【正文】 用的是開放模式，但這只是系統(tǒng)開發(fā)一級的開放性，在特定的應(yīng)用中無論是 Client 端還是 Server 端都還需要 特定的軟件支持。 三層的 Browser/Server 體系結(jié)構(gòu)具有許多傳統(tǒng) Client/Server 體系結(jié)構(gòu)不具備的優(yōu)點，而且又緊密的結(jié)合了 Inter/Intra 技術(shù)，是技術(shù)發(fā)展的大勢所趨，它把應(yīng)用系統(tǒng)帶入了一個嶄新的發(fā)展時代。 使用簡單，界面友好 ： Client/Server 用戶的界面是由客戶端軟件所決定的，其使用的方法和界面各不相同，每推廣一個 Client/Server 系統(tǒng)都要求用戶從頭學(xué)起，難以使用。 這種結(jié)構(gòu)不僅 把客戶機從沉重的負擔(dān)和不斷對其提高的性能的要求中解放出來，也把技術(shù)維護人員從繁重的維護升級工作中解脫出來。 第二層 功能層：具有應(yīng)用程序擴展功能的 Web 服務(wù)器 。這種結(jié)構(gòu) 即被稱為 B/S 體系結(jié)構(gòu)。有的 Inter 節(jié)點一方面提供服務(wù)，另一方面也從別的節(jié)點處獲得服務(wù)；甚至在一次對話過程中，雙方的角色也可能互換。采用這種結(jié)構(gòu)能綜合各種計算機協(xié)同工作，各盡其能，實現(xiàn)對計算機系統(tǒng)的規(guī)模優(yōu)化（ Rightsizing） 和規(guī)模縮小化 (Downsizing)。 Customer application program operation can be ASP 外文翻譯 +原文 xinxiasd 8 called as customer puter on the own puter of user, in correspondence with database server, when needs carry out any operation for the data in database, customer program seeks server program voluntarily , and sends request to it, server program is regular as basis intends to make to reply, send to return result, application server operation data load is lighter. ( 2 ) Data store management function relatively transparent. In database application data store management function, is carried out respectively independently by server program and customer application program , is regular as proscenium application can violate , and usually those different( no matter is have known still unknown ) operations data, in server program, do not concentrate realization, for instance visit limits of authority, serial number can be repeated , must have customer talent establishment the rule order. It is these to own , for the last user that works on proscenium program is transparent , they need not be interest in ( can not usually also interfere ) the course of behind, can plete own all work. In the application of customer server configuration proscenium program not is very thin , troublesome matter is delivered to server and work. In the system of C/S take off , database can not bee public really , professionally more petent storehouse, it gets independent special management. ( 3 ) The inferior position of the configuration of C/S is high maintenance cost make investment just big. First, with the configuration of C/S, will select proper database platform to realize the genuine unification of database data, make the data synchronism that spreads in two lands plete deliver by database system go to manage, but the logically two operators of land will directly visit a same database to realize efficiently , have so some problems, if needs establishment the data synchronism of real time , the database server that must establish real time munication connection between two places and maintains two lands is online to run , work management staff will again want to defend and manage for customer end as server defends management , maintenance and plex tech support and the investment of this high needs have very high cost, maintenance task is measured. Secondly, the software of the structure of C/S of tradition need to develop the ASP 外文翻譯 +原文 xinxiasd 9 software of different edition according to the different system of operating system , is very rapid because of the renovation of product, price is working needs high with inefficient already do not meet. In JAVA step platform language appearance after, the configuration of B/S is more vigorous impact C/S , and forms threat and challenge for it. . The advantage of B/S configuration software ( 1 ) The Maintenance of inferior position and upgrading way are simple. Now upgrading and the improvement of software system more and more frequently, the product of the configuration of B/S embodies more convenient property obviously. For one a little a little bit big unit , if systematic administrator needs , between hundreds of 1000 even last puters round trip run , efficiency and workload is to can imagine, but the configuration of B/S software needs management server have been all right , all customer ends are browser only, need not do any maintenance at all. No matter the scale of user has , is what , has how many branch will not increase any workload of maintenance upgrading , is all to operate needs to aim at server to go on。s task is to suggest by Web browser to the certain a Web server on work that service is asked , after verifying for user identity, Web server delivers needed homepage with HTTP agreement to customer end, client puter accept the homepage file that passed , and show it in Web browser on. Second layer function layer: Have the Web server of the application function of program extension. In function layer contain the systematic handling of general affairs logic, locate in Web server end. It39。 It is even in one time dialogue course, mutual role also exchanges probably. As in carry out file transmission , if be called as one side who offers file server, is called as one side who gets file customer, when using get or mget order since another node takes file, can think that what self use and it is client puter , is using put or mput order to another node dispatch file can again think the machine that used self is server. Multilayer customer / server structure Along with the development of enterprise application, recently, have again arisen a kind of new multilayer architecture, it applies customer end to divide into two minutes: Customer application and server apply. Customer application is the part of original customer application , is another and partial to have been transfered to server to apply. New customer application takes the responsibility for user interface and simple regular business logic and new server application resident core , changeable business logic. Therefore its structure has bee new ( Client application + Server application )/Server structure. Following picture shows: This kind of structure has solved traditional Client/Server can expand problem, have reduced