IO流复制文件

来源：互联网发布：专业配色软件编辑：程序博客网时间：2024/05/16 10:15

package com;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.File;import java.io.FileReader;import java.io.FileWriter;import java.io.IOException;/* * 需求：IO流复制文件

 *分析： * 打开文件能看懂-->使用字符流 * 有五种方式，推荐使用第五种，效更高 * */public class CopyFile {public static void main(String[] args) throws IOException{//数据源File srcfile=new File("数据源");//目的地File destfile=new File("目的地");//methd1(srcfile,destfile);//methd2(srcfile,destfile);//methd3(srcfile,destfile);//methd4(srcfile,destfile);methd5(srcfile,destfile);}/*//方式四：使用缓冲字符流一次读取一个字符数组private static void methd4(File srcfile, File destfile) throws IOException{BufferedReader br=new BufferedReader(new FileReader(srcfile));BufferedWriter bw=new BufferedWriter(new FileWriter(destfile));char[] ch=new char[1024];int length=0;while((length=br.read(ch))!=-1){bw.write(ch,0,length);}bw.close();br.close();}*//*//方式三：使用缓冲字符流一次读取一个字符private static void methd3(File srcfile, File destfile) throws IOException{BufferedReader br=new BufferedReader(new FileReader(srcfile));BufferedWriter bw=new BufferedWriter(new FileWriter(destfile));int ch=0;while((ch=br.read())!=-1){bw.write(ch);}bw.close();br.close();}*//*//方式二：基本字符流一次读写一个字符数组private static void methd2(File srcfile, File destfile) throws IOException{FileReader fr=new FileReader(srcfile);FileWriter fw=new FileWriter(destfile);char[] ch=new char[1024];int length=0;while((length=fr.read(ch))!=-1){fw.write(ch,0,length);}//关闭资源，先开后关原则fw.close();fr.close();}*//*//方式一：基本字符流一次读写一个字符private static void methd1(File srcfile, File destfile) throws IOException{FileReader fr=new FileReader(srcfile);FileWriter fw=new FileWriter(destfile);int ch=0;while((ch=fr.read())!=-1){fw.write(ch);}fw.close();fr.close();}*///方式五：使用缓冲字符流一次读取一个字符串private static void methd5(File srcfile, File destfile) throws IOException{BufferedReader br=new BufferedReader(new FileReader(srcfile));BufferedWriter bw=new BufferedWriter(new FileWriter(destfile));String line=null;while((line=br.readLine())!=null){bw.write(line);bw.newLine();bw.flush();}bw.close();br.close();}}

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