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

注册

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

    

      
      

        

          

            ×
            
上传文件
          
          

            
          
          

            
              关闭
            
            
          
        
    
  
//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 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 findRetrieveListByOwnerId(int ownerId,int isDelete){
  List fileList = new ArrayList();
  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

  

    <%@include file="common/nav.jsp" %>
    

      

    

      
以下是微信付款码，扫码即可支付
      

        

          

            

              
            
            

              
            
          
          

            ${msgSuccess }
            ${msgFail }
          
        
      
      

        
        

         
        
       
    
  
    
  

//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();
    }
  }
}

项目后续

其他ssh，ssm，springboot版本后续迭代更新，持续关注

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