基于java文本复制的7种方式总结

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();

}}