JAVA中读写文件操作

java文件读取有两种类型，我这里的是字节流的读取操作
package test1;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class Test {

public static void main(String[] args) throws IOException {
int length=0;
    File file=new File("src/123.txt");
    File file2=new File("001.txt");
    FileInputStream fileInputStream=new FileInputStream(file);
    FileOutputStream fileOutputStream=new FileOutputStream(file2);
    
    byte []arr=new byte[1024];
    
    while((length=fileInputStream.read(arr))>0) {
       String string=new String(arr, 0, length);
    System.out.println(string);
    fileOutputStream.write(arr);
   
    }
    fileInputStream.close();
    fileOutputStream.close();
    
}

}