IO流复制文本文件五种方法

package cn.itcast_01;

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

/*

 * 复制文本文件

 * 

 * 分析：

 * 复制数据，如果我们知道用记事本打开并能够读懂，就用字符流，否则用字节流。

 * 通过该原理，我们知道我们应该采用字符流更方便一些。

 * 而字符流有5种方式，所以做这个题目我们有5种方式。推荐掌握第5种。

 * 数据源：

 * c:\\a.txt -- FileReader -- BufferdReader

 * 目的地：

 * d:\\b.txt -- FileWriter -- BufferedWriter

 */

public class CopyFileDemo {
public static void main(String[] args) throws IOException {
String srcString = "c:\\a.txt";
String destString = "d:\\b.txt";
// method1(srcString, destString);
// method2(srcString, destString);
// method3(srcString, destString);
// method4(srcString, destString);
method5(srcString, destString);
}

// 字符缓冲流一次读写一个字符串
private static void method5(String srcString, String destString)
throws IOException {
BufferedReader br = new BufferedReader(new FileReader(srcString));
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();
}

// 字符缓冲流一次读写一个字符数组
private static void method4(String srcString, String destString)
throws IOException {
BufferedReader br = new BufferedReader(new FileReader(srcString));
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();
}

// 字符缓冲流一次读写一个字符
private static void method3(String srcString, String destString)
throws IOException {
BufferedReader br = new BufferedReader(new FileReader(srcString));
BufferedWriter bw = new BufferedWriter(new FileWriter(destString));

int ch = 0;
while ((ch = br.read()) != -1) {
bw.write(ch);
}

bw.close();
br.close();
}

// 基本字符流一次读写一个字符数组
private static void method2(String srcString, String destString)
throws IOException {
FileReader fr = new FileReader(srcString);
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();
}

// 基本字符流一次读写一个字符
private static void method1(String srcString, String destString)
throws IOException {
FileReader fr = new FileReader(srcString);
FileWriter fw = new FileWriter(destString);

int ch = 0;
while ((ch = fr.read()) != -1) {
fw.write(ch);
}

fw.close();
fr.close();
}
}