Android java, 快速文件拷贝，文件压缩，获得系统时间

1. 最快速度的文件拷贝，管道对管道。

  /**
    * Create report file.
    * @param srcFile
    * @param dstFile
    */
    private void CreateReportFile(String srcFile, String dstFile) {
        int length = 1048891;
        FileChannel inC = null;
        FileChannel outC = null;
        try {

            FileInputStream in = new FileInputStream(srcFile);
            FileOutputStream out = new FileOutputStream(dstFile);
            inC = in.getChannel();
            outC = out.getChannel();
            ByteBuffer b = null;
            while (inC.position() < inC.size()) {
                if ((inC.size() - inC.position()) < length) {
                    length = (int) (inC.size() - inC.position());
                } else
                    length = 1048891;
                b = ByteBuffer.allocateDirect(length);
                inC.read(b);
                b.flip();
                outC.write(b);
                outC.force(false);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (inC != null && inC.isOpen()) {
                    inC.close();
                }
                if (outC != null && outC.isOpen()) {
                    outC.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

2. 文件压缩, zip

    /**
     *
     * @param file
     * @param zipfile
     */
    private void zipFile(String file, String zipfile) {
        try {
            FileInputStream in = new FileInputStream(file);
            FileOutputStream out = new FileOutputStream(zipfile);
            ZipOutputStream zipOut = new ZipOutputStream(out);
            ZipEntry entry = new ZipEntry(file);
            zipOut.putNextEntry(entry);
            int nNumber;
            byte[] buffer = new byte[512];
            while ((nNumber = in.read(buffer)) != -1)
                zipOut.write(buffer, 0, nNumber);
            zipOut.close();

            out.close();
            in.close();

        } catch (IOException e) {
            System.out.println(e);
        }
    }

3. 获得系统时间。

    /**
     * @param sPath
     * @return
     */
    private void deleteFile(String sPath) {
        File file = new File(sPath);
        if (file.isFile() && file.exists()) {
            file.delete();
        }
    }