浣滆€咃細Richard_Yi\鏉ユ簮锛歫uejin.cn/post/6844904056230690824鏈珷鍐呭涓昏璁ㄨSpring寮€鍙戣繃绋嬩腑渚濊禆娉ㄥ叆鐨勫嚑涓棶棰樸€傛湁鍏磋叮鐨勮鑰呭彲浠ュ厛鐪嬬湅浠ヤ笅涓夌偣锛欯Autowired,@Resource,@Inject杩欎笁涓敞瑙ｇ殑鍖哄埆浣犲湪浣跨敤@Autowired鐨勬椂鍊欙紝鏈夋病鏈夊嚭鐜拌繃Fieldinjectionisnotrecommended鐨勮鍛婏紵浣犵煡閬撲负浠€涔堝悧锛烻pring渚濊禆娉ㄥ叆鏈夊摢浜涙柟寮忥紵瀹樻柟鎺ㄨ崘鏄粈涔堬紵濡傛灉浠ヤ笂闂浣犻兘鏄庣櫧浜嗭紝閭ｆ垜涓汉瑙夊緱浣犵殑寮€鍙戜綋楠屽簲璇ヤ笉閿欎簡馃憤銆傚鏋滄偍瀵硅繖涓変釜闂鎰熷埌鍥版儜锛屽彲浠ョ户缁槄璇汇€傛帴涓嬫潵鎴戜滑渚濇鍥炵瓟浠ヤ笂闂锛屾€荤粨鐭ヨ瘑鐐广€侤Autowired銆丂Resource銆丂Inject涓変釜娉ㄨВ鐨勫尯鍒玈pring鏀寔浣跨敤@Autowired銆丂Resource銆丂Inject涓変釜娉ㄨВ杩涜渚濊禆娉ㄥ叆銆備笅闈粙缁嶄竴涓嬭繖涓変釜娉ㄨВ鐨勫尯鍒€傛帹鑽愪竴涓猄pringBoot鍩虹鏁欑▼鍜屽疄渚嬶細https://github.com/javastacks...@Autowired@Autowired鎻愪緵浜哠pring妗嗘灦鐨勬敞瑙ｏ紝闇€瑕佸鍏ュ寘org.springframework.beans.factory.annotation.Autowired.涓嬮潰鏄竴涓ず渚嬩唬鐮侊紝浠ヤ究浜庤В閲婏細}}@ServicepublicclassSvcBimplementsSvc{@OverridepublicvoidsayHello(){System.out.println("浣犲ソ锛岃繖鏄湇鍔");}}@ServicepublicclassSvcCimplementsSvc{@OverridepublicvoidsayHello(){System.out.println("浣犲ソ锛岃繖鏄湇鍔");}}娴嬭瘯绫伙細@SpringBootTestpublicclassSimpleTest{@Autowired//@Qualifier("svcA")Svcsvc;@Testvoidrc(){Assertions.assertNotNull(svc);svc.sayHello();}}缁勮椤哄簭锛?.鏍规嵁绫诲瀷鍦ㄤ笂涓嬫枃涓壘鍒板尮閰嶇殑bean锛屾壘鍒扮被鍨嬩负Svc2鐨刡ean銆傚鏋滄湁澶氫釜bean锛屽垯鎸夊悕绉板尮閰嶅鏋滄湁@Qualifier娉ㄨВ锛屽垯鏍规嵁@Qualifier鎸囧畾鐨勫悕绉板尮閰嶏紝鎵惧埌鍚嶇О涓簊vcA鐨刡ean锛屽鏋滄病鏈塨ean锛屽垯鏍规嵁鍙橀噺鍚嶅尮閰嶏紝鎵惧埌bean3鍏跺悕绉颁负svcA锛屽鏋滄病鏈夋壘鍒板尮閰嶉」锛屽皢鎶ラ敊銆傦紙@Autowired(required=false)锛屽鏋滀綘璁剧疆required涓篺alse锛堥粯璁や负true锛夛紝娉ㄥ叆澶辫触鏃朵笉浼氭姏鍑哄紓甯革級@Inject鍦⊿pring鐜涓嬶紝@Inject鍜孈Autowired鏄竴鏍风殑锛屽洜涓哄畠浠殑Dependency娉ㄥ叆鏄娇鐢ˋutowiredAnnotationBeanPostProcessor澶勭悊鐨勩€侤Inject鏄疛SR-330瀹氫箟鐨勮鑼冦€傚鏋滀娇鐢ㄨ繖绉嶆柟娉曪紝涔熷彲浠ュ垏鎹㈠埌Guice銆侴uice鏄疓oogle寮€婧愮殑杞婚噺绾I妗嗘灦銆傚鏋滅‖瑕佸尯鍒嗕袱鑰咃紝棣栧厛@Inject鍖呭惈鍦↗avaEE鍖呬腑锛岄渶瑕佸湪SE鐜涓崟鐙紩鍏ャ€傚彟涓€涓尯鍒槸@Autowired鍙互璁剧疆required=false鑰孈Inject娌℃湁杩欎釜灞炴€с€侤Resource@Resource鏄疛SR-250瀹氫箟鐨勬敞瑙ｃ€係pring鍦–ommonAnnotationBeanPostProcessor涓疄鐜颁簡瀵笿SR-250娉ㄨВ鐨勫鐞嗭紝鍖呮嫭@Resource銆侤Resource鏈変袱涓噸瑕佺殑灞炴€э細name鍜宼ype锛孲pring灏咢Resource娉ㄨВ鐨刵ame灞炴€цВ鏋愪负bean鐨勫悕绉帮紝type灞炴€цВ鏋愪负bean鐨勭被鍨嬨€傜粍瑁呴『搴忥細濡傛灉鍚屾椂鎸囧畾name鍜宼ype锛屽垯浠嶴pring涓婁笅鏂囦腑瀵绘壘鍞竴鍖归厤鐨刡ean杩涜缁勮锛屾壘涓嶅埌鍒欐姏鍑哄紓甯搞€傚鏋滄寚瀹氫簡鍚嶇О锛屽垯浠庝笂涓嬫枃涓煡鎵惧叿鏈夊尮閰嶅悕绉帮紙id锛夌殑bean杩涜缁勮锛屽鏋滄壘涓嶅埌鍒欐姏鍑哄紓甯搞€傚鏋滄寚瀹氫簡绫诲瀷锛屽垯浠庝笂涓嬫枃涓壘鍒板敮涓€涓庤绫诲瀷鍖归厤鐨刡ean浠ヨ繘琛岀粍瑁呫€傚鏋滄病鏈夋壘鍒版垨鎵惧埌澶氫釜bean锛屽皢鎶涘嚭寮傚父銆傚鏋滄棦涓嶆寚瀹歯ame涔熶笉鎸囧畾type锛屽垯榛樿鎸夌収byName杩涜缁勮锛涘鏋滄病鏈夊尮閰嶅埌锛屽垯鎸夌収byTypeh杩涜缁勮銆傝繎鏈熺儹鐐规枃绔犳帹鑽愶細1.1,000+Java闈㈣瘯棰樺強绛旀锛?021鏈€鏂扮増锛?.鍒湪婊″睆鐨刬f/else涓紝璇曡瘯绛栫暐妯″紡锛岀湡鐨勫緢濂藉悆锛侊紒3.鎿嶏紒Java涓瓁x鈮爊ull鐨勬柊璇硶鏄粈涔堬紵4銆丼pringBoot2.5鍙戝竷锛屾繁鑹叉ā寮忓お鐐镐簡锛?.銆奐ava寮€鍙戞墜鍐岋紙宓╁北鐗堬級銆嬫渶鏂板彂甯冿紝璧跺揩涓嬭浇鍚э紒鎰熻涓嶉敊锛屽埆蹇樹簡鐐硅禐+杞彂锛?/p>
