Solution 1: Customize global serialization
After the project went online, the product purchase failed because the price was incorrect at 30.495, but the database was 30.50.
- Define the problem as BigDecimal loses precision
- Serialize BigDecimal type data into String type and pass it to the front end to solve the problem. The front-end value let or var is not strongly typed.
1. The custom serialization class inherits the StdSerializer class and re-serialize method
public class BigDecimalStringSerializer extends StdSerializer<BigDecimal> {
public final static BigDecimalStringSerializer instance = new BigDecimalStringSerializer();
public BigDecimalStringSerializer() {
super(BigDecimal.class);
}
@Override
public void serialize(BigDecimal value, JsonGenerator gen, SerializerProvider provider) throws IOException {
if(value==null){
gen.writeString("0");
}else{
String val=value.stripTrailingZeros().toPlainString();
gen.writeString(val);
}
}
}
Two, configure global serialization
/**
* Jackson配置类
*/
@Configuration
public class JacksonConfig {
@Bean
@Primary
@ConditionalOnMissingBean(ObjectMapper.class)
public ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder) {
ObjectMapper objectMapper = builder.createXmlMapper(false).build();
SimpleModule bigDecimalModule = new SimpleModule();
//序列化将BigDecimal转String类型
bigDecimalModule.addSerializer(BigDecimal.class, BigDecimalStringSerializer.instance);
bigDecimalModule.addKeySerializer(BigDecimal.class, BigDecimalStringSerializer.instance);
// 注册转换器
objectMapper.registerModule(bigDecimalModule);
// json不返回null的字段
objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
return objectMapper;
}
}
Three, test
Create entity classes for testing
@Data
public class UserDetail {
private BigDecimal price;
private String phone;
}
@GetMapping("/user/detail")
public UserDetail userdetail(){
return new UserDetail(BigDecimal.valueOf(2L),"12345");
}
- After this configuration is String type
Solution 2: Add annotation @JsonSerialize(using= ToStringSerializer.class)
Directly add the annotation @JsonSerialize(using = ToStringSerializer.class) to the field of BBigDecimal type
@JsonSerialize(using= ToStringSerializer.class)
private BigDecimal price;
- The effect is the same, but the disadvantage is that each BigDecimal type attribute needs to add this annotation.