博客 - Spring返回json格式配置

import java.io.IOException;

​

import com.fasterxml.jackson.core.JsonGenerator;

import com.fasterxml.jackson.core.JsonParser;

import com.fasterxml.jackson.core.JsonProcessingException;

import com.fasterxml.jackson.databind.JsonSerializer;

import com.fasterxml.jackson.databind.ObjectMapper;

import com.fasterxml.jackson.databind.SerializerProvider;

​

/**

 * json返回的null转为空字符串

 * @author wst 2018-10-29 上午11:37:36

 *

 */

public class ObjectMappingCustomer extends ObjectMapper {

​

	private static final long serialVersionUID = 1L;

​

	public ObjectMappingCustomer() {

		super();

		// 允许单引号

		this.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, false);

		// 允许字段可以不用双引号

		this.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, false);

		// 数字作为字符串类型输入

		this.configure(JsonGenerator.Feature.WRITE_NUMBERS_AS_STRINGS, false);

		// 特殊数字类型（float/double values are output as quoted strings）

		this.configure(JsonGenerator.Feature.QUOTE_NON_NUMERIC_NUMBERS, false);

		// 空值处理为空串

		this.getSerializerProvider().setNullValueSerializer(

			new JsonSerializer<Object>() {

				@Override

				public void serialize(Object value, JsonGenerator jg, SerializerProvider sp) throws IOException, JsonProcessingException {

					jg.writeString("");

				}

			});

​

	}

}

    <mvc:annotation-driven>

        <mvc:message-converters>

            <bean class="org.springframework.http.converter.StringHttpMessageConverter">

                <property name="supportedMediaTypes">

                    <list>

                        <value>text/plain;charset=UTF-8</value>

                        <value>text/html;charset=UTF-8</value>

                    </list>

                </property>

            </bean>

            <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">

                <property name="supportedMediaTypes">

                    <list>

                        <value>application/json;charset=UTF-8</value>

                    </list>

                </property>

                <property name="objectMapper">  

                    <!-- ObjectMappingCustomer -->

	                <bean class="com.mov.mw.handler.ObjectMappingCustomer"></bean>  

	            </property> 				

            </bean>

        </mvc:message-converters>

    </mvc:annotation-driven>