Java字节流复制文件

1、使用带缓冲功能的字节流复制文件

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class BufferByteStreamCopy {

public static void main(String[] args) {

        BufferedInputStream bufis = null;
        BufferedOutputStream bufos = null;

try {
            bufis = new BufferedInputStream(new FileInputStream("C:\\1.txt"));
            bufos = new BufferedOutputStream(new FileOutputStream("D:\\1.txt"));

            int b = 0;
while ((b = bufis.read()) != -1) {
                bufos.write(b);
            }


        } catch (IOException e) {
throw new RuntimeException("拷贝失败");
        } finally {
try {
if (bufis != null)
                    bufis.close();
            } catch (IOException e) {
throw new RuntimeException("读取关闭失败");
            }
try {
if (bufos != null)
                    bufos.close();
            } catch (IOException e) {
throw new RuntimeException("写入关闭失败");
            }
        }
    }

}

2、使用不带缓冲功能的字节流复制文件

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class NoBufferByteStreamCopy {

public static void main(String[] args) {
        FileInputStream fis = null;
        FileOutputStream fos = null;

try {
            fis = new FileInputStream("C:\\1.txt");
            fos = new FileOutputStream("D:\\1.txt");

byte[] buf = new byte[1024];
int len = 0;
while ((len = fis.read(buf)) != -1) {
                fos.write(buf, 0, len);
            }

        } catch (IOException e) {
throw new RuntimeException("拷贝失败");
        } finally {
try {
if (fis != null)
                    fis.close();
            } catch (IOException e) {
throw new RuntimeException("读取关闭失败");
            }
try {
if (fos != null)
                    fos.close();
            } catch (IOException e) {
throw new RuntimeException("写入关闭失败");
            }
        }
    }

}