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实现的功能是：

用到的技术：

先看下2个页面：

源代码：

web.xml:

   
     
      
        
     
      UploadServlet
         
     
      cn.hncu.servlets.UploadServlet
       
      
        
     
      cloudPhotoServlet
         
     
      cn.hncu.servlets.cloudPhotoServlet
       
      
        
     
      DownServlet
         
     
      cn.hncu.servlets.DownServlet
       
      
        
     
      DelServlet
         
     
      cn.hncu.servlets.DelServlet
       
      
        
     
      UploadServlet
         
     
      /upload
       
      
        
     
      cloudPhotoServlet
         
     
      /cloudPhoto
       
      
        
     
      DownServlet
         
     
      /servlet/DownServlet
       
      
        
     
      DelServlet
         
     
      /servlet/DelServlet
       
          
        
     
      index.jsp
       
    
   

index.jsp:

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>                      
相册上传：
    
   
        
    
                 
      
                       
选择文件：
                       
  
                        
文件说明：
                       
  
                        
  
                  
                  
                       
  
                       
  
                  
             
    
    
   
    
   
        
    
    
   
  

photo.xml:

MyUtils.java:

package cn.hncu.utils;import java.text.SimpleDateFormat;import java.util.Date;import java.util.UUID;public class MyUtils {
       /**     * @return 获取UUID     */    public static String getUUID(){        return UUID.randomUUID().toString().replace("-", "");    }    /**     * @param uuid     * @return 通过uuid，获得打散后的路径     */    public static String getDir(String uuid){        String dir1 = Integer.toHexString( uuid.hashCode() & 0xf );        String dir2 = Integer.toHexString( (uuid.hashCode() & 0xf0)>>4 );        return "/"+dir1+"/"+dir2;    }    //日期时间格式    private static SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日 HH:mm:ss");    /**     * @return 返回的是上传的时候的日期时间     */    public static String getCurrentDateTime(){        return sdf.format(new Date());    }}

Dom4jFactory.java:

package cn.hncu.utils;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.UnsupportedEncodingException;import org.dom4j.Document;import org.dom4j.DocumentException;import org.dom4j.Element;import org.dom4j.Node;import org.dom4j.io.SAXReader;import org.dom4j.io.XMLWriter;public class Dom4jFactory {
       private static Document dom=null;    private static String path;    //静态块！只会运行一次！特点是在类加载的时候就执行    static{        try {            SAXReader sax = new SAXReader();            //因为我们的资源已经从myelipse中发布到tomcat服务器中了，所以跟原来的纯Java项目不一样了。            //利用当前类找到它的类加载器，然后通过该类加载器再去获得资源路径            path = Dom4jFactory.class.getClassLoader().getResource("photo.xml").getPath();            //getClassLoader()返回：加载此对象所表示的类或接口的类加载器            //public URL getResource(String name)返回：读取资源的 URL 对象；如果找不到该资源，或者调用者没有足够的权限获取该资源，则返回 null。            //此方法首先搜索资源的父类加载器；如果父类加载器为 null，则搜索的路径就是虚拟机的内置类加载器的路径。            //public String getPath()获取此 URL 的路径部分。             System.out.println(path);            dom = sax.read(new FileInputStream(path));        } catch (FileNotFoundException e) {            throw new RuntimeException(e);        } catch (DocumentException e) {            throw new RuntimeException(e);        }    }    /**     * @return 获取相册的Document     */    public static Document getDocument(){        return dom;    }    /**     * 进行photo.xml的保存，保存到本地     */    public static boolean save(){        try {            XMLWriter w = new XMLWriter(new FileOutputStream(path));            w.write(dom);            w.close();            return true;        } catch (UnsupportedEncodingException e) {            return false;        } catch (FileNotFoundException e) {            return false;        } catch (IOException e) {            return false;        }    }    public static boolean del(String uuid){        Node node = dom.selectSingleNode("[@uuid='"+uuid+"']");        if(node==null){            return false;        }        node.getParent().remove(node);        return true;    }    /**     * 测试用     * @param args     */    public static void main(String[] args){        System.out.println( getDocument() );    }}

PhotoModel.java-值对象

package cn.hncu.domain;/** * 值对象封装 * @author 陈浩翔 * 2016-7-24 */public class PhotoModel {
       private String uuid;//uuid    private String realName="";//图片真实文件名(上传时的文件名)    private String ext;//后缀名    private String dir;//打散后的路径    private String dateTime;//上传文件的时间    private String ip;//上传者的IP    private String desc;//文件的说明    public String getUuid() {        return uuid;    }    public void setUuid(String uuid) {        this.uuid = uuid;    }    public String getRealName() {        return realName;    }    public void setRealName(String realName) {        this.realName = realName;    }    public String getExt() {        return ext;    }    public void setExt(String ext) {        this.ext = ext;    }    public String getDir() {        return dir;    }    public void setDir(String dir) {        this.dir = dir;    }    public String getDateTime() {        return dateTime;    }    public void setDateTime(String dateTime) {        this.dateTime = dateTime;    }    public String getIp() {        return ip;    }    public void setIp(String ip) {        this.ip = ip;    }    public String getDesc() {        return desc;    }    public void setDesc(String desc) {        this.desc = desc;    }    @Override    public String toString() {        return "PhotoModel [uuid=" + uuid + ", realName=" + realName + ", ext="                + ext + ", dir=" + dir + ", dateTime=" + dateTime + ", ip="                + ip + ", desc=" + desc + "]";    }}

PhotoDao.java:

package cn.hncu.photoDao.Dao;import java.util.List;import cn.hncu.domain.PhotoModel;public interface PhotoDao {
       /**     * @param photo     * @return 数据的保存     */    public boolean save(PhotoModel photo);    /**     * @return 返回所所有的图片信息     */    public List
   
     getAll();    /**     * @param uuid     * @return 通过uuid 查找那个被封装的值对象     */    public PhotoModel getSingleByUuid(String uuid);    /**     * @param uuid     * @return 通过uuid删除photos.xml中该图片的信息     */    public boolean deleteXml(String uuid);    /**     * @param dir     * @return 通过路径删除服务器磁盘中该图片的信息     */    public boolean deleteFile(String pathFileName);}
   

PhotoSerImpl.java:

package cn.hncu.photoDao.impl;import java.io.File;import java.util.ArrayList;import java.util.Iterator;import java.util.List;import org.dom4j.Document;import org.dom4j.Element;import org.dom4j.Node;import cn.hncu.domain.PhotoModel;import cn.hncu.photoDao.Dao.PhotoDao;import cn.hncu.utils.Dom4jFactory;public class PhotoSerImpl implements PhotoDao{    @Override    public boolean save(PhotoModel photo) {        Document dom = Dom4jFactory.getDocument();        Element root = dom.getRootElement();        //添加属性        Element p = root.addElement("photo");        p.addAttribute("uuid", photo.getUuid());        p.addAttribute("realName", photo.getRealName());        p.addAttribute("dateTime", photo.getDateTime());        p.addAttribute("ip", photo.getIp());        p.addAttribute("ext", photo.getExt());        p.addAttribute("dir", photo.getDir());        p.addAttribute("desc", photo.getDesc());        return Dom4jFactory.save();    }    @Override    public List
   
     getAll() {        List
    
      list = new ArrayList
     
      ();        Document dom = Dom4jFactory.getDocument();        Element root = dom.getRootElement();        Iterator
      
        it = root.elementIterator("photo");        //通过DOM4J获得photo元素的迭代器,也可以通过xPath来找到所有的 photo        //List
       
         lists = dom.selectNodes("//photo[@uuid]");        //Iterator
        
          it = lists.iterator(); while(it.hasNext()){ Element e = it.next(); PhotoModel photo = new PhotoModel(); photo.setUuid(e.attributeValue("uuid")); photo.setRealName(e.attributeValue("realName")); photo.setDateTime(e.attributeValue("dateTime")); photo.setExt(e.attributeValue("ext")); photo.setIp(e.attributeValue("ip")); photo.setDir(e.attributeValue("dir")); photo.setDesc(e.attributeValue("desc")); list.add(photo); } return list; } @Override public PhotoModel getSingleByUuid(String uuid) { List
         
           photos=getAll(); for(PhotoModel photo:photos){ if(photo.getUuid().equals(uuid)){ return photo; } } return null; } @Override public boolean deleteXml(String uuid) { Document dom = Dom4jFactory.getDocument(); Element e = (Element) dom.selectSingleNode("//photo[@uuid='"+uuid.trim()+"']"); return e.getParent().remove(e); } @Override public boolean deleteFile(String pathFileName) { try { File file = new File(pathFileName); if(file.exists()){ file.delete(); } return true; } catch (Exception e) { return false; } }}
         
        
       
      
     
    
   

PhotoDaoFactory.java:

package cn.hncu.photoDao.factory;import cn.hncu.photoDao.impl.PhotoSerImpl;/** * 工厂方法 * @author 陈浩翔 * 2016-7-24 */public class PhotoDaoFactory {
       public static PhotoSerImpl getPhotoDao(){        return new PhotoSerImpl();    }}

上传-UploadServlet.java:

package cn.hncu.servlets;import java.io.File;import java.io.IOException;import java.io.PrintWriter;import java.util.List;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;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 cn.hncu.domain.PhotoModel;import cn.hncu.photoDao.Dao.PhotoDao;import cn.hncu.photoDao.factory.PhotoDaoFactory;import cn.hncu.utils.Dom4jFactory;import cn.hncu.utils.MyUtils;public class UploadServlet extends HttpServlet {    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        response.setContentType("text/html;charset=utf-8");        response.getWriter().print("
很抱歉，本页面不支持GET方式访问！！！
");        response.getWriter().print("返回上一页 ");    }    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        response.setContentType("text/html;charset=utf-8");        final PrintWriter out = response.getWriter();        //防黑-非multipart表单提交        //使用上传工具的方式        boolean boo = ServletFileUpload.isMultipartContent(request);        if(!boo){            out.print("
不支持普通表单的提交方式！
");            return;        }        File file = new File("d:/photoCache");        if(!file.exists()){            file.mkdir();        }        DiskFileItemFactory fiFactory = new DiskFileItemFactory(1024*10,file);        ServletFileUpload upload = new ServletFileUpload(fiFactory);        upload.setHeaderEncoding("utf-8");//设置文件名编码        String path = getServletContext().getRealPath("/photos");        FileItem fi = null;        try {            List
   
     list = upload.parseRequest(request);            PhotoModel photo = new PhotoModel();//数据封装---需要7个属性            photo.setRealName("");            int cont=0;            for(FileItem f:list){                if(cont!=0 && cont%2==0 && !photo.getRealName().equals("")){                    photo = new PhotoModel();//重新数据封装                }                fi=f;                if(fi.isFormField()){//普通表单组件                    //得到文件说明                    String desc = fi.getString("utf-8");                    photo.setDesc(desc);//#1                }else{                    //防黑3-如果在file组件中不选择文件                    if(fi.getSize()==0){                        photo.setRealName("");                        cont++;                        continue;                    }                    String fileName = fi.getName();                    fileName = fileName.substring( fileName.lastIndexOf("\\")+1);//真实文件名                    photo.setRealName(fileName);//#2                    String ext = fileName.substring(fileName.lastIndexOf("."));//扩展名                    photo.setExt(ext);//#3                    photo.setDateTime(MyUtils.getCurrentDateTime());//#4                    photo.setIp( request.getRemoteAddr() );//#5                    String uuid = MyUtils.getUUID();                    photo.setUuid(uuid);//#6                    photo.setDir( MyUtils.getDir(uuid) );//#7                    //打散目录                    File dFile = new File(path+photo.getDir());                    if(!dFile.exists()){                        dFile.mkdirs();                    }                    fi.write(new File(path+photo.getDir()+"/"+photo.getUuid()+photo.getExt()));                }                cont++;                if(cont%2==0 && !photo.getRealName().equals("")){                    PhotoDao dao = PhotoDaoFactory.getPhotoDao();                    boo = dao.save(photo);                    //存入磁盘-法二：FileUtils.copyInputStreamToFile(in, new File(fileName2));//※2※ 把图片文件存储到服务器硬盘                    photo = new PhotoModel();//重新数据封装                }            }        } catch (FileUploadException e) {            e.printStackTrace();        } catch (Exception e) {            e.printStackTrace();        }finally{            if(fi!=null){                fi.delete();            }            if(Dom4jFactory.save()){                out.print("
    
上传成功！
");                out.print("
    返回上一页 ");            }else{                out.print("
    
上传失败！
");                out.print("
    返回上一页 ");            }        }    }}
   

显示所有文件-cloudPhotoServlet.java

package cn.hncu.servlets;import java.io.IOException;import java.io.PrintWriter;import java.util.List;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import cn.hncu.domain.PhotoModel;import cn.hncu.photoDao.Dao.PhotoDao;import cn.hncu.photoDao.factory.PhotoDaoFactory;public class cloudPhotoServlet extends HttpServlet {    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        String pwd = (String) request.getParameter("pwd");        if ("chx".equals(pwd)) {            doPost(request, response);        } else {            response.setContentType("text/html;charset=utf-8");            response.getWriter().print("
很抱歉，你没有权限访问！！！
");        }    }    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        response.setContentType("text/html;charset=utf-8");        PrintWriter out = response.getWriter();        out.println("");        out.println("");        out.println("  ");        out.println("  ");        out.println("
   
     photos = dao.getAll();        for (PhotoModel photo : photos) {            String fileName = photo.getRealName();            String time = photo.getDateTime();            // 输出图片            String path = request.getContextPath() + "/photos/"                    + photo.getDir() + "/" + photo.getUuid() + photo.getExt();            // System.out.println(path);            // /myPhoto/photos//7/c/a1237a48a6aa451cb22fa78b15bafcea.jpg            String img = "
    ";            String desc = photo.getDesc();            String delStr = "
    删除";            String downStr = "
    下载";            out.println("
   
   
    ");        out.println("
      ");        out.println("
");        out.println("
");        out.println("
");        out.println("
 ");        out.println("
");        String tdWH = "style='width:200px; height:200px;'";        // 显示所有图片        PhotoDao dao = PhotoDaoFactory.getPhotoDao();        List
      ");            out.println("
");            out.println("
");            out.println("
");            out.println("
");            out.println("
");            out.println("
");        }        out.println("
      ");        out.println("
");        out.println("
    
     
      
文件名
      
上传时间");        out.println("
      
文件
      
文件说明
      
操作
     
     
      
 " + fileName + " 
      
" + time + "
      
" + img + "
      
" + desc + "
      
" + delStr + " " + downStr                    + "
     
     
     
    
   
");        out.println("  ");        out.println("");        out.flush();        out.close();    }}

删除文件-DelServlet.java

package cn.hncu.servlets;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import cn.hncu.domain.PhotoModel;import cn.hncu.photoDao.Dao.PhotoDao;import cn.hncu.photoDao.factory.PhotoDaoFactory;public class DelServlet extends HttpServlet {    //注入    private PhotoDao dao = PhotoDaoFactory.getPhotoDao();    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        doPost(request, response);    }    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        String uuid = request.getParameter("uuid");        String ip = request.getRemoteAddr();        response.setContentType("text/html;charset=utf-8");        PrintWriter out = response.getWriter();        PhotoModel photo = dao.getSingleByUuid(uuid);        if(photo!=null){            if(!photo.getIp().equals(ip)){                out.print("
你没有权限删除这个文件！！！
");                out.print("返回上一页 ");                return ;            }            //1.删除数据库中的信息            boolean boo = dao.deleteXml(uuid);            if(boo){                String fileName = "photos/"+photo.getDir()+"/"+photo.getUuid()+photo.getExt();                String pathFileName = getServletContext().getRealPath(fileName);                if(dao.deleteFile(pathFileName)){                    //重定向到相册页面                    response.sendRedirect("/myPhoto/cloudPhoto?pwd=chx");                }else{                    out.print("
无法从服务器中删除，文件正在被占用！！！
");                    out.print("返回上一页 ");                }            }else{                out.print("
该文件已经不存在！！！
");                out.print("返回上一页 ");            }        }    }}

下载文件-DownServlet.java

package cn.hncu.servlets;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.net.URLEncoder;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import cn.hncu.domain.PhotoModel;import cn.hncu.photoDao.Dao.PhotoDao;import cn.hncu.photoDao.factory.PhotoDaoFactory;public class DownServlet extends HttpServlet {    private PhotoDao dao = PhotoDaoFactory.getPhotoDao();    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        doPost(request, response);    }    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        String uuid = request.getParameter("uuid");        System.out.println(uuid);        PhotoModel photo = dao.getSingleByUuid(uuid);        System.out.println(photo);        if(photo!=null){            //设置响应头--内容接收程序--浏览器看到这个响应头，就会把它认为的下载程序打开            //(如果识别迅雷那么就会自动打开迅雷，如果没有则会打开一个“文件另存为”的对话框)            response.setContentType("application/force-download");            String realName = photo.getRealName();            String agent = request.getHeader("User-Agent");            System.out.println(agent);            if(agent.indexOf("Mozilla")!=-1){//火狐浏览器                response.setHeader("Content-Disposition", "attachment;filename="+ new String(realName.getBytes("GB2312"),"ISO-8859-1"));            }else{                //解决中文乱码问题（只要用下面一句对文件名进行编码就行了）                realName = URLEncoder.encode(realName, "utf-8");//使用指定的编码机制将字符串转换为 application/x-www-form-urlencoded 格式。                response.setHeader("Content-Disposition", "attachment;filename=\""+realName+"\"");                //注意：“cttachment;”不能少，否则浏览器会直接在新窗口中打开            }            String fileName = "photos/" + photo.getDir()+"/"+photo.getUuid()+photo.getExt();            String pathFileName = getServletContext().getRealPath(fileName);            InputStream in = new FileInputStream(pathFileName);            OutputStream out = response.getOutputStream();            byte buf[] = new byte[2048];            int len=0;            while( (len=in.read(buf))!=-1 ){                out.write(buf, 0, len);            }            out.close();            in.close();        }else{            response.setContentType("text/html;charset=utf-8");            response.getWriter().println("
该文件已经被删除了
");        }    }}

演示结果

这个我就不演示啦，图片在前面也有，所有的源码我都给了。有兴趣的可以自己取改进一下咯。

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