{"id":10008186,"date":"2023-08-29T10:01:02","date_gmt":"2023-08-29T02:01:02","guid":{"rendered":"https:\/\/blog.itmax.cn\/?p=10008186"},"modified":"2023-08-29T10:01:02","modified_gmt":"2023-08-29T02:01:02","slug":"spring-boot-%e5%88%ab%e5%86%8d%e7%94%a8-date-%e4%bd%9c%e4%b8%ba%e5%85%a5%e5%8f%82%e4%ba%86%ef%bc%8clocaldatetime%e3%80%81localdate-%e7%9c%9f%e9%a6%99%ef%bc%81","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10008186","title":{"rendered":"Spring Boot \u522b\u518d\u7528 Date \u4f5c\u4e3a\u5165\u53c2\u4e86\uff0cLocalDateTime\u3001LocalDate \u771f\u9999\uff01"},"content":{"rendered":"

\u4f5c\u8005\uff1aTinyThing
\u94fe\u63a5\uff1ahttps:\/\/www.jianshu.com\/p\/b52db905f020<\/a><\/p>\n

0x0 \u80cc\u666f<\/h2>\n
\n

\u9879\u76ee\u4e2d\u4f7f\u7528LocalDateTime\u7cfb\u5217\u4f5c\u4e3adto\u4e2d\u65f6\u95f4\u7684\u7c7b\u578b\uff0c\u4f46\u662fspring\u6536\u5230\u53c2\u6570\u540e\u603b\u62a5\u9519\uff0c\u4e3a\u4e86\u5168\u5c40\u914d\u7f6e\u65f6\u95f4\u7c7b\u578b\u8f6c\u6362\uff0c\u5c1d\u8bd5\u4e86\u5982\u4e0b3\u4e2d\u65b9\u6cd5\u3002<\/p>\n

\u6ce8\uff1a\u672c\u6587\u57fa\u4e8eSpringboot2.0\u6d4b\u8bd5\uff0c\u5982\u679c\u65e0\u6cd5\u751f\u6548\u53ef\u80fd\u662fspring\u7248\u672c\u8f83\u4f4e\u5bfc\u81f4\u7684\u3002PS\uff1a\u5982\u679c\u4f60\u7684Controller\u4e2d\u7684LocalDate\u7c7b\u578b\u7684\u53c2\u6570\u5565\u6ce8\u89e3\uff08RequestParam\u3001PathVariable\u7b49\uff09\u90fd\u6ca1\u52a0\uff0c\u4e5f\u662f\u4f1a\u51fa\u9519\u7684\uff0c\u56e0\u4e3a\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u89e3\u6790\u8fd9\u79cd\u53c2\u6570\u4f7f\u7528ModelAttributeMethodProcessor<\/code>\u8fdb\u884c\u5904\u7406\uff0c\u800c\u8fd9\u4e2a\u5904\u7406\u5668\u8981\u901a\u8fc7\u53cd\u5c04\u5b9e\u4f8b\u5316\u4e00\u4e2a\u5bf9\u8c61\u51fa\u6765\uff0c\u7136\u540e\u518d\u5bf9\u5bf9\u8c61\u4e2d\u7684\u5404\u4e2a\u53c2\u6570\u8fdb\u884cconvert\uff0c\u4f46\u662fLocalDate\u7c7b\u6ca1\u6709\u6784\u9020\u51fd\u6570\uff0c\u65e0\u6cd5\u53cd\u5c04\u5b9e\u4f8b\u5316\u56e0\u6b64\u4f1a\u62a5\u9519\uff01\uff01\uff01<\/strong><\/p>\n<\/blockquote>\n

0x1 \u5f53LocalDateTime\u4f5c\u4e3aRequestParam\u6216\u8005PathVariable\u65f6<\/h2>\n

\u8fd9\u79cd\u60c5\u51b5\u8981\u548c\u65f6\u95f4\u4f5c\u4e3aJson\u5b57\u7b26\u4e32\u65f6\u533a\u522b\u5bf9\u5f85\uff0c\u56e0\u4e3a\u524d\u7aefjson\u8f6c\u540e\u7aefpojo\u5e95\u5c42\u4f7f\u7528\u7684\u662fJson\u5e8f\u5217\u5316Jackson\u5de5\u5177\uff08HttpMessgeConverter\uff09\uff1b\u800c\u65f6\u95f4\u5b57\u7b26\u4e32\u4f5c\u4e3a\u666e\u901a\u8bf7\u6c42\u53c2\u6570\u4f20\u5165\u65f6\uff0c\u8f6c\u6362\u7528\u7684\u662fConverter\uff0c\u4e24\u8005\u6709\u533a\u522b\u54e6\u3002
\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6709\u5982\u4e0b\u51e0\u79cd\u65b9\u6848\uff1a<\/p><\/blockquote>\n

\u63a8\u8350\u4e00\u4e2a\u5f00\u6e90\u514d\u8d39\u7684 Spring Boot \u5b9e\u6218\u9879\u76ee\uff1a<\/p>\n

https:\/\/github.com\/javastacks\/spring-boot-best-practice<\/a><\/p><\/blockquote>\n

1. \u4f7f\u7528Converter<\/h3>\n
import org.springframework.context.annotation.Bean;\nimport org.springframework.context.annotation.Configuration;\nimport org.springframework.core.convert.converter.Converter;\nimport org.springframework.http.converter.HttpMessageConverter;\n\nimport java.time.LocalDate;\nimport java.time.LocalDateTime;\nimport java.time.format.DateTimeFormatter;\n\n@Configuration\npublic class DateConfig {\n\n    @Bean\n    public Converter<String, LocalDate> localDateConverter() {\n        return new Converter<>() {\n            @Override\n            public LocalDate convert(String source) {\n                return LocalDate.parse(source, DateTimeFormatter.ofPattern("yyyy-MM-dd"));\n            }\n        };\n    }\n\n    @Bean\n    public Converter<String, LocalDateTime> localDateTimeConverter() {\n        return new Converter<>() {\n            @Override\n            public LocalDateTime convert(String source) {\n                return LocalDateTime.parse(source, DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));\n            }\n        };\n    }\n\n}<\/code><\/pre>\n
\u4ee5\u4e0a\u4e24\u4e2abean\u4f1a\u6ce8\u5165\u5230spring mvc\u7684\u53c2\u6570\u89e3\u6790\u5668\uff08\u597d\u50cf\u53eb\u505aParameterConversionService\uff09\uff0c\u5f53\u4f20\u5165\u7684\u5b57\u7b26\u4e32\u8981\u8f6c\u4e3aLocalDateTime\u7c7b\u65f6\uff0cspring\u4f1a\u8c03\u7528\u8be5Converter\u5bf9\u8fd9\u4e2a\u5165\u53c2\u8fdb\u884c\u8f6c\u6362\u3002<\/p><\/blockquote>\n
2. \u4f7f\u7528ControllerAdvice\u914d\u5408initBinder<\/h3>\n
@ControllerAdvice\npublic class GlobalExceptionHandler {\n\n    @InitBinder\n    protected void initBinder(WebDataBinder binder) {\n        binder.registerCustomEditor(LocalDate.class, new PropertyEditorSupport() {\n            @Override\n            public void setAsText(String text) throws IllegalArgumentException {\n                setValue(LocalDate.parse(text, DateTimeFormatter.ofPattern("yyyy-MM-dd")));\n            }\n        });\n        binder.registerCustomEditor(LocalDateTime.class, new PropertyEditorSupport() {\n            @Override\n            public void setAsText(String text) throws IllegalArgumentException {\n                setValue(LocalDateTime.parse(text, DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));\n            }\n        });\n        binder.registerCustomEditor(LocalTime.class, new PropertyEditorSupport() {\n            @Override\n            public void setAsText(String text) throws IllegalArgumentException {\n                setValue(LocalTime.parse(text, DateTimeFormatter.ofPattern("HH:mm:ss")));\n            }\n        });\n    }\n}<\/code><\/pre>\n
\u4ece\u540d\u5b57\u5c31\u53ef\u4ee5\u770b\u51fa\u6765\uff0c\u8fd9\u662f\u5728controller\u505a\u73af\u5207\uff08\u8fd9\u91cc\u9762\u8fd8\u53ef\u4ee5\u5168\u5c40\u5f02\u5e38\u6355\u83b7\uff09\uff0c\u5728\u53c2\u6570\u8fdb\u5165handler\u4e4b\u524d\u8fdb\u884c\u8f6c\u6362\uff1b\u8f6c\u6362\u4e3a\u6211\u4eec\u76f8\u5e94\u7684\u5bf9\u8c61\u3002<\/p><\/blockquote>\n
0x2 \u5f53LocalDateTime\u4f5c\u4e3aJson\u5f62\u5f0f\u4f20\u5165<\/h2>\n
\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5982\u540c\u4e0a\u6587\u63cf\u8ff0\uff0c\u8981\u5229\u7528Jackson\u7684json\u5e8f\u5217\u5316\u548c\u53cd\u5e8f\u5217\u5316\u6765\u505a\uff1a<\/p><\/blockquote>\n
@Configuration\npublic class JacksonConfig {\n\n    \/** \u9ed8\u8ba4\u65e5\u671f\u65f6\u95f4\u683c\u5f0f *\/\n    public static final String DEFAULT_DATE_TIME_FORMAT = "yyyy-MM-dd HH:mm:ss";\n    \/** \u9ed8\u8ba4\u65e5\u671f\u683c\u5f0f *\/\n    public static final String DEFAULT_DATE_FORMAT = "yyyy-MM-dd";\n    \/** \u9ed8\u8ba4\u65f6\u95f4\u683c\u5f0f *\/\n    public static final String DEFAULT_TIME_FORMAT = "HH:mm:ss";\n\n\n    @Bean\n    public ObjectMapper objectMapper(){\n        ObjectMapper objectMapper = new ObjectMapper();\n\/\/            objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);\n\/\/            objectMapper.disable(DeserializationFeature.ADJUST_DATES_TO_CONTEXT_TIME_ZONE);\n        JavaTimeModule javaTimeModule = new JavaTimeModule();\n        javaTimeModule.addSerializer(LocalDateTime.class,new LocalDateTimeSerializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_TIME_FORMAT)));\n        javaTimeModule.addSerializer(LocalDate.class,new LocalDateSerializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_FORMAT)));\n        javaTimeModule.addSerializer(LocalTime.class,new LocalTimeSerializer(DateTimeFormatter.ofPattern(DEFAULT_TIME_FORMAT)));\n        javaTimeModule.addDeserializer(LocalDateTime.class,new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_TIME_FORMAT)));\n        javaTimeModule.addDeserializer(LocalDate.class,new LocalDateDeserializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_FORMAT)));\n        javaTimeModule.addDeserializer(LocalTime.class,new LocalTimeDeserializer(DateTimeFormatter.ofPattern(DEFAULT_TIME_FORMAT)));\n        objectMapper.registerModule(javaTimeModule).registerModule(new ParameterNamesModule());\n        return objectMapper;\n    }\n\n}<\/code><\/pre>\n
0x3 \u6765\u4e2a\u5b8c\u6574\u7684\u914d\u7f6e\u5427<\/h2>\n
Spring Boot \u57fa\u7840\u5c31\u4e0d\u4ecb\u7ecd\u4e86\uff0c\u63a8\u8350\u770b\u8fd9\u4e2a\u5b9e\u6218\u9879\u76ee\uff1a<\/p>\n
https:\/\/github.com\/javastacks\/spring-boot-best-practice<\/a><\/p><\/blockquote>\n
package com.fly.hi.common.config;\n\nimport com.fasterxml.jackson.core.JsonGenerator;\nimport com.fasterxml.jackson.core.JsonParser;\nimport com.fasterxml.jackson.core.JsonProcessingException;\nimport com.fasterxml.jackson.databind.*;\nimport com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;\nimport com.fasterxml.jackson.datatype.jsr310.deser.LocalDateDeserializer;\nimport com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer;\nimport com.fasterxml.jackson.datatype.jsr310.deser.LocalTimeDeserializer;\nimport com.fasterxml.jackson.datatype.jsr310.ser.LocalDateSerializer;\nimport com.fasterxml.jackson.datatype.jsr310.ser.LocalDateTimeSerializer;\nimport com.fasterxml.jackson.datatype.jsr310.ser.LocalTimeSerializer;\nimport org.springframework.context.annotation.Bean;\nimport org.springframework.context.annotation.Configuration;\nimport org.springframework.core.convert.converter.Converter;\n\nimport java.io.IOException;\nimport java.text.ParseException;\nimport java.text.SimpleDateFormat;\nimport java.time.LocalDate;\nimport java.time.LocalDateTime;\nimport java.time.LocalTime;\nimport java.time.format.DateTimeFormatter;\nimport java.util.Date;\n\n@Configuration\npublic class DateConfig {\n\n    \/** \u9ed8\u8ba4\u65e5\u671f\u65f6\u95f4\u683c\u5f0f *\/\n    public static final String DEFAULT_DATE_TIME_FORMAT = "yyyy-MM-dd HH:mm:ss";\n    \/** \u9ed8\u8ba4\u65e5\u671f\u683c\u5f0f *\/\n    public static final String DEFAULT_DATE_FORMAT = "yyyy-MM-dd";\n    \/** \u9ed8\u8ba4\u65f6\u95f4\u683c\u5f0f *\/\n    public static final String DEFAULT_TIME_FORMAT = "HH:mm:ss";\n\n    \/**\n     * LocalDate\u8f6c\u6362\u5668\uff0c\u7528\u4e8e\u8f6c\u6362RequestParam\u548cPathVariable\u53c2\u6570\n     *\/\n    @Bean\n    public Converter<String, LocalDate> localDateConverter() {\n        return new Converter<>() {\n            @Override\n            public LocalDate convert(String source) {\n                return LocalDate.parse(source, DateTimeFormatter.ofPattern(DEFAULT_DATE_FORMAT));\n            }\n        };\n    }\n\n    \/**\n     * LocalDateTime\u8f6c\u6362\u5668\uff0c\u7528\u4e8e\u8f6c\u6362RequestParam\u548cPathVariable\u53c2\u6570\n     *\/\n    @Bean\n    public Converter<String, LocalDateTime> localDateTimeConverter() {\n        return new Converter<>() {\n            @Override\n            public LocalDateTime convert(String source) {\n                return LocalDateTime.parse(source, DateTimeFormatter.ofPattern(DEFAULT_DATE_TIME_FORMAT));\n            }\n        };\n    }\n\n    \/**\n     * LocalTime\u8f6c\u6362\u5668\uff0c\u7528\u4e8e\u8f6c\u6362RequestParam\u548cPathVariable\u53c2\u6570\n     *\/\n    @Bean\n    public Converter<String, LocalTime> localTimeConverter() {\n        return new Converter<>() {\n            @Override\n            public LocalTime convert(String source) {\n                return LocalTime.parse(source, DateTimeFormatter.ofPattern(DEFAULT_TIME_FORMAT));\n            }\n        };\n    }\n\n    \/**\n     * Date\u8f6c\u6362\u5668\uff0c\u7528\u4e8e\u8f6c\u6362RequestParam\u548cPathVariable\u53c2\u6570\n     *\/\n    @Bean\n    public Converter<String, Date> dateConverter() {\n        return new Converter<>() {\n            @Override\n            public Date convert(String source) {\n                SimpleDateFormat format = new SimpleDateFormat(DEFAULT_DATE_TIME_FORMAT);\n                try {\n                    return format.parse(source);\n                } catch (ParseException e) {\n                    throw new RuntimeException(e);\n                }\n            }\n        };\n    }\n\n\n    \/**\n     * Json\u5e8f\u5217\u5316\u548c\u53cd\u5e8f\u5217\u5316\u8f6c\u6362\u5668\uff0c\u7528\u4e8e\u8f6c\u6362Post\u8bf7\u6c42\u4f53\u4e2d\u7684json\u4ee5\u53ca\u5c06\u6211\u4eec\u7684\u5bf9\u8c61\u5e8f\u5217\u5316\u4e3a\u8fd4\u56de\u54cd\u5e94\u7684json\n     *\/\n    @Bean\n    public ObjectMapper objectMapper(){\n        ObjectMapper objectMapper = new ObjectMapper();\n        objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);\n        objectMapper.disable(DeserializationFeature.ADJUST_DATES_TO_CONTEXT_TIME_ZONE);\n\n        \/\/LocalDateTime\u7cfb\u5217\u5e8f\u5217\u5316\u548c\u53cd\u5e8f\u5217\u5316\u6a21\u5757\uff0c\u7ee7\u627f\u81eajsr310\uff0c\u6211\u4eec\u5728\u8fd9\u91cc\u4fee\u6539\u4e86\u65e5\u671f\u683c\u5f0f\n        JavaTimeModule javaTimeModule = new JavaTimeModule();\n        javaTimeModule.addSerializer(LocalDateTime.class,new LocalDateTimeSerializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_TIME_FORMAT)));\n        javaTimeModule.addSerializer(LocalDate.class,new LocalDateSerializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_FORMAT)));\n        javaTimeModule.addSerializer(LocalTime.class,new LocalTimeSerializer(DateTimeFormatter.ofPattern(DEFAULT_TIME_FORMAT)));\n        javaTimeModule.addDeserializer(LocalDateTime.class,new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_TIME_FORMAT)));\n        javaTimeModule.addDeserializer(LocalDate.class,new LocalDateDeserializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_FORMAT)));\n        javaTimeModule.addDeserializer(LocalTime.class,new LocalTimeDeserializer(DateTimeFormatter.ofPattern(DEFAULT_TIME_FORMAT)));\n\n\n        \/\/Date\u5e8f\u5217\u5316\u548c\u53cd\u5e8f\u5217\u5316\n        javaTimeModule.addSerializer(Date.class, new JsonSerializer<>() {\n            @Override\n            public void serialize(Date date, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException {\n                SimpleDateFormat formatter = new SimpleDateFormat(DEFAULT_DATE_TIME_FORMAT);\n                String formattedDate = formatter.format(date);\n                jsonGenerator.writeString(formattedDate);\n            }\n        });\n        javaTimeModule.addDeserializer(Date.class, new JsonDeserializer<>() {\n            @Override\n            public Date deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException, JsonProcessingException {\n                SimpleDateFormat format = new SimpleDateFormat(DEFAULT_DATE_TIME_FORMAT);\n                String date = jsonParser.getText();\n                try {\n                    return format.parse(date);\n                } catch (ParseException e) {\n                    throw new RuntimeException(e);\n                }\n            }\n        });\n\n        objectMapper.registerModule(javaTimeModule);\n        return objectMapper;\n    }\n\n\n}<\/code><\/pre>\n
0x4 \u6df1\u5165\u7814\u7a76SpringMVC\u6570\u636e\u7ed1\u5b9a\u8fc7\u7a0b<\/h2>\n
\u63a5\u4e0b\u6765\u8fdb\u5165debug\u6a21\u5f0f\uff0c\u770b\u770bmvc\u662f\u5982\u4f55\u5c06\u6211\u4eecrequest\u4e2d\u7684\u53c2\u6570\u7ed1\u5b9a\u5230\u6211\u4eeccontroller\u5c42\u65b9\u6cd5\u5165\u53c2\u7684\uff1a<\/p><\/blockquote>\n
\u5199\u4e00\u4e2a\u7b80\u5355controller\uff0c\u4e0b\u4e2a\u65ad\u70b9\u770b\u770b\u65b9\u6cd5\u8c03\u7528\u6808\uff1a<\/p>\n
@GetMapping("\/getDate")\npublic LocalDateTime getDate(@RequestParam LocalDate date,\n                             @RequestParam LocalDateTime dateTime,\n                             @RequestParam Date originalDate) {\n    System.out.println(date);\n    System.out.println(dateTime);\n    System.out.println(originalDate);\n    return LocalDateTime.now();\n}<\/code><\/pre>\n
\u65ad\u4f4f\u4ee5\u540e\uff0c\u6211\u4eec\u770b\u4e0b\u65b9\u6cd5\u8c03\u7528\u6808\u4e2d\u4e00\u4e9b\u5173\u952e\u65b9\u6cd5\uff1a<\/p>\n
\/\/\u8fdb\u5165DispatcherServlet\ndoService:942, DispatcherServlet\n\/\/\u5904\u7406\u8bf7\u6c42\ndoDispatch:1038, DispatcherServlet\n\/\/\u751f\u6210\u8c03\u7528\u94fe\uff08\u524d\u5904\u7406\u3001\u5b9e\u9645\u8c03\u7528\u65b9\u6cd5\u3001\u540e\u5904\u7406\uff09\nhandle:87, AbstractHandlerMethodAdapter\n\/\/\u53cd\u5c04\u83b7\u53d6\u5230\u5b9e\u9645\u8c03\u7528\u65b9\u6cd5\uff0c\u51c6\u5907\u5f00\u59cb\u8c03\u7528\ninvokeHandlerMethod:895, RequestMappingHandlerAdapter\ninvokeAndHandle:102, ServletInvocableHandlerMethod\n\/\/\u8fd9\u91cc\u662f\u5173\u952e\uff0c\u53c2\u6570\u4ece\u8fd9\u91cc\u5f00\u59cb\u83b7\u53d6\u5230\ninvokeForRequest:142, InvocableHandlerMethod\ndoInvoke:215, InvocableHandlerMethod\n\/\/\u8fd9\u4e2a\u662fJava reflect\u8c03\u7528\uff0c\u56e0\u6b64\u4e00\u5b9a\u662f\u5728\u8fd9\u4e4b\u524d\u83b7\u53d6\u5230\u7684\u53c2\u6570\ninvoke:566, Method<\/code><\/pre>\n
\u6839\u636e\u4e0a\u8ff0\u5206\u6790\uff0c\u53d1\u73b0invokeForRequest:142, InvocableHandlerMethod\u8fd9\u91cc\u7684\u4ee3\u7801\u662f\u7528\u6765\u62ff\u5230\u5b9e\u9645\u53c2\u6570\u7684\uff1a<\/p>\n
@Nullable\npublic Object invokeForRequest(NativeWebRequest request, @Nullable ModelAndViewContainer mavContainer,\n        Object... providedArgs) throws Exception {\n    \/\/\u8fd9\u4e2a\u65b9\u6cd5\u662f\u83b7\u53d6\u53c2\u6570\u7684\uff0c\u5728\u8fd9\u91cc\u4e0b\u4e2a\u65ad\n    Object[] args = getMethodArgumentValues(request, mavContainer, providedArgs);\n    if (logger.isTraceEnabled()) {\n        logger.trace("Arguments: " + Arrays.toString(args));\n    }\n    \/\/\u8fd9\u91cc\u5f00\u59cb\u8c03\u7528\u65b9\u6cd5\n    return doInvoke(args);\n}<\/code><\/pre>\n
\u8fdb\u5165\u8fd9\u4e2a\u65b9\u6cd5\u770b\u770b\u662f\u4ec0\u4e48\u64cd\u4f5c\uff1a<\/p>\n
protected Object[] getMethodArgumentValues(NativeWebRequest request, @Nullable ModelAndViewContainer mavContainer,\n        Object... providedArgs) throws Exception {\n    \/\/\u83b7\u53d6\u65b9\u6cd5\u53c2\u6570\u6570\u7ec4\uff0c\u5305\u542b\u4e86\u5165\u53c2\u4fe1\u606f\uff0c\u6bd4\u5982\u7c7b\u578b\u3001\u6cdb\u578b\u7b49\u7b49\n    MethodParameter[] parameters = getMethodParameters();\n    \/\/\u8fd9\u4e2a\u7528\u6765\u5b58\u653e\u4e00\u4f1a\u4ecerequest parameter\u8f6c\u6362\u7684\u53c2\u6570\n    Object[] args = new Object[parameters.length];\n    for (int i = 0; i < parameters.length; i++) {\n        MethodParameter parameter = parameters[i];\n        parameter.initParameterNameDiscovery(this.parameterNameDiscoverer);\n        \/\/\u8fd9\u91cc\u770b\u8d77\u6765\u6ca1\u5565\u5375\u7528\uff08providedArgs\u4e3a\u7a7a\uff09\n        args[i] = resolveProvidedArgument(parameter, providedArgs);\n        \/\/\u8fd9\u91cc\u5f00\u59cb\u83b7\u53d6\u5230\u65b9\u6cd5\u5b9e\u9645\u8c03\u7528\u7684\u53c2\u6570\uff0c\u6b65\u8fdb\n        if (this.argumentResolvers.supportsParameter(parameter)) {\n            \/\/\u4ece\u540d\u5b57\u5c31\u770b\u51fa\u6765\uff1a\u53c2\u6570\u89e3\u6790\u5668\u89e3\u6790\u53c2\u6570\n            args[i] = this.argumentResolvers.resolveArgument(parameter, mavContainer, request, this.dataBinderFactory);\n            continue;\n        }\n    }\n    return args;\n}<\/code><\/pre>\n
\u8fdb\u5165resolveArgument\u770b\u770b\uff1a<\/p>\n
public Object resolveArgument(MethodParameter parameter, @Nullable ModelAndViewContainer mavContainer,\n        NativeWebRequest webRequest, @Nullable WebDataBinderFactory binderFactory) throws Exception {\n    \/\/\u6839\u636e\u65b9\u6cd5\u5165\u53c2\uff0c\u83b7\u53d6\u5bf9\u5e94\u7684\u89e3\u6790\u5668\n    HandlerMethodArgumentResolver resolver = getArgumentResolver(parameter);\n     \/\/\u5f00\u59cb\u89e3\u6790\u53c2\u6570\uff08\u628a\u8bf7\u6c42\u4e2d\u7684parameter\u8f6c\u4e3a\u65b9\u6cd5\u7684\u5165\u53c2\uff09\n    return resolver.resolveArgument(parameter, mavContainer, webRequest, binderFactory);\n}<\/code><\/pre>\n
\u8fd9\u91cc\u6839\u636e\u53c2\u6570\u83b7\u53d6\u76f8\u5e94\u7684\u53c2\u6570\u89e3\u6790\u5668\uff0c\u770b\u770b\u5185\u90e8\u5982\u4f55\u83b7\u53d6\u7684\uff1a<\/p>\n
\/\/\u904d\u5386\uff0c\u8c03\u7528supportParameter\u65b9\u6cd5\uff0c\u8ddf\u8fdb\u770b\u770b\nfor (HandlerMethodArgumentResolver methodArgumentResolver : this.argumentResolvers) {\n    if (methodArgumentResolver.supportsParameter(parameter)) {\n        result = methodArgumentResolver;\n        this.argumentResolverCache.put(parameter, result);\n        break;\n    }\n}<\/code><\/pre>\n
\u8fd9\u91cc\uff0c\u904d\u5386\u53c2\u6570\u89e3\u6790\u5668\uff0c\u67e5\u627e\u6709\u6ca1\u6709\u9002\u5408\u7684\u89e3\u6790\u5668\uff01\u90a3\u4e48\uff0c\u6709\u54ea\u4e9b\u53c2\u6570\u89e3\u6790\u5668\u5462(\u6211\u6d4b\u8bd5\u7684\u65f6\u5019\u670926\u4e2a)\uff1f\uff1f\uff1f\u6211\u5217\u51fa\u51e0\u4e2a\u91cd\u8981\u7684\u770b\u770b\uff0c\u662f\u4e0d\u662f\u5f88\u773c\u719f\uff01\uff01\uff01<\/strong><\/p>\n
{RequestParamMethodArgumentResolver@7686} \n{PathVariableMethodArgumentResolver@8359} \n{RequestResponseBodyMethodProcessor@8366} \n{RequestPartMethodArgumentResolver@8367} <\/code><\/pre>\n
\u6211\u4eec\u8fdb\u5165\u6700\u5e38\u7528\u7684\u4e00\u4e2a\u89e3\u6790\u5668\u770b\u770b\u4ed6\u7684supportsParameter\u65b9\u6cd5\uff0c\u53d1\u73b0\u5c31\u662f\u901a\u8fc7\u53c2\u6570\u6ce8\u89e3\u6765\u83b7\u53d6\u76f8\u5e94\u7684\u89e3\u6790\u5668\u7684\u3002<\/p>\n
public boolean supportsParameter(MethodParameter parameter) {\n    \/\/\u5982\u679c\u53c2\u6570\u62e5\u6709\u6ce8\u89e3@RequestParam\uff0c\u5219\u8d70\u8fd9\u4e2a\u5206\u652f\uff08\u77e5\u9053\u4e3a\u4ec0\u4e48\u4e0a\u6587\u8981\u5bf9RequestParam\u548cJson\u4e24\u79cd\u6570\u636e\u533a\u522b\u5bf9\u5f85\u4e86\u628a\uff09\n    if (parameter.hasParameterAnnotation(RequestParam.class)) {\n        \/\/\u8fd9\u4e2a\u4f3c\u4e4e\u662f\u5bf9Optional\u7c7b\u578b\u7684\u53c2\u6570\u8fdb\u884c\u5904\u7406\u7684\n        if (Map.class.isAssignableFrom(parameter.nestedIfOptional().getNestedParameterType())) {\n            RequestParam requestParam = parameter.getParameterAnnotation(RequestParam.class);\n            return (requestParam != null && StringUtils.hasText(requestParam.name()));\n        }\n        else {\n            return true;\n        }\n    }\n    \/\/......\n}<\/code><\/pre>\n
\u4e5f\u5c31\u662f\u8bf4\uff0c\u5bf9\u4e8e@RequestParam<\/code>\u548c@RequestBody<\/code>\u4ee5\u53ca@PathVariable<\/code>\u6ce8\u89e3\u7684\u53c2\u6570\uff0cSpringMVC\u4f1a\u4f7f\u7528\u4e0d\u901a\u7684\u53c2\u6570\u89e3\u6790\u5668\u8fdb\u884c\u6570\u636e\u7ed1\u5b9a\uff01<\/strong>
 \u90a3\u4e48\uff0c\u8fd9\u4e09\u79cd\u89e3\u6790\u5668\u5206\u522b\u4f7f\u7528\u4ec0\u4e48Converter\u89e3\u6790\u53c2\u6570\u5462\uff1f\u6211\u4eec\u5206\u522b\u8fdb\u5165\u4e09\u79cd\u89e3\u6790\u5668\u770b\u4e00\u770b\uff1a<\/strong>
 \u9996\u5148\u770b\u4e0bRequestParamMethodArgumentResolver<\/code>\u53d1\u73b0\u5185\u90e8\u4f7f\u7528WebDataBinder\u8fdb\u884c\u6570\u636e\u7ed1\u5b9a\uff0c\u5e95\u5c42\u4f7f\u7528\u7684\u662fConversionService \uff08\u4e5f\u5c31\u662f\u6211\u4eec\u7684Converter\u6ce8\u5165\u7684\u5730\u65b9\uff09<\/strong><\/p>\n
WebDataBinder binder = binderFactory.createBinder(webRequest, null, namedValueInfo.name);\n\/\/\u901a\u8fc7DataBinder\u8fdb\u884c\u6570\u636e\u7ed1\u5b9a\u7684\narg = binder.convertIfNecessary(arg, parameter.getParameterType(), parameter);<\/code><\/pre>\n
\/\/\u8ddf\u8fdbconvertIfNecessary()\npublic <T> T convertIfNecessary(@Nullable Object value, @Nullable Class<T> requiredType,\n        @Nullable MethodParameter methodParam) throws TypeMismatchException {\n\n    return getTypeConverter().convertIfNecessary(value, requiredType, methodParam);\n}<\/code><\/pre>\n
\/\/\u7ee7\u7eed\u8ddf\u8fdb\uff0c\u770b\u5230\u4e86\u628a\nConversionService conversionService = this.propertyEditorRegistry.getConversionService();\nif (editor == null && conversionService != null && newValue != null && typeDescriptor != null) {\n    TypeDescriptor sourceTypeDesc = TypeDescriptor.forObject(newValue);\n    if (conversionService.canConvert(sourceTypeDesc, typeDescriptor)) {\n        try {\n            return (T) conversionService.convert(newValue, sourceTypeDesc, typeDescriptor);\n        }\n        catch (ConversionFailedException ex) {\n            \/\/ fallback to default conversion logic below\n            conversionAttemptEx = ex;\n        }\n    }\n}<\/code><\/pre>\n
\u7136\u540e\u770b\u4e0bRequestResponseBodyMethodProcessor<\/code>\u53d1\u73b0\u4f7f\u7528\u7684\u8f6c\u6362\u5668\u662fHttpMessageConverter\u7c7b\u578b\u7684\uff1a<\/strong><\/p>\n
\/\/resolveArgument\u65b9\u6cd5\u5185\u90e8\u8c03\u7528\u4e0b\u9762\u8fdb\u884c\u53c2\u6570\u89e3\u6790\nObject arg = readWithMessageConverters(webRequest, parameter, parameter.getNestedGenericParameterType());\n\n\/\/step into readWithMessageConverters()\uff0c\u6211\u4eec\u770b\u5230\u8fd9\u91cc\u7684Converter\u662fHttpMessageConverter\nfor (HttpMessageConverter<?> converter : this.messageConverters) {\n    Class<HttpMessageConverter<?>> converterType = (Class<HttpMessageConverter<?>>) converter.getClass();\n    GenericHttpMessageConverter<?> genericConverter =\n            (converter instanceof GenericHttpMessageConverter ? (GenericHttpMessageConverter<?>) converter : null);\n    if (genericConverter != null ? genericConverter.canRead(targetType, contextClass, contentType) :\n            (targetClass != null && converter.canRead(targetClass, contentType))) {\n        if (message.hasBody()) {\n            HttpInputMessage msgToUse =\n                    getAdvice().beforeBodyRead(message, parameter, targetType, converterType);\n            body = (genericConverter != null ? genericConverter.read(targetType, contextClass, msgToUse) :\n                    ((HttpMessageConverter<T>) converter).read(targetClass, msgToUse));\n            body = getAdvice().afterBodyRead(body, msgToUse, parameter, targetType, converterType);\n        }\n        else {\n            body = getAdvice().handleEmptyBody(null, message, parameter, targetType, converterType);\n        }\n        break;\n    }\n}<\/code><\/pre>\n
\u6700\u540e\u770b\u4e0bPathVariableMethodArgumentResolver<\/code>\u53d1\u73b0 \u548cRequestParam\u8d70\u7684\u6267\u884c\u8def\u5f84\u4e00\u81f4\uff08\u4e8c\u8005\u90fd\u662f\u7ee7\u627f\u81eaAbstractNamedValueMethodArgumentResolver\u89e3\u6790\u5668\uff09\uff0c\u56e0\u6b64\u4ee3\u7801\u5c31\u4e0d\u8d34\u4e86\u3002<\/strong><\/p>\n
0xFF\u603b\u7ed3<\/h2>\n
\u5982\u679c\u8981\u8f6c\u6362request\u4f20\u6765\u7684\u53c2\u6570\u5230\u6211\u4eec\u6307\u5b9a\u7684\u7c7b\u578b\uff0c\u6839\u636e\u5165\u53c2\u6ce8\u89e3\u8981\u8fdb\u884c\u533a\u5206\uff1a<\/p>\n
\n
    \n
  1. \u5982\u679c\u662fRequestBody\uff0c\u90a3\u4e48\u901a\u8fc7\u914d\u7f6eObjectMapper\uff08\u8fd9\u4e2a\u73a9\u610f\u513f\u4f1a\u6ce8\u5165\u5230Jackson\u7684HttpMessagConverter\u91cc\u9762\uff0c\u5373MappingJackson2HttpMessageConverter<\/code>\u4e2d\uff09\u6765\u5b9e\u73b0Json\u683c\u5f0f\u6570\u636e\u7684\u5e8f\u5217\u5316\u548c\u53cd\u5e8f\u5217\u5316\uff1b<\/li>\n
  2. \u5982\u679c\u662fRequestParam\u6216\u8005PathVariable\u7c7b\u578b\u7684\u53c2\u6570\uff0c\u901a\u8fc7\u914d\u7f6eConverter\u5b9e\u73b0\u53c2\u6570\u8f6c\u6362\uff08\u8fd9\u4e9bConverter\u4f1a\u6ce8\u5165\u5230ConversionService\u4e2d\uff09\u3002<\/li>\n<\/ol>\n<\/blockquote>\n
    \u8fd1\u671f\u70ed\u6587\u63a8\u8350\uff1a<\/strong><\/p>\n
    1.1,000+ \u9053 Java\u9762\u8bd5\u9898\u53ca\u7b54\u6848\u6574\u7406(2022\u6700\u65b0\u7248)<\/a><\/p>\n
    2.\u52b2\u7206\uff01Java \u534f\u7a0b\u8981\u6765\u4e86\u3002\u3002\u3002<\/a><\/p>\n
    3.Spring Boot 2.x \u6559\u7a0b\uff0c\u592a\u5168\u4e86\uff01<\/a><\/p>\n
    4.\u522b\u518d\u5199\u6ee1\u5c4f\u7684\u7206\u7206\u7206\u70b8\u7c7b\u4e86\uff0c\u8bd5\u8bd5\u88c5\u9970\u5668\u6a21\u5f0f\uff0c\u8fd9\u624d\u662f\u4f18\u96c5\u7684\u65b9\u5f0f\uff01\uff01<\/a><\/p>\n
    5.\u300aJava\u5f00\u53d1\u624b\u518c\uff08\u5d69\u5c71\u7248\uff09\u300b\u6700\u65b0\u53d1\u5e03\uff0c\u901f\u901f\u4e0b\u8f7d\uff01<\/a><\/p>\n
    \u89c9\u5f97\u4e0d\u9519\uff0c\u522b\u5fd8\u4e86\u968f\u624b\u70b9\u8d5e+\u8f6c\u53d1\u54e6\uff01<\/p>\n
    https:\/\/segmentfault.com\/a\/1190000044159196<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
    \u4f5c\u8005\uff1aTinyThing\u94fe\u63a5\uff1ahttps:\/\/www.jianshu.com\/p\/b52db905f020 0 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-10008186","post","type-post","status-publish","format-standard","hentry","category-share"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10008186","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10008186"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10008186\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10008186"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10008186"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10008186"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}