package com.spark.controller;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

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

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

@Controller
public class DownLondController {

	@RequestMapping("/show")
	public ModelAndView show(){
		System.out.println("show()...");
		ModelAndView model=new ModelAndView();
		model.setViewName("export");
		return model;
	}
	@RequestMapping("/file")
	public void exportFile(HttpServletRequest request,HttpServletResponse response){
		String fileName="体测成绩.xlsx";
		exportTemplate(request,response,fileName);
	}
	
	public void exportTemplate(HttpServletRequest request,HttpServletResponse response,String fileName){
		response.setContentType("application/vnd.ms-excel");
		String nowPath=request.getSession().getServletContext().getRealPath("/")+"/"+"WEB-INF"+"/"+"template"+"/"+fileName;
		File file=new File(nowPath);
		//清空response
		response.reset();
		OutputStream toClient=null;
		try {
			//设置response的header
			response.addHeader("Content-Disposition", "attachment;filename="+new String(fileName.getBytes("gbk"),"iso-8859-1"));
			response.addHeader("Content-Length", ""+file.length());
			//以流的形式下载文件
			InputStream fis=new BufferedInputStream(new FileInputStream(nowPath));
			byte[] buffer=new byte[fis.available()];
			fis.read(buffer);
			fis.close();
			
			toClient=new BufferedOutputStream(response.getOutputStream());
			toClient.write(buffer);
			toClient.flush();
			toClient.close();
		} catch (Exception e) {
			throw new RuntimeException("导出错误");
		}finally{
			if(toClient!=null){
				try {
					toClient.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			
		}
	}
}