console控制台內容輸出到文件

import java.io.*;

public class IO2File {
    public static void main(String[] args) throws IOException {

        File f=new File("out.txt");
        f.createNewFile();
        FileOutputStream fileOutputStream = new FileOutputStream(f);
        PrintStream printStream = new PrintStream(fileOutputStream);
        System.setOut(printStream);
        System.out.println("默認輸出到控制台的這一句，輸出到了文件 out.txt");
    }
}