Json - 通用工具类

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

import java.io.IOException;
import java.util.List;


public class JsonUtil {

    private static ObjectMapper objectMapper = new ObjectMapper();


    
    public static String object2JsonStr(Object obj){
        try {
            return objectMapper.writevalueAsString(obj);
        } catch (JsonProcessingException e) {
            e.printStackTrace();
        }
        return null;
    }

    
    public static  T jsonStr2object(String jsonStr, Class clazz){
        try {
            return objectMapper.readValue(jsonStr.getBytes("UTF-8"),clazz);
        } catch (JsonParseException e){
            e.printStackTrace();
        }catch (JsonMappingException e){
            e.printStackTrace();
        }catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

    
    public static List jsonToList(String jsonStr, Class beanType){
        JavaType javaType = objectMapper.getTypeFactory().constructParametricType(List.class, beanType);
        try {
            List list = objectMapper.readValue(jsonStr,javaType);
            return list;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
}