JavaUtils-JsonUtil.template

package com.sd.packagename.common.util;

import java.util.List;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

/**
 * @Created with Atom
 * @author @author@
 * @time @now@
 * @description
 * json转换工具类
 *
 **/

public class JsonUtils {
  // 定义jackson对象
  private static final ObjectMapper MAPPER = new ObjectMapper();

  /**
   * 将对象转换成json字符串。
   * Title: pojoToJson
   * Description:
   * @param data
   * @return
   */
  public static String objectToJson(Object data) {
    try {
      String string = MAPPER.writeValueAsString(data);
      return (string);
    } catch (JsonProcessingException e) {
      e.printStackTrace();
    }
    return (null);
  }

  /**
   * 将json结果集转化为对象
   *
   * @param jsonData json数据
   * @param clazz 对象中的object类型
   * @return
   */
  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);
  }

  /**
   * 将json数据转换成pojo对象list
   * Title: jsonToList
   * Description:
   * @param jsonData
   * @param beanType
   * @return
   */
  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);
  }
}