struts 1 中服务器端限制文件上传的类型及扩展名
src下建个properties文件，放置允许上传的文件类型：
allowuploadfiletype.propertiesgif=image/gifjpg=image/jpg,image/jpeg,image/pjpegbmp=image/bmppng=image/pngswf=application/x-shockwave-flashdoc=application/mswordtxt=text/plainxls=application/vnd.ms-excelppt=application/vnd.ms-powerpointpdf=application/pdfexe=application/octet-stream
?在BaseForm 里面写具体的验证方法：
import java.io.IOException;import java.util.ArrayList;import java.util.Arrays;import java.util.List;import java.util.Properties;import org.apache.struts.action.ActionForm;import org.apache.struts.upload.FormFile;public class BaseForm extends ActionForm { private static Properties properties = new Properties(); static{ try { properties.load(BaseForm.class.getClassLoader().getResourceAsStream("allowuploadfiletype.properties")); } catch (IOException e) { e.printStackTrace(); } } /** * 获取文件扩展名 * @param formfile * @return */ public static String getExt(FormFile formfile) { return formfile.getFileName().substring( formfile.getFileName().lastIndexOf('.') + 1).toLowerCase(); } /** * 验证上传文件是否属于图片/flash动画/word文件/exe文件/pdf文件/TxT文件/xls文件/ppt文件 * * @param formfile * @return */ public static boolean validateFileType(FormFile formfile) { if (formfile != null && formfile.getFileSize() > 0) { String ext = getExt(formfile); List<String> allowType = new ArrayList<String>(); for (Object key : properties.keySet()) { String value = (String) properties.get(key); String[] values = value.split(","); for (String v : values) { allowType.add(v.trim()); } } return allowType.contains(formfile.getContentType().toLowerCase()) && properties.keySet().contains(ext); } return true; }}?