{"id":39837,"date":"2023-07-08T21:41:17","date_gmt":"2024-01-11T23:30:43","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%98%a5%e5%a4%a9%e7%9a%84%e7%ac%94%e8%ae%b0\/"},"modified":"2024-04-30T12:38:19","modified_gmt":"2024-04-30T04:38:19","slug":"%e6%98%a5%e5%a4%a9%e7%9a%84%e7%ac%94%e8%ae%b0","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%98%a5%e5%a4%a9%e7%9a%84%e7%ac%94%e8%ae%b0\/","title":{"rendered":"\u6625\u5929\u7684\u7b14\u8bb0"},"content":{"rendered":"

\u5173\u4e8eDI\u3002<\/h1>\n

\u88ab\u79f0\u4e3a\u201c\u4f9d\u8d56\u6ce8\u5165\u201d\u7684\u4e8b\u7269\u3002<\/p>\n

\u4f9d\u5b58\u662f\u6307\u4e00\u79cd\u5173\u7cfb\u6216\u60c5\u51b5\uff0c\u5176\u4e2d\u4e00\u4e2a\u4e8b\u7269\u6216\u4e2a\u4f53\u5bf9\u53e6\u4e00\u4e2a\u4e8b\u7269\u6216\u4e2a\u4f53\u4ea7\u751f\u4f9d\u8d56\u6216\u4f9d\u9760\u7684\u72b6\u6001\u3002<\/h2>\n

\u901a\u8fc7\u4f7f\u7528\u5176\u4ed6\u7c7b\u6765\u5b9e\u73b0\uff08\u6307\u7684\u662f\uff09\u4f9d\u8d56\u6027\u53ef\u4ee5\u964d\u4f4e\uff08\u53d8\u5f97\u677e\u6563\u8026\u5408\uff09\u7684\u7a0b\u5ea6\u3002<\/p>\n

\/\/Bad\u306a\u4f8b<\/span>\r\n\/\/Car\u30af\u30e9\u30b9\u3068EngineA\u30af\u30e9\u30b9\u304c\u871c\u7d50\u5408<\/span>\r\n\r\nimport<\/span> java.util.*<\/span>;<\/span>\r\n\r\nclass<\/span> EngineA<\/span>{<\/span>\r\n    public<\/span> void<\/span> boot<\/span>(){<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"EngineA boot\"<\/span>);<\/span>\r\n    }<\/span>\r\n    public<\/span> void<\/span> stop<\/span>(){<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"EngineA stop\"<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nclass<\/span> EngineB<\/span>{<\/span>\r\n    public<\/span> void<\/span> boot<\/span>(){<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"EngineB boot\"<\/span>);<\/span>\r\n    }<\/span>\r\n    public<\/span> void<\/span> stop<\/span>(){<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"EngineB stop\"<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nclass<\/span> Car<\/span>{<\/span>\r\n    private<\/span> EngineA<\/span> engineA<\/span>;<\/span>\r\n    public<\/span> Car<\/span>(<\/span>EngineA<\/span> engineA<\/span>){<\/span>\r\n        this<\/span>.<\/span>engineA<\/span> =<\/span> engineA<\/span>;<\/span>\r\n    }<\/span>\r\n    public<\/span> void<\/span> engineStart<\/span>(){<\/span>\r\n        this<\/span>.<\/span>engineA<\/span>.<\/span>boot<\/span>();<\/span>\r\n    }<\/span>\r\n    public<\/span> void<\/span> engineStop<\/span>(){<\/span>\r\n        this<\/span>.<\/span>engineA<\/span>.<\/span>stop<\/span>();<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nclass<\/span> Main<\/span> {<\/span>\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> throws<\/span> Exception<\/span> {<\/span>\r\n        \r\n        EngineA<\/span> engineA<\/span> =<\/span> new<\/span> EngineA<\/span>();<\/span>\r\n        Car<\/span> car<\/span> =<\/span> new<\/span> Car<\/span>(<\/span>engineA<\/span>);<\/span>\/\/EngineB\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u5165\u308c\u305f\u3044\u6642\u306f\u3001Car\u30af\u30e9\u30b9\uff06\u5229\u7528\u30af\u30e9\u30b9\u4e21\u65b9\u306e\u4fee\u6b63\u304c\u5fc5\u8981\u306b\u306a\u308b\u3002<\/span>\r\n        car<\/span>.<\/span>engineStart<\/span>();<\/span>\r\n        car<\/span>.<\/span>engineStop<\/span>();<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\/\/Good\u306a\u4f8b<\/span>\r\n\/\/Car\u30af\u30e9\u30b9\u3068EngineA\u30af\u30e9\u30b9\u304c\u758e\u7d50\u5408<\/span>\r\n\/\/\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306b\u3088\u308a\u7d50\u5408\u5ea6\u3092\u4e0b\u3052\u308b\u3002<\/span>\r\n\r\nimport<\/span> java.util.*<\/span>;<\/span>\r\n\r\ninterface<\/span> Engine<\/span>{<\/span>\r\n    public<\/span> void<\/span> boot<\/span>();<\/span>\r\n    public<\/span> void<\/span> stop<\/span>();<\/span>\r\n}<\/span>\r\n\r\nclass<\/span> EngineA<\/span> implements<\/span> Engine<\/span>{<\/span>\r\n    public<\/span> void<\/span> boot<\/span>(){<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"EngineA boot\"<\/span>);<\/span>\r\n    }<\/span>\r\n    public<\/span> void<\/span> stop<\/span>(){<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"EngineA stop\"<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nclass<\/span> EngineB<\/span> implements<\/span> Engine<\/span>{<\/span>\r\n    public<\/span> void<\/span> boot<\/span>(){<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"EngineB boot\"<\/span>);<\/span>\r\n    }<\/span>\r\n    public<\/span> void<\/span> stop<\/span>(){<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"EngineB stop\"<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nclass<\/span> Car<\/span>{<\/span>\r\n    private<\/span> Engine<\/span> engine<\/span>;<\/span>\r\n    public<\/span> Car<\/span>(<\/span>Engine<\/span> engine<\/span>){<\/span>\r\n        this<\/span>.<\/span>engine<\/span> =<\/span> engine<\/span>;<\/span>\r\n    }<\/span>\r\n    public<\/span> void<\/span> engineStart<\/span>(){<\/span>\r\n        this<\/span>.<\/span>engine<\/span>.<\/span>boot<\/span>();<\/span>\r\n    }<\/span>\r\n    public<\/span> void<\/span> engineStop<\/span>(){<\/span>\r\n        this<\/span>.<\/span>engine<\/span>.<\/span>stop<\/span>();<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nclass<\/span> Main<\/span> {<\/span>\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> throws<\/span> Exception<\/span> {<\/span>\r\n        \r\n        Engine<\/span> engine<\/span> =<\/span> new<\/span> EngineA<\/span>();<\/span>\r\n        Car<\/span> car<\/span> =<\/span> new<\/span> Car<\/span>(<\/span>engine<\/span>);<\/span>\/\/EngineB\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306b\u5909\u3048\u308b\u5834\u5408\u306f\u3001\u5229\u7528\u30af\u30e9\u30b9\u3082\u4fee\u6b63\u3060\u3051\u3067\u6e08\u3080\u3002<\/span>\r\n        car<\/span>.<\/span>engineStart<\/span>();<\/span>\r\n        car<\/span>.<\/span>engineStop<\/span>();<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u6ce8\u5165\u662f\u4ec0\u4e48\uff1f<\/h2>\n
\u6307\u7684\u662f\u5c06\u5b9e\u4f8b\u653e\u5165\u63a5\u53e3\u7684\u7c7b\u578b\u4e2d\u3002<\/p>\n
class<\/span> Main<\/span> {<\/span>\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> throws<\/span> Exception<\/span> {<\/span>\r\n        \r\n        Engine<\/span> engineA<\/span> =<\/span> new<\/span> EngineA<\/span>();<\/span>\r\n        Car<\/span> car<\/span> =<\/span> new<\/span> Car<\/span>(<\/span>engineA<\/span>);<\/span>\r\n\r\n        Engine<\/span> engineB<\/span> =<\/span> new<\/span> EngineB<\/span>();<\/span>\r\n        Car<\/span> car<\/span> =<\/span> new<\/span> Car<\/span>(<\/span>engineB<\/span>);<\/span>\r\n\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5982\u679c\u60f3\u8981\u5c06EngineA\u6539\u6210EngineA_Ver2\u7684\u8bdd\uff0c
\n\u5c31\u5fc5\u987b\u4fee\u6539\u4f7f\u7528\u8be5\u7c7b\u7684\u5b9e\u73b0\u3002
\n\u5982\u679c\u6709100\u4e2a\u5b9e\u4f8b\u751f\u6210\u7684\u5730\u65b9\uff0c\u4fee\u6539\u5de5\u4f5c\u4f1a\u53d8\u5f97\u975e\u5e38\u590d\u6742\u3002<\/p>\n
class<\/span> EngineA_ver2<\/span> implements<\/span> Engine<\/span>{<\/span>\r\n    public<\/span> void<\/span> boot<\/span>(){<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"EngineA_ver2 boot\"<\/span>);<\/span>\r\n    }<\/span>\r\n    public<\/span> void<\/span> stop<\/span>(){<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"EngineA_ver2 stop\"<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nclass<\/span> Main<\/span> {<\/span>\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> throws<\/span> Exception<\/span> {<\/span>\r\n        \r\n        \/\/Engine engineA = new EngineA();<\/span>\r\n        Engine<\/span> engineA<\/span> =<\/span> new<\/span> EngineA_ver2<\/span>();<\/span>\r\n        Car<\/span> car<\/span> =<\/span> new<\/span> Car<\/span>(<\/span>engineA<\/span>);<\/span>\r\n\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u8981\u600e\u4e48\u505a\u5462\uff1f
\n\u4f7f\u7528\u5de5\u5382\u3002
\n\u8fd9\u6837\u5f53\u60f3\u8981\u66f4\u6362\u5b9e\u4f8b\u65f6\uff0c
\n\u53ea\u9700\u8981\u66f4\u6539\u5de5\u5382\u5373\u53ef\u3002<\/p>\n
class<\/span> EngineFactory<\/span>{<\/span>\r\n        \r\n    public<\/span> static<\/span> Engine<\/span> CreateEngineA<\/span>(){<\/span>\r\n        \/\/return new EngineA();<\/span>\r\n        new<\/span> EngineA_ver2<\/span>();<\/span>\r\n    }<\/span>\r\n    \r\n    public<\/span> static<\/span> Engine<\/span> CreateEngineB<\/span>(){<\/span>\r\n        return<\/span> new<\/span> EngineB<\/span>();<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nclass<\/span> Main<\/span> {<\/span>\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> throws<\/span> Exception<\/span> {<\/span>\r\n        \r\n        Engine<\/span> engineA<\/span> =<\/span> EngineFactory<\/span>.<\/span>CreateEngineA<\/span>();<\/span>\r\n        Car<\/span> car<\/span> =<\/span> new<\/span> Car<\/span>(<\/span>engineA<\/span>);<\/span>\r\n        car<\/span>.<\/span>engineStop<\/span>();<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5982\u679c\u8981\u5b9e\u73b0\u5355\u4f8b\u6a21\u5f0f\uff0c\u53ef\u4ee5\u6309\u4ee5\u4e0b\u65b9\u6cd5\u8fdb\u884c\u3002
\n\u203b\u53ef\u80fd\u8fd8\u6709\u5176\u4ed6\u5b9e\u73b0\u65b9\u6cd5\uff0c\u4f46\u5728\u6b64\u5904\u4e0d\u4f5c\u8ba8\u8bba\u3002<\/p>\n
final<\/span> class<\/span> EngineFactory<\/span>{<\/span>\r\n    \r\n    private<\/span> static<\/span> final<\/span> Engine<\/span> engineA<\/span> =<\/span> new<\/span> EngineA<\/span>();<\/span>\r\n    private<\/span> static<\/span> final<\/span> Engine<\/span> engineB<\/span> =<\/span> new<\/span> EngineB<\/span>();<\/span>\r\n    \r\n    public<\/span> static<\/span> Engine<\/span> CreateEngineA<\/span>(){<\/span>\r\n        return<\/span> engineA<\/span>;<\/span>\r\n    }<\/span>\r\n    \r\n    public<\/span> static<\/span> Engine<\/span> CreateEngineB<\/span>(){<\/span>\r\n        return<\/span> engineB<\/span>;<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5173\u4e8eSpring\u7684\u4f9d\u8d56\u6ce8\u5165\u3002<\/h1>\n
\u6625\u5929\u5df2\u7ecf\u96c6\u6210\u4e86\u4f9d\u8d56\u6ce8\u5165\uff08DI\uff09\u529f\u80fd\u3002
\n\u5b83\u901a\u8fc7\u4e00\u4e2a\u53eb\u505a”DI\u5bb9\u5668”\u7684\u7ec4\u4ef6\u6765\u5b9e\u73b0\u8fd9\u4e2a\u529f\u80fd\u3002
\n\u8be5DI\u5bb9\u5668\u7ba1\u7406\u7740\u88abDI\u6ce8\u5165\u7684\u7c7b\u7684\u5b9e\u4f8b\uff08\u4e5f\u88ab\u79f0\u4e3aBean\uff09\uff0c
\n\u5e76\u5728\u9700\u8981\u65f6\u5c06\u5176\u6ce8\u5165\u3002<\/p>\n
<DI\u30b3\u30f3\u30c6\u30ca>\r\n---------------------\r\n|                    |\r\n|   <Bean1>          |\r\n|\u3000 -----            |\r\n|   |   |            |\r\n|   -----            |\r\n|                    |\r\n|   <Bean2>  \u3000      |\r\n|\u3000 -----            |\r\n|   |   |            |\r\n|   -----            |\r\n|                    |\r\n---------------------\r\n<\/code><\/pre>\n
\u5e38\u89c1\u7684\u7528\u6cd5<\/h2>\n
\u7531\u4e8eSpring\u63d0\u4f9b\u7684\u6ce8\u89e3\uff08@Controller\uff0c@RestController\uff0c@Service\uff0c@Repository\u7b49\u7b49\uff09\uff0c\u57fa\u672c\u4e0a\u53ef\u4ee5\u6839\u636e\u6bcf\u4e2a\u7c7b\u7684\u7528\u9014\uff08\u4f8b\u5982\u5904\u7406\u4e8b\u52a1\u7684\u7c7b\u5e94\u8be5\u6dfb\u52a0@Repository\u6ce8\u89e3\uff09\u6765\u6807\u8bb0\u5b83\u4eec\u4f5c\u4e3aBean\u7684\u76ee\u6807\uff0c\u5e76\u4e14\u5f53\u9700\u8981\u4f7f\u7528\u65f6\uff0c\u53ef\u4ee5\u6dfb\u52a0@Autowired\u6ce8\u89e3\u8fdb\u884c\u6ce8\u5165\u3002<\/p>\n
package<\/span> com.example.demo.web.controller<\/span>;<\/span>\r\n\r\nimport<\/span> org.springframework.beans.factory.annotation.Autowired<\/span>;<\/span>\r\nimport<\/span> org.springframework.web.bind.annotation.GetMapping<\/span>;<\/span>\r\nimport<\/span> org.springframework.web.bind.annotation.PathVariable<\/span>;<\/span>\r\nimport<\/span> org.springframework.web.bind.annotation.RestController<\/span>;<\/span>\r\n\r\nimport<\/span> com.example.demo.service.impl.HelloService<\/span>;<\/span>\r\n\r\n@RestController<\/span>\r\npublic<\/span> class<\/span> HelloController<\/span> {<\/span>\r\n\t\r\n\t@Autowired<\/span>\r\n\tprivate<\/span> HelloService<\/span> helloService<\/span>;<\/span>\r\n\r\n\t@GetMapping<\/span>(<\/span>\"\/hello\/{id:.+}\"<\/span>)<\/span>\r\n\tpublic<\/span> String<\/span> hello<\/span>(<\/span>@PathVariable<\/span>(<\/span>\"id\"<\/span>)<\/span> int<\/span> userId<\/span>)<\/span> {<\/span>\r\n\t\treturn<\/span> helloService<\/span>.<\/span>findOne<\/span>(<\/span>userId<\/span>);<\/span>\r\n\t}<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
package<\/span> com.example.demo.service.impl<\/span>;<\/span>\r\n\r\npublic<\/span> interface<\/span> HelloService<\/span> {<\/span>\r\n\r\n\tpublic<\/span> String<\/span> findOne<\/span>(<\/span>int<\/span> userId<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
package<\/span> com.example.demo.service<\/span>;<\/span>\r\n\r\nimport<\/span> org.springframework.beans.factory.annotation.Autowired<\/span>;<\/span>\r\nimport<\/span> org.springframework.stereotype.Service<\/span>;<\/span>\r\n\r\nimport<\/span> com.example.demo.persistence.repository.HelloRepository<\/span>;<\/span>\r\nimport<\/span> com.example.demo.service.impl.HelloService<\/span>;<\/span>\r\n\r\n@Service<\/span> \r\npublic<\/span> class<\/span> HelloServiceImpl<\/span> implements<\/span> HelloService<\/span> {<\/span>\r\n\t@Autowired<\/span>\r\n\tprivate<\/span> HelloRepository<\/span> helloRepository<\/span>;<\/span>\r\n\tpublic<\/span> String<\/span> findOne<\/span>(<\/span> int<\/span> id<\/span>)<\/span> {<\/span>\r\n\t\t\r\n\t\t\/\/ \uff11 \u4ef6 \u691c\u7d22 \u5b9f\u884c \u2002\u2002\u2002\u2002 <\/span>\r\n\t\tString<\/span> str<\/span> =<\/span> helloRepository<\/span>.<\/span>findOne<\/span>(<\/span>id<\/span>);<\/span>\r\n\t\t\r\n\t\treturn<\/span> str<\/span>;<\/span>\r\n\t}<\/span> \r\n}<\/span>\r\n<\/code><\/pre>\n
package<\/span> com.example.demo.persistence.repository<\/span>;<\/span>\r\n\r\nimport<\/span> org.springframework.stereotype.Repository<\/span>;<\/span>\r\n\r\n@Repository<\/span> \r\npublic<\/span> class<\/span> HelloRepository<\/span> {<\/span>\r\n\t\r\n\tpublic<\/span> String<\/span> findOne<\/span>(<\/span> int<\/span> id<\/span>)<\/span> {<\/span>\r\n\r\n\t\t\/\/\u672c\u5f53\u306f\u3053\u3053\u3067DB\u304b\u3089\u5024\u53d6\u3063\u3066\u304d\u305f\u308a\u3059\u308b<\/span>\r\n\t\t\r\n\t\tString<\/span>[]<\/span> tbl<\/span> =<\/span> {<\/span>\"yamada\"<\/span>,<\/span>\"yoshida\"<\/span>};<\/span>\r\n\t\t\r\n\t\tString<\/span> str<\/span> =<\/span> tbl<\/span>[<\/span>id<\/span>];<\/span>\r\n\t\t\r\n\t\treturn<\/span> str<\/span>;<\/span>\r\n\t}<\/span> \r\n}<\/span>\r\n<\/code><\/pre>\n
\"image.png\"<\/div>\n
\u60f3\u8981\u72ec\u81ea\uff08\uff1f\uff09\u5b9a\u4e49Bean\u65f6\u3002<\/h2>\n
\u6709\u4e24\u79cd\u65b9\u6cd5\u53ef\u4f9b\u9009\u62e9\uff1a
\n– \u7ec4\u4ef6\u626b\u63cf
\n– \u4f7f\u7528\u65b9\u6cd5\u5b9a\u4e49Bean<\/p>\n
\u7ec4\u4ef6\u626b\u63cf<\/h3>\n
\u2460\u786e\u5b9a\u8981\u8fdb\u884c Bean \u5316\u7684\u8303\u56f4\uff08\u5728\u8fd9\u91cc\u6307\u5b9a\u4e3a demo \u6587\u4ef6\u5939\u4e0b\uff09\u3002<\/p>\n
package<\/span> com.example.demo.config<\/span>;<\/span>\r\n\r\nimport<\/span> org.springframework.context.annotation.ComponentScan<\/span>;<\/span>\r\nimport<\/span> org.springframework.context.annotation.Configuration<\/span>;<\/span>\r\n\r\n@Configuration<\/span>\r\n@ComponentScan<\/span>(<\/span>basePackages<\/span> =<\/span> {<\/span>\"demo\"<\/span>})<\/span>\r\npublic<\/span> class<\/span> AppConfig<\/span> {<\/span>\r\n\r\n}<\/span>\r\n<\/code><\/pre>\n
package<\/span> com.example.demo.service<\/span>;<\/span>\r\n\r\npublic<\/span> interface<\/span> FooService<\/span>{<\/span>\r\n\tString<\/span> method<\/span>();<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u60f3\u5c06\u4e00\u4e2a\u7c7b\u8f6c\u5316\u4e3aBean\uff0c\u53ef\u4ee5\u5728\u8be5\u7c7b\u4e0a\u6807\u6ce8”@Component”\u3002<\/p>\n
package<\/span> com.example.demo.service.impl<\/span>;<\/span>\r\n\r\nimport<\/span> org.springframework.stereotype.Component<\/span>;<\/span>\r\n\r\nimport<\/span> com.example.demo.service.FooService<\/span>;<\/span>\r\n\r\n@Component<\/span>\r\npublic<\/span> class<\/span> FooServiceImpl<\/span> implements<\/span> FooService<\/span> {<\/span>\r\n\t\r\n\t public<\/span> String<\/span> method<\/span>()<\/span> {<\/span>\r\n\t\treturn<\/span> \"hello FooServiceImpl\"<\/span>;<\/span>\r\n\t}<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u6211\u60f3\u8981\u4e00\u4e2a\u5e26\u6709@Autowired\u6ce8\u91ca\u7684Bean\u7684\u8bbe\u7f6e\u3002<\/p>\n
package<\/span> com.example.demo.web.controller<\/span>;<\/span>\r\n\r\nimport<\/span> org.springframework.beans.factory.annotation.Autowired<\/span>;<\/span>\r\nimport<\/span> org.springframework.web.bind.annotation.GetMapping<\/span>;<\/span>\r\nimport<\/span> org.springframework.web.bind.annotation.RestController<\/span>;<\/span>\r\n\r\nimport<\/span> com.example.demo.service.FooService<\/span>;<\/span>\r\n\r\n@RestController<\/span>\r\npublic<\/span> class<\/span> FooController<\/span> {<\/span>\r\n\r\n\t@Autowired<\/span>\r\n\tprivate<\/span> FooService<\/span> fs<\/span>;<\/span>\r\n\r\n\t@GetMapping<\/span>(<\/span>\"\/foodi\"<\/span>)<\/span>\r\n\tpublic<\/span> String<\/span> fooDi<\/span>()<\/span> {<\/span>\r\n\t\treturn<\/span> fs<\/span>.<\/span>method<\/span>();<\/span>\r\n\t}<\/span>\r\n\t\r\n}<\/span>\r\n<\/code><\/pre>\n
\"image.png\"<\/div>\n
\u4f7f\u7528\u65b9\u6cd5\u5b9a\u4e49\u7684Bean\u5b9a\u4e49<\/h3>\n
\u5728`Config`\u7c7b\u4e2d\u5b9a\u4e49\u4e00\u4e2a\u65b9\u6cd5\u6765\u751f\u6210\u60f3\u8981\u5c06\u5176\u4f5c\u4e3aBean\u7684\u7c7b\u7684\u5b9e\u4f8b\uff0c\u5e76\u4e14\u52a0\u4e0a`@Bean`\u6ce8\u89e3\u3002
\n\u8fd9\u6837\u5c31\u76f4\u63a5\u6210\u4e3a\u4e86\u4e00\u4e2aBean\u3002\u65b9\u6cd5\u7684\u540d\u5b57\u53ef\u4ee5\u4efb\u610f\u53d6\u3002<\/p>\n
package<\/span> com.example.demo.config<\/span>;<\/span>\r\n\r\nimport<\/span> org.springframework.context.annotation.Bean<\/span>;<\/span>\r\nimport<\/span> org.springframework.context.annotation.Configuration<\/span>;<\/span>\r\n\r\nimport<\/span> com.example.demo.service.HogeService<\/span>;<\/span>\r\nimport<\/span> com.example.demo.service.impl.HogeServiceImpl<\/span>;<\/span>\r\n\r\n@Configuration<\/span>\r\npublic<\/span> class<\/span> AppConfig2<\/span> {<\/span>\r\n\r\n\t@Bean<\/span>\r\n\tpublic<\/span> HogeService<\/span> getHogeService<\/span>()<\/span> {<\/span>\r\n\t\treturn<\/span> new<\/span> HogeServiceImpl<\/span>();<\/span>\r\n\t}<\/span>\r\n\t\r\n}<\/span>\r\n<\/code><\/pre>\n
package<\/span> com.example.demo.service<\/span>;<\/span>\r\n\r\npublic<\/span> interface<\/span> HogeService<\/span>{<\/span>\r\n\tpublic<\/span> String<\/span> method<\/span>();<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
package<\/span> com.example.demo.service.impl<\/span>;<\/span>\r\n\r\nimport<\/span> com.example.demo.service.HogeService<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> HogeServiceImpl<\/span> implements<\/span> HogeService<\/span> {<\/span>\r\n\t\r\n\tpublic<\/span> HogeServiceImpl<\/span>()<\/span> {<\/span>\r\n\t}<\/span>\r\n\t\r\n\t public<\/span> String<\/span> method<\/span>()<\/span> {<\/span>\r\n\t\treturn<\/span> \"hello HogeServiceImpl\"<\/span>;<\/span>\r\n\t}<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
package<\/span> com.example.demo.web.controller<\/span>;<\/span>\r\n\r\nimport<\/span> org.springframework.beans.factory.annotation.Autowired<\/span>;<\/span>\r\nimport<\/span> org.springframework.web.bind.annotation.GetMapping<\/span>;<\/span>\r\nimport<\/span> org.springframework.web.bind.annotation.RestController<\/span>;<\/span>\r\n\r\nimport<\/span> com.example.demo.service.HogeService<\/span>;<\/span>\r\n\r\n@RestController<\/span>\r\npublic<\/span> class<\/span> HogeController<\/span> {<\/span>\r\n\r\n\tprivate<\/span> HogeService<\/span> hs<\/span>;<\/span>\r\n\r\n\t@Autowired<\/span> \/\/\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306f\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u304c\u5358\u4e00\u306a\u3089\u7701\u7565\u53ef\u80fd<\/span>\r\n\tpublic<\/span> HogeController<\/span>(<\/span>HogeService<\/span> hs<\/span>)<\/span> {<\/span>\r\n\t\tthis<\/span>.<\/span>hs<\/span> =<\/span> hs<\/span>;<\/span>\r\n\t}<\/span>\r\n\t\r\n\t@GetMapping<\/span>(<\/span>\"\/hogedi\"<\/span>)<\/span>\r\n\tpublic<\/span> String<\/span> hogeDi<\/span>()<\/span> {<\/span>\r\n\t\treturn<\/span> hs<\/span>.<\/span>method<\/span>();<\/span>\r\n\t}<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\"image.png\"<\/div>\n
\u6587\u732e\u5f15\u7528<\/h1>\n
“4\u7ae0 DI\uff08\u4f9d\u5b58\u6027\u6ce8\u5165\uff09\u7684\u6982\u5ff5\u662f\u4ec0\u4e48”<\/p>\n
https:\/\/www.slideshare.net\/masatoshitada7\/spring-boot-jjug \u7684\u7b2c\u4e8c\u9875\u5c55\u793a\u4e86Spring\u7684\u6838\u5fc3\u6982\u5ff5\uff0c\u5305\u62ec”DI”\u3001”\u5bb9\u5668”\u548c”Bean”\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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