java对象与json格式相互转换的工具类

1. 内容

public class PfJacksonUtils {
    private PfJacksonUtils() {

    }

    public static String beanToJson(Object obj) throws JsonProcessingException {
        ObjectMapper objectMapper = new ObjectMapper();
        return objectMapper.writeValueAsString(obj);
    }

    public static <T> T jsonToBean(String json, Class<T> cls)
            throws JsonParseException, JsonMappingException, IOException {
        ObjectMapper objectMapper = new ObjectMapper();
        if (json == null) {
            return objectMapper.readValue("{}", cls);
        }
        return objectMapper.readValue(json, cls);
    }

    public static String mapToJson(Map<String, String> map) throws JsonProcessingException {
        ObjectMapper mapper = new ObjectMapper();
        return mapper.writeValueAsString(map);
    }

    public static <T> T jsonToBeanByMatchAttribute(String json, Class<T> cls)
            throws JsonParseException, JsonMappingException, IOException {
        if (StringUtils.isEmpty(json)) {
            return null;
        }
        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        return objectMapper.readValue(json, cls);
    }
}

2. 用法

String json = PfJacksonUtils.beanToJson(object);
PmDataInfo pmDataInfo = PfJacksonUtils.jsonToBeanByMatchAttribute(json, PmDataInfo.class);