java IO 简单应用

 

package com.hzq;import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.BufferedReader;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.FileReader;import java.io.IOException;import java.io.PrintWriter;/** * 文件输入输出流练习 分字节流和字符流 2010-05-11 */public class FileIO {/** * @param args */public static void main(String[] args) {File srcFile = new File("src.txt");// 源文件File copyFile = new File("copyFile.txt");// 复制后的文件// ****************************************// *********使用字节流复制文件的标准代码*********// *****************************************try {FileInputStream in = new FileInputStream(srcFile);FileOutputStream out = new FileOutputStream(copyFile);int b;while ((b = in.read()) != -1) {// 当等于-1时读到文章末尾out.write(b);}/* * 关闭流 */out.close();in.close();// ****************************************// *********以下代码加上缓存以提高读写效率*********// *****************************************// 方法 一 用buffer 过滤BufferedInputStream iput = new BufferedInputStream(new FileInputStream(srcFile));BufferedOutputStream oput = new BufferedOutputStream(new FileOutputStream(copyFile));int c;while ((c = iput.read()) != -1) {oput.write(c);}/* * 关闭流 */oput.close();iput.close();// 方法二自定义缓存FileInputStream in2 = new FileInputStream(srcFile);FileOutputStream out2 = new FileOutputStream(copyFile);int b2;byte[] buffe = new byte[512];// 缓存while ((b2 = in2.read(buffe)) != -1) {// 当等于-1时读到文章末尾out2.write(buffe);}/* * 关闭流 */out2.close();in2.close();// ****************************************// *********使用字符流读写文本文件*************// *****************************************BufferedReader reader = new BufferedReader(new FileReader(srcFile));PrintWriter pw = new PrintWriter(copyFile);String line;while ((line = reader.readLine()) != null) {pw.write(line);}/* * 关闭流 */pw.close();reader.close();} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}}