JavaSE IO

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package com.atweihai.io;import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.OutputStream;import java.io.OutputStreamWriter;import java.io.Reader;import java.io.Writer;import org.junit.Test;---------- --原作者:尚硅谷-佟刚      IO 体系   (常用)    InputStream               OutputStream          FileInputStream           FileOutputStream        BufferedInputStream       BufferedOutputStream     ObjectInputStream         ObjectOutputStream    Reader                    Writer    FileReader                FileWriter     BufferedReader            BufferedWriter    InputStreamReader          OutputStreamWriter----------public class IOTest {    @Test    public void testInputStreamReaderAndOutputStreamWriter() throws   IOException{         //获取项目根路径         String rootPath=System.getProperty("user.dir");         //创建指向指定位置的输入流         InputStream in=new FileInputStream(rootPath+"/src/buffer.txt");         Reader reader=new InputStreamReader(in);         BufferedReader bufferedReader=new BufferedReader(reader);         //创建输出到指定位置的输出流         OutputStream out=new FileOutputStream(rootPath+"/buffer1.txt");         Writer   writer =new OutputStreamWriter(out);         BufferedWriter bufferedWriter=new BufferedWriter(writer);         String str=null;         int i=0;         //循环写入到指定文件         while((str=bufferedReader.readLine())!=null){             if(i!=0){                 bufferedWriter.write("\n");             }             bufferedWriter.write(str);             i++;         }         //关闭流资源         in.close();         reader.close();         bufferedReader.close();         bufferedWriter.close();         writer.close();         out.close();    }    @Test    public void testBufferedInputStreamAndBufferedOutputStream() throws IOException{        //获取项目根路径的两种方式:        //1.        String rootPath=new File("").getCanonicalPath();        //2.        String rootPath1=System.getProperty("user.dir");        //创建指向指定文件的输入流        InputStream in=new FileInputStream(rootPath1+"/src/buffer.txt");        //创建输出到指定文件的输出流        OutputStream out=new FileOutputStream(rootPath1+"/buffer1.txt");        //缓冲流 对输入输出流进行包装        BufferedInputStream bufferedInputStream=new BufferedInputStream(in);        BufferedOutputStream bufferedOutputStream=new BufferedOutputStream(out);        //创建字节缓冲数组        byte[] buffer=new byte[1024*10];        int len=0;        //循环写入到指定文件        while((len=bufferedInputStream.read(buffer))!=-1){            bufferedOutputStream.write(buffer, 0, len);        }        //关闭缓冲流  缓冲流内部关闭节点流        bufferedInputStream.close();        bufferedOutputStream.close();    }}
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