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    當柳上原的風吹向天際的時候...

    真正的快樂來源于創造

      BlogJava :: 首頁 :: 聯系 :: 聚合  :: 管理
      368 Posts :: 1 Stories :: 201 Comments :: 0 Trackbacks
    將一個字符串存入數據庫并顯示出來是一項簡單任務,當字符串長度較短(新聞級別)時確實如此.
    然而量變引起質變,當字符串長度增加到一定程度(小說級別)時,原有的對簡短字符串的處理流程就需要做出一些變化了.下文將討論這些變化的細節.

    一.Web系統的基本情況
    以下是某Web系統的基本情況:
    前臺JS框架:jQuery1.7.2 它確實貼心,比Dojo強,write less do more真不是空話
    前后臺信息傳遞方式:全部為Ajax異步處理 拒絕form提交
    控制器:Spring3 MVC 很好 SpringMVC終將動搖Struts1/2的低位
    Mapping:Hibernate3.2(C),SpringDAO(RUD)
    后臺DB:MySql5.2 它確實小巧方便,如果Oracle DB2跑在我的T410上那就開不了別的程序了

    二.長文本向后臺的傳遞
    Web前臺向后臺傳遞數據的方式有get和post兩種,它們之間有一些差別.就本文涉及的場景來說,差別主要在數據量的大小上,GET方式對傳輸的數據有大小限制,通常不能大于2KB;而使用POST方式傳遞的數據量比GET方式大得多,理論上不受限制.因此我采用了POST方式.
    傳遞代碼如下:
        var url='wisdom/add.do';

        $.post(
            url, 
            {title:
    encodeURIComponent($("#title").val()),concept:
    encodeURIComponent(
    $(
    "#concept").val())},
            function(data,textStatus){    
                
    var status=$(data).find("status").text();
                
                
    if(status=="ok"){
                    ...

                }
                
    else{
                    
    var text=$(data).find("text").text();
                    alert(text);
                }
            }
        );
    以上代碼中,concept就是在textarea中的長文本,理論上長度是無限的,但實際應用中會受到數據庫字段的限制.

    三.服務器的設置
    POST提交有長度限制,當超過時將會出錯,可以配置maxPostSize參數來改變大小。
    <Connector port="8080" protocol="HTTP/1.1"  connectionTimeout="20000"  redirectPort="8443" maxPostSize="0"/>
    當設置為零時,就沒有長度限制了.

    四.長文本在DB中的存儲
    首先需要考慮的數據庫的字段,一般的varchar肯定是不夠了;clob/blob容量是夠,但查詢時需要取出來轉化一下,而這樣速度上就受限了;一向比較貼心的MySql提供了一個LONGTEXT類型,它可以容納4294967295byte的文字,而在使用上又如同文本一樣,這成了我的首選,在后來的實際測試中,我發現它存儲80萬個漢字是沒有問題的,100萬也行,這就已經滿足我的需求了,因此更大的測試沒有再進行.
    這個Web系統CRUD處理中,C是通過Hinernate完成的,因此在hbm.xml中進行設置就好了.
    <?xml version="1.0"?>
    <!DOCTYPE hibernate-mapping PUBLIC 
        
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        
    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
    <hibernate-mapping package="com.ibm.heyang.domain">
        
    <class name="Wisdom" table="collections_wisdom">
            
    <id name="id" column="ID" >
                
    <generator class="increment"/>
            
    </id>
            
            
    <property name="title" column="title" not-null="true"/>
            
    <property name="concept" type="text">
                
    <column name="concept" not-null="true" length = "16777216" />
            
    </property>
        
            
    <property name="conceptLength" column="conceptLength" />
            
    <property name="addUserId" column="addUserId" />        
            
    <property name="modifyTime" column="modifyTime"/>        
        
    </class>
    </hibernate-mapping>
    以上粗體部分就是大文本字段的設置細節.
    由于Hibernate是采用PreparedStatement,因此concept不需要進行轉義和其它特殊處理.這給檢索也帶來了不少方便.

    五.長文本的檢索
    由于插入數據庫的文本就是原文,所以檢索就是常規的檢索,無須贅述.

    六.長文本向前臺的傳遞前的包裝
    在這個Web系統中,后臺向前臺傳遞的數據是以XML的型式往回傳的,前臺JS得到后再解析出來.
    但長文本有一個特殊的地方就是內容無限制,比如違反XML規則的字符如<>等,這里就需要把它放在CDATA塊里包起來后再向前傳遞.
    如下:
            StringBuilder sb=new StringBuilder();
            
            sb.append(
    "<title><![CDATA[");
            sb.append(StringUtils.isBlank(title)
    ?"-":title);
            sb.append(
    "]]></title>");
                            
            sb.append(
    "<concept><![CDATA[");
            sb.append(concept);
            sb.append(
    "]]></concept>");
    如果不這樣處理一下,前臺js就可能解析XML出錯.

    七.長文本的顯示

    將長文本顯示給用戶看可以采用textarea顯示和網頁顯示,如果是前者那就沒有特殊處理,直接放進去就行了,文本格式和存儲前會一樣,只是用戶看起來不方便,需要用滾動條拖來拖去;而網頁方式就好多了,用戶舒適度好很多,但要求我們進行一些特殊的處理.

    首先是CSS設置,這是為了保證文本不把DIV撐開,設置如下:
    #concept{
        width
    :900px;
        max-width
    :900px;
        min-width
    :900px;
        display
    :inline-block;
        padding-top
    :10px;
        
        color
    :#7a7a7a;
        font-size
    :14px; 
        font-weight
    :normal;
        
        text-align
    :left;
        
        word-wrap
    : break-word; 
        word-break
    : normal;
        
        -moz-binding
    : url('./wordwrap.xml#wordwrap');/*FF only*/
        word-break
    :break-all;
        white-space
    : moz-pre-wrap;
    }

    其次,需要對文本處理一下,這樣做的目的是把<>轉義,另外把\n轉化成<br>,空格轉化成&nbsp;等,如果不這樣做,文字會亂,閱讀起來很覺不便.
    以下是轉化函數:
    function makeText2Html(originalText){
        
        originalText
    =originalText.replace("<","&lt;");
        originalText
    =originalText.replace(">","&gt;");
        originalText
    =originalText.replace(/\n/g,"<br/>");
        originalText
    =originalText.replace(/\t/g,"&nbsp;&nbsp;&nbsp;&nbsp;");
        originalText
    =originalText.replace(" ","&nbsp;");
        
        
    return originalText;
    }
    以下是把XML中的長文本放到頁面中:
    $("#concept").html(getFormatedText($(data).find("concept").text()));

    如果IE ONly的話,也可以把文本用<pre>標簽包起來,這樣就不用makeText2Html的輔助了.

    以上就是對長文本的存儲和顯示的一些處理,由于作者水平有限,上文只是我的孔見,不當之處還請指出.
    posted on 2013-04-19 16:11 何楊 閱讀(660) 評論(5)  編輯  收藏

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    # re: 某Web系統對長文本的存儲和顯示的處理 2014-09-29 20:42 saa
    ffffffffffffffffff  回復  更多評論
      

    # re: 某Web系統對長文本的存儲和顯示的處理 2015-10-30 13:55 叫姐姐
    就好好好好好好好好好好好好好好好好好好好好好好好好好  回復  更多評論
      

    # re: 某Web系統對長文本的存儲和顯示的處理 2015-10-30 13:55 叫姐姐
    反反復復反復反復反復反復反反復復反復發反反復復  回復  更多評論
      

    # re: 某Web系統對長文本的存儲和顯示的處理 2015-10-30 13:56 叫姐姐
    頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂頂  回復  更多評論
      

    # re: 某Web系統對長文本的存儲和顯示的處理 2015-10-30 13:56 叫姐姐
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