Java实现零拷贝

零拷贝指的是对CPU零消耗或者尽量少消耗。

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public static boolean copyFile(String sourcePath, String targetPath) {       try (FileChannel source = new FileInputStream(sourcePath).getChannel();          FileChannel target = new FileOutputStream(targetPath).getChannel()     ) {         long sourceSize = source.size();           for (long left = sourceSize; left > 0; ) {             left -= source.transferTo((sourceSize - left), left, target);         }       } catch (IOException e) {         e.printStackTrace();         return false;     }     return true; }