JavaWeb之實現檔案上傳與下載元件

擇優軟體發表於2021-04-06
JavaWeb元件

資料夾資料庫處理邏輯

public class DbFolder

{

JSONObject root;

public DbFolder()

{

    this.root = new JSONObject();

    this.root.put("f_id", "");

    this.root.put("f_nameLoc", "根目錄");

    this.root.put("f_pid", "");

    this.root.put("f_pidRoot", "");

}

/**

 * 將JSONArray轉換成map

 * @param folders

 * @return

 */

public Map<String, JSONObject> toDic(JSONArray folders)

{

    Map<String, JSONObject> dt = new HashMap<String, JSONObject>();

    for(int i = 0 , l = folders.size();i<l;++i)

    {

        JSONObject o = folders.getJSONObject(i);

        String id = o.getString("f_id");

        dt.put(id, o);

    }

    return dt;

}

public Map<String, JSONObject> foldersToDic(String pidRoot)

{

    //預設載入根目錄

    String sql = String.format("select f_id,f_nameLoc,f_pid,f_pidRoot from up6_folders where f_pidRoot='%s'", pidRoot);

    SqlExec se = new SqlExec();

    JSONArray folders = se.exec("up6_folders", sql, "f_id,f_nameLoc,f_pid,f_pidRoot","");

    return this.toDic(folders);

}

public ArrayList<JSONObject> sortByPid( Map<String, JSONObject> dt, String idCur, ArrayList<JSONObject> psort) {

    String cur = idCur;

    while (true)

    {

        //key不存在

        if (!dt.containsKey(cur)) break;

        JSONObject d = dt.get(cur);//查父ID

        psort.add(0, d);//將父節點排在前面           

        cur = d.getString("f_pid").trim();//取父級ID

        if (cur.trim() == "0") break;

        if ( StringUtils.isBlank(cur) ) break;

    }

    return psort;

}

public JSONArray build_path_by_id(JSONObject fdCur) {

    String id = fdCur.getString("f_id").trim();//

    String pidRoot = fdCur.getString("f_pidRoot").trim();//

    //根目錄

    ArrayList<JSONObject> psort = new ArrayList<JSONObject>();

    if (StringUtils.isBlank(id))

    {

        psort.add(0, this.root);

        return JSONArray.fromObject(psort);

    }

    //構建目錄對映表(id,folder)

    Map<String, JSONObject> dt = this.foldersToDic(pidRoot);

    //按層級順序排列目錄

    psort = this.sortByPid(dt, id, psort);

    SqlExec se = new SqlExec();

    //是子目錄->新增根目錄

    if (!StringUtils.isBlank(pidRoot))

    {

        JSONObject root = se.read("up6_files"

                , "f_id,f_nameLoc,f_pid,f_pidRoot"

                , new SqlParam[] { new SqlParam("f_id", pidRoot) });

        psort.add(0, root);

    }//是根目錄->新增根目錄

    else if (!StringUtils.isBlank(id) && StringUtils.isBlank(pidRoot))

    {

        JSONObject root = se.read("up6_files"

                , "f_id,f_nameLoc,f_pid,f_pidRoot"

                , new SqlParam[] { new SqlParam("f_id", id) });

        psort.add(0, root);

    }

    psort.add(0, this.root);

    return JSONArray.fromObject(psort);

}

public FileInf read(String id) {

    SqlExec se = new SqlExec();

    String sql = String.format("select f_pid,f_pidRoot,f_pathSvr from up6_files where f_id='%s' union select f_pid,f_pidRoot,f_pathSvr from up6_folders where f_id='%s'", id,id);

    JSONArray data = se.exec("up6_files", sql, "f_pid,f_pidRoot,f_pathSvr","");

    JSONObject o = (JSONObject)data.get(0);

    FileInf file = new FileInf();

    file.id = id;

    file.pid = o.getString("f_pid").trim();

    file.pidRoot = o.getString("f_pidRoot").trim();

    file.pathSvr = o.getString("f_pathSvr").trim();

    return file;

}

public Boolean exist_same_file(String name,String pid)

{

    SqlWhereMerge swm = new SqlWhereMerge();

    swm.equal("f_nameLoc", name.trim());

    swm.equal("f_pid", pid.trim());

    swm.equal("f_deleted", 0);

    String sql = String.format("select f_id from up6_files where %s ", swm.to_sql());

    SqlExec se = new SqlExec();

    JSONArray arr = se.exec("up6_files", sql, "f_id", "");

    return arr.size() > 0;

}

/**

 * 檢查是否存在同名目錄

 * @param name

 * @param pid

 * @return

 */

public Boolean exist_same_folder(String name,String pid)

{

    SqlWhereMerge swm = new SqlWhereMerge();

    swm.equal("f_nameLoc", name.trim());

    swm.equal("f_deleted", 0);

    swm.equal("LTRIM (f_pid)", pid.trim());

    String where = swm.to_sql();

    String sql = String.format("(select f_id from up6_files where %s ) union (select f_id from up6_folders where %s)", where,where);

    SqlExec se = new SqlExec();

    JSONArray fid = se.exec("up6_files", sql, "f_id", "");

    return fid.size() > 0;     

}

public Boolean rename_file_check(String newName,String pid)

{

    SqlExec se = new SqlExec();           

    JSONArray res = se.select("up6_files"

        , "f_id"

        ,new SqlParam[] {

            new SqlParam("f_nameLoc",newName)

            ,new SqlParam("f_pid",pid)

        },"");

    return res.size() > 0;

}

public Boolean rename_folder_check(String newName, String pid)

{

    SqlExec se = new SqlExec();

    JSONArray res = se.select("up6_folders"

        , "f_id"

        , new SqlParam[] {

            new SqlParam("f_nameLoc",newName)

            ,new SqlParam("f_pid",pid)

        },"");

    return res.size() > 0;

}

public void rename_file(String name,String id) {

    SqlExec se = new SqlExec();

    se.update("up6_files"

        , new SqlParam[] { new SqlParam("f_nameLoc", name) }

        , new SqlParam[] { new SqlParam("f_id", id) });

}

public void rename_folder(String name, String id, String pid) {

    SqlExec se = new SqlExec();

    se.update("up6_folders"

        , new SqlParam[] { new SqlParam("f_nameLoc", name) }

        , new SqlParam[] { new SqlParam("f_id", id) });

}

}

1.在webuploader.js大概4880行程式碼左右，在動態生成的input元件的下面（也可以直接搜尋input），增加webkitdirectory屬性。

function FileUploader(fileLoc, mgr)

{

var _this = this;

this.id = fileLoc.id;

this.ui = { msg: null, process: null, percent: null, btn: { del: null, cancel: null,post:null,stop:null }, div: null};

this.isFolder = false; //不是資料夾

this.app = mgr.app;

this.Manager = mgr; //上傳管理器指標

this.event = mgr.event;

this.Config = mgr.Config;

this.fields = jQuery.extend({}, mgr.Config.Fields, fileLoc.fields);//每一個物件自帶一個fields幅本

this.State = this.Config.state.None;

this.uid = this.fields.uid;

this.fileSvr = {

      pid: ""

    , id: ""

    , pidRoot: ""

    , f_fdTask: false

    , f_fdChild: false

    , uid: 0

    , nameLoc: ""

    , nameSvr: ""

    , pathLoc: ""

    , pathSvr: ""

    , pathRel: ""

    , md5: ""

    , lenLoc: "0"

    , sizeLoc: ""

    , FilePos: "0"

    , lenSvr: "0"

    , perSvr: "0%"

    , complete: false

    , deleted: false

};//json obj，伺服器檔案資訊

this.fileSvr = jQuery.extend(this.fileSvr, fileLoc);

2.可以獲取路徑

 this.open_files = function (json)

 {

     for (var i = 0, l = json.files.length; i < l; ++i)

    {

         this.addFileLoc(json.files[i]);

     }

     setTimeout(function () { _this.PostFirst(); },500);

 };

 this.open_folders = function (json)

{

    for (var i = 0, l = json.folders.length; i < l; ++i) {

        this.addFolderLoc(json.folders[i]);

    }

     setTimeout(function () { _this.PostFirst(); }, 500);

 };

 this.paste_files = function (json)

 {

     for (var i = 0, l = json.files.length; i < l; ++i)

     {

         this.addFileLoc(json.files[i]);

     }

 };

​

後端程式碼邏輯大部分是相同的，目前能夠支援MySQL,Oracle,SQL。在使用前需要配置一下資料庫，可以參考我寫的這篇文章：http://blog.ncmem.com/wordpress/2019/08/07/java超大檔案上傳與下載/

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