节点流——FileReaderWriter（使用）

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileReader;

import java.io.FileWriter;

import org.junit.Test;

public class TestFileReaderWriter {

//读入

    @Test

    public void testFileRead() throws Exception {

        File f = new File("hello3.txt");

        FileReader fr = new FileReader(f);

        char[] c = new char[24];

        int len;

        while ((len = fr.read(c)) != -1) {

            String str = new String(c, 0, len);

            System.out.println(str);

        }

        fr.close();

    }

//复制,实现文本文件的复制，对应非文本文件只能使用字节流

//非文本文件：视频，音频，图片，二进制文件等

    @Test

    public void testCopy() throws Exception {

        File out = new File("hello3.txt");

        FileReader fr = new FileReader(out);

        File in = new File("hello.txt");

        FileWriter fw = new FileWriter(in);

        int len;

        char[] c = new char[24];

        while ((len = fr.read(c)) != -1) {

            fw.write(c, 0, len);

        }

        fw.close();

    }

}