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FileInputStream in = null;
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// 用于存储文件读取的数据
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byte[] buffer = new byte[1024];
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// 存储最终的 MD5 结果
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StringBuilder res = new StringBuilder();
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int len;
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try {
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// 获取 MD5 消息摘要对象
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MessageDigest messageDigest = MessageDigest.getInstance("MD5");
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in = new FileInputStream(file);
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// 循环读取文件内容
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while ((len = in.read(buffer))!= -1) {
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// 更新消息摘要对象，分段读取文件数据
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messageDigest.update(buffer, 0, len);
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}
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// 计算最终的 MD5 摘要
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byte[] bytes = messageDigest.digest();
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// 将 MD5 摘要的字节数组转换为 16 进制字符串
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for (byte b : bytes) {
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String temp = Integer.toHexString(b & 0xff);
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if (temp.length()!= 2) {
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temp = "0" + temp;
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}
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res.append(temp);
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}
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// 返回最终的 MD5 字符串
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return res.toString();
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} catch (Exception e) {
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e.printStackTrace();
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} finally {
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if (null!= in) {
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try {
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// 关闭文件输入流
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in.close();
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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}
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return res.toString();
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}
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} |