后台Long返回给前端Sting

深藏阁楼爱情的钟 2023-05-22 05:59 3阅读 0赞

正常前端可以处理了bigint,如果前端无法解决该问题可以采取如下配置
 
 第一步
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.core.JsonGenerator;
 import com.fasterxml.jackson.databind.DeserializationFeature;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.module.SimpleModule;
 import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
 
 /**
 * Title: JacksonMapper
 * Description: 
 * Copyright: Copyright (c) 2019
 *
 * @author ctl
 * @version 1.0
 * @date 2020-04-15 22:11
 */
 public class JacksonMapper extends ObjectMapper {
 
 public JacksonMapper() {
 super();
 this.configure(JsonGenerator.Feature.WRITE_BIGDECIMAL_AS_PLAIN, true);
 this.configure(JsonGenerator.Feature.IGNORE_UNKNOWN, true);
 this.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
 this.setSerializationInclusion(JsonInclude.Include.ALWAYS);
 
 SimpleModule simpleModule = new SimpleModule();
 simpleModule.addSerializer(Long.class, ToStringSerializer.instance);
 simpleModule.addSerializer(Long.TYPE, ToStringSerializer.instance);
 simpleModule.addSerializer(long.class, ToStringSerializer.instance);
 registerModule(simpleModule);
 
 }
 }

第二步在springmvc配置文件配置
 <mvc:annotation-driven>
 <mvc:message-converters>
 <bean
 class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
 <property name="objectMapper">
 <bean class="JacksonMapper"></bean>
 </property>
 </bean>
 </mvc:message-converters>
 </mvc:annotation-driven>spring-boot第二步可以使用下面替换
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.autoconfigure.http.HttpMessageConverters;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.http.converter.HttpMessageConverter;
 import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
 import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
 
 import java.util.List;
 
 /**
  * Title: WebConfig
  * Description: 
  * Copyright: Copyright (c) 2019
  *
  * @author ctl
  * @version 1.0
  * @date 2020-04-15 21:53
  */
 @Configuration
 public class WebConfig implements WebMvcConfigurer {
 
     @Autowired
     private HttpMessageConverters httpMessageConverters;
 
     /**
      * MappingJackson2HttpMessageConverter 实现了HttpMessageConverter 接口，
      * httpMessageConverters.getConverters() 返回的对象里包含了MappingJackson2HttpMessageConverter
      * @return
      */
     @Bean
     public MappingJackson2HttpMessageConverter getMappingJackson2HttpMessageConverter() {
         return new MappingJackson2HttpMessageConverter(new JacksonMapper());
     }
 
 
     @Override
     public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
         converters.addAll(httpMessageConverters.getConverters());
     }
 }
 
 
 
 另一种方式
 Java传值给前端进行JSON序列化时，将Long 类型转成string 类型序列化。（推荐）
 使用 @JsonSerialize(using = ToStringSerializer.class) 注解

/**
     * 主键
     */
    @JsonSerialize(using = ToStringSerializer.class)
    private Long id;

前端收到的是

"id":"9327445563932672"