一个backup的例子

用处：就是export-db.bat，然后保存在一个xml里面，做数据备份。

适用范围：springside的dbunit

	private static final int BUFF_SIZE = 16 * 1024;

	private Logger logger = LoggerFactory.getLogger(getClass());

	@Autowired
	private DataSource dataSource;

	/**
	 * 保存到Config配置的目录下面。
	 * 
	 * @return 压缩文件的文件名
	 */
	public File doBackup() {
		logger.debug("{}开始备份操作", SpringSecurityUtils.getCurrentUserName());
		try {
			FileUtils.forceMkdir(new File(Config.SYS_BACKUP_PATH));
		} catch (IOException e) {
			logger.error("创建备份目录失败", e);
			return null;
		}

		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd_HH-mm-ss");
		String title = sdf.format(new Date());
		File xmlFile = new File(Config.SYS_BACKUP_PATH, title + ".xml");
		File zipFile = new File(Config.SYS_BACKUP_PATH, title + "-bak.zip");

		//export to xml
		exportDatabase(xmlFile);

		//zip it
		try {
			zipFile(xmlFile, zipFile);
		} catch (IOException e) {
			logger.error("创建xml压缩文件失败:" + xmlFile.getAbsolutePath(), e);
			return null;
		}

		//delete xml
		try {
			FileUtils.forceDelete(xmlFile);
		} catch (IOException e) {
			logger.error("删除临时xml文件失败:" + xmlFile.getAbsolutePath(), e);
			return null;
		}

		logger.debug("{}备份操作成功:{}", SpringSecurityUtils.getCurrentUserName(), zipFile.getAbsolutePath());
		return zipFile;
	}

	// 打包xml
	private void zipFile(File xmlFile, File zipFile) throws IOException {
		// 使用缓冲流，速度快
		ZipOutputStream zos = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(zipFile), BUFF_SIZE));
		BufferedInputStream bis = new BufferedInputStream(new FileInputStream(xmlFile), BUFF_SIZE);
		byte buffer[] = new byte[BUFF_SIZE];
		zos.putNextEntry(new ZipEntry(xmlFile.getName()));
		int length = 0;
		while ((length = bis.read(buffer)) != -1) {
			zos.write(buffer, 0, length);
		}
		bis.close();
		zos.flush();
		zos.close();
	}

	private void exportDatabase(File xmlFile) {
		Connection conn = null;
		try {
			conn = dataSource.getConnection();
			IDatabaseConnection connection = new DatabaseConnection(conn);
			exportDatabase(connection, xmlFile, true, true);
		} catch (Exception e) {
			logger.error("DBUnit Export XML 失败:" + xmlFile.getAbsolutePath(), e);
		} finally {
			try {
				if (conn != null && !conn.isClosed()) {
					conn.close();
				}
			} catch (SQLException e) {
				logger.error("备份后关闭数据库连接失败", e);
			}
		}

	}

	private void exportDatabase(IDatabaseConnection connection, File file, boolean streamed, boolean flat)
			throws Exception {
		if (streamed) {
			connection.getConfig().setProperty(DatabaseConfig.PROPERTY_RESULTSET_TABLE_FACTORY,
					new ForwardOnlyResultSetTableFactory());
		}
		
		IDataSet fullDataSet = connection.createDataSet();
		FileOutputStream stream = new FileOutputStream(file);
		if (flat)
			FlatXmlDataSet.write(fullDataSet, stream);
		else
			//格式化后的xml
			XmlDataSet.write(fullDataSet, stream);
		stream.close();
	}