Java 将文件的内容复制到另一个文件

java将一个文件的内容复制到另一个文件。

使用BufferedWriter类的read和write方法将一个文件的内容复制到另一个文件。

完整代码

import java.io.*;
 
public class Main {
    public static void main(String[] args) throws Exception {
        BufferedWriter out1 = new BufferedWriter(new FileWriter("onefile"));
        out1.write("string to be copied\n");
        out1.close();
        InputStream in = new FileInputStream(new File("onefile"));
        OutputStream out = new FileOutputStream
        (new File("twofile"));
        byte[] buf = new byte[1024];
        int len;
        while ((len = in.read(buf)) > 0) {
            out.write(buf, 0, len);
        }
        in.close();
        out.close();
        BufferedReader in1 = new BufferedReader(new FileReader("twofile"));
        String str;
        while ((str = in1.readLine()) != null) {
            System.out.println(str);
        }
        in1.close();
    }
}

结果输出

string to be copied