JsonUtils Demo

通常在项目开发中会频繁进行JSON解析，所以这里就简单封装了jackson的相关方法，方便在项目中使用。

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

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.ObjectMapper;

public class JsonUtils {
	private static final ObjectMapper MAPPER = new ObjectMapper();

	public static String objectToJson(Object data) {
		try {
			String string = MAPPER.writeValueAsString(data);
			return string;
		} catch (JsonProcessingException e) {
			e.printStackTrace();
		}
		return null;
	}

	public static <T> T jsonToPojo(String jsonData, Class<T> beanType) {
		try {
			T t = MAPPER.readValue(jsonData, beanType);
			return t;
		} catch (Exception e) {
			e.printStackTrace();
		}

		return null;
	}

	public static <T> List<T> jsonToList(String jsonData, Class<T> beanType) {
		JavaType javaType = MAPPER.getTypeFactory().constructParametricType(List.class, beanType);

		try {
			List<T> list = MAPPER.readValue(jsonData, javaType);
			return list;
		} catch (Exception e) {
			e.printStackTrace();
		}

		return null;
	}

	public static <K, V> Map<K, V> jsonToMap(String jsonData, Class<K> keyType, Class<V> valueType) {
		JavaType javaType = MAPPER.getTypeFactory().constructMapType(Map.class, keyType, valueType);
		
		try {
			Map<K, V> map = MAPPER.readValue(jsonData, javaType);
			return map;
		} catch (Exception e) {
			e.printStackTrace();
		}

		return null;
	}
}