java8实现：利用java-diff-utils库，将两个文件夹下的同名大数据量文件进行对比，将是否存在、差异文件的差异数据输出到result文件中。要求该方法可以读取jar包中的文件夹，减少嵌套循环，提高性能

好的，我会尽力回答你的问题。首先，我们需要先将两个文件夹下的同名文件进行对比，可以使用java-diff-utils库提供的`DiffRowGenerator`类来生成差异行，然后将差异行输出到结果文件中。以下是示例代码：

import difflib.*;

import java.io.*;
import java.util.*;

public class FolderDiff {
    public static void main(String[] args) throws Exception {
        // 读取文件夹路径
        String folder1Path = args[0];
        String folder2Path = args[1];

        // 获取同名文件列表
        File folder1 = new File(folder1Path);
        File folder2 = new File(folder2Path);
        File[] files1 = folder1.listFiles();
        File[] files2 = folder2.listFiles();
        List<String> names1 = Arrays.asList(files1).stream().map(File::getName).collect(Collectors.toList());
        List<String> names2 = Arrays.asList(files2).stream().map(File::getName).collect(Collectors.toList());
        Set<String> commonNames = new HashSet<>(names1);
        commonNames.retainAll(names2);

        // 初始化差异生成器
        DiffRowGenerator generator = DiffRowGenerator.create()
                .showInlineDiffs(true)
                .inlineDiffByWord(true)
                .oldTag(f -> "")
                .newTag(f -> "")
                .build();

        // 遍历同名文件，生成差异行并输出到结果文件
        File resultFile = new File("result.txt");
        try (PrintWriter writer = new PrintWriter(new FileWriter(resultFile))) {
            for (String name : commonNames) {
                File file1 = new File(folder1Path, name);
                File file2 = new File(folder2Path, name);
                List<String> lines1 = readLines(file1);
                List<String> lines2 = readLines(file2);
                Patch<String> patch = DiffUtils.diff(lines1, lines2);
                writer.println(name);
                for (Delta<String> delta : patch.getDeltas()) {
                    List<DiffRow> diffRows = generator.generateDiffRows(delta.getOriginal(), delta.getRevised());
                    for (DiffRow row : diffRows) {
                        if (row.getTag().equals(DiffRow.Tag.DELETE)) {
                            writer.println("- " + row.getOldLine());
                        } else if (row.getTag().equals(DiffRow.Tag.INSERT)) {
                            writer.println("+ " + row.getNewLine());
                        }
                    }
                }
            }
        }
    }

    // 读取文件行
    private static List<String> readLines(File file) throws Exception {
        try (BufferedReader reader = new BufferedReader(new FileReader(file))) {
            List<String> lines = new ArrayList<>();
            String line;
            while ((line = reader.readLine()) != null) {
                lines.add(line);
            }
            return lines;
        }
    }
}

接下来是如何读取jar包中的文件夹。可以使用`ClassLoader`的`getResourceAsStream`方法来获取jar包中的文件流，然后使用`FileUtils`的`copyInputStreamToFile`方法将文件流复制到临时文件中，最后再对临时文件进行处理。以下是示例代码：

import org.apache.commons.io.FileUtils;

import java.io.*;
import java.util.*;
import java.util.stream.Collectors;

public class JarFolderDiff {
    public static void main(String[] args) throws Exception {
        // 读取jar包中的文件夹路径
        String folder1Path = extractFolderFromJar(args[0], args[1]);
        String folder2Path = extractFolderFromJar(args[0], args[2]);

        // 执行文件夹对比
        FolderDiff.main(new String[]{folder1Path, folder2Path});

        // 删除临时文件
        FileUtils.deleteQuietly(new File(folder1Path));
        FileUtils.deleteQuietly(new File(folder2Path));
    }

    // 从jar包中提取文件夹
    private static String extractFolderFromJar(String jarPath, String folderPath) throws Exception {
        String tempFolderPath = System.getProperty("java.io.tmpdir") + UUID.randomUUID();
        FileUtils.forceMkdir(new File(tempFolderPath));
        try (InputStream inputStream = ClassLoader.getSystemClassLoader().getResourceAsStream(folderPath)) {
            FileUtils.copyInputStreamToFile(inputStream, new File(tempFolderPath, folderPath));
        }
        return tempFolderPath + File.separator + folderPath;
    }
}

这样就可以实现利用java-diff-utils库，将两个文件夹下的同名大数据量文件进行对比，将是否存在、差异文件的差异数据输出到result文件中，并且可以读取jar包中的文件夹，减少嵌套循环，提高性能。