package com.zcloud.util;

import java.io.BufferedOutputStream;
import java.io.OutputStream;
import java.net.URLEncoder;

import javax.servlet.http.HttpServletResponse;

/**
 * 说明：下载文件
 * 作者：luoxiaobao
 * 官网：www.qdkjchina.com
 */
public class FileDownload {

	/**
	 * @param response
	 * @param filePath		//文件完整路径(包括文件名和扩展名)
	 * @param fileName		//下载后看到的文件名
	 * @return  文件名
	 */
	public static void fileDownload(final HttpServletResponse response, String filePath, String fileName) throws Exception{
		byte[] data = FileUtil.toByteArray2(filePath);
		if(Tools.isEmpty(fileName)){
			fileName =  "导出模板.xls";
		}
	    fileName = URLEncoder.encode(fileName, "UTF-8");
	    response.reset();
	    response.setHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");
	    response.addHeader("Content-Length", "" + data.length);
	    response.setContentType("application/octet-stream;charset=UTF-8");
	    OutputStream outputStream = new BufferedOutputStream(response.getOutputStream());
	    outputStream.write(data);
	    outputStream.flush();
	    outputStream.close();
	    response.flushBuffer();
	}

	/** 体系文件使用
	 * @param response
	 * @param filePath		//文件完整路径(包括文件名和扩展名)
	 * @param fileName		//下载后看到的文件名
	 * @return  文件名
	 */
	public static void mfFileDownload(final HttpServletResponse response, String filePath, String fileName) throws Exception{
		byte[] data = FileUtil.toByteArray4(filePath);
	    fileName = URLEncoder.encode(fileName, "UTF-8");
	    response.reset();
	    response.setHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");
	    response.addHeader("Content-Length", "" + data.length);
	    response.setContentType("application/octet-stream;charset=UTF-8");
	    OutputStream outputStream = new BufferedOutputStream(response.getOutputStream());
	    outputStream.write(data);
	    outputStream.flush();
	    outputStream.close();
	    response.flushBuffer();
	}

}