用apache common io包获得文件扩展名
apache common io包包含了很多非常实用的工具类，比如连获得文件的扩展名都有了，比如：
import org.apache.commons.io.FilenameUtils;
String extension = FilenameUtils.getExtension(fileName);if (extension.equals("zip") || extension.equals("bar")) {ZipInputStream zip = new ZipInputStream(fileInputStream);repositoryService.createDeployment().addZipInputStream(zip).deploy();
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