手把手搭建Java共享网盘的方法步骤

//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();
    }
  }
}

//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!!");
  }
}

//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;
}

//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();
    }
  }
}