package com.java.controller;

import java.io.File;
import java.util.List;

import javax.servlet.http.HttpServletRequest;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
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("filesUpload")
	public void filesUpload(@RequestParam("files") MultipartFile[] files) {
		//判断file数组不能为空并且长度大于0
		if(files!=null&&files.length>0){
			//循环获取file数组中得文件
			for(int i = 0;i<files.length;i++){
				MultipartFile file = files[i];
				//保存文件
				saveFile(file);
			}
		}
		// 重定向
		/*return "filesUpload";*/
	}

	/***
	 * 保存文件
	 * @param file
	 * @return
	 */
	private boolean saveFile(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));
				return true;
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
		return false;
	}

	/***
	 * 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:/list.html";
	}

	/***
	 * 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;
	}
}