package org.nutz.mvc.upload;
import java.util.Enumeration;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import org.nutz.lang.util.NutMap;
import org.nutz.mvc.Mvcs;
/**
* 关于上传的一些帮助函数
*
* @author zozoh(zozohtnt@gmail.com)
*/
public abstract class Uploads {
/**
* @param req
* 请求对象
* @return 当前会话的上传进度对象，如果没有上传，则返回 null
*/
public static UploadInfo getInfo(HttpServletRequest req) {
HttpSession session = Mvcs.getHttpSession(false);
if (session == null)
return null;
return (UploadInfo) session.getAttribute(UploadInfo.SESSION_NAME);
}
/**
* @param req
* 请求对象
* @return 本次上传的进度对象
*/
public static UploadInfo createInfo(HttpServletRequest req) {
UploadInfo info = new UploadInfo();
HttpSession sess = Mvcs.getHttpSession(false);
if (null != sess) {
sess.setAttribute(UploadInfo.SESSION_NAME, info);
}
info.sum = req.getContentLength();
return info;
}
/**
* 根据请求对象创建参数 MAP， 同时根据 QueryString，为 MAP 设置初始值
*
* @param req
* 请求对象
* @return 参数 MAP
*/
public static NutMap createParamsMap(HttpServletRequest req) {
NutMap params = new NutMap();
// parse query strings
Enumeration<?> en = req.getParameterNames();
while (en.hasMoreElements()) {
String key = en.nextElement().toString();
params.put(key, req.getParameter(key));
}
return params;
}
/**
* 从当前会话中移除进度对象
*
* @param req
* 请求对象
*/
public static void removeInfo(HttpServletRequest req) {
req.removeAttribute(UploadInfo.SESSION_NAME);
}
}