springMVC、boot返回属性的值为null转换为""空字符串

注：springMVC、boot都默认使用jackson数据转换json返回

1、添加pom配置

<dependency>
  <groupId>com.fasterxml.jackson.coregroupId>
  <artifactId>jackson-databindartifactId>
  <version>2.6.6version>
dependency>

2、代码：

package com.credit;

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;

/**
 * Created by LH on 2018/5/9.
 * 此类的作用：将原生jackson的返回值为null转化为“”，方便前台输出
 * @author LH
 */
@Configuration
public class JacksonConfig {

    @Bean
    @Primary
    @ConditionalOnMissingBean(ObjectMapper.class)
    public ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder) {
        ObjectMapper objectMapper = builder.createXmlMapper(false).build();
        objectMapper.getSerializerProvider().setNullValueSerializer(new JsonSerializer