web寮€鍙戜腑鐨勭嚎绋嬪畨鍏
鍦╳eb寮€鍙戜腑,瑕佸叧娉ㄧ敱浜庡苟鍙戣闂墍瀵艰嚧鐨勫鏌愪竴鍚屼竴涓€肩殑淇敼锛屽惁鍒欎俊鎭細閫犳垚娉勬紡servlet鏄湪澶氱嚎绋嬬幆澧冧笅鐨勩€傚嵆鍙兘鏈夊涓姹傚彂缁欎竴涓猻ervelt瀹炰緥锛屾瘡涓姹傛槸涓€涓嚎绋嬨€?/p>
struts涓嬬殑action涔熺被浼硷紝鍚屾牱鍦ㄥ绾跨▼鐜涓嬨€傚彲浠ュ弬鑰僺truts user guide: http://struts.apache.org/struts-action/userGuide/building_controller.html 涓殑Action Class Design Guidelines涓€鑺? 聽Write code for a multi-threaded environment - Our controller servlet creates only one instance of your Action class, and uses this one instance to service all requests. Thus, you need to write thread-safe Action classes. Follow the same guidelines you would use to write thread-safe Servlets.
璇?涓哄绾跨▼鐜缂栧啓浠ｇ爜銆傛垜浠殑controller servlet鎸囨尌鍒涘缓浣犵殑Action 绫荤殑涓€涓疄渚嬶紝鐢ㄦ瀹炰緥鏉ユ湇鍔℃墍鏈夌殑璇锋眰銆傚洜姝わ紝浣犲繀椤荤紪鍐欑嚎绋嬪畨鍏ㄧ殑Action绫汇€傞伒寰笌鍐欑嚎绋嬪畨鍏ㄧ殑servlet鍚屾牱鐨勬柟閽堛€?/p>
聽
1.浠€涔堟槸绾跨▼瀹夊叏鐨勪唬鐮?/p>
鍦ㄥ绾跨▼鐜涓嬭兘姝ｇ‘鎵ц鐨勪唬鐮佸氨鏄嚎绋嬪畨鍏ㄧ殑銆?/p>
瀹夊叏鐨勬剰鎬濇槸鑳芥纭墽琛岋紝鍚﹀垯鍚庢灉鏄▼搴忔墽琛岄敊璇紝鍙兘鍑虹幇鍚勭寮傚父鎯呭喌銆?/p>
2.濡備綍缂栧啓绾跨▼瀹夊叏鐨勪唬鐮?/p>
寰堝涔︾睄閲岄兘璇︾粏璁茶В浜嗗浣曡繖鏂归潰鐨勯棶棰橈紝浠栦滑涓昏璁茶В鐨勬槸濡備綍鍚屾绾跨▼瀵瑰叡浜祫婧愮殑浣跨敤鐨勯棶棰樸€備富瑕佹槸瀵箂ynchronized鍏抽敭瀛楃殑鍚勭鐢ㄦ硶锛屼互鍙婇攣鐨勬蹇点€?/p>
Java1.5涓篃鎻愪緵浜嗗璇诲啓閿佽繖绫荤殑宸ュ叿绫汇€傝繖浜涢兘闇€瑕佽緝楂樼殑鎶€宸э紝鑰屼笖鐩稿闅句簬璋冭瘯銆?/p>
聽
浣嗘槸锛岀嚎绋嬪悓姝ユ槸涓嶅緱浠ョ殑鏂规硶,鏄瘮杈冨鏉傜殑,鑰屼笖浼氬甫鏉ユ€ц兘鐨勬崯澶便€傜瓑鏁堢殑浠ｇ爜涓紝涓嶉渶瑕佸悓姝ュ湪缂栧啓瀹规槗搴﹀拰鎬ц兘涓婁細鏇村ソ浜涖€?/p>
鎴戣繖閲屽己璋冪殑鏄粈涔堜唬鐮佹槸濮嬬粓涓虹嚎绋嬪畨鍏ㄧ殑銆佹槸涓嶉渶瑕佸悓姝ョ殑銆傚涓?
1)甯搁噺濮嬬粓鏄嚎绋嬪畨鍏ㄧ殑锛屽洜涓哄彧瀛樺湪璇绘搷浣溿€?/p>
2)瀵规瀯閫犲櫒鐨勮闂?new 鎿嶄綔)鏄嚎绋嬪畨鍏ㄧ殑锛屽洜涓烘瘡娆￠兘鏂板缓涓€涓疄渚嬶紝涓嶄細璁块棶鍏变韩鐨勮祫婧愩€?/p>
3)鏈€閲嶈鐨勬槸:灞€閮ㄥ彉閲忔槸绾跨▼瀹夊叏鐨勩€傚洜涓烘瘡鎵ц涓€涓柟娉曪紝閮戒細鍦ㄧ嫭绔嬬殑绌洪棿鍒涘缓灞€閮ㄥ彉閲忥紝瀹冧笉鏄叡浜殑璧勬簮銆傚眬閮ㄥ彉閲忓寘鎷柟娉曠殑鍙傛暟鍙橀噺銆?/p>
struts user guide閲屾湁锛?/p>
Only Use Local Variables - The most important principle that aids in thread-safe coding is to use only local variables, not instance variables , in your Action class.
璇?鍙娇鐢ㄧ敤灞€閮ㄥ彉閲忋€?--缂栧啓绾跨▼瀹夊叏鐨勪唬鐮佹渶閲嶈鐨勫師鍒欏氨鏄紝鍦ˋction绫讳腑鍙娇鐢ㄥ眬閮ㄥ彉閲忥紝涓嶄娇鐢ㄥ疄渚嬪彉閲忋€?/p>
聽
鎬荤粨锛?/p>
鍦↗ava鐨刉eb鏈嶅姟鍣ㄧ幆澧冧笅寮€鍙戯紝瑕佹敞鎰忕嚎绋嬪畨鍏ㄧ殑闂銆傛渶绠€鍗曠殑瀹炵幇鏂瑰紡灏辨槸鍦⊿ervlet鍜孲truts Action閲屼笉瑕佷娇鐢ㄧ被鍙橀噺銆佸疄渚嬪彉閲忥紝浣嗗彲浠ヤ娇鐢ㄧ被甯搁噺鍜屽疄渚嬪父閲忋€?/p>
濡傛灉鏈夎繖浜涘彉閲忥紝鍙互灏嗗畠浠浆鎹负鏂规硶鐨勫弬鏁颁紶鍏ワ紝浠ユ秷闄ゅ畠浠€?/p>
娉ㄦ剰涓€涓鏄撴贩娣嗙殑鍦版柟锛氳Servlet鎴朅ction璋冪敤鐨勭被涓?濡傚€煎璞°€侀鍩熸ā鍨嬬被)涓槸鍚﹀彲浠ュ畨鍏ㄧ殑浣跨敤瀹炰緥鍙橀噺锛熷鏋滀綘鍦ㄦ瘡娆℃柟娉曡皟鐢ㄦ椂
鏂板缓涓€涓璞★紝鍐嶈皟鐢ㄥ畠浠殑鏂规硶锛屽垯涓嶅瓨鍦ㄥ悓姝ラ棶棰?--鍥犱负瀹冧滑涓嶆槸澶氫釜绾跨▼鍏变韩鐨勮祫婧愶紝鍙湁鍏变韩鐨勮祫婧愭墠闇€瑕佸悓姝?--鑰孲ervlet鍜孉ction鐨勫疄渚嬪浜庡涓嚎绋嬫槸鍏变韩鐨勩€?/p>
鎹㈠彞璇濊锛孲ervlet鍜孉ction鐨勫疄渚嬩細琚涓嚎绋嬪悓鏃惰皟鐢紝鑰岃繃浜嗚繖涓€灞?濡傛灉鍦ㄤ綘鑷繁鐨勪唬鐮佷腑娌℃湁鍙﹀鍚姩绾跨▼锛屼笖姣忔璋冪敤鍚庣画涓氬姟瀵硅薄鏃堕兘鏄厛鏂板缓涓€涓疄渚嬪啀璋冪敤锛屽垯閮芥槸绾跨▼瀹夊叏鐨勩€?/p>