Java中如何合并两个文件呢?

合并文件的实现思路

1.将待操作文件读入到InputStream流中
2.使用ByteArrayOutputStream流
     将两个InputStream合并为一个输出流
3.将ByteArrayOutputStream转换为字节数组输出即可

package com.java265.a;
import java.io.*;
public class Demo {
    public static void main(String[] args) throws IOException {
        File file1 = new File("D:" + File.separator + "Document"
                + File.separator + "Document" + File.separator + "test1.txt");
        File file2 = new File("D:" + File.separator + "Document"
                + File.separator + "Document" + File.separator + "test2.txt");
    
        InputStream input1 = new FileInputStream(file1);
        InputStream input2 = new FileInputStream(file2);
    
        ByteArrayOutputStream output = new ByteArrayOutputStream();
    
        int temp = 0;
        while ((temp = input1.read()) != -1) {
            output.write(temp);
        }
        while ((temp = input2.read()) != -1) {
            output.write(temp);
        }
    
        byte[] data = output.toByteArray();
    
        output.close();
        input1.close();
        input2.close();
        System.out.println(new String(data));
    }
}