package com.xx.controller;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;

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

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

import com.nupaApp.model.FileMeta;

@Controller
@RequestMapping("/controller")
public class File1Controller {

 LinkedList<FileMeta> files = new LinkedList<FileMeta>();
 FileMeta fileMeta = null;

 /***************************************************
  * URL: /rest/controller/upload upload(): receives files
  * 
  * @param request
  *   : MultipartHttpServletRequest auto passed
  * @param response
  *   : HttpServletResponse auto passed
  * @return LinkedList<FileMeta> as json format
  * @throws IOException
  * @throws FileUploadException
  ****************************************************/
 @RequestMapping(value = "/upload", method = RequestMethod.POST)
 @ResponseBody
 public String upload(HttpServletRequest request, HttpServletResponse response)
   throws IOException, FileUploadException {

  boolean isMultipart = ServletFileUpload.isMultipartContent(request);// 判斷是否是表單文件類型
  DiskFileItemFactory factory = new DiskFileItemFactory();
  ServletFileUpload sfu = new ServletFileUpload(factory);
  List items = sfu.parseRequest(request);// 從request得到所有上傳域的列表
  for (Iterator iter = items.iterator(); iter.hasNext();) {
   FileItem fileitem = (FileItem) iter.next();
   if (!fileitem.isFormField() && fileitem != null) {// 判讀不是普通表單域即是file
                // 操作fileitem文件步驟，可以獲取大小、路徑

    // 定義圖片輸出路徑
    String imgPath = "e:" + System.currentTimeMillis() + ".jpg";
    // 定義圖片流
    InputStream fin = fileitem.getInputStream();

    // 定義圖片輸出流
    FileOutputStream fout = new FileOutputStream(imgPath);
    // 寫文件
    byte[] b = new byte[1024];
    int length = 0;
    while ((length = fin.read(b)) > 0) {

     fout.write(b, 0, length);
    }

    // 關閉數據流
    fin.close();
    fout.close();
   }

  }

  return "200";
 }

}

<!-- 這個用于上傳文件工具操作 -->
  <dependency>
   <groupId>commons-fileupload</groupId>
   <artifactId>commons-fileupload</artifactId>
   <version>1.3.1</version>
  </dependency>
  <dependency>
   <groupId>commons-io</groupId>
   <artifactId>commons-io</artifactId>
   <version>2.4</version>
  </dependency>

<!-- 配置文件上傳，如果沒有使用文件上傳可以不用配置，當然如果不配，那么配置文件 中也不必引入上傳組件包 -->
 <bean id="multipartResolver "
  class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
  <!-- 默認編碼 -->
  <property name="defaultEncoding" value="utf-8" />
  <!-- 文件大小最大值 -->
  <property name="maxUploadSize" value="10485760000" />
  <!-- 內存中的最大值 -->
  <property name="maxInMemorySize" value="40960" />
 </bean>