web文件管理系统

package edu.cqu.common; import java.io.File; import java.io.InputStream; import java.io.UnsupportedEncodingException; import java.util.ArrayList; import java.util.Date; import java.util.Enumeration; import java.util.Hashtable; import java.util.List; import java.util.Set; import javax.servlet.http.HttpServletRequest; import org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.FileUploadException; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; import org.apache.log4j.Logger; public class MultipartRequest { private static Logger log = Logger.getLogger(MultipartRequest.class); private String charset = "UTF-8"; private Hashtable map = new Hashtable(); private HttpServletRequest request; private List fileItems = new ArrayList(); private boolean isMultipart; public MultipartRequest(HttpServletRequest request) { this(request, -1, -1, null); } // 通过构造函数限定附件使用的内存大小，最大的附件大小和临时目录 public MultipartRequest(HttpServletRequest request, int maxMemorySize, int maxFileSize, String tempDirectory) { this.charset = request.getCharacterEncoding(); log.info("charset:" + this.charset); this.request = request; // 判断该request对象是否包含多个部分，是否可以包含附件 isMultipart = ServletFileUpload.isMultipartContent(request); ServletFileUpload upload; DiskFileItemFactory factory; if (isMultipart) { // 使用FileUpload组件中的类 factory = new DiskFileItemFactory(); if (maxMemorySize > 10 * 1024) factory.setSizeThreshold(maxMemorySize); if (tempDirectory != null) factory.setRepository(new File(tempDirectory)); upload = new ServletFileUpload(factory); if (maxFileSize > 0) upload.setSizeMax(maxFileSize); try { fileItems = upload.parseRequest(request); } catch (FileUploadException e) { e.printStackTrace(); } for (int i = 0; i < fileItems.size(); i++) { FileItem item = (FileItem) fileItems.get(i); map.put(item.getFieldName(), item); } } else { Enumeration enu = request.getParameterNames(); while (enu.hasMoreElements()) { Object tmp = enu.nextElement(); if (tmp != null) map.put(tmp.toString(), request .getParameter(tmp.toString())); } } } public MultipartRequest(HttpServletRequest request, int maxMemorySize, int maxFileSize) { this(request, maxMemorySize, maxFileSize, null); } // 判断Request中是否包含name域 public boolean contains(String name) { String value = getString(name); return value != null; } public boolean equals(String name, String compareValue) { String value = getString(name); return (value != null) && value.equals(compareValue); } public boolean equalsIgnoreCase(String name, String compareValue) { String value = getString(name); return (value != null) && value.equalsIgnoreCase(compareValue); } // 从存储日期的域中，获得一个日期对象 public Date getDate(String name, String dateFormat) { String value = null; if (!isMultipart()) { value = request.getParameter(name); } else { value = getFieldValueFromMultiypartRequest(name); } Date result = DateUtil.parse(dateFormat, value); return result; } public double getDouble(String name) { return getDouble(name, -1); } public double getDouble(String name, double defaultValue) { String value = null; if (!isMultipart()) { value = request.getParameter(name); } else { value = getFieldValueFromMultiypartRequest(name); } double result = parseDouble(value); result = (result == -1) ? defaultValue : result; return result; } public double[] getDoubleArray(String name) { String[] value = getStringArray(name); double[] result = new double[value.length]; for (int i = 0; i < result.length; i++) { result[i] = parseDouble(value[i]); } return result; } // 从request对象的文件域获得文件流 public InputStream getFielInputStream(String fieldName) throws Exception { FileItem item = getFile(fieldName); return ((item != null) & !item.isFormField()) ? item.getInputStream() : null; } // 从request对象中，获得一个表示附件的FileItem对象 public FileItem getFile(String fieldName) { return (FileItem) map.get(fieldName); } // 返回文件域中存储的文件名 public String getFileName(String fieldName) { FileItem item = getFile(fieldName); String fname = (item != null) ? item.getName() : null; if ((fname != null) && (fname.length() > 0)) { fname = fname.substring(fname.lastIndexOf(File.separatorChar) + 1); } return fname; } public String[] getFileNames() { FileItem[] items = getFiles(); String[] result = new String[items.length]; for (int i = 0; i < items.length; i++) { result[i] = items[i].getName(); if ((result[i] != null) && (result[i].length() > 0)) { result[i] = result[i].substring(result[i] .lastIndexOf(File.separatorChar) + 1); } } return result; } public Set getParameterNamesSet() { return map.keySet(); } public Enumeration getParameterNames() { return map.keys(); } public long getFileSize(String fieldName) { FileItem item = getFile(fieldName); return (item != null) ? item.getSize() : 0; } // 返回文件域的数组 public FileItem[] getFiles() { ArrayList arr = new ArrayList(); for (int i = 0; i < fileItems.size(); i++) { FileItem item = (FileItem) fileItems.get(i); if (!item.isFormField()) { arr.add(item); } } FileItem[] result = new FileItem[arr.size()]; return (FileItem[]) arr.toArray(result); } public float getFloat(String name) { return getFloat(name, -1); } public float getFloat(String name, float defaultValue) { String value = null; if (!isMultipart()) { value = request.getParameter(name); } else { value = getFieldValueFromMultiypartRequest(name); } float result = parseFloat(value); result = (result == -1) ? defaultValue : result; return result; } public float[] getFloatArray(String name) { String[] value = getStringArray(name); float[] result = new float[value.length]; for (int i = 0; i < result.length; i++) { result[i] = parseFloat(value[i]); } return result; } public int getInt(String name) { return getInt(name, -1); } public int getInt(String name, int defaultValue) { String value = null; if (!isMultipart()) { value = request.getParameter(name); } else { value = getFieldValueFromMultiypartRequest(name); } int result = parseInt(value); result = result == -1 ? defaultValue : result; return result; } public int[] getIntArray(String name) { String[] value = getStringArray(name); int[] result = new int[value.length]; for (int i = 0; i < result.length; i++) { result[i] = parseInt(value[i]); } return result; } public long getLong(String name) { return getLong(name, -1); } public long getLong(String name, long defaultValue) { String value = null; if (!isMultipart()) { value = request.getParameter(name); } else { value = getFieldValueFromMultiypartRequest(name); } long result = parseLong(value); result = (result == -1) ? defaultValue : result; return result; } public long[] getLongArray(String name) { String[] value = getStringArray(name); long[] result = new long[value.length]; for (int i = 0; i < result.length; i++) { result[i] = parseLong(value[i]); } return result; } public boolean isMultipart() { return isMultipart; } public String getString(String name) { return getString(name, null); } public String getParameter(String name) { return getString(name, null); } public String getString(String name, String defaultValue) { String value = null; if (!isMultipart()) { value = request.getParameter(name); } else { value = getFieldValueFromMultiypartRequest(name); } value = (value == null) ? defaultValue : value; return value; } public String[] getStringArra