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规范、简化Json操作，可选Jackson、FastJson实现。并可在TopNB查看耗时统计信息。
There is a newer version: 0.9.12
package io.leopard.json;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ObjectWriter;

public class JsonJacksonImpl implements IJson {
	private static ObjectMapper mapper = new ObjectMapper(); // can reuse, share
	private static ObjectMapper mapperIgnoreUnknownField = new ObjectMapper(); // 忽略不存在的字段.
	private static ObjectWriter writer;

	static {
		// DeserializationConfig.
		// writer.wi
		// mapper.setAnnotationIntrospector(ai)

		// 自定义 Jackson 注解与禁用某一特定的注解
		// http: // gloveangels.com/customize-jackson-annotation-and-disable-specific-annotation/
		// mapper
		// JsonIgnore dd;
		// mapperIgnoreUnknownField.configure(JsonGenerator.Feature.IGNORE_UNKNOWN, true);
		mapper.setAnnotationIntrospector(new DisablingJsonSerializerIntrospector());
		writer = mapper.writer().withDefaultPrettyPrinter();
		mapperIgnoreUnknownField.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
	}

	/**
	 * 将对象转成json.
	 * 
	 * @param obj 对象
	 * @return
	 */
	@Override
	public String toFormatJson(Object obj) {
		if (obj == null) {
			return null;
		}
		try {
			return writer.writeValueAsString(obj);
		}
		catch (Exception e) {
			throw new JsonException(e.getMessage(), e);
		}

	}

	/**
	 * 将对象转成json.
	 * 
	 * @param obj 对象
	 * @return
	 */
	@Override
	public String toJson(Object obj) {
		try {
			String json;
			if (obj == null) {
				json = null;
			}
			else {
				json = mapper.writeValueAsString(obj);
			}
			return json;
		}
		catch (Exception e) {
			throw new JsonException(e.getMessage(), e);
		}
	}

	// @SuppressWarnings("deprecation")
	@Override
	public  List toListObject(String json, Class clazz) {
		if (json == null || json.length() == 0) {
			return null;
		}
		JavaType javaType = mapper.getTypeFactory().constructParametrizedType(ArrayList.class, List.class, clazz);
		try {
			return mapper.readValue(json, javaType);
		}
		catch (Exception e) {
			throw new JsonException(e.getMessage(), e);
		}
	}

	@Override
	public  List toListObject(String json, Class clazz, boolean ignoreUnknownField) {
		if (!ignoreUnknownField) {
			return this.toListObject(json, clazz);
		}
		if (json == null || json.length() == 0) {
			return null;
		}
		JavaType javaType = mapperIgnoreUnknownField.getTypeFactory().constructParametrizedType(ArrayList.class, List.class, clazz);
		try {
			return mapperIgnoreUnknownField.readValue(json, javaType);
		}
		catch (Exception e) {
			throw new JsonException(e.getMessage(), e);
		}
	}
	// public static  List toObject(List jsonList, Class valueType) {
	// return toObject(jsonList, valueType, false);
	// }

	// public static  List toObject(List jsonList, Class valueType, boolean ignoreUnknownField) {
	// if (jsonList == null || jsonList.isEmpty()) {
	// return null;
	// }
	// List list = new ArrayList();
	// for (String json : jsonList) {
	// list.add(JsonJacksonImpl.toObject(json, valueType, ignoreUnknownField));
	// }
	// return list;
	// }

	// @SuppressWarnings("unchecked")
	// public static Map toMap(String content) {
	// return JsonJacksonImpl.toObject(content, Map.class);
	// }
	//
	// @SuppressWarnings("unchecked")
	// public static Set