package mons.file;
import java.io.UnsupportedEncodingException;
.....
/ ^v^ ** * @version 創建時間：Dec 16, 3:26:41 PM
類說明：多文件上傳
*
*/
public class MutiFileUpload extends HttpServlet {
private static final long serialVersionUID =
670829239023754119L;
private long sizeMax = -1; //
上傳文件大小(單位：字節byte)，為-1時，無限制
private String encoding = "utf-8";//
字元編碼，當讀取上傳表單的各部分時會用到該encoding
//緩沖值,
默認是1024*10,即10K
private int sizeThreshold =
DiskFileItemFactory.DEFAULT_SIZE_THRESHOLD;
public Map parameters;// 保存表單參數
public Map files;// 保存上傳的檔
public boolean uploadError = false; //
上傳是否有錯，漠認是沒錯false
/^v^**
* 解析request
*
* @param request
*/
public void parse(HttpServletRequest request)
{
parameters = new
HashMap();
files = new HashMap();
// Create a factory for
disk-based file items
DiskFileItemFactory factory =
new DiskFileItemFactory();
// Set factory
constraints
factory.setSizeThreshold(sizeThreshold);
//
factory.setRepository(repository);
// Create a new file upload
handler
ServletFileUpload upload = new
ServletFileUpload(factory);
// Set overall request size
constraint
upload.setSizeMax(sizeMax);
upload.setHeaderEncoding(encoding);
try {
List items =
upload.parseRequest(request);
Iterator
iterator = items.iterator();
while
(iterator.hasNext()) {
FileItem
item = (FileItem) iterator.next();
if
(item.isFormField()) {
String
fieldName = item.getFieldName();
String
value = item.getString();
parameters.put(fieldName,
value);
}
else {
String
fieldName = item.getFieldName();
files.put(fieldName,
item);
}
}
} catch (FileUploadException e)
{
e.printStackTrace();
this.setUploadError(true);//
設為出錯
}
}
/ ^v^**
* 取得非文件表單的值
* @param key
* @return
*/
public String getParameter(String key) {
return (parameters == null) ?
null : (String) parameters.get(key);
}
public String getParameter(String key, String
encoding) {
if (parameters == null)
return
null;
String value = (String)
parameters.get(key);
try {
if (value !=
null) {
value
= new String(value.getBytes("ISO-8859-1"), encoding);
}
} catch
(UnsupportedEncodingException e) {
e.printStackTrace();
}
return value;
}
/^v^**
* 得到上傳檔的檔案名
*
* @param item
*
* @return
*
*/
public String getFileName(FileItem item) {
String fileName =
item.getName();
fileName =
this.replace(fileName, "\", "/");
fileName =
fileName.substring(fileName.lastIndexOf("/") + 1);
return fileName;
}
/^v^**
* 獲得檔擴展
*
* @param item
* @return
*/
public String getFileExtension(FileItem item)
{
String fileName =
getFileName(item);
fileName =
fileName.substring(fileName.lastIndexOf("."));
return fileName;
}
/^v^**
* 驗證單個的文件是否超過最大值
* @param item
* @param defalutMaxSize
* @return true-正常， false-超過最大值
*/
public boolean checkMaxSize(FileItem item, long
defalutMaxSize){
if(defalutMaxSize == -1){
return
true;
}
return (item.getSize()
<= defalutMaxSize);
}
/^v^**
* 字串替
*
* @param source
*
* @param oldString
*
* @param newString
*
* @return
*
*/
public static String replace(String source,
String oldString, String newString) {
StringBuffer output = new
StringBuffer();
int lengthOfSource =
source.length();
int lengthOfOld =
oldString.length();
int posStart = 0;
int pos;
while ((pos =
source.indexOf(oldString, posStart)) >= 0) {
output.append(source.substring(posStart,
pos));
output.append(newString);
posStart =
pos + lengthOfOld;
}
if (posStart <
lengthOfSource) {
output.append(source.substring(posStart));
}
return output.toString();
}
//getter and setter
}
