java的json与字符串之间的转换

import java.io.IOException;

import org.springframework.util.StringUtils;

import com.fasterxml.jackson.databind.ObjectMapper;

public class JsonUtils {

    private static ObjectMapper objectMapper = new ObjectMapper();
    
    //对象转字符串
    public static  String obj2String(T obj){
        if (obj == null){
            return null;
        }
        try {
            return obj instanceof String ? (String) obj : objectMapper.writeValueAsString(obj);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
    
    //字符串转对象
    public static  T string2Obj(String str,Class clazz){
        if (StringUtils.isEmpty(str) || clazz == null){
            return null;
        }
        try {
            return clazz.equals(String.class)? (T) str :objectMapper.readValue(str,clazz);
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
    }
}