comm-fileupload教程

FileUpload获取表单中参数的方法并对该组件做了进一点封装，使其更容易使用，并支持单文件上传和多文件上传两种方式，首先定义一个基类放置公共属性： FileUploadBase.java import java.io.File; import java.util.HashMap; import java.util.Map; import org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.disk.DiskFileItemFactory; public abstract class FileUploadBase { protected Map<String, String> parameters = new HashMap<String, String>();// 保存普通form表单域 protected String encoding = "utf-8"; // 字符编码，当读取上传表单的各部分时会用到该encoding protected UploadFileFilter filter = null; // 文件过滤器, 默认为NULL 不过滤 /** * 设置内存中缓存大小。 */ protected int sizeThreshold = DiskFileItemFactory.DEFAULT_SIZE_THRESHOLD; /** * The maximum size permitted for the complete request, as opposed to *{@link #fileSizeMax}. A value of -1 indicates no maximum.* */ protected long sizeMax = -1; /** * 在sizeThreshold超出缓存区时临时保存的文件目录 */ protected File repository; public String getParameter(String key) { return parameters.get(key); } public String getEncoding() { return encoding; } public void setEncoding(String encoding) { this.encoding = encoding; } /** * 获取上传文件最大的大小，单位为Byte(字节），为-1时表示无限制 * @return */ public long getSizeMax() { return sizeMax; } /** * 设置上传文件最大的大小，单位为Byte(字节），为-1时表示无限制 * @param sizeMax */ public void setSizeMax(long sizeMax) { this.sizeMax = sizeMax; } public int getSizeThreshold() { return sizeThreshold; } public void setSizeThreshold(int sizeThreshold) { this.sizeThreshold = sizeThreshold; } /** * Returns the directory used to temporarily store files that are larger * than the configured size threshold. * * @return The directory in which temporary files will be located. * * @see #setRepository(java.io.File) * */ public File getRepository() { return repository; } /** * Sets the directory used to temporarily store files that are larger than * the configured size threshold. * * @param repository * The directory in which temporary files will be located. * * @see #getRepository() * */ public void setRepository(File repository) { this.repository = repository; } /** * 获取参数列表 * @return */ public Map<String, String> getParameters() { return parameters; } /** * 获取过滤器 * @return */ public UploadFileFilter getFilter() { return filter; } /** * 设置文件过滤器，不符合过滤器规则的将不被上传 * @param filter */ public void setFilter(UploadFileFilter filter) { this.filter = filter; } /** * 验证文件是否有效 * @param item * @return */ protected boolean isValidFile(FileItem item){ return item == null || item.getName() == "" || item.getSize() == 0 || (filter != null && !filter.accept(item.getName())) ? false : true; } }