java文本复制的9种方式

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#java #文件复制

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本文介绍了九种不同的文件复制方法，包括使用FileReader/FileWriter、BufferedReader/BufferedWriter、FileInputStream/FileOutputStream、BufferedInputStream/BufferedOutputStream、InputStreamReader/OutputStreamWriter等进行文件复制的具体实现。

package copy;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class FileCopy {
public static void main(String[] args) throws IOException {

// 第一种: 使用FileReader和FileWrite,一次读取一个字符
		FileReader fr = new FileReader("D:\\a.txt");
		FileWriter fw = new FileWriter("D:\\b.txt");
		int ch;
		while((ch = fr.read()) != -1) {
			fw.write(ch);
		}
		fw.close();
		fr.close();

// 第二种: 使用FileReader和FileWrite,一次读取一个字符数组
		FileReader fr = new FileReader("D:\\a.txt");
		FileWriter fw = new FileWriter("D:\\b.txt");
		char[] chs = new char[1024];
		int len;
		while((len = fr.read(chs)) != -1) {
			fw.write(chs, 0, len);
		}
		fw.close();
		fr.close();

// 第三种: 使用FileOutputStream和FileInputStream,一次读取一个字节
		FileInputStream fis = new FileInputStream("D:\\a.txt");
		FileOutputStream fos = new FileOutputStream("D:\\b.txt");
		int ch;
		while((ch = fis.read()) != -1) {
			fos.write(ch);
		}
		fos.close();
		fis.close();

// 第四种: 使用FileOutputStream和FileInputStream,一次读取一个字节数组
		FileInputStream fis = new FileInputStream("D:\\a.txt");
		FileOutputStream fos = new FileOutputStream("D:\\b.txt");
		int ch;
		byte[] by = new byte[1024];
		while((ch = fis.read(by)) != -1) {
			fos.write(by, 0, ch);
		}
		fos.close();
		fis.close();

// 第五种: 使用BufferedReader和BufferedWriter,一次读取一行
		BufferedReader br = new BufferedReader(new FileReader("D:\\a.txt"));
		BufferedWriter bw = new BufferedWriter(new FileWriter("D:\\b.txt"));
		String line;
		while((line = br.readLine()) != null) {
			bw.write(line);
			bw.newLine();
			bw.flush();
		}
		bw.close();
		br.close();

// 第六种: 使用高效缓冲流,BufferedInputStream和BufferedOutputStream,一次读取一个字节
		BufferedInputStream bis = new BufferedInputStream(new FileInputStream("D:\\a.txt"));
		BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("D:\\b.txt"));
		int ch;
		while((ch = bis.read()) != -1) {
			bos.write(ch);
		}
		bos.close();
		bis.close();

// 第七种: 使用高效缓冲流,BufferedInputStream和BufferedOutputStream,一次读取一个字节数组
		BufferedInputStream bis = new BufferedInputStream(new FileInputStream("D:\\a.txt"));
		BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("D:\\b.txt"));
		int ch;
		byte[] by = new byte[1024];
		while((ch = bis.read(by)) != -1) {
			bos.write(by, 0, ch);
		}
		bos.close();
		bis.close();

// 第八种: 使用转换流 OutputStreamWrite和InputSreamReader,一次读取一个字符
                FileInputStream fis = new FileInputStream("D:\\a.txt");
		InputStreamReader isr = new InputStreamReader(fis);
		
		FileOutputStream fos = new FileOutputStream("D:\\b.txt");
		OutputStreamWriter osw = new OutputStreamWriter(fos);
		int len;
		while((len = isr.read()) != -1) {
			osw.write((char)len);
		}
		isr.close();
		osw.close();

// 第九种: 使用转换流 OutputStreamWrite和InputSreamReader,一次读取一个字符数组
		FileInputStream fis = new FileInputStream("D:\\a.txt");
		InputStreamReader isr = new InputStreamReader(fis);
		
		FileOutputStream fos = new FileOutputStream("D:\\b.txt");
		OutputStreamWriter osw = new OutputStreamWriter(fos);
		int len;
		char[] by = new char[1024];
		while((len = isr.read(by)) != -1) {
			osw.write(by, 0, len);
		}
		isr.close();
		osw.close();

}
}