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+/**
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+* @Company: 杭州朗通信息技术有限公司
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+* @Department: 系统软件部
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+* @Description: 朗通智能辅助诊疗系统
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+* @Address: 浙江省杭州市西湖区西斗门路3号 天堂软件园D-7B
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+*/
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+package org.diagbot.pub.utils.mapper;
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+
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+import java.io.IOException;
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+
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+import org.apache.commons.lang3.StringUtils;
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+import org.slf4j.Logger;
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+import org.slf4j.LoggerFactory;
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+
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+import com.fasterxml.jackson.annotation.JsonInclude.Include;
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+import com.fasterxml.jackson.core.JsonProcessingException;
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+import com.fasterxml.jackson.databind.DeserializationFeature;
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+import com.fasterxml.jackson.databind.JavaType;
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+import com.fasterxml.jackson.databind.ObjectMapper;
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+import com.fasterxml.jackson.databind.SerializationFeature;
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+import com.fasterxml.jackson.databind.util.JSONPObject;
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+import com.fasterxml.jackson.module.jaxb.JaxbAnnotationModule;
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+
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+/**
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+ * @Title: JsonMapper.java
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+ * @Package com.lantone.core.utils.mapper
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+ * @Description: 简单封装Jackson,实现JSON String<->Java Object的Mapper,封装不同的输出风格,
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+ * 使用不同的builder函数创建实例
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+ * @author 楼辉荣(Fyeman)
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+ * @date 2015年4月23日 下午11:58:46
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+ * @version V1.0
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+ */
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+@SuppressWarnings("unchecked")
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+public class JsonMapper {
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+
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+ private static Logger logger = LoggerFactory.getLogger(JsonMapper.class);
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+
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+ private ObjectMapper mapper;
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+
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+ public JsonMapper() {
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+ this(null);
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+ }
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+
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+ public JsonMapper(Include include) {
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+ mapper = new ObjectMapper();
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+ // 设置输出时包含属性的风格
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+ if (include != null) {
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+ mapper.setSerializationInclusion(include);
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+ }
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+ // 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
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+ mapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
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+ }
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+
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+ /**
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+ * 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.
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+ */
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+ public static JsonMapper nonEmptyMapper() {
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+ return new JsonMapper(Include.NON_EMPTY);
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+ }
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+
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+ /**
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+ * 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。
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+ */
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+ public static JsonMapper nonDefaultMapper() {
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+ return new JsonMapper(Include.NON_DEFAULT);
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+ }
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+
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+ /**
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+ * 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"[]".
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+ */
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+ public String toJson(Object object) {
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+
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+ try {
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+ return mapper.writeValueAsString(object);
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+ } catch (IOException e) {
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+ logger.warn("write to json string error:" + object, e);
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+ return null;
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+ }
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+ }
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+
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+ /**
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+ * 反序列化POJO或简单Collection如List<String>.
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+ *
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+ * 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.
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+ *
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+ * 如需反序列化复杂Collection如List<MyBean>, 请使用fromJson(String,JavaType)
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+ *
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+ * @see #fromJson(String, JavaType)
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+ */
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+ public <T> T fromJson(String jsonString, Class<T> clazz) {
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+ if (StringUtils.isEmpty(jsonString)) {
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+ return null;
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+ }
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+
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+ try {
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+ return mapper.readValue(jsonString, clazz);
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+ } catch (IOException e) {
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+ logger.warn("parse json string error:" + jsonString, e);
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+ return null;
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+ }
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+ }
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+
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+ /**
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+ * 反序列化复杂Collection如List<Bean>, 先使用函數createCollectionType构造类型,然后调用本函数.
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+ *
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+ * @see #createCollectionType(Class, Class...)
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+ */
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+ public <T> T fromJson(String jsonString, JavaType javaType) {
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+ if (StringUtils.isEmpty(jsonString)) {
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+ return null;
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+ }
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+
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+ try {
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+ return (T) mapper.readValue(jsonString, javaType);
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+ } catch (IOException e) {
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+ logger.warn("parse json string error:" + jsonString, e);
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+ return null;
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+ }
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+ }
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+
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+ /**
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+ * 構造泛型的Collection Type如: ArrayList<MyBean>,
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+ * 则调用constructCollectionType(ArrayList.class,MyBean.class)
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+ * HashMap<String,MyBean>, 则调用(HashMap.class,String.class, MyBean.class)
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+ */
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+ public JavaType createCollectionType(Class<?> collectionClass, Class<?>... elementClasses) {
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+ return mapper.getTypeFactory().constructParametricType(collectionClass, elementClasses);
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+ }
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+
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+ /**
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+ * 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.
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+ */
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+ public <T> T update(String jsonString, T object) {
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+ try {
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+ return (T) mapper.readerForUpdating(object).readValue(jsonString);
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+ } catch (JsonProcessingException e) {
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+ logger.warn("update json string:" + jsonString + " to object:" + object + " error.", e);
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+ } catch (IOException e) {
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+ logger.warn("update json string:" + jsonString + " to object:" + object + " error.", e);
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+ }
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+ return null;
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+ }
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+
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+ /**
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+ * 輸出JSONP格式數據.
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+ */
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+ public String toJsonP(String functionName, Object object) {
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+ return toJson(new JSONPObject(functionName, object));
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+ }
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+
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+ /**
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+ * 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.
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+ * 注意本函數一定要在Mapper創建後, 所有的讀寫動作之前調用.
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+ */
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+ public void enableEnumUseToString() {
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+ mapper.enable(SerializationFeature.WRITE_ENUMS_USING_TO_STRING);
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+ mapper.enable(DeserializationFeature.READ_ENUMS_USING_TO_STRING);
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+ }
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+
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+ /**
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+ * 支持使用Jaxb的Annotation,使得POJO上的annotation不用与Jackson耦合。
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+ * 默认会先查找jaxb的annotation,如果找不到再找jackson的。
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+ */
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+ public void enableJaxbAnnotation() {
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+ JaxbAnnotationModule module = new JaxbAnnotationModule();
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+ mapper.registerModule(module);
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+ }
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+
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+ /**
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+ * 取出Mapper做进一步的设置或使用其他序列化API.
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+ */
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+ public ObjectMapper getMapper() {
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+ return mapper;
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+ }
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+}
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