json處理對象（Jackson）

• Z时代
• 2024-01-10
• 分类：综合

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.extern.slf4j.Slf4j;
import java.util.List;
import java.util.Map;
import java.util.Optional;
/**
 * json util
 */
@Slf4j
public class JacksonUtils {
    private static JsonGenerator jsonGenerator = null;
    private static ObjectMapper objectMapper = null;
    static {
        if (objectMapper == null) {
            objectMapper = new ObjectMapper();
        }
        //jsonGenerator = objectMapper.getFactory().createGenerator(outputStream, JsonEncoding.UTF8);
        objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
        objectMapper.setSerializationInclusion(JsonInclude.Include.NON_EMPTY);
//        objectMapper.setConfig(JsonParser.Feature.ALLOW_UNQUOTED_CONTROL_CHARS,Boolean.TRUE);
//        objectMapper.setConfig(JsonParser.Feature.ALLOW_BACKSLASH_ESCAPING_ANY_CHARACTER,Boolean.TRUE);
//        objectMapper.setConfig(JsonParser.Feature.ALLOW_SINGLE_QUOTES,Boolean.TRUE);
//        objectMapper.setConfig(JsonParser.Feature.ALLOW_NON_NUMERIC_NUMBERS,Boolean.TRUE);
    }
    public static Optional<String> obj2Str(Object obj){
        try {
            if (obj != null){
                if (obj.getClass() == String.class){
                    return Optional.of(obj.toString());
                }
                return Optional.ofNullable(objectMapper.writeValueAsString(obj));
            }
        }catch (Exception e){
            log.error(">>>>>>JacksonUtils obj2Str() Exception");
        }
        return Optional.empty();
    }
    public static <T> Optional<T> str2Bean(String json,Class<T> tClass){
        try {
            return Optional.ofNullable(objectMapper.readValue(json,tClass));
        }catch (Exception e){
            log.error(">>>>>>JacksonUtils str2Bean() Exception");
        }
        return Optional.empty();
    }
    public static <E> Optional<List<E>> str2List(String json, Class<E> tClass){
        try {
            return Optional.ofNullable(objectMapper.readValue(json,objectMapper.getTypeFactory().constructCollectionType(List.class,tClass)));
        }catch (Exception e){
            log.error(">>>>>>JacksonUtils str2List() Exception");
        }
        return Optional.empty();
    }
    public static <K,V> Optional<Map<K,V>> str2Map(String json, Class<K> kClass, Class<V> vClass){
        try {
            return Optional.ofNullable(objectMapper.readValue(json,objectMapper.getTypeFactory().constructMapType(Map.class,kClass,vClass)));
        }catch (Exception e){
            log.error(">>>>>>JacksonUtils str2Map() Exception");
        }
        return Optional.empty();
    }
}

以上是 json處理對象（Jackson） 的全部内容， 来源链接： utcz.com/z/511797.html