aop拦截:
`
import com.fasterxml.jackson.databind.introspect.Annotated;
import com.fasterxml.jackson.databind.introspect.JacksonAnnotationIntrospector;
import com.xyzq.afa.customer.format.CustomDoubleSerialize;
import com.xyzq.afa.customer.format.DoubleFormatter;
public class DoubleFormatterAnnotationIntrospector extends JacksonAnnotationIntrospector {
private static final long serialVersionUID = 7368707128625539909L;
@Override
public Object findSerializer(Annotated annotated) {
DoubleFormatter formatter = annotated.getAnnotation(DoubleFormatter.class);
if (formatter != null) {
return new CustomDoubleSerialize(formatter.pattern());
}
return super.findSerializer(annotated);
}
}
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import java.io.IOException;
import java.text.DecimalFormat;
/**
-
设置默认返回的小数类型(0.00)
*/
public class CustomDoubleSerialize extends JsonSerializer{
private DecimalFormat df;public CustomDoubleSerialize(String pattern) {
this.df = new DecimalFormat(pattern);
}@Override
public void serialize(Double value, JsonGenerator jgen, SerializerProvider provider) throws IOException {
jgen.writeString(this.df.format(value));
}
}
``
自定义注解
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
/**
- 自定义double格式化注解
*/
public @interface DoubleFormatter {
String pattern() default "###,##0.00";
}
`