文件哈希 - VA伐木累

文件哈希
•发布于 •作者 liuzy •879 次浏览 •来自资讯

```
package com.liuzy;

import java.io.File;
import java.io.FileInputStream;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.text.SimpleDateFormat;
import java.util.zip.CRC32;

public class FileHash {
	public static void main(String[] args) {
		String f = "D:\\360极速浏览器下载\\SQLyog-11.2.4-0.x86.reg";
		File file = new File(f);
		System.out.println("文件：\t" + file.getPath());
		System.out.println("文件大小：\t" + fileLength(file));
		System.out.println("最后修改：\t" + new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(file.lastModified()));
		System.out.println("MD5：\t" + MD5(file));
		System.out.println("SHA1：\t" + SHA1(file));
		System.out.println("SHA256：  " + SHA256(file));
		System.out.println("CRC32：\t" + CRC32(file));
	}

public static String fileLength(File file) {
		long len = file.length();
		if (len > 1073741824) {
			return String.format("%.2fGB", len / 1073741824 + len % 1073741824 / 1073741824f);
		} else if (len > 1048576) {
			return String.format("%.2fMB", len / 1048576 + len % 1048576 / 1048576f);
		} else if (len > 1024) {
			return String.format("%.2fKB", len / 1024 + len % 1024 / 1024f);
		} else {
			return len + "B";
		}
	}

public static String MD5(File file) {
		return hash(file, "MD5");
	}

public static String SHA1(File file) {
		return hash(file, "SHA-1");
	}

public static String SHA256(File file) {
		return hash(file, "SHA-256");
	}

public static String CRC32(File file) {
		String hex = null;
		try {
			FileInputStream in = new FileInputStream(file);
			CRC32 crc = new CRC32();
			byte[] buffer = new byte[1024 * 1024 * 1];
			int len = 0;
			while ((len = in.read(buffer)) > 0) {
				crc.update(buffer, 0, len);
			}
			in.close();
			hex = Long.toHexString(crc.getValue());
		} catch (Exception e) {
			e.printStackTrace();
		}
		return hex;
	}

public static String hash(File file, String algorithm) {
		String hex = null;
		try {
			FileInputStream in = new FileInputStream(file);
			MessageDigest md = MessageDigest.getInstance(algorithm);
			byte[] buffer = new byte[1024 * 1024 * 10];
			int len = 0;
			while ((len = in.read(buffer)) > 0) {
				md.update(buffer, 0, len);
			}
			in.close();
			hex = toHex(md.digest());
		} catch (Exception e) {
			e.printStackTrace();
		}
		return hex;
	}

public static String toHex(byte[] bytes) {
		BigInteger bi = new BigInteger(1, bytes);
		String hex = bi.toString(16);
		int paddingLength = (bytes.length * 2) - hex.length();
		if (paddingLength > 0)
			return String.format("%0" + paddingLength + "d", 0) + hex;
		else
			return hex;
	}
}
```

0 回复

作者

liuzy

积分: 841

“ 黑眼圈圈男 ”

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SonarQube 9.4 + PostgreSQL

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