节点流——FileReaderWriter

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();

}

}