基于java文本复制的7种方式总结

如下所示：

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();

}
}

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