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我的相册管理系统

时间：2016-07-25 07:05:00      阅读：265      评论：0      收藏：0      [点我收藏+]

标签：

功能文件的上传，下载和管理
技术：1.用xml当做数据库存储信息（dom4j，xpath)
2.Java表单的文件上传和下载
3.文件目录的打散 （ Hash目录是一种优化文件存储性能的方法）
技术分享

需要的jar包：
commons-fileupload-1.2.2.jar、commons-io-2.1.jar、dom4j-1.6.1.jar和jaxen-1.1-beta-6.jar

先写index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>

    <title>相册管理系统</title>
  </head>

  <body>
        <h1>我的小相册</h1>
        <a href="jsps/upload.jsp">上传相册</a>
        <a href="servlets/ShowServlet">浏览相册</a>
  </body>
</html>

upload.jsp是下载页面放在jsps目录下

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
  </head>

  <body>
    <h1>相处上传</h1>
    <form action="<%=request.getContextPath()%>/servlets/UploadServlet"
          method="post" enctype="multipart/form-data">
               文件:<input type="file" name="file1"/><br/>
               说明:<input type="text" name="desc" /><br/>
       <input type="submit" value="上传" />
    </form>
  </body>

</html>

photos.xml放在src目录下

<?xml version="1.0" encoding="UTF-8"?>
<photos>
</photos>

在写值对象PhotoModel

package cn.hncu.demain;

public class PhotoModel {
    private String id;
    private String realName;
    private String ext;
    private String dir;
    private String dateTime;
    private String ip;
    private String desc;
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    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 [id=" + id + ", realName=" + realName + ", ext="
                + ext + ", dir=" + dir + ", dateTime=" + dateTime + ", ip="
                + ip + ", desc=" + desc + "]";
    }

}

写工具类两个：
MyUtil（日期格式化，目录打散代码，随机id代码)

package cn.hncu.utils;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.UUID;

public class MyUtils {
    private  MyUtils() {
    }
    private static SimpleDateFormat format=new SimpleDateFormat("yyyy年MM月dd日 hh:mm:ss");
    public static String getCurrentDateTime(){
        return format.format(new Date());
    }
    public static String getUUid(){
        UUID uuid=UUID.randomUUID();
        String id=uuid.toString().replaceAll("-", "");
        return id;
    }
    public static String getDir(String uuid){
        String dir1=Integer.toHexString(uuid.hashCode() & 0xf);
        String dir2=Integer.toHexString((uuid.hashCode() & 0xf0)>>4);
        return dir1+"/"+dir2;
    }
}

Dom4jFactory(dom4j的相关操作，获取document对象，保存操作)

package cn.hncu.utils;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.UnsupportedEncodingException;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

public class Dom4jFactory {
    private static Document dom = null;
    private static String path;
    static {
        try {
            SAXReader sax = new SAXReader();
            // 学习一下服务器下的资源路径加载方式(因为我们的资源已经从MyEclipse中发布到Tomcat服务器中了，所以跟原来纯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("photos.xml")
                    .getPath();
            dom = sax.read(new FileInputStream(path));
        } catch (Exception e) {
            throw new RuntimeException(e.getMessage(), e);
        }
    }
    public static Document getDom(){
        return dom;
    }
    public static boolean save(){
        try {
            OutputFormat format=new OutputFormat();
            format.setEncoding("utf-8");
            XMLWriter w = new XMLWriter( new FileOutputStream(new File(path)),format);
            w.write(dom);
            w.close();
            return true;
        } catch (Exception e) {
            return false;
        }
    }
}

从底层写PhotoDao

package cn.hncu.dao;



import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.dom4j.Document;
import org.dom4j.Element;

import cn.hncu.demain.PhotoModel;
import cn.hncu.utils.Dom4jFactory;


public class PhotoDao {
    //添加
    public boolean add(PhotoModel photo){
        Document dom=Dom4jFactory.getDom();
        Element root=dom.getRootElement();
        Element ePhoto=root.addElement("photo");
        ePhoto.addAttribute("id", photo.getId());
        ePhoto.addAttribute("realName", photo.getRealName());
        ePhoto.addAttribute("dir", photo.getDir());
        ePhoto.addAttribute("ip", photo.getIp());
        ePhoto.addAttribute("dateTime", photo.getDateTime());
        ePhoto.addAttribute("ext", photo.getExt());
        ePhoto.addElement("desc").setText(photo.getDesc());

        boolean boo=Dom4jFactory.save();
        return boo;
    }

    //浏览
    public List<PhotoModel>  getAll(){
        Document dom=Dom4jFactory.getDom();
        List<PhotoModel> list=new ArrayList<PhotoModel>();
        Element root=dom.getRootElement();
        Iterator<Element> it=root.elementIterator();
        while(it.hasNext()){
            PhotoModel photo=new PhotoModel();
            Element e=it.next();
            photo.setId(e.attributeValue("id"));
            photo.setDateTime(e.attributeValue("dateTime"));
            photo.setDir(e.attributeValue("dir"));
            photo.setExt(e.attributeValue("ext"));
            photo.setIp(e.attributeValue("ip"));
            photo.setRealName(e.attributeValue("realName"));
            photo.setDesc(e.elementText("desc"));
            list.add(photo);
        }
        return list;
    }

    public PhotoModel getSingleById(String id) {
        Document dom=Dom4jFactory.getDom();
        List<PhotoModel> list=getAll();
        for(PhotoModel photo:list){
            if(photo.getId().equals(id)){
                return photo;
            }
        }
        return null;
    }
    public boolean del(String id) {
        Document dom=Dom4jFactory.getDom();
        Element e=(Element) dom.selectSingleNode("//photo[@id=‘"+id.trim()+"‘]");
        return e.getParent().remove(e);

    }
}

最后写四个servlet
UploadServlet 上传Servlet代码

package cn.hncu.servlets;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
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 org.apache.commons.io.FileUtils;

import cn.hncu.dao.PhotoDao;
import cn.hncu.demain.PhotoModel;
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");
        PrintWriter out = response.getWriter();
        out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
        out.println("<HTML>");
        out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
        out.println("  <BODY>");

        out.println("不支持get方式上传!");

        out.println("  </BODY>");
        out.println("</HTML>");
        out.flush();
        out.close();
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        response.setContentType("text/html;charset=utf-8");

        PrintWriter out = response.getWriter();

        String path=request.getServletContext().getRealPath("/photos");
        DiskFileItemFactory factory=new DiskFileItemFactory();
        factory.setRepository(new File("g:/a"));
        ServletFileUpload upload = new ServletFileUpload(factory);
        upload.setSizeMax(1024*1024*10);//最大10M
        upload.setHeaderEncoding("utf-8");//用于设置文件名的编码，相当于：request.setCharacterEncoding("utf-8");

         FileItem fi=null;
         try {
            List<FileItem> list=upload.parseRequest(request);
            PhotoModel photo = new PhotoModel();//数据封装---需要7个属性
            boolean boo=false;
            InputStream in = null;

            for(FileItem fi2:list){
                fi=fi2;
                if(fi.isFormField()){
                    String desc=fi.getString("utf-8");
                    photo.setDesc(desc);//desc
                }else{
                    in=fi.getInputStream();
                    String realName=fi.getName();
                    if(realName==null || realName.trim().equals("")){
                        out.print("没有选择文件!");
                        return;
                    }
                    if(realName.indexOf("\\")!=-1){
                        realName=realName.substring(realName.lastIndexOf("\\")+1);
                    }
                    photo.setRealName(realName);//真实文件名
                    String ext=realName.substring(realName.lastIndexOf("."));
                    photo.setExt(ext);//3
                    photo.setDateTime(MyUtils.getCurrentDateTime());//4
                    photo.setId(MyUtils.getUUid());//5
                    photo.setDir(MyUtils.getDir(photo.getId()));//6
                    photo.setIp(request.getRemoteAddr());//7

                }
            }

            //把相片信息存储到数据库
            PhotoDao dao=new PhotoDao();
            boo=dao.add(photo);
            //如果上面的相片信息保存成功，那么才开始接收图片文件，把它保存到服务器硬盘
            if(boo){
                System.out.println(dao);
                path=path+"/"+photo.getDir();
                File dir=new File(path);
                if(!dir.exists()){
                    dir.mkdirs();
                }
                String fileName=path+"/"+photo.getId()+photo.getExt();
                FileUtils.copyInputStreamToFile(in, new File(fileName));
                String strPath = request.getContextPath()+"/servlets/ShowServlet";
                out.print("上传成功!<a href=‘"+strPath+"‘>浏览相册</a>");
            }else{
                out.print("上传失败!");
            }
         } catch (FileUploadException e) {
            throw new RuntimeException("上传失败！", e);
        }finally{
            if(fi!=null){
                fi.delete();
            }
        }
        out.flush();
        out.close();
    }

}

ShowServlet 浏览相册的Servlet端

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.dao.PhotoDao;
import cn.hncu.demain.PhotoModel;

public class ShowServlet extends HttpServlet {

     IOException if an error occurred

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
            doPost(request, response);
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        response.setContentType("text/html;charset=utf-8");
        request.setCharacterEncoding("utf-8");
        PrintWriter out = response.getWriter();
        out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
        out.println("<HTML>");
        out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
        out.println("  <BODY>");

        String table="<table border=‘1‘ width=‘100%‘>"+
                    "<tr><th>文件名</th><th>上传ip</th><th>上传时间</th><th>图片</th><th>说明</th><th>操作</th></tr>"
                    ;
        out.print(table);
        PhotoDao dao=new PhotoDao();
        List<PhotoModel> list=dao.getAll();
        for(PhotoModel p:list){
            out.print("<tr>");
            out.println("<td>"+p.getRealName()+"</td>");
            out.println("<td>"+p.getIp()+"</td>");
            out.println("<td>"+p.getDateTime()+"</td>");
            //输出图片
            String path=request.getContextPath()+"/photos/"+p.getDir()+"/"+p.getId()+p.getExt();
            out.println("<td><a href=‘"+path+"‘><img src=‘"+path+"‘ width=‘200‘ height=‘200‘></img></a></td>");
            String op="<a href=‘"+request.getContextPath()+"/servlets/DelServlet?id="+p.getId()+"‘>删除</a>&nbsp;";
            out.println("<td>"+p.getDesc()+"</td>");
            op+="<a href=‘"+request.getContextPath()+"/servlets/DownServlet?id="+p.getId()+"‘>下载</a>";
            out.println("<td>"+op+"</td>");
            out.print("</tr>");
        }

        out.println("</table>");
        out.println("  </BODY>");
        out.println("</HTML>");
        out.flush();
        out.close();
    }

}

DownServlet 下载的服务器代码

package cn.hncu.servlets;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
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.dao.PhotoDao;
import cn.hncu.demain.PhotoModel;

public class DownServlet extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
         doPost(request, response);
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String id=request.getParameter("id");
        response.setContentType("application/force-download");
        PhotoModel p=new PhotoDao().getSingleById(id);
        if(p!=null){

            String realName=p.getRealName();
            realName=new String(realName.getBytes("iso8859-1"),"utf-8");
            response.setHeader("content-Disposition", "attachment;filename=\""+realName+"\"");
            String relpath=getServletContext().getRealPath("/photos/"+p.getDir()+"/"+p.getId()+p.getExt());
            InputStream in=new FileInputStream(relpath);
            OutputStream out=response.getOutputStream();
            System.out.println(relpath);
            byte buf[]=new byte[1024];
            int len=0;
            while ((len=in.read(buf))!=-1){
                out.write(buf,0,len);
            }
            out.close();
        }else{
            response.setContentType("text/html;charset=utf-8");
            response.getWriter().println("该文件已经被删除!");
        }
    }

}

Delservlet 删除操作的服务器

package cn.hncu.servlets;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
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.dao.PhotoDao;
import cn.hncu.demain.PhotoModel;

public class DelServlet extends HttpServlet {


    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
         doPost(request, response);
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        request.setCharacterEncoding("utf-8");
        response.setContentType("text/html;charset=utf-8");
        PrintWriter out=response.getWriter();
        String id=request.getParameter("id");
        PhotoModel p=new PhotoDao().getSingleById(id);
        if(p!=null){
            if(!p.getIp().equals(request.getRemoteAddr())){
                out.println("你无权进行删除！");
                return;
            }
            //※※※※以下部分课后补敲的!!!!
            //1删除数据库中的信息
            PhotoDao dao=new PhotoDao();
            boolean boo=dao.del(id);
            //2把服务器硬盘中的文件删除
            if(boo){
            String fileName="photos/"+p.getDir()+"/"+p.getId()+p.getExt();
                String pathFileName = getServletContext().getRealPath(fileName);
                File f=new File(pathFileName);
                if(f.exists()){
                    f.delete();
                }
                String strPath = request.getContextPath()+"/servlets/ShowServlet";
                out.println("相片删除成功!<a href=‘"+strPath+"‘>浏览相册</a>");
            }else{
                out.println("相片删除失败!");
            }
        }else{
            response.setContentType("text/html;charset=utf-8");
            response.getWriter().println("该文件不存在!");
        }
    }
}

我的相册管理系统

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原文地址：http://blog.csdn.net/wangjian_an/article/details/52020041
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