高效整合，一招学会Java文件合并技巧

引言

文件合并的基本原理

文件合并的基本原理是将多个文件的全部内容按照一定的顺序合并成一个新文件。在Java中，可以通过FileInputStream和FileOutputStream类来实现文件的读取和写入操作。

实现文本文件合并

以下是一个简单的Java代码示例，演示如何将多个文本文件合并成一个文本文件：

import java.io.*;

public class TextFileMerger {
    public static void main(String[] args) {
        String[] fileNames = {"file1.txt", "file2.txt", "file3.txt"};
        String outputFileName = "mergedFile.txt";

        try (BufferedWriter writer = new BufferedWriter(new FileWriter(outputFileName))) {
            for (String fileName : fileNames) {
                try (BufferedReader reader = new BufferedReader(new FileReader(fileName))) {
                    String line;
                    while ((line = reader.readLine()) != null) {
                        writer.write(line);
                        writer.newLine();
                    }
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

实现图片文件合并

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class ImageFileMerger {
    public static void main(String[] args) {
        String[] fileNames = {"image1.png", "image2.png", "image3.png"};
        String outputFileName = "mergedImage.png";

        List<BufferedImage> images = new ArrayList<>();
        for (String fileName : fileNames) {
            try {
                BufferedImage image = ImageIO.read(new File(fileName));
                images.add(image);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        BufferedImage mergedImage = new BufferedImage(images.get(0).getWidth() * images.size(),
                images.get(0).getHeight(), BufferedImage.TYPE_INT_ARGB);

        int x = 0;
        for (BufferedImage image : images) {
            mergedImage.createGraphics().drawImage(image, x, 0, null);
            x += image.getWidth();
        }

        try {
            ImageIO.write(mergedImage, "png", new File(outputFileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

总结