Springboot2.3.1搭建框架 Controller返回对象自动过滤null属性字段

    技术2022-07-10  150

    请您多多留言指教

    框架环境:

    springboot2.3.1+mybatisplus3.3.2+jackson2.11.0 全局配置自动过滤null属性字段

    1、application.yml 全局配置 jackson

    jackson: # 全局设置@JsonFormat的格式pattern date-format: yyyy-MM-dd HH:mm:ss # 当地时区 locale: zh # 设置全局时区 time-zone: GMT+8 serialization: #格式化输出 indent_output: true #忽略无法转换的对象 fail_on_empty_beans: false deserialization: #允许对象忽略json中不存在的属性 fail_on_unknown_properties: false parser: #允许出现特殊字符和转义符 allow_unquoted_control_chars: true #允许出现单引号 allow_single_quotes: true #如果加该注解的字段为null,那么就不序列化这个字段了 default-property-inclusion: NON_EMPTY

    2、类的配置jackson.config

    package com.ayiol.business.config; import com.fasterxml.jackson.annotation.JsonInclude; import com.fasterxml.jackson.core.JsonGenerator; import com.fasterxml.jackson.core.JsonParser; import com.fasterxml.jackson.databind.DeserializationFeature; import com.fasterxml.jackson.databind.JsonSerializer; import com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.databind.SerializerProvider; import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.Primary; import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder; import java.io.IOException; /** * Jackson config * author LJG * date 2020/6/26 20:46 */ @Configuration public class JacksonConfig { /** * 重新注入ObjectMapper * 注:使用此方式ObjectMapper,application中Jackson自动失效 * * @param builder * @return */ @Bean @Primary @ConditionalOnMissingBean(ObjectMapper.class) public ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder) { ObjectMapper objectMapper = builder.createXmlMapper(false).build(); // 通过该方法对mapper对象进行设置,所有序列化的对象都将按改规则进行系列化 // Include.Include.ALWAYS 默认 // Include.NON_DEFAULT 属性为默认值不序列化 // Include.NON_EMPTY 属性为 空("") 或者为 NULL 都不序列化,则返回的json无此属性字段 // Include.NON_NULL 属性为NULL 不序列化 objectMapper.setSerializationInclusion(JsonInclude.Include.NON_EMPTY); // 反序列化时 忽略匹配不到的属性字段 objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false); // 允许出现单引号 objectMapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true); // 字段保留,将null值转为"" objectMapper.getSerializerProvider().setNullValueSerializer(new JsonSerializer<Object>() { @Override public void serialize(Object o, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException { jsonGenerator.writeString(""); } }); return objectMapper; } }

    注:红色标记为重点,这种配置按需求使用(本人未使用:因需要返回相关为null的属性字段)

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