spring 中json使用

1.json序列化工具

public class JsonUtils {
    /**
     * Logger for this class
     */
    private static final Logger logger = LoggerFactory.getLogger(JsonUtils.class);

    private final static ObjectMapper objectMapper = new ObjectMapper();

    static {
        objectMapper.configure(JsonParser.Feature.ALLOW_COMMENTS, true);
        objectMapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);
        objectMapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
        objectMapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_CONTROL_CHARS, true);
        objectMapper.configure(JsonParser.Feature.INTERN_FIELD_NAMES, true);
        objectMapper.configure(JsonParser.Feature.CANONICALIZE_FIELD_NAMES, true);
        objectMapper.configure(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES, false);
    }

    private JsonUtils() {
    }

    public static String encode(Object obj) {
        try {
            return objectMapper.writeValueAsString(obj);
        } catch (JsonGenerationException e) {
            logger.error("encode(Object)", e); //$NON-NLS-1$
        } catch (JsonMappingException e) {
            logger.error("encode(Object)", e); //$NON-NLS-1$
        } catch (IOException e) {
            logger.error("encode(Object)", e); //$NON-NLS-1$
        }
        return null;
    }

    /**
     * 将json string反序列化成对象
     *
     * @param json
     * @param valueType
     * @return
     */
    public static <T> T decode(String json, Class<T> valueType) {
        try {
            return objectMapper.readValue(json, valueType);
        } catch (JsonParseException e) {
            logger.error("decode(String, Class<T>)", e);
        } catch (JsonMappingException e) {
            logger.error("decode(String, Class<T>)", e);
        } catch (IOException e) {
            logger.error("decode(String, Class<T>)", e);
        }
        return null;
    }

    /**
     * 将json array反序列化为对象
     *
     * @param json
     * @param jsonTypeReference
     * @return
     */
    @SuppressWarnings("unchecked")
    public static <T> T decode(String json, TypeReference<T> typeReference) {
        try {
            return (T) objectMapper.readValue(json, typeReference);
        } catch (JsonParseException e) {
            logger.error("decode(String, JsonTypeReference<T>)", e);
        } catch (JsonMappingException e) {
            logger.error("decode(String, JsonTypeReference<T>)", e);
        } catch (IOException e) {
            logger.error("decode(String, JsonTypeReference<T>)", e);
        }
        return null;
    }

}

2.springmvc中自定义JsonConvert

@ControllerAdvice
public class MyWebBindingInitializer implements WebBindingInitializer {

    @Autowired
    private MappingJackson2HttpMessageConverter jackson2HttpMessageConverter;

    @InitBinder
    @Override
    public void initBinder(WebDataBinder webDataBinder) {
        webDataBinder.registerCustomEditor(String.class, new StringTrimmerEditor(true));
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        dateFormat.setLenient(false);
        webDataBinder.registerCustomEditor(Date.class, new CustomDateEditor(dateFormat, true));

        ObjectMapper objectMapper=jackson2HttpMessageConverter.getObjectMapper();
        objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
        SimpleModule simpleModule = new SimpleModule();
        objectMapper.registerModule(simpleModule);
        objectMapper.configure(JsonParser.Feature.ALLOW_NUMERIC_LEADING_ZEROS, true);
    }

}