文件controller

https://github.com/hawkroc/SpringMVC-Hibernate-ehcache/blob/master/src/main/java/sy/controller/FileController.java

package sy.controller;

import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.List;
import java.util.Map;
import java.util.UUID;

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

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
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.ResponseBody;

import sy.comparator.NameComparator;
import sy.comparator.SizeComparator;
import sy.comparator.TypeComparator;
import sy.util.ConfigUtil;

/**
* 文件控制器
*
* @author 孙宇
*
*/
@Controller
@RequestMapping("/fileController")
public class FileController extends BaseController {

/**
* 浏览器服务器附件
*
* @param response
* @param request
* @param session
* @return
*/
@RequestMapping("/fileManage")
@ResponseBody
public Map<String, Object> fileManage(HttpServletResponse response, HttpServletRequest request, HttpSession session) {
Map<String, Object> m = new HashMap<String, Object>();

// 根目录路径，可以指定绝对路径，比如 /var/www/attached/
String rootPath = session.getServletContext().getRealPath("/") + "attached/";

// 根目录URL，可以指定绝对路径，比如 http://www.yoursite.com/attached/
String rootUrl = request.getContextPath() + "/attached/";

// 图片扩展名
String[] fileTypes = new String[] { "gif", "jpg", "jpeg", "png", "bmp" };

String dirName = request.getParameter("dir");
if (dirName != null) {
if (!Arrays.<String> asList(new String[] { "image", "flash", "media", "file" }).contains(dirName)) {
// out.println("Invalid Directory name.");
// return;
try {
response.getWriter().write("无效的目录名称！");
} catch (IOException e) {
e.printStackTrace();
}
return m;
}
rootPath += dirName + "/";
rootUrl += dirName + "/";
File saveDirFile = new File(rootPath);
if (!saveDirFile.exists()) {
saveDirFile.mkdirs();
}
}

// 根据path参数，设置各路径和URL
String path = request.getParameter("path") != null ? request.getParameter("path") : "";
String currentPath = rootPath + path;
String currentUrl = rootUrl + path;
String currentDirPath = path;
String moveupDirPath = "";
if (!"".equals(path)) {
String str = currentDirPath.substring(0, currentDirPath.length() - 1);
moveupDirPath = str.lastIndexOf("/") >= 0 ? str.substring(0, str.lastIndexOf("/") + 1) : "";
}

// 排序形式，name or size or type
String order = request.getParameter("order") != null ? request.getParameter("order").toLowerCase() : "name";

// 不允许使用..移动到上一级目录
if (path.indexOf("..") >= 0) {
// out.println("Access is not allowed.");
// return;
try {
response.getWriter().write("不允许访问！");
} catch (IOException e) {
e.printStackTrace();
}
return m;
}
// 最后一个字符不是/
if (!"".equals(path) && !path.endsWith("/")) {
// out.println("Parameter is not valid.");
// return;
try {
response.getWriter().write("参数无效！");
} catch (IOException e) {
e.printStackTrace();
}
return m;
}
// 目录不存在或不是目录
File currentPathFile = new File(currentPath);
if (!currentPathFile.isDirectory()) {
// out.println("Directory does not exist.");
// return;
try {
response.getWriter().write("目录不存在！");
} catch (IOException e) {
e.printStackTrace();
}
return m;
}

// 遍历目录取的文件信息
List<Hashtable<String, Object>> fileList = new ArrayList<Hashtable<String, Object>>();
if (currentPathFile.listFiles() != null) {
for (File file : currentPathFile.listFiles()) {
Hashtable<String, Object> hash = new Hashtable<String, Object>();
String fileName = file.getName();
if (file.isDirectory()) {
hash.put("is_dir", true);
hash.put("has_file", (file.listFiles() != null));
hash.put("filesize", 0L);
hash.put("is_photo", false);
hash.put("filetype", "");
} else if (file.isFile()) {
String fileExt = fileName.substring(fileName.lastIndexOf(".") + 1).toLowerCase();
hash.put("is_dir", false);
hash.put("has_file", false);
hash.put("filesize", file.length());
hash.put("is_photo", Arrays.<String> asList(fileTypes).contains(fileExt));
hash.put("filetype", fileExt);
}
hash.put("filename", fileName);
hash.put("datetime", new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(file.lastModified()));
fileList.add(hash);
}
}

if ("size".equals(order)) {
Collections.sort(fileList, new SizeComparator());
} else if ("type".equals(order)) {
Collections.sort(fileList, new TypeComparator());
} else {
Collections.sort(fileList, new NameComparator());
}
m.put("moveup_dir_path", moveupDirPath);
m.put("current_dir_path", currentDirPath);
m.put("current_url", currentUrl);
m.put("total_count", fileList.size());
m.put("file_list", fileList);

return m;
}

/**
*
* @param response
* @param request
* @param session
* @return
*/
@RequestMapping("/upload")
@ResponseBody
public Map<String, Object> upload(HttpServletResponse response, HttpServletRequest request, HttpSession session) {
Map<String, Object> m = new HashMap<String, Object>();
m.put("error", 1);
m.put("message", "上传失败！");
// 文件保存目录路径
String savePath = session.getServletContext().getRealPath("/") + "attached/";

// 文件保存目录URL
String saveUrl = request.getContextPath() + "/attached/";

// 定义允许上传的文件扩展名
HashMap<String, String> extMap = new HashMap<String, String>();
extMap.put("image", ConfigUtil.get("image"));
extMap.put("flash", ConfigUtil.get("flash"));
extMap.put("media", ConfigUtil.get("media"));
extMap.put("file", ConfigUtil.get("file"));

long maxSize = Long.parseLong(ConfigUtil.get("maxFileSize")); // 允许上传最大文件大小(字节)

if (!ServletFileUpload.isMultipartContent(request)) {
m.put("error", 1);
m.put("message", "请选择文件！");
return m;
}

// 检查目录
File uploadDir = new File(savePath);
if (!uploadDir.isDirectory()) {
uploadDir.mkdirs();
}

// 检查目录写权限
if (!uploadDir.canWrite()) {
m.put("error", 1);
m.put("message", "上传目录没有写权限！");
return m;
}

String dirName = request.getParameter("dir");
if (dirName == null) {
dirName = "image";
}
if (!extMap.containsKey(dirName)) {
m.put("error", 1);
m.put("message", "目录名不正确！");
return m;
}

// 创建文件夹
savePath += dirName + "/";
saveUrl += dirName + "/";
File saveDirFile = new File(savePath);
if (!saveDirFile.exists()) {
saveDirFile.mkdirs();
}
SimpleDateFormat yearDf = new SimpleDateFormat("yyyy");
SimpleDateFormat monthDf = new SimpleDateFormat("MM");
SimpleDateFormat dateDf = new SimpleDateFormat("dd");
Date date = new Date();
String ymd = yearDf.format(date) + "/" + monthDf.format(date) + "/" + dateDf.format(date) + "/";
savePath += ymd;
saveUrl += ymd;
File dirFile = new File(savePath);
if (!dirFile.exists()) {
dirFile.mkdirs();
}

if (ServletFileUpload.isMultipartContent(request)) {// 判断表单是否存在enctype="multipart/form-data"
FileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(factory);
upload.setHeaderEncoding("UTF-8");
try {
List<FileItem> items = upload.parseRequest(request);
for (FileItem item : items) {
String fileName = item.getName();
if (!item.isFormField()) {
// 检查文件大小
if (item.getSize() > maxSize) {
m.put("error", 1);
m.put("message", "上传文件大小超过限制！(允许最大[" + maxSize + "]字节，您上传了[" + item.getSize() + "]字节)");
return m;
}
// 检查扩展名
String fileExt = fileName.substring(fileName.lastIndexOf(".") + 1).toLowerCase();
if (!Arrays.<String> asList(extMap.get(dirName).split(",")).contains(fileExt)) {
m.put("error", 1);
m.put("message", "上传文件扩展名是不允许的扩展名。\n只允许" + extMap.get(dirName) + "格式！");
return m;
}

String newFileName = UUID.randomUUID().toString() + "." + fileExt;
try {
File uploadedFile = new File(savePath, newFileName);
item.write(uploadedFile);
} catch (Exception e) {
m.put("error", 1);
m.put("message", "上传文件失败！");
return m;
}

m.put("error", 0);
m.put("url", saveUrl + newFileName);
}
}
} catch (FileUploadException e) {
e.printStackTrace();
}
}

return m;
}

}
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