package com.weiresearch.properties;import com.fasterxml.jackson.annotation.JsonInclude;import com.fasterxml.jackson.core.JsonGenerator;import com.fasterxml.jackson.core.JsonProcessingException;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;/** * 〈返回json空值去掉null和""〉 〈功能详细描述〉 *  * @author gogym * @version 2017年10月13日 * @see JacksonConfig * @since */@Configurationpublic class JacksonConfig{    @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是没有这个字段的。这样对移动端会更省流量        // Include.NON_NULL 属性为NULL 不序列化,就是为null的字段不参加序列化        //objectMapper.setSerializationInclusion(Include.NON_EMPTY);        objectMapper.setSerializationInclusion(JsonInclude.Include.NON_EMPTY);        // 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, JsonProcessingException        {            jsonGenerator.writeString("");        }    });*/        return objectMapper;    }}