springboot返回数据null参数设为空字符串或空数组
package com.ruoyi.framework.config.ResponseVoConfig.WebConfig;
/**
* @Classname MyJsonMapper
* @Description TODO
* @Date 2022/1/20 0020 上午 10:39
* @Created by jcc
*/
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
import java.io.IOException;
import java.lang.reflect.Field;
import java.text.SimpleDateFormat;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import static com.fasterxml.jackson.databind.DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES;
/**
* jackson 定制
*
* @author lqq
*/
public class MyJsonMapper extends ObjectMapper {
public MyJsonMapper() {
super();
//收到未知属性时不报异常
this.configure(FAIL_ON_UNKNOWN_PROPERTIES, false);
//Long类型转为String类型
SimpleModule simpleModule = new SimpleModule();
//simpleModule.addSerializer(Long.class, ToStringSerializer.instance);
//simpleModule.addSerializer(Long.TYPE, ToStringSerializer.instance);
this.registerModule(simpleModule);
this.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss")); //设置日期格式
//处理空指针时设置的值
this.getSerializerProvider().setNullValueSerializer(new JsonSerializer
package com.ruoyi.framework.config.ResponseVoConfig.WebConfig;
/**
* @Classname WebConfig
* @Description TODO
* @Date 2022/1/20 0020 上午 10:39
* @Created by jcc
*/
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;
import java.util.List;
/**
* web 相关配置
*
* @author lqq
*/
@Configuration
public class WebConfig extends WebMvcConfigurationSupport {
@Override
public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
//在json转换之前先进行string转换
converters.add(new StringHttpMessageConverter());
//添加json转换
MappingJackson2HttpMessageConverter jackson2HttpMessageConverter = new MappingJackson2HttpMessageConverter();
jackson2HttpMessageConverter.setObjectMapper(new MyJsonMapper());
converters.add(jackson2HttpMessageConverter);
//5、追加默认转换器
super.addDefaultHttpMessageConverters(converters);
} }
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