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+package com.caimei.utils;
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+
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+import com.fasterxml.jackson.annotation.JsonInclude.Include;
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+import com.fasterxml.jackson.core.JsonGenerator;
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+import com.fasterxml.jackson.core.JsonParser.Feature;
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+import com.fasterxml.jackson.core.JsonProcessingException;
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+import com.fasterxml.jackson.databind.*;
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+import com.fasterxml.jackson.databind.module.SimpleModule;
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+import com.fasterxml.jackson.databind.util.JSONPObject;
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+import org.apache.commons.lang3.StringEscapeUtils;
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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 java.io.IOException;
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+import java.util.TimeZone;
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+
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+/**
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+ * 简单封装Jackson，实现JSON String<->Java Object的Mapper.
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+ * 封装不同的输出风格, 使用不同的builder函数创建实例.
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+ */
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+public class JsonMapper extends ObjectMapper {
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+
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+ private static final long serialVersionUID = 1L;
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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 static JsonMapper mapper;
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+
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+ public JsonMapper() {
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+ this(Include.NON_EMPTY);
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+ }
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+
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+ public JsonMapper(Include include) {
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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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+ this.setSerializationInclusion(include);
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+ }
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+ // 允许单引号、允许不带引号的字段名称
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+ this.enableSimple();
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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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+ this.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
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+ // 空值处理为空串
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+ this.getSerializerProvider().setNullValueSerializer(new JsonSerializer<Object>(){
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+ @Override
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+ public void serialize(Object value, JsonGenerator jgen,
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+ SerializerProvider provider) throws IOException,
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+ JsonProcessingException {
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+ jgen.writeString("");
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+ }
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+ });
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+ // 进行HTML解码。
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+ this.registerModule(new SimpleModule().addSerializer(String.class, new JsonSerializer<String>(){
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+ @Override
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+ public void serialize(String value, JsonGenerator jgen,
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+ SerializerProvider provider) throws IOException,
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+ JsonProcessingException {
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+ jgen.writeString(StringEscapeUtils.unescapeHtml4(value));
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+ }
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+ }));
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+ // 设置时区
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+ this.setTimeZone(TimeZone.getDefault());//getTimeZone("GMT+8:00")
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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 getInstance() {
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+ if (mapper == null){
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+ mapper = new JsonMapper().enableSimple();
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+ }
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+ return mapper;
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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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+ if (mapper == null){
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+ mapper = new JsonMapper(Include.NON_DEFAULT);
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+ }
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+ return mapper;
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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。
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+ * 如果对象为Null, 返回"null".
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+ * 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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+ try {
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+ return this.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.
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+ * 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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+ * @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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+ try {
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+ return this.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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+ * @see #createCollectionType(Class, Class...)
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+ */
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+ @SuppressWarnings("unchecked")
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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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+ try {
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+ return (T) this.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:
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+ * ArrayList<MyBean>, 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 this.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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+ @SuppressWarnings("unchecked")
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+ public <T> T update(String jsonString, T object) {
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+ try {
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+ return (T) this.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,
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+ * 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 JsonMapper enableEnumUseToString() {
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+ this.enable(SerializationFeature.WRITE_ENUMS_USING_TO_STRING);
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+ this.enable(DeserializationFeature.READ_ENUMS_USING_TO_STRING);
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+ return this;
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+ }
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+
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+ /**
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+ * 允许单引号
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+ * 允许不带引号的字段名称
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+ */
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+ public JsonMapper enableSimple() {
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+ this.configure(Feature.ALLOW_SINGLE_QUOTES, true);
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+ this.configure(Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);
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+ return this;
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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 this;
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+ }
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+
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+ /**
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+ * 对象转换为JSON字符串
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+ * @param object
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+ * @return
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+ */
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+ public static String toJsonString(Object object){
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+ return JsonMapper.getInstance().toJson(object);
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+ }
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+
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+ /**
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+ * JSON字符串转换为对象
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+ * @param jsonString
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+ * @param clazz
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+ * @return
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+ */
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+ public static Object fromJsonString(String jsonString, Class<?> clazz){
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+ return JsonMapper.getInstance().fromJson(jsonString, clazz);
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+ }
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+
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+}
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lijun