package xin.glue.ui.common.blob;

import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.PageContext;

import com.posdata.glue.biz.constants.PosBizControlConstants;
import com.posdata.glue.biz.control.PosBizProvider;
import com.posdata.glue.context.PosContext;
import com.posdata.glue.web.control.PosWebConstants;

public abstract class PosBolbManager {
	protected HttpServletRequest request;
	private HttpServletResponse response;
	private JspWriter out;
	private PageContext pageContext;
	protected List dataList = new ArrayList();

	public PosBolbManager(HttpServletRequest request,
			HttpServletResponse response, JspWriter out, PageContext pageContext) {
		super();
		this.request = request;
		this.response = response;
		this.out = out;
		this.pageContext = pageContext;
	}

	public void getContext() throws Exception {
		PosContext context = new PosContext();
		request.setAttribute(PosWebConstants.CONTEXT, context);
		context.put(PosBizControlConstants.SERVICE_NAME, request.getParameter("ServiceName"));
		context.setRequestParameters(request.getParameterMap());
		HashMap map = new HashMap();
		for (Enumeration enum1 = request.getAttributeNames(); enum1.hasMoreElements();) {
			String key = (String) enum1.nextElement();
			map.put(key, request.getAttribute(key));
		}
		context.setRequestAttr(map);
		PosBizProvider.getController().doAction(context);

		String[] resultKeys;
		if (request.getParameter("resultKey") != null) {
			resultKeys = request.getParameter("resultKey").split("\\|");
		} else {
			resultKeys = (String[])context.get("ResultKeyList");
		}
		for (int i = 0, length = resultKeys.length; i < length; i++) {
			Object obj = context.get(resultKeys[i]);
			if (obj != null)
				dataList.add(obj);
		}

		response.reset();
		// 这行设定本网页为excel格式的网页
		// application/ms-excel、application/ms-word、application/ms-txt、application/ms-html 或其他浏览器可直接支持文档 
		response.setContentType("application/ms-excel;charset=UTF-8");
		// 线上浏览的方式(为能多次打开，使用时间作为文件名)：
		response.setHeader("Content-disposition", "inline; filename=" + (new SimpleDateFormat("yyyyMMddhhmmss")).format(new Date()) + ".xls");
		// 下载的方式：
		// response.setHeader("Content-disposition", "attachment; filename=test2.xls");
		OutputStream os = response.getOutputStream();
		setContext(os);
		os.flush();
		os.close();// *important* to ensure no more jsp output
		os = null;
//		response.flushBuffer();
		out.clear();
		out.close();
		out = pageContext.pushBody();
	}

	protected abstract void setContext(OutputStream os) throws Exception;
}