IO流：复制文本文件的5种方式实现

来源：互联网发布：树莓派开源人工智能编辑：程序博客网时间：2024/06/06 09:00
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 CopyFileDemo {    public static void main(String[] args) throws IOException {        String scrString = "a.txt";        String destString = "b.txt";        method1(scrString,destString);        method2(scrString,destString);        method3(scrString,destString);        method4(scrString,destString);        method5(scrString,destString);    }    //基本字符一次读写一个字符    private static void method1(String scrString,String destString) throws IOException{            FileReader fr = new FileReader(scrString);            FileWriter fw = new FileWriter(destString);            int ch = 0;            while((ch = fr.read()) != -1){                fw.write(ch);            }            fw.close();            fr.close();    }    //基本字符流，一次写一个数组    private static void method2(String scrString,String destString) throws IOException{        FileReader fr = new FileReader(scrString);        FileWriter fw = new FileWriter(destString);        char[] chs = new char[1024];        int len = 0;        while((len = fr.read(chs))!=-1){            fw.write(chs, 0, len);        }        fw.close();        fr.close();    }    //字符缓冲流一次读写一个字符        private static void method3(String scrString,String destString) throws IOException{            BufferedReader br = new BufferedReader(new FileReader(scrString));            BufferedWriter bw = new BufferedWriter(new FileWriter(destString));            int ch = 0;            while((ch = br.read())!=-1){                bw.write(ch);            }            bw.close();            br.close();        }    //字符缓冲流 一次读写一个字符数组        private static void method4(String scrString,String destString) throws IOException{            BufferedReader br = new BufferedReader(new FileReader(scrString));            BufferedWriter bw = new BufferedWriter(new FileWriter(destString));            char[] chs = new char[1024];            int len = 0;            while((len = br.read(chs)) != -1){                bw.write(chs, 0, len);            }            bw.close();            br.close();        }        //字符缓冲流一次写一个字符串        private static void method5(String scrString,String destString) throws IOException{            BufferedReader br = new BufferedReader(new FileReader(scrString));            BufferedWriter bw = new BufferedWriter(new FileWriter(destString));            String line = null;            while((line = br.readLine()) != null){                bw.write(line);                bw.newLine();                bw.flush();            }            bw.close();            br.close();        }}
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