public interface WebMvcConfigurer {
default void configurePathMatch(PathMatchConfigurer configurer) {
}
default void configureContentNegotiation(ContentNegotiationConfigurer configurer) {
}
default void configureAsyncSupport(AsyncSupportConfigurer configurer) {
}
...
}
我们来定义自己的WebMvcConfigurer，并且重写一个JSON输出的格式
@Configuration
@EnableWebMvc //覆盖默认的配置
public class WebMvcConfigurerImpl implements WebMvcConfigurer {
@Override
public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
MappingJackson2HttpMessageConverter jackson2HttpMessageConverter = new MappingJackson2HttpMessageConverter();
ObjectMapper objectMapper = new ObjectMapper();
/**
* 序列换成Json时,将所有的Long变成String
* 因为js中得数字类型不能包括所有的java Long值
*/
SimpleModule simpleModule = new SimpleModule();
simpleModule.addSerializer(Long.class, ToStringSerializer.instance);
simpleModule.addSerializer(Long.TYPE, ToStringSerializer.instance);
// 所有的double类型返回保留三位小数
simpleModule.addSerializer(BigDecimal.class, new MoneySerialize());
// double保留两位小数
simpleModule.addSerializer(Double.class, new DoubleSerialize());
simpleModule.addSerializer(Double.TYPE, new DoubleSerialize());
objectMapper.registerModule(simpleModule);
jackson2HttpMessageConverter.setObjectMapper(objectMapper);
converters.add(jackson2HttpMessageConverter);
}
/**
* money serializer.
*/
public class MoneySerialize extends JsonSerializer<Object> {
//修改要除的数据
final BigDecimal TEMP = BigDecimal.valueOf(1000000L);
@Override
public void serialize(Object value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
if (value != null) {
BigDecimal bigDecimal = new BigDecimal(value.toString());
gen.writeNumber(bigDecimal.divide(TEMP, 4, RoundingMode.DOWN));
}
}
}
/**
* double serializer.
*/
public class DoubleSerialize extends JsonSerializer<Double> {
private DecimalFormat df = new DecimalFormat("##.00");
@Override
public void serialize(Double value, JsonGenerator gen, SerializerProvider serializers)
throws IOException, JsonProcessingException {
if (value != null) {
gen.writeString(df.format(value));
}
}
}
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