java中复制文件的效率测试

来源：互联网发布：社交网络头像编辑：程序博客网时间：2024/05/20 14:27

项目中用到了图片的上传，对于上传过程中，图片的复制项目组用了两种方法，一种是以java的IO流，另外一种是用org.apache.commons.io.FileUtils的工具类，今天我测试了一下，单纯考虑文件的复制效率，apache的工具类的效率是普通io流读取的3倍。

下面是测试源码：

public class ImageTest {public static void main(String[] args) throws IOException {IOTest();}public static void fileUtilsTest() throws IOException {// 趋近13毫秒后，就保持这个数值File srcFile = new File("D:/1.apk");File destFile = new File("E:/2.apk");long sum = 0;for (int i = 0; i < 10; i++) {long startTime = System.currentTimeMillis();FileUtils.copyFile(srcFile, destFile);long endTime = System.currentTimeMillis();sum += (endTime - startTime);}long average = sum / 10;System.out.println("耗时" + average + "豪秒");}public static void IOTest() throws IOException {// 50毫秒File srcFile = new File("D:/1.apk");File destFile = new File("E:/2.apk");long sum = 0;for (int i = 0; i < 10; i++) {long startTime = System.currentTimeMillis();InputStream is = new FileInputStream(srcFile);// 把图片写入到上面设置的路径里OutputStream os = new FileOutputStream(destFile);byte[] buffer = new byte[400];int length = 0;while ((length = is.read(buffer)) > 0) {os.write(buffer, 0, length);}is.close();os.close();long endTime = System.currentTimeMillis();sum += (endTime - startTime);}long average = sum / 10;System.out.println("耗时" + average + "豪秒");}}

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