package com.javaweb.app.common.config;
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import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.context.annotation.Primary;
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import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
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import com.fasterxml.jackson.annotation.JsonInclude.Include;
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import com.fasterxml.jackson.databind.ObjectMapper;
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/**
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* 〈返回json空值去掉null和""〉 〈功能详细描述〉
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*
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* @author gogym
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* @version 2017年10月13日
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* @see JacksonConfig
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* @since
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*/
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@Configuration
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public class JacksonConfig
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{
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@Bean
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@Primary
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@ConditionalOnMissingBean(ObjectMapper.class)
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public ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder)
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{
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ObjectMapper objectMapper = builder.createXmlMapper(false).build();
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// 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
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// Include.Include.ALWAYS 默认
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// Include.NON_DEFAULT 属性为默认值不序列化
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// Include.NON_EMPTY 属性为 空（""） 或者为 NULL
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// 都不序列化，则返回的json是没有这个字段的。这样对移动端会更省流量
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// Include.NON_NULL 属性为NULL 不序列化,就是为null的字段不参加序列化
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// objectMapper.setSerializationInclusion(Include.NON_EMPTY);
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// 字段保留，将null值转为""
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objectMapper.setSerializationInclusion(Include.NON_EMPTY);
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// objectMapper.getSerializerProvider().setNullValueSerializer(new
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// JsonSerializer<Object>()
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// {
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// @Override
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// public void serialize(Object o, JsonGenerator jsonGenerator,
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// SerializerProvider serializerProvider)
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// throws IOException, JsonProcessingException
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// {
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// jsonGenerator.writeString("");
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// }
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// });
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return objectMapper;
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}
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}
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