办法一：在Model中直接使用注解对时间进行格式化输出和时区选择
@JsonFormat(pattern = “yyyy-MM-dd HH:mm:ss”, locale = “zh”, timezone=”GMT+8”)

 @Temporal(TemporalType.TIMESTAMP)
    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", locale = "zh", timezone="GMT+8")
    public Date getPositionDate() {
        return positionDate;
    }

    public void setPositionDate(Date positionDate) {
        this.positionDate = positionDate;
    }

方法二：配置spring mvc时直接设置好时区等条件

 <mvc:annotation-driven>
        <!-- 处理请求时返回json字符串的中文乱码问题 -->
        <mvc:message-converters register-defaults="true">
            <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                <constructor-arg value="UTF-8" />
            </bean>
            <!--处理时区问题-->
            <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
                <property name="objectMapper">
                    <bean class="com.fasterxml.jackson.databind.ObjectMapper">
                        <!-- 处理responseBody 里面日期类型 -->
                        <property name="dateFormat">
                            <bean class="java.text.SimpleDateFormat">
                                <constructor-arg type="java.lang.String" value="yyyy-MM-dd HH:mm:ss" />
                            </bean>
                        </property>
                        <!-- 时区指定 -->
                        <property name="timeZone" value="GMT+8" />
                        <!-- 为null字段时不显示 -->
                        <property name="serializationInclusion">
                            <value type="com.fasterxml.jackson.annotation.JsonInclude.Include">NON_NULL</value>
                        </property>
                    </bean>
                </property>
           </bean>
        </mvc:message-converters>
    </mvc:annotation-driven>

方法三：手动继承ObjectMapper

public class JsonMapper extends ObjectMapper {

    private static final long serialVersionUID = 1L;

    private static Logger logger = LoggerFactory.getLogger(JsonMapper.class);

    private static JsonMapper mapper;

    public JsonMapper() {
        this(Include.NON_EMPTY);
    }

    public JsonMapper(Include include) {
        //设置时区
        this.setTimeZone(TimeZone.getTimeZone("GMT+8"));
        // 设置输出时包含属性的风格
        if (include != null) {
            this.setSerializationInclusion(include);
        }
        // 允许单引号、允许不带引号的字段名称
        this.enableSimple();
        // 设置输入时忽略在JSON字符串中存在但Java对象实际没有的属性
        this.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
        // 空值处理为空串
        this.getSerializerProvider().setNullValueSerializer(new JsonSerializer<Object>(){
            @Override
            public void serialize(Object value, JsonGenerator jgen,
                    SerializerProvider provider) throws IOException,
                    JsonProcessingException {
                jgen.writeString("");
            }
        });
    }

酱紫问题就解决了