package com.infrastructure.project.common.util;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.infrastructure.project.common.SysConstant;

public class DownLoadUtil {
	/**
	 * 
	 * @param response
	 * @param request
	 * @param filePath
	 * @param fileName
	 * @param type
	 * @throws IOException
	 */
 public static void downLoad(HttpServletResponse response,HttpServletRequest request,String filePath ,String fileName,String type) throws IOException {
		response.setContentType("text/html;charset=utf-8");
		request.setCharacterEncoding("UTF-8");
		java.io.BufferedInputStream bis = null;
		java.io.BufferedOutputStream bos = null;
		try {
			File file = null;
			if(SysConstant.downLoadType.DOWNLOAD_PDF.equals(type) || type == SysConstant.downLoadType.DOWNLOAD_PDF){
				file = new File(filePath+fileName+SysConstant.nameSuffix.NAMESUFFIX_PDF);
			}else if(SysConstant.downLoadType.DOWNLOAD_EXCEL.equals(type) || type == SysConstant.downLoadType.DOWNLOAD_EXCEL){
				file = new File(filePath+fileName+SysConstant.nameSuffix.NAMESUFFIX_EXCEL);
			}else if(SysConstant.downLoadType.DOWNLOAD_WORD.equals(type) || type == SysConstant.downLoadType.DOWNLOAD_WORD){
				file = new File(filePath+fileName+SysConstant.nameSuffix.NAMESUFFIX_WORD);
			}else if(SysConstant.downLoadType.DOWNLOAD_ZIP.equals(type) || type == SysConstant.downLoadType.DOWNLOAD_ZIP){
				file = new File(filePath+fileName+SysConstant.nameSuffix.NAMESUFFIX_ZIP);
			}else if(SysConstant.downLoadType.DOWNLOAD_TXT.equals(type) || type == SysConstant.downLoadType.DOWNLOAD_TXT){
				file = new File(filePath+fileName+SysConstant.nameSuffix.NAMESUFFIX_TXT);
			}else{
				file = new File(filePath+fileName+SysConstant.nameSuffix.NAMESUFFIX_HTML);
			}
			long fileLength = file.length();
			response.setContentType("application/x-msdownload;");
			response.setHeader("Content-disposition", "attachment; filename="+ new String(file.getName().getBytes("utf-8"), "ISO8859-1"));
			response.setHeader("Content-Length", String.valueOf(fileLength));
			bis = new BufferedInputStream(new FileInputStream(file));
			bos = new BufferedOutputStream(response.getOutputStream());
			byte[] buff = new byte[2048];
			int bytesRead;
			while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
				bos.write(buff, 0, bytesRead);
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if (bis != null)
				bis.close();
			if (bos != null)
				bos.close();
		}
}
}