package com.java.controller;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.net.URLEncoder;
import java.util.List;

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

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.servlet.ModelAndView;

/***
 * 文件上传控制类
 * @author swinglife
 *
 */
@Controller
@RequestMapping("/files")
public class FileUploadController {
	//通过Spring的autowired注解获取spring默认配置的request
	@Autowired
	private HttpServletRequest request;
	

	 @RequestMapping("/download/{fileName:.+}")
	 public void download(@PathVariable String fileName,String fileOldName, HttpServletRequest request, HttpServletResponse response) throws Exception {
           BufferedInputStream bis = null;
			BufferedOutputStream bos = null;  
			//获取下载文件露肩       转码方法   .getBytes("iso-8859-1"), "utf-8"
			String downLoadPath = request.getSession().getServletContext().getRealPath("/") + "upload\\"+ new String(fileName); 
			//获取文件的长度  
			long fileLength = new File(downLoadPath).length();  
			//设置文件输出类型  
			response.setCharacterEncoding("utf-8");  
	        response.setContentType("multipart/form-data"); 
			response.setHeader("Content-disposition", "attachment; filename="
			        + URLEncoder.encode(fileOldName, "UTF-8"));
			//设置输出长度
			response.setHeader("Content-Length", String.valueOf(fileLength));  
			//获取输入流  
			bis = new BufferedInputStream(new FileInputStream(downLoadPath));
			//输出流  
			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);  
			}
			//关闭流
			bis.close();  
			bos.close();
	} 
	/***
	 * 上传文件 用@RequestParam注解来指定表单上的file为MultipartFile
	 * 
	 * @param file
	 * @return
	 */
	@RequestMapping("fileUpload")
	public String fileUpload(@RequestParam("file") MultipartFile file) {
		// 判断文件是否为空
		if (!file.isEmpty()) {
			try {
				// 文件保存路径
				String filePath = request.getSession().getServletContext().getRealPath("/") + "upload/"
						+ file.getOriginalFilename();
				// 转存文件
				file.transferTo(new File(filePath));
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
		// 重定向
		return "redirect:/filesUpload.jsp";
	}

	/***
	 * 读取上传文件中得所有文件并返回
	 * 
	 * @return
	 */
	@RequestMapping("list")
	public ModelAndView list() {
		String filePath = request.getSession().getServletContext().getRealPath("/") + "upload/";
		ModelAndView mav = new ModelAndView("list");
		File uploadDest = new File(filePath);
		String[] fileNames = uploadDest.list();
		for (int i = 0; i < fileNames.length; i++) {
			System.out.println(fileNames[i]);
		}
		return mav;
	}
}