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1.编写注解使用的类
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import java.io.IOException;
import java.math.RoundingMode;
import java.text.DecimalFormat;
public class DoubleSerialize extends JsonSerializer<Double> {
private DecimalFormat df = new DecimalFormat("0.00");
@Override
public void serialize(Double value, JsonGenerator gen, SerializerProvider serializers)
throws IOException, JsonProcessingException {
if(value != null) {
df.setMaximumFractionDigits(2);//显示几位修改几
df.setGroupingSize(0);
df.setRoundingMode(RoundingMode.FLOOR);
gen.writeString(df.format(value));
}
}
}
2.在需要被注解修改的数据上调用
@Data
public class ValuationAmountVo {
@JsonSerialize(using = DoubleSerialize.class)
private double valuation;
@JsonSerialize(using = DoubleSerialize.class)
private double amount;
}