public class FileCopy {	/**	 * 1、在D盘创建一个文件，用于存储C盘文件中的数据。	 * 2、定义读取流和C盘文件关联	 * 3、通过不断的读写完成数据存储。	 * 4，关闭资源	 */	public static void main(String[] args) {		FileWriter fw = null;		FileReader fr = null;		try {			fw = new FileWriter("D:/java.txt",true);			fw.write("abcde");			fw.flush();			fr = new FileReader("D:/java.txt");			char[] chs = new char[1024];			int len = 0;			fw = new FileWriter("D:/java3.txt");			while((len=fr.read(chs))!=-1){				fw.write(chs, 0, len);			}		} catch (IOException e) {			e.printStackTrace();			throw new RuntimeException("读写失败");		} finally{			if(fw!=null)				try {					fw.close();				} catch (IOException e) {					// TODO Auto-generated catch block					e.printStackTrace();				}			if(fr!=null)				try {					fr.close();				} catch (IOException e) {					// TODO Auto-generated catch block					e.printStackTrace();				}		}	}}package com.io;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.FileNotFoundException;import java.io.FileReader;import java.io.FileWriter;import java.io.IOException;public class BufferedCopy {   //通过缓冲区复制一个java文件	public static void main(String[] args) {		BufferedReader br = null;		BufferedWriter bw = null;		try {			br = new BufferedReader(new FileReader("d:/FileCopy.java"));			bw = new BufferedWriter(new FileWriter("d:/FileCopy_Copy.java"));			String n = null;			while((n=br.readLine())!=null){				//readLine()不会返回终止符(回车符)，所以每写一行要换行一次加入newLine()				bw.write(n);				bw.newLine();				bw.flush();			}		} catch (FileNotFoundException e) {			e.printStackTrace();		} catch (IOException e) {			e.printStackTrace();		} finally{			if(br!=null)				try {					br.close();				} catch (IOException e) {					e.printStackTrace();				}			if(bw!=null){				try {					bw.close();				} catch (IOException e) {					e.printStackTrace();				}			}		}			}}