Spring框架实现文件上传功能

package com.emerson.cwms.utils;  import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.util.Date; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.Map.Entry;  import org.springframework.web.multipart.MultipartFile;  /**  * 文件上传工具类  *  * @author Chris Mao(Zibing)  *  */ public class FileUploadingUtil {    /**    * 服务器上的保存路径，在使用到上传功能的Controller中对其进行赋值    */   public static String FILEDIR = null;    /**    * 上传多个文件，返回文件名称和服务器存储路径列表    *    * @param files    * @return    * @throws IOException    */   public static Map<String, String> upload(Map<String, MultipartFile> files) throws IOException {     File file = new File(FILEDIR);     if (!file.exists()) {       file.mkdir();     }      Map<String, String> result = new HashMap<String, String>();     Iterator<Entry<String, MultipartFile>> iter = files.entrySet().iterator();     while (iter.hasNext()) {       MultipartFile aFile = iter.next().getValue();       if (aFile.getSize() != 0 && !"".equals(aFile.getName())) {         result.put(aFile.getOriginalFilename(), uploadFile(aFile));       }     }     return result;   }    /**    * 上传单个文件，并返回其在服务器中的存储路径    *    * @param aFile    * @return    * @throws FileNotFoundException    * @throws IOException    */   private static String uploadFile(MultipartFile aFile) throws IOException {     String filePath = initFilePath(aFile.getOriginalFilename());     try {       write(aFile.getInputStream(), new FileOutputStream(filePath));     } catch (FileNotFoundException e) {       logger.error("上传的文件: " + aFile.getName() + " 不存在！！");       e.printStackTrace();     }     return filePath;   }    /**    * 写入数据    *    * @param in    * @param out    * @throws IOException    */   private static void write(InputStream in, OutputStream out) throws IOException {     try {       byte[] buffer = new byte[1024];       int bytesRead = -1;       while ((bytesRead = in.read(buffer)) != -1) {         out.write(buffer, 0, bytesRead);       }       out.flush();     } finally {       try {         in.close();         out.close();       } catch (IOException ex) {       }     }   }    /**    * 遍历服务器目录，列举出目录中的所有文件（含子目录）    * @return    */   public static Map<String, String> getFileMap() {     logger.info(FileUploadingUtil.FILEDIR);     Map<String, String> map = new HashMap<String, String>();     File[] files = new File(FileUploadingUtil.FILEDIR).listFiles();     if (files != null) {       for (File file : files) {         if (file.isDirectory()) {           File[] files2 = file.listFiles();           if (files2 != null) {             for (File file2 : files2) {               String name = file2.getName();               logger.info(file2.getParentFile().getAbsolutePath());               logger.info(file2.getAbsolutePath());               map.put(file2.getParentFile().getName() + "/" + name,                   name.substring(name.lastIndexOf("_") + 1));             }           }         }       }     }     return map;   }    /**    * 返回文件存储路径，为防止重名文件被覆盖，在文件名称中增加了随机数    * @param name    * @return    */   private static String initFilePath(String name) {     String dir = getFileDir(name) + "";     File file = new File(FILEDIR + dir);     if (!file.exists()) {       file.mkdir();     }     Long num = new Date().getTime();     Double d = Math.random() * num;     return (file.getPath() + "/" + num + d.longValue() + "_" + name).replaceAll(" ", "-");   }    /**    *    * @param name    * @return    */   private static int getFileDir(String name) {     return name.hashCode() & 0xf;   } } 

package com.emerson.cwms.web;  import java.io.IOException; import java.util.Iterator; import java.util.Map; import java.util.Map.Entry;  import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;  import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.multipart.MultipartHttpServletRequest;  import com.emerson.cwms.utils.FileUploadingUtil;  /**  * 文件上传控制器  *  * @author Chris Mao(Zibing)  *  */ @Controller @RequestMapping(value = "/files") public class FileController {      @RequestMapping(value = "/", method = RequestMethod.GET)   public String list(HttpServletRequest request, HttpServletResponse response, Model model) {     iniFileDir(request);          System.out.println(request.getAttribute("files"));     model.addAttribute("files", FileUploadingUtil.getFileMap());     return "files/list";   }      @RequestMapping(value = "/upload", method = RequestMethod.POST)   public String doUpload(HttpServletRequest request) {     iniFileDir(request);          try {       MultipartHttpServletRequest mRequest = (MultipartHttpServletRequest) request;       Map<String, String> uploadedFiles = FileUploadingUtil.upload(mRequest.getFileMap());        Iterator<Entry<String, String>> iter = uploadedFiles.entrySet().iterator();       while (iter.hasNext()) {         Entry<String, String> each = iter.next();         System.out.print("Uploaded File Name = " + each.getKey());         System.out.println(", Saved Path in Server = " + each.getValue());       }     } catch (Exception e) {       e.printStackTrace();     }     return "redirect:/files/";   }    private void iniFileDir(HttpServletRequest request) {     FileUploadingUtil.FILEDIR = request.getSession().getServletContext().getRealPath("/") + "files/";     if (FileUploadingUtil.FILEDIR == null) {       FileUploadingUtil.FILEDIR = request.getSession().getServletContext().getRealPath("/") + "files/";     }   } } 

<dependency>   <groupId>commons-fileupload</groupId>   <artifactId>commons-fileupload</artifactId>   <version>1.3.1</version> </dependency>