Java SE判断两个文件内容是否相同的多种方法代码

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;

public boolean areFilesEqual(Path file1, Path file2) throws IOException {
    return Files.mismatch(file1, file2) == -1;
}

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Arrays;

public boolean areFileContentsEqual(Path file1, Path file2) throws IOException {
    byte[] content1 = Files.readAllBytes(file1);
    byte[] content2 = Files.readAllBytes(file2);
    return Arrays.equals(content1, content2);
}

import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;

public static boolean areFileContentsEqual(Path file1, Path file2) throws IOException {
    try (InputStream is1 = Files.newInputStream(file1);
         InputStream is2 = Files.newInputStream(file2)) {
        int byte1, byte2;
        
        do {
            byte1 = is1.read();
            byte2 = is2.read();
            if (byte1 != byte2) {
                return false;
            }
        } while (byte1 != -1);
        
        return true;
    }
}

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public boolean areFilesEqual(byte[] input1, byte[] input2) throws IOException, NoSuchAlgorithmException {
    MessageDigest md5 = MessageDigest.getInstance("MD5");

    byte[] file1Hash = md5.digest(input1);
    byte[] file2Hash = md5.digest(input2);

    return MessageDigest.isEqual(file1Hash, file2Hash);
}

public boolean areFileContentsEqual(Path file1, Path file2) throws IOException {
    try (FileChannel channel1 = FileChannel.open(file1, StandardOpenOption.READ);
         FileChannel channel2 = FileChannel.open(file2, StandardOpenOption.READ)) {

        long size1 = channel1.size();
        long size2 = channel2.size();

        if (size1 != size2) {
            // File sizes are different, contents cannot be equal
            return false;
        }

        ByteBuffer buffer1 = ByteBuffer.allocateDirect(8192);
        ByteBuffer buffer2 = ByteBuffer.allocateDirect(8192);

        while (channel1.read(buffer1) != -1) {
            buffer1.flip();
            channel2.read(buffer2);
            buffer2.flip();

            if (!buffer1.equals(buffer2)) {
                // File contents are not equal
                return false;
            }

            buffer1.clear();
            buffer2.clear();
        }

        return true;
    }
}

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.attribute.BasicFileAttributes;

public boolean areFilesEqual(Path file1, Path file2) throws IOException {
    BasicFileAttributes attrs1 = Files.readAttributes(file1, BasicFileAttributes.class);
    BasicFileAttributes attrs2 = Files.readAttributes(file2, BasicFileAttributes.class);

    return attrs1.size() == attrs2.size() &&
           attrs1.lastModifiedTime().equals(attrs2.lastModifiedTime());
}

import org.apache.commons.io.FileUtils;

public boolean areFilesEqual(File file1, File file2) throws IOException {
    return FileUtils.contentEquals(file1, file2);
}

import cn.hutool.core.io.FileUtil;

public boolean areFilesEqual(File file1, File file2) throws IOException {
    FileUtil.contentEquals(file1,file2)
}