Java中對象和json互相轉換的工具類

package com.Dingyu.util; import java.util.List; import com.fasterxml.jackson.core.JsonProcessingException; import com.fasterxml.jackson.databind.JavaType; import com.fasterxml.jackson.databind.ObjectMapper; /** * */
public class JsonUtils { // 定義jackson對象
    private static final ObjectMapper MAPPER = new ObjectMapper(); /** * 將對象轉換成json字符串。 * <p>Title: pojoToJson</p> * <p>Description: </p> * @param data * @return
     */
    public static String objectToJson(Object data) { try { String string = MAPPER.writeValueAsString(data); return string; } catch (JsonProcessingException e) { e.printStackTrace(); } return null; } /** * 將json結果集轉化為對象 * * @param jsonData json數據 * @param clazz 對象中的object類型 * @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; } /** * 將json數據轉換成pojo對象list * <p>Title: jsonToList</p> * <p>Description: </p> * @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; }
    
}