手把手搭建Java共享网盘的方法步骤

项目介绍

在线共享网盘采用jsp+servlet搭建项目结构实现共享网盘，项目分为管理员，普通用户和付费用户三种角色，根据不同角色控制不同权限，实现不同用户对个人文件文件，所有文件，共享文件的增删改查操作。

项目适用人群

正在做毕设的学生，或者需要项目实战练习的Java学习者

开发环境：

jdk 8
intellij idea
tomcat 8.5.40
mysql 5.7

所用技术：

jsp+servlet
js+ajax
layUi
jdbc直连

项目访问地址

http://localhost:8090

项目结构

项目截图

我的网盘

我的共享

回收站

会员充值

管理员-所有文件

管理员-共享申请

关键代码:

1.初始化工作

//数据库连接初始化
public class DBInfo {
  String url = null;
  String username = null;
  String password = null;
  String driverClass = null;
  
  private static DBInfo db = new DBInfo();

  public static DBInfo getInstance(){
    return db;
  }
  
  private DBInfo() {
    InputStream in = this.getClass().getClassLoader().getResourceAsStream(\"db.properties\");
    Properties pp = new Properties();
    try {
      pp.load(in);
      url = pp.getProperty(\"jdbc.url\");
      username = pp.getProperty(\"jdbc.username\");
      password = pp.getProperty(\"jdbc.password\");
      driverClass = pp.getProperty(\"jdbc.driver\");
      
      Class.forName(driverClass);
    } catch (Exception e) {
      e.printStackTrace();
    }finally{
      try {
        in.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
  }

  public Connection getConnection(){
    Connection conn = null;
    try {
      conn = DriverManager.getConnection(url, username, password);
    } catch (Exception e) {
      e.printStackTrace();
    }
    return conn;
  }
}
//上传资源初始化
public void init() throws ServletException {
  super.init();
  //servlet启动时 ，读取配置文件中关于上传的信息
  InputStream in = this.getClass().getClassLoader().getResourceAsStream(\"ini.properties\");
  Properties pp = new Properties();
  try {
    pp.load(in);
    UPLOAD_ROOT_PATH = pp.getProperty(\"upload.path\");
    String tmpPath = pp.getProperty(\"tmp.path\");
    //配置上传临时目录
    factory = new DiskFileItemFactory(1024*1024*10,new File(tmpPath));
    stu = new ServletFileUpload(factory);
  } catch (Exception e) {
    e.printStackTrace();
  }finally{
    try {
      in.close();
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
}

2.资源上传

//前端JSP代码
<div class=\"modal fade\" id=\"uploadModal\" tabindex=\"-1\" role=\"dialog\" aria-labelledby=\"uploadFile\" aria-hidden=\"true\">
    <form action=\"upload\" method=\"post\" enctype=\"multipart/form-data\">
      <input type=\"hidden\" name=\"from\" value=\"user\">
      <div class=\"modal-dialog\">
        <div class=\"modal-content\">
          <div class=\"modal-header\">
            <button type=\"button\" class=\"close\" data-dismiss=\"modal\" aria-hidden=\"true\">&times;</button>
            <h4 class=\"modal-title\" id=\"uploadFile\">上传文件</h4>
          </div>
          <div class=\"modal-body\">
            <input type=\"file\" name=\"file\" value=\"上传文件\">
          </div>
          <div class=\"modal-footer\">
            <button type=\"button\" class=\"btn btn-default\" data-dismiss=\"modal\">
              关闭
            </button>
            <input type=\"submit\" class=\"btn btn-primary\" value=\"确定上传\"/>
          </div>
        </div>
    </form>
  </div>
//后端入库处理
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws  IOException {
  User user = (User) request.getSession().getAttribute(Const.SESSION_USER);
  String from=\"\";
  try {
    List<FileItem> fileItemLists = stu.parseRequest(request);
    for(FileItem fileItem : fileItemLists){
      if(fileItem.isFormField()){
        from = fileItem.getString();
      }else{
        //上传文件名
        String fileName = fileItem.getName();
        String oldfilename = fileItem.getName();
        int index = fileName.lastIndexOf(\"\\\\\");
        if(index != -1) {
          fileName = fileName.substring(index+1);
        }
        String root = UPLOAD_ROOT_PATH+user.getUsername();
        //获取文件大小
        long size = fileItem.getSize();
        String sizeString = StringUtil.computeSize(size);
        Timestamp upTime = new Timestamp(new Date().getTime());
        File file = new File(root,fileName);

        //解决文件同名
        int cnt = 1;
        while(file.exists()){
          StringBuffer sb = new StringBuffer(fileName);
          sb.insert(sb.lastIndexOf(\".\"), \"(\"+cnt+\")\");
          file = new File(root,sb.toString());
          cnt++;
        }
        //文件路径是否存在
        if(!file.getParentFile().exists()){
          file.getParentFile().mkdirs();
        }
        try {
          fileItem.write(file);
          //上传成功，数据库保存记录
          UserFile userFile = new UserFile();
          userFile.setCreateTime(upTime);
          userFile.setFilename(file.getName());
          userFile.setFilename(file.getName());
          userFile.setFileSize(sizeString);
          userFile.setIsShared(0);
          userFile.setOwnerId(user.getId());
          userFile.setPath(file.getAbsolutePath());
          userFile.setOldfilename(oldfilename);
          userFileDao.save(userFile);
          response.sendRedirect(from+\"?action=mydisk\");
        } catch (Exception e) {
          e.printStackTrace();
          response.getWriter().print(\"上传出错\");
        }
      }
    }
  } catch (FileUploadException e) {
    e.printStackTrace();
    response.setContentType(\"text/html; charset=utf8\");
    response.getWriter().print(\"上传出错!!\");
  }
}

3.检索重复上传的资源

//这里上传在上面上传资源时候，将保存原始资源名字
public List<UserFile> findRetrieveListByOwnerId(int ownerId,int isDelete){
  List<UserFile> fileList = new ArrayList<UserFile>();
  Connection conn = db.getConnection();
  PreparedStatement ps = null;
  ResultSet rs = null;
  UserFile userFile = null;
  String sql=\"select * from file where oldfilename in ( \" +
      \" select a.oldfilename from (select oldfilename,count(id) counts from file GROUP BY oldfilename HAVING counts>1) a\" +
      \" ) and ownerid=? and isDelete=?\";
  ps = conn.prepareStatement(sql);
  ps.setInt(1, ownerId);
  ps.setInt(2, isDelete);
  rs = ps.executeQuery();
  while(rs.next()){
    userFile = new UserFile();
    userFile.setId(rs.getInt(1));
    userFile.setFilename(rs.getString(2));
    userFile.setPath(rs.getString(3));
    userFile.setCreateTime(rs.getTimestamp(4));
    userFile.setIsShared(rs.getInt(5));
    userFile.setOwnerId(rs.getInt(6));
    userFile.setFileSize(rs.getString(7));
    userFile.setCounts(rs.getInt(8));
    userFile.setSharedReason(rs.getString(\"SharedReason\"));
    userFile.setSharedTime(rs.getString(\"SharedTime\"));

    fileList.add(userFile);
  }
  return fileList;
}

4.平台会员充值

//前端jsp代码
<body>
  <div id=\"wrapper\">
    <%@include file=\"common/nav.jsp\" %>
    <div id=\"page-wrapper\">
      <div class=\"\">
    <div class=\"col-md-12\">
      <h1 class=\"margin-bottom-15\">以下是微信付款码，扫码即可支付</h1>
      <div class=\"form-group\">
        <div class=\"col-md-12\">
          <div class=\"control-wrapper\">
            <div class=\"text-center\" id=\"div1\">
              <input type=\"submit\" value=\"扫码付款\" class=\"btn btn-success\">
            </div>
            <div class=\"text-center\" id=\"div2\" style=\"display: none;\">
              <input type=\"submit\" value=\"恭喜您，完成扫码支付！\"class=\"btn btn-warning\">
            </div>
          </div>
          <div class=\"text-center\">
            <font color=\"green\">${msgSuccess }</font>
            <font color=\"red\">${msgFail }</font>
          </div>
        </div>
      </div>
      <form class=\"form-horizontal templatemo-container templatemo-login-form-1 margin-bottom-30\" role=\"form\" action=\"user\" method=\"post\">
        <input type=\"hidden\" name=\"action\" value=\"editSubmit\">
        <div class=\"form-group\">
         <img src=\"static/image/pay.png\" alt=\"平台会员充值码\" style=\"width: 81%; padding-left: 24%;\">
        </div>
       </form>
    </div>
  </div>
    </div>
  </div>
</body>
//js实现,采用定时跳转模拟真实用户支付流程，后续进行改动用户会员状态
var test1 = setTimeout(function(){
  $(\"#div1\").css(\"display\",\"none\");
  $(\"#div2\").css(\"display\",\"block\");
  layer.msg(\'恭喜您，完成扫码支付！\', {time: 4000, icon:6},function () {
    window.location.href=\"user?action=doTopUp\";
  });
  clearTimeout(test1);
},5000);
//后端代码
public void doTopUp(User user) {
  Connection conn = db.getConnection();
  PreparedStatement ps = null;
  ResultSet rs = null;
  try {
    //members=1为会员状态
    ps = conn.prepareStatement(\"update user set members = 1 where id = ?\");
    ps.setInt(1, user.getId());
    ps.execute();
  } catch (SQLException e) {
    e.printStackTrace();
  } finally {
    try {
      if (conn != null)
        conn.close();
      if (ps != null)
        ps.close();
      if (rs != null)
        rs.close();
    } catch (SQLException e) {
      e.printStackTrace();
    }
  }
}