configureMessageConverters:
覆盖此方法以添加自定义 HttpMessageConverters 以与 RequestMappingHandlerAdapter 和 ExceptionHandlerExceptionResolver 一起使用。将转换器添加到列表会关闭默认情况下会注册的默认转换器。另请参阅 addDefaultHttpMessageConverters 以添加默认消息转换器。
代码:自定义 WebMvcConfigurationSupport:
package com.itheima.pinda.config;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.databind.ser.std.DateSerializer;
import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateDeserializer;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalTimeDeserializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateSerializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateTimeSerializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalTimeSerializer;
@Slf4j
@Configuration
@EnableSwagger2
public class ConfigurationSupport extends WebMvcConfigurationSupport {
/**
* deserializerByType 解决string类型入参转为 LocalDateTime 格式问题
*
* @return
*/
//ackson2ObjectMapperBuilderCustomizer:希望通过保留其默认自动配置的Jackson2ObjectMapperBuilder进一步自定义ObjectMapper的 bean 可以实现回调接口。
@Bean
public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer() {
return builder -> builder
// .deserializerByType(Enum.class, EnumDeserializer.INSTANCE)
.deserializerByType(LocalDateTime.class, new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_TIME_FORMAT)))
.deserializerByType(LocalDate.class, new LocalDateDeserializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_FORMAT)))
.deserializerByType(LocalTime.class, new LocalTimeDeserializer(DateTimeFormatter.ofPattern(DEFAULT_TIME_FORMAT)));
}
/**
* 防止@EnableMvc把默认的静态资源路径覆盖了,手动设置的方式
*
* @param registry
*/
@Override
protected void addResourceHandlers(ResourceHandlerRegistry registry) {
// 解决静态资源无法访问
registry.addResourceHandler("/**").addResourceLocations("classpath:/static/");
// 解决swagger无法访问
registry.addResourceHandler("/swagger-ui.html").addResourceLocations("classpath:/META-INF/resources/");
// 解决swagger的js文件无法访问
registry.addResourceHandler("/webjars/**").addResourceLocations("classpath:/META-INF/resources/webjars/");
}
/**
* 解决序列化
*/
//配置HttpMessageConverters以用于读取或写入请求或响应的主体。如果未添加转换器,则会注册转换器的默认列表。
@Override
public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
log.info("初始化jackson配置( 枚举类型、时间格式 )");
//在json转换之前先进行string转换
converters.add(new StringHttpMessageConverter());
//添加json转换
MappingJackson2HttpMessageConverter jackson2HttpMessageConverter = new MappingJackson2HttpMessageConverter();
jackson2HttpMessageConverter.setObjectMapper(new JacksonObjectMapper());
converters.add(jackson2HttpMessageConverter);
//追加默认转换器
super.addDefaultHttpMessageConverters(converters);
}
protected static final String DEFAULT_DATE_TIME_FORMAT = "yyyy/MM/dd HH:mm:ss";
protected static final String DEFAULT_DATE_FORMAT= "yyyy/MM/dd";
protected static final String DEFAULT_TIME_FORMAT= "HH:mm:ss";
class JacksonObjectMapper extends ObjectMapper {
//ObjectMapper 提供了读取和写入 JSON 的功能,无论是从基本 POJO(Plain Old Java Objects)
// 还是从通用 JSON 树模型 ( JsonNode ) 读取和写入,以及执行转换的相关功能。
// 它也是高度可定制的,既可以处理不同风格的 JSON 内容,也可以支持更高级的对象概念,
// 例如多态性和对象标识。 ObjectMapper还充当更高级的ObjectReader和ObjectWriter类的工厂
public JacksonObjectMapper() {
super();
//收到未知属性时不报异常 public static final DeserializationFeature FAIL_ON_UNKNOWN_PROPERTIES
this.configure(FAIL_ON_UNKNOWN_PROPERTIES, false);
//反序列化时,属性不存在的兼容处理
this.getDeserializationConfig().withoutFeatures(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
//com.fasterxml.jackson.databind.module public class SimpleModule
SimpleModule simpleModule = new SimpleModule()
//addSerializer添加序列化程序以处理特定类型值的方法。
.addSerializer(BigInteger.class, ToStringSerializer.instance)
.addSerializer(BigDecimal.class, new BigDecimalSerializer())
.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_TIME_FORMAT)))
.addSerializer(LocalDate.class, new LocalDateSerializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_FORMAT)))
.addSerializer(LocalTime.class, new LocalTimeSerializer(DateTimeFormatter.ofPattern(DEFAULT_TIME_FORMAT)))
.addSerializer(Date.class, new DateSerializer(false, new SimpleDateFormat(DEFAULT_DATE_TIME_FORMAT)));
this.registerModule(simpleModule);
}
}
}