解决HttpMessageNotReadableException: JSON parse error: Unrecognized field “xxxx“-优快云博客

本文链接：https://blog.youkuaiyun.com/fenfenguai/article/details/121752586

本文档介绍了如何在SpringBoot2.0.9中处理JSON解析错误，当POST请求的@RequestBody遇到不属于对象属性的字段时，通过配置Jackson忽略未知属性并格式化日期，以避免HttpMessageNotReadableException。修复方法包括在配置类中自定义MappingJackson2HttpMessageConverter，设置忽略未知属性，并调整日期格式。

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环境：SpringBoot 2.0.9（最新版本的Springboot不存在此问题）

问题描述：

post请求@requestBody接收对象时提示

org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Unrecognized field "aaaaa" (class com.ex.application.model.RiskAudit), not marked as ignorable; nested exception is com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "aaaaa" (class com.ex.application.model.RiskAudit), not marked as ignorable (25 known properties: "xxx"])
 at [Source: (PushbackInputStream); line: 4, column: 15] (through reference chain: com.ex.application.model.RiskAudit["aaaaa"])

aaaaa不属于RiskAudit对象的属性

问题修复

@Configuration
public class WebConfig implements WebMvcConfigurer {
    @Autowired
    private Jackson2ObjectMapperBuilder jackson2ObjectMapperBuilder;

	/**
     * 忽略不匹配的属性 或者 在响应对象上面添加 @JsonIgnoreProperties(ignoreUnknown = true)注解
     * @param converters
     */
    @Bean
    public MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter() {
        MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        converter.setObjectMapper(objectMapper);
        return converter;
    }

    /**
     * 格式化日期 （我本地用了LocalDateTime，不加此方法在获取数据时LocalDateTime会变成一个对象）
     * @param converters
     */
    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        ObjectMapper mapper = jackson2ObjectMapperBuilder.build();
        mapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));
        converters.add(0, new MappingJackson2HttpMessageConverter(mapper));
    }

}