public class JsonMapper extends ObjectMapper {
private static final long serialVersionUID = 1L;
private static Logger logger = LoggerFactory.getLogger(JsonMapper.class);
private static JsonMapper mapper;
private static final List formarts = new ArrayList(4);
static{
formarts.add("yyyy-MM");
formarts.add("yyyy-MM-dd");
formarts.add("yyyy-MM-dd hh:mm");
formarts.add("yyyy-MM-dd hh:mm:ss");
}
public JsonMapper() {
this(Include.ALWAYS);
}
public JsonMapper(Include include) {
// 设置输出时包含属性的风格
if (include != null) {
this.setSerializationInclusion(include);
}
// 允许单引号、允许不带引号的字段名称
this.enableSimple();
// 设置输入时忽略在JSON字符串中存在但Java对象实际没有的属性
this.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
// 空值处理为空串
// this.getSerializerProvider().setNullValueSerializer(new JsonSerializer() {
// @Override
// public void serialize(Object value, JsonGenerator jgen,
// SerializerProvider provider) throws IOException,
// JsonProcessingException {
// jgen.writeString("");
// }
// });
// 进行HTML解码。
this.registerModule(new SimpleModule().addSerializer(String.class, new JsonSerializer() {
@Override
public void serialize(String value, JsonGenerator jgen,
SerializerProvider provider) throws IOException,
JsonProcessingException {
jgen.writeString(StringEscapeUtils.unescapeHtml4(value));
}
}));
// 设置时区
this.setTimeZone(TimeZone.getDefault());//getTimeZone("GMT+8:00")
this.registerModule(new SimpleModule().addSerializer(Date.class, new JsonSerializer() {
@Override
public void serialize(Date value, JsonGenerator jgen,
SerializerProvider provider) throws IOException,
JsonProcessingException {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
jgen.writeString(sdf.format(value));
}
}));
this.registerModule(new SimpleModule().addDeserializer(Date.class, new JsonDeserializer() {
@Override
public Date deserialize(JsonParser p, DeserializationContext ctxt) throws IOException, JsonProcessingException {
String source = p.getText().trim();
if(source.matches("^\\d{4}-\\d{1,2}$")){
return parseDate(source, formarts.get(0));
}else if(source.matches("^\\d{4}-\\d{1,2}-\\d{1,2}$")){
return parseDate(source, formarts.get(1));
}else if(source.matches("^\\d{4}-\\d{1,2}-\\d{1,2} {1}\\d{1,2}:\\d{1,2}$")){
return parseDate(source, formarts.get(2));
}else if(source.matches("^\\d{4}-\\d{1,2}-\\d{1,2} {1}\\d{1,2}:\\d{1,2}:\\d{1,2}$")){
return parseDate(source, formarts.get(3));
}else if(source.matches("^\\d{13}$")){//毫秒
return new Date(Long.parseLong(source));
}else if(source.matches("^\\d{10}$")){//秒
return new Date(Long.parseLong(source) * 1000);
}else {
throw new IllegalArgumentException("Invalid Date value '" + source + "'");
}
}
public Date parseDate(String dateStr, String format) {
Date date = null;
try {
DateFormat dateFormat = new SimpleDateFormat(format);
date = (Date) dateFormat.parse(dateStr);
} catch (Exception e) {
}
return date;
}
}));
}
/**
* 创建只输出非Null且非Empty(如List.isEmpty)的属性到Json字符串的Mapper,建议在外部接口中使用.
*
* @return JsonMapper 生成实例
*/
public static JsonMapper getInstance() {
if (mapper == null) {
mapper = new JsonMapper().enableSimple();
}
return mapper;
}
/**
* 创建只输出初始值被改变的属性到Json字符串的Mapper, 最节约的存储方式，建议在内部接口中使用。
*
* @return JsonMapper 生成实例
*/
public static JsonMapper nonDefaultMapper() {
if (mapper == null) {
mapper = new JsonMapper(Include.NON_DEFAULT);
}
return mapper;
}
/**
* Object可以是POJO，也可以是Collection或数组。
* 如果对象为Null, 返回"null".
* 如果集合为空集合, 返回"[]".
*
* @return String json字符格式
*/
public String toJson(Object object) {
try {
return this.writeValueAsString(object);
} catch (IOException e) {
logger.warn("write to json string error:" + object, e);
return null;
}
}
/**
* 反序列化POJO或简单Collection如List.
* 如果JSON字符串为Null或"null"字符串, 返回Null.
* 如果JSON字符串为"[]", 返回空集合.
*
* 如需反序列化复杂Collection如List, 请使用fromJson(String,JavaType)
*
* @return 反序列化后的对象
* @see #fromJson(String, JavaType)
*/
public T fromJson(String jsonString, Class clazz) {
if (StringUtils.isEmpty(jsonString)) {
return null;
}
try {
return this.readValue(jsonString, clazz);
} catch (IOException e) {
logger.warn("parse json string error:" + jsonString, e);
return null;
}
}
/**
* 反序列化复杂Collection如List, 先使用函數createCollectionType构造类型,然后调用本函数.
*
* @return 反序列化后的对象
* @see #createCollectionType(Class, Class...)
*/
public T fromJson(String jsonString, JavaType javaType) {
if (StringUtils.isEmpty(jsonString)) {
return null;
}
try {
return (T) this.readValue(jsonString, javaType);
} catch (IOException e) {
logger.warn("parse json string error:" + jsonString, e);
return null;
}
}
/**
* 構造泛型的Collection Type如:
* ArrayList, 则调用constructCollectionType(ArrayList.class,MyBean.class)
* HashMap, 则调用(HashMap.class,String.class, MyBean.class)
*
* @return 集合类型
*/
public JavaType createCollectionType(Class collectionClass, Class... elementClasses) {
return this.getTypeFactory().constructParametricType(collectionClass, elementClasses);
}
/**
* 當JSON裡只含有Bean的部分屬性時，更新一個已存在Bean，只覆蓋該部分的屬性.
*
* @return 更新后集合
*/
@SuppressWarnings("unchecked")
public T update(String jsonString, T object) {
try {
return (T) this.readerForUpdating(object).readValue(jsonString);
} catch (JsonProcessingException e) {
logger.warn("update json string:" + jsonString + " to object:" + object + " error.", e);
} catch (IOException e) {
logger.warn("update json string:" + jsonString + " to object:" + object + " error.", e);
}
return null;
}
/**
* 輸出JSONP格式數據.
*/
public String toJsonP(String functionName, Object object) {
return toJson(new JSONPObject(functionName, object));
}
/**
* 設定是否使用Enum的toString函數來讀寫Enum,
* 為False時時使用Enum的name()函數來讀寫Enum, 默認為False.
* 注意本函數一定要在Mapper創建後, 所有的讀寫動作之前調用.
*/
public JsonMapper enableEnumUseToString() {
this.enable(SerializationFeature.WRITE_ENUMS_USING_TO_STRING);
this.enable(DeserializationFeature.READ_ENUMS_USING_TO_STRING);
return this;
}
/**
* 允许单引号
* 允许不带引号的字段名称
*/
public JsonMapper enableSimple() {
this.configure(Feature.ALLOW_SINGLE_QUOTES, true);
this.configure(Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);
return this;
}
/**
* 取出Mapper做进一步的设置或使用其他序列化API.
*/
public ObjectMapper getMapper() {
return this;
}
/**
* 对象转换为JSON字符串
*
* @param object
* @return
*/
public static String toJsonString(Object object) {
return JsonMapper.getInstance().toJson(object);
}
/**
* JSON字符串转换为对象
*
* @param jsonString
* @param clazz
* @return
*/
public static T fromJsonString(String jsonString, Class clazz) {
return JsonMapper.getInstance().fromJson(jsonString, clazz);
}
/**
* JSON字符串转为集合对象
* @param jsonString
* @param collectionClass
* @param elementClasses
* @return
*/
public static T fromJsonString(String jsonString,Class collectionClass, Class... elementClasses) {
return JsonMapper.getInstance().fromJson(jsonString, JsonMapper.getInstance().createCollectionType(collectionClass,elementClasses));
}
}
