【Java工具类】摘要算法之MD5、SHA1工具类

太过爱你忘了你带给我的痛 2022-11-13 04:23 173阅读 0赞

import java.io.File;
    import java.io.FileInputStream;
    import java.io.IOException;
    import java.nio.MappedByteBuffer;
    import java.nio.channels.FileChannel;
    import java.security.MessageDigest;
    import java.security.NoSuchAlgorithmException;
    
    public class DigestUtil { 
        //以16进制编码进行输出
        final static char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
    
        /** * 对文件进行MD5摘要 */
        public static String MD5(String path) { 
    
            String pathName = path;
            String md5 = "";
            try { 
                File file = new File(pathName);
                FileInputStream ins = new FileInputStream(file);
                FileChannel ch = ins.getChannel();
                MappedByteBuffer byteBuffer = ch.map(FileChannel.MapMode.READ_ONLY, 0, file.length());
                MessageDigest md = MessageDigest.getInstance("MD5");
                md.update(byteBuffer);
                ins.close();
                md5 = toHexString(md.digest());
            } catch (NoSuchAlgorithmException | IOException e) { 
                e.printStackTrace();
            }
            return md5;
        }
    
        /** * 对文件进行SHA1摘要 * * @param path * @return */
        public static String SHA1(String path) { 
            String pathName = path;
            String sha1 = "";
            try { 
                File file = new File(pathName);
                FileInputStream ins = new FileInputStream(file);
                FileChannel ch = ins.getChannel();
                MappedByteBuffer byteBuffer = ch.map(FileChannel.MapMode.READ_ONLY, 0, file.length());
                MessageDigest sha = MessageDigest.getInstance("SHA-1");
                sha.update(byteBuffer);
                ins.close();
                sha1 = toHexString(sha.digest());
            } catch (NoSuchAlgorithmException | IOException e) { 
                e.printStackTrace();
            }
            return sha1;
        }
    
        public static String toHexString(byte[] tmp) { 
            String s;
            char str[] = new char[tmp.length * 2];
            int k = 0;
            for (int i = 0; i < tmp.length; i++) { 
                byte byte0 = tmp[i];
                str[k++] = hex[byte0 >>> 4 & 0xf];
                str[k++] = hex[byte0 & 0xf];
            }
            s = new String(str);
            return s;
        }
    
    
        public static void main(String[] args) { 
            String path = "E:\\data\\istack-commons-runtime-3.0.8.jar";
            System.out.println(MD5(path));
            System.out.println(SHA1(path));
        }
    }

main方法执行结果

FFC22E80F61AB7295C02493856B4C520
    AFB12C586558A39B53039EE8C37F20ADC9E02F07

也可以使用是Apache下面的一个加解密开发包commons-codec

<dependency>
                <groupId>commons-codec</groupId>
                <artifactId>commons-codec</artifactId>
                <version>1.15</version>
            </dependency>

DigestUtils.sha1(data)；
    DigestUtils.md5Hex(data)；