处理json工具类JacksonUtil，jsonjacksonutil,引用Maven库：

处理json工具类JacksonUtil，jsonjacksonutil,引用Maven库：

引用Maven库：

        <!-- Jackson -->        <dependency>            <groupId>com.fasterxml.jackson.core</groupId>            <artifactId>jackson-core</artifactId>            <version>2.4.3</version>        </dependency>        <dependency>            <groupId>com.fasterxml.jackson.core</groupId>            <artifactId>jackson-databind</artifactId>            <version>2.4.3</version>        </dependency>

代码细节：

public class JacksonUtil {    private static final Logger logger = LoggerFactory.getLogger(JacksonUtil.class);    private static final ObjectMapper objectMapper = new ObjectMapper();    static {        /**         * 默认非空不输出，时间格式         */        objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);        objectMapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));    }    /**     * 将 Java 对象转为 JSON 字符串     */    public static <T> String toJSON(T obj) {        String jsonStr;        try {            jsonStr = objectMapper.writeValueAsString(obj);        } catch (Exception e) {            logger.error("Java 转 JSON 出错！", e);            throw new RuntimeException(e);        }        return jsonStr;    }    /**     * 将 JSON 字符串转为 Java 对象     */    public static <T> T fromJSON(String json, Class<T> type) {        T obj;        try {            obj = objectMapper.readValue(json, type);        } catch (Exception e) {            logger.error("JSON 转 Java 出错！", e);            throw new RuntimeException(e);        }        return obj;    }}