package com.feeyo.kafka.util; import java.util.Arrays; import java.util.List; import com.alibaba.fastjson.JSON; import com.alibaba.fastjson.TypeReference; import com.alibaba.fastjson.serializer.JSONSerializer; import com.alibaba.fastjson.serializer.PropertyFilter; import com.alibaba.fastjson.serializer.SerializeWriter; import com.alibaba.fastjson.serializer.SerializerFeature; /** * 字节处理相关工具类 * * @author jianghang */ @SuppressWarnings("unchecked") public class JsonUtils { // 输出空置字段 private static final SerializerFeature[] features = { SerializerFeature.WriteMapNullValue, SerializerFeature.WriteNullListAsEmpty, SerializerFeature.WriteNullNumberAsZero, SerializerFeature.WriteNullBooleanAsFalse, SerializerFeature.WriteNullStringAsEmpty, SerializerFeature.DisableCircularReferenceDetect }; public static <T> T unmarshalFromByte(byte[] bytes, Class<T> targetClass) { return (T) JSON.parseObject(bytes, targetClass);// 默认为UTF-8 } public static <T> T unmarshalFromByte(byte[] bytes, TypeReference<T> type) { return (T) JSON.parseObject(bytes, type.getType()); } public static byte[] marshalToByte(Object obj) { return JSON.toJSONBytes(obj); // 默认为UTF-8 } public static byte[] marshalToByte(Object obj, SerializerFeature... features) { return JSON.toJSONBytes(obj, features); // 默认为UTF-8 } public static <T> T unmarshalFromString(String json, Class<T> targetClass) { return (T) JSON.parseObject(json, targetClass);// 默认为UTF-8 } public static <T> T unmarshalFromString(String json, TypeReference<T> type) { return (T) JSON.parseObject(json, type);// 默认为UTF-8 } /* public static String marshalToString(Object obj) { return JSON.toJSONString(obj); // 默认为UTF-8 }*/ public static String marshalToString(Object obj) { return JSON.toJSONString(obj, features); // 默认为UTF-8 } public static String marshalToString(Object obj, SerializerFeature... features) { return JSON.toJSONString(obj, features); // 默认为UTF-8 } /** * 可以允许指定一些过滤字段进行生成json对象 */ public static String marshalToString(Object obj, String... fliterFields) { final List<String> propertyFliters = Arrays.asList(fliterFields); SerializeWriter out = new SerializeWriter(); try { JSONSerializer serializer = new JSONSerializer(out); serializer.getPropertyFilters().add(new PropertyFilter() { public boolean apply(Object source, String name, Object value) { return !propertyFliters.contains(name); } }); serializer.write(obj); return out.toString(); } finally { out.close(); } } }