package kimoji;
import java.io.*;
public class FileTest {
public static void main(String[] args) throws IOException {
out1("D:\\ppt\\Oracle_SQL基礎知識.ppt", "aaa.ppt"); out2("D:\\ppt\\Oracle_SQL基礎知識.ppt", "aaa1.ppt"); out3("D:\\ppt\\Oracle_SQL基礎知識.ppt", "aaa11.ppt"); out4("D:\\ppt\\Oracle_SQL基礎知識.ppt", "aaa111.ppt");/*if (file.exists() && file.isDirectory()) { String names[] = file.list(); for (String name : names) { System.out.println(name); } System.out.println("000000000000000000000000000000000000000000000000000000000000000000000000"); String[] nameNei = file.list(new FilenameFilter() { @Override public boolean accept(File dir, String name) { return name.endsWith(".java"); } }); for (String string : nameNei) { System.out.println(string); } }*/
} /** * 一次读取一个字节 * @param src1 ：读取路径 * @param src2 ：写入路径 * @throws IOException */ public static void out1(String src1,String src2) throws IOException{ FileInputStream fileInputStream = new FileInputStream(src1); FileOutputStream fOutputStream = new FileOutputStream(src2); int len = -1; Long star = System.currentTimeMillis(); while((len = fileInputStream.read())!=-1){ fOutputStream.write(len); } long end = System.currentTimeMillis(); System.out.println("out1耗时为："+(end-star)+"毫秒"); fileInputStream.close(); fOutputStream.close(); } /** * 一次读取一个字节数组 * @param str1:读取路径 * @param str2:写入路径 * @throws IOException */ public static void out2(String str1,String str2) throws IOException{ FileInputStream fis = new FileInputStream(str1); FileOutputStream fos = new FileOutputStream(str2); int len = -1; byte temp [] = new byte[1024]; Long star = System.currentTimeMillis(); while((len = fis.read())!=-1){ fos.write(temp, 0, len); } long end = System.currentTimeMillis(); System.out.println("out2耗时为："+(end-star)+"毫秒"); fis.close(); fos.close(); } /** * 带有缓冲区的一次读取一个字节 * @param src1 ：读取路径 * @param src2 ：写入路径 * @throws IOException */ public static void out3(String str1,String str2) throws IOException{ BufferedInputStream bis = new BufferedInputStream(new FileInputStream(str1)); BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(str2)); int len = -1; Long star = System.currentTimeMillis(); while((len=bis.read())!=-1){ bos.write(len); } Long end = System.currentTimeMillis(); System.out.println("out3共耗时"+(end-star)+"毫秒"); bis.close(); bos.close(); } public static void out4(String str1,String str2) throws IOException{ BufferedInputStream bis = new BufferedInputStream(new FileInputStream(str1)); BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(str2)); int len = -1; byte [] temp = new byte[1024]; Long star = System.currentTimeMillis(); while((len = bis.read())!=-1){ bos.write(temp, 0, len); } Long end = System.currentTimeMillis(); System.out.println("out4共耗时"+(end-star)+"毫秒"); bis.close(); bos.close(); }}
用韵结果如下：
out1耗时为：6431毫秒
out2耗时为：6223毫秒out3共耗时28毫秒out4共耗时197毫秒