基于Netty+Redis+protobuf开发的即时通讯服务器

package com.cdeer.im.common.util; import com.fasterxml.jackson.annotation.JsonInclude.Include; import com.fasterxml.jackson.databind.DeserializationFeature; import com.fasterxml.jackson.databind.JavaType; import com.fasterxml.jackson.databind.ObjectMapper; import org.apache.log4j.Logger; import java.io.IOException; import java.util.ArrayList; import java.util.LinkedList; import java.util.List; public class JacksonUtil { private static Logger Log = Logger.getLogger(JacksonUtil.class.getName()); private static ThreadLocal<ObjectMapper> objMapperLocal = new ThreadLocal<ObjectMapper>() { @Override public ObjectMapper initialValue() { ObjectMapper OBJECT_MAPPER = new ObjectMapper(); OBJECT_MAPPER.setSerializationInclusion(Include.NON_NULL);// 如果属性为null，不序列化成string OBJECT_MAPPER.configure( DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);// 当json有多余属性时，过滤掉此属性 return OBJECT_MAPPER; } }; /** * json转成list * * @param jsonString * @param clazz * @param <T> * @return * @throws IOException */ public static <T> List<T> json2List(String jsonString, Class<T> clazz) throws IOException { JavaType javaType = objMapperLocal.get().getTypeFactory().constructParametricType(ArrayList.class, clazz); List<T> lst = (List<T>) objMapperLocal.get().readValue(jsonString, javaType); return lst; } /** * json转成有序list * * @param jsonString * @param clazz * @param <T> * @return * @throws IOException */ public static <T> List<T> json2LinkedList(String jsonString, Class<T> clazz) throws IOException { JavaType javaType = objMapperLocal.get().getTypeFactory().constructParametricType(LinkedList.class, clazz); List<T> lst = (List<T>) objMapperLocal.get().readValue(jsonString, javaType); return lst; } /** * JSON转成对象 * * @param jsonString * @param clazz * @return */ public static <T> T json2Object(String jsonString, Class<T> clazz) throws IOException { if (jsonString == null || "".equals(jsonString)) { return null; } return objMapperLocal.get().readValue(jsonString, clazz); } /** * 将对象转化成json * * @param ob * @return */ public static String object2string(Object ob) { String str = ""; try { str = objMapperLocal.get().writeValueAsString(ob); } catch (Exception e) { Log.error(e.getMessage(), e); } return str; } /** * json转成对象 * * @param obj * @param clazz * @return */ public static <T> T object2Object(Object obj, Class<T> clazz) { try { String str = objMapperLocal.get().writeValueAsString(obj); return objMapperLocal.get().readValue(str, clazz); } catch (Exception e) { Log.error(e.getMessage(), e); } return null; } }