java IO 字节流 字符流流操作

package io.transstream.demo;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;

import com.sun.java.util.jar.pack.Package.File;
import com.sun.org.apache.xalan.internal.xsltc.trax.OutputSettings;
import com.sun.swing.internal.plaf.synth.resources.synth_it;

import io.charstream.buffer.BufferWriterDemo;

public class TransStreamDemo {

public static void main(String[] args) throws IOException {
/*
* 需求1 将键盘录入的数据写入到一个文件中
*
*
*/

/*
BufferedReader bufr=new BufferedReader(new InputStreamReader(System.in));//键盘录入 重要

BufferedWriter bufw=new BufferedWriter(new OutputStreamWriter(new FileOutputStream("d:\\case.txt")));

*/
//需求2 将一个文本文件的内容 显示到控制台上
//BufferedReader bufr=new BufferedReader(new InputStreamReader(new FileInputStream("d:\\case.txt")));

//BufferedWriter bufw=new BufferedWriter(new OutputStreamWriter(System.out));

//需求3 将一个文本文件中的内容复制到另一个文件中

BufferedReader bufr=new BufferedReader(new InputStreamReader(new FileInputStream("d:\\case.txt")));

BufferedWriter bufw=new BufferedWriter(new OutputStreamWriter(new FileOutputStream("d:\\aaaa.txt")));

String line=null;
while((line=bufr.readLine())!=null) {
if(line.equals("over")) {
return;
}
//System.out.println(line.toUpperCase());
//outw.write(line.toUpperCase()+"\r\n");
//outw.flush();
bufw.write(line.toUpperCase());
bufw.newLine();
bufw.flush();
}

}

}