java的jackson包 jackson string to object

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.type.CollectionLikeType;

import java.util.List;

public class JsonUtils {

    static ObjectMapper objectMapper = new ObjectMapper();
    /**
     * 字符串转对象
     * @param str
     * @param clazz
     * @param <T>
     * @return
     */
    public  static  <T> T str2Obj(String str,Class<T> clazz){

        T t=null;
        try {
            t=objectMapper.readValue(str,clazz);
        } catch (JsonProcessingException e) {
            e.printStackTrace();
        }
        return t;
    }


    /**
     * 对象转字符串
     * @param object
     * @return
     */
    public static String obj2Str(Object object){
        try {
            if (object!=null) {
                return objectMapper.writeValueAsString(object);
            }
        } catch (JsonProcessingException e) {
            e.printStackTrace();
        }

        return "";
    }

    /**\
     * 字符串转集合
     * @param str
     * @param clazz
     * @param <T>
     * @return
     */
    public static <T> List<T> str2List(String str,Class<T> clazz){
        CollectionLikeType collectionLikeType = objectMapper.getTypeFactory().constructCollectionType(List.class, clazz);
        try {
            List<T> list = objectMapper.readValue(str, collectionLikeType);
            return list;
        } catch (JsonProcessingException e) {
            e.printStackTrace();
        }

        return null;
    }

}