import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.json.JsonReadFeature;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.json.JsonMapper;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateTimeSerializer;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import java.io.IOException;
import java.math.BigDecimal;
import java.text.DecimalFormat;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
/**
 * @Author: plani
 * 創(chuàng)建時(shí)間: 2020/9/22 9:41
 */
@Configuration
public class JacksonConfig {
    @Bean
    @Primary
    @ConditionalOnMissingBean(ObjectMapper.class)
    public ObjectMapper jacksonObjectMapper()
    {
        JsonMapper.Builder builder = JsonMapper.builder();
        // 通過(guò)該方法對(duì)mapper對(duì)象進(jìn)行設(shè)置，所有序列化的對(duì)象都將按改規(guī)則進(jìn)行系列化
        // Include.Include.ALWAYS 默認(rèn)
        // Include.NON_DEFAULT 屬性為默認(rèn)值不序列化
        // Include.NON_EMPTY 屬性為 空（""） 或者為 NULL 都不序列化，則返回的json是沒(méi)有這個(gè)字段的。這樣對(duì)移動(dòng)端會(huì)更省流量
        // Include.NON_NULL 屬性為NULL 不序列化
        builder.serializationInclusion(JsonInclude.Include.NON_EMPTY);
        //有未知屬性 要不要拋異常
        builder.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        //是否允許JSON字符串包含未轉(zhuǎn)義的控制字符(值小于32的ASCII字符，包括制表符和換行符)的特性。如果feature設(shè)置為false，則在遇到這樣的字符時(shí)拋出異常。
        builder.configure(JsonReadFeature.ALLOW_UNESCAPED_CONTROL_CHARS, true);
        //確定解析器是否允許使用單引號(hào)(撇號(hào)，字符'\ ")引用字符串(名稱和字符串值)的特性。如果是，這是除了其他可接受的標(biāo)記。但不是JSON規(guī)范)。
        builder.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
        JsonMapper jsonMapper = builder.build();
        JavaTimeModule javaTimeModule = new JavaTimeModule();
        //添加 序列器  這里是對(duì) BigDecimal 類型處理，這是關(guān)鍵代碼
        javaTimeModule.addSerializer(BigDecimal.class, new JsonSerializer<BigDecimal>() {
            @Override
            public void serialize(BigDecimal value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
                DecimalFormat fnum = new DecimalFormat("#.##");
                //把 這個(gè)BigDecimal 屬性對(duì)應(yīng)的值，寫成 String 類型
                gen.writeString(fnum.format(value));
            }
        });
        //處理 時(shí)間格式
        javaTimeModule.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
        //注冊(cè)
        jsonMapper.registerModule(javaTimeModule);
        return jsonMapper;
    }
}

   @PostMapping("test")
    public Map test() {
        Map<String, Object> map = new HashMap<>();
        BigDecimal bigDecimal = new BigDecimal("280.00");
        map.put("one", bigDecimal);
        return map;
    }

 private int price;
    @JsonProperty("cover_img")
    private String coverImg;
    @JsonFormat(pattern = "yyyy-MM-dd hh:mm:ss",locale = "zh",timezone = "GMT+8")
    @JsonProperty("create_time")
    private Date createTime;
    @JsonInclude(JsonInclude.Include.NON_NULL)
    private List<Chapter> chapterList;