http://www.iteye.com/topic/409525
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package test; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; public class TestIO03 { /** * @param args * @throws IOException */ public static void main(String[] args) throws IOException { InputStream ins = new FileInputStream( "E:\\tools\\FreeMind-Windows-Installer-0.8.1-max.exe"); OutputStream ous = new FileOutputStream( "D:\\FreeMind-Windows-Installer-0.8.1-max.exe_bk"); byte[] contents = new byte[ins.available()]; long start = System.currentTimeMillis(); // 读取文件 int i = 0; int count = 0; while ((i = ins.read()) != -1) { contents[count] = (byte) i; count++; } long end = System.currentTimeMillis(); System.out.println("读取耗时：" + (end - start) + "毫秒"); start = System.currentTimeMillis(); // 输出文件 for (int j = 0; j < contents.length; j++) { ous.write(contents[j]); } end = System.currentTimeMillis(); System.out.println("读取耗时：" + (end - start) + "毫秒"); ins.close(); ous.flush(); ous.close(); } } |
执行结果如下：
读取耗时：13329毫秒
读取耗时：16083毫秒
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InputStream ins = new FileInputStream( "E:\\tools\\FreeMind-Windows-Installer-0.8.1-max.exe"); OutputStream ous = new FileOutputStream( "D:\\FreeMind-Windows-Installer-0.8.1-max.exe_bk"); long start = System.currentTimeMillis(); int i = 0; while ((i = ins.read()) != -1) { ous.write(i); } long end = System.currentTimeMillis(); System.out.println("耗时：" + (end - start) + "毫秒"); ins.close(); ous.flush(); ous.close(); |
执行结果如下：
耗时：30013毫秒
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InputStream ins = new FileInputStream( "E:\\tools\\FreeMind-Windows-Installer-0.8.1-max.exe"); OutputStream ous = new FileOutputStream( "D:\\FreeMind-Windows-Installer-0.8.1-max.exe_bk"); byte[] contents = new byte[ins.available()]; long start = System.currentTimeMillis(); ins.read(contents); ous.write(contents); long end = System.currentTimeMillis(); System.out.println("耗时：" + (end - start) + "毫秒"); ins.close(); ous.flush(); ous.close(); |
执行结果如下：
耗时：2384毫秒
