http://zhidao.baidu.com/link?url=buRL8gjIT75xDZgYJG7SwyB5EzES8cgiNPDCPLNMPXLVYyNR9tPbklmxOYWVzmTT0G1V1ewdcLmaTvTwnqTSF9ZS_hl8gC_Ed4iNdYD1XYu
看fastjson源码,SerializeWriter
public void writeEnum(Enum<?> value,char c) { if (value == null) { writeNull(); write(','); return; } if (isEnabled(SerializerFeature.WriteEnumUsingToString)) { if (isEnabled(SerializerFeature.UseSingleQuotes)) { write('\''); write(value.name()); write('\''); write(c); } else { write('\"'); write(value.name()); write('\"'); write(c); } return; } writeIntAndChar(value.ordinal(),c); }
可以看出SerializeWriter在初始化的时候,features不要设置SerializerFeature.WriteEnumUsingToString
因为JSON.DEFAULT_PARSER_FEATURE是enable了SerializerFeature.WriteEnumUsingToString,也就是说是读枚举的value值而不是int值
public static int DEFAULT_GENERATE_FEATURE; static { int features = 0; features |= com.alibaba.fastjson.serializer.SerializerFeature.QuoteFieldNames.getMask(); features |= com.alibaba.fastjson.serializer.SerializerFeature.SkipTransientField.getMask(); features |= com.alibaba.fastjson.serializer.SerializerFeature.WriteEnumUsingToString.getMask(); features |= com.alibaba.fastjson.serializer.SerializerFeature.SortField.getMask(); // features |= // com.alibaba.fastjson.serializer.SerializerFeature.WriteSlashAsSpecial.getMask(); DEFAULT_GENERATE_FEATURE = features; }
所以,解决你这个问题的方法就是
之前调用下
JSONSerializer.config(SerializerFeature.WriteEnumUsingToString,false);
我的实体类里面有一个熟悉是枚举类型的,但是我在转换的时候我不希望取它的name,而且她的索引值0,1,2,3,搜索一番后发现这个回答.
但是JSONSerializer.config不是一个静态方法,不能直接调用
而且如果直接调用JSON.toJSON把实体类转为json,这里还有另外一句代码
if (clazz.isEnum()) { return ((Enum<?>) javaObject).name(); }
如果是枚举类型,不管你怎么改配置都不会给你转成索引值的情况,所以我们这里就先想把实体转成jsonString,再把jsonString转成JSONObject。
再继续看fastjson的源码
在JOSN.toJSONString中
public static final String toJSONString(Object object,SerializerFeature... features) { SerializeWriter out = new SerializeWriter(); try { JSONSerializer serializer = new JSONSerializer(out); for (com.alibaba.fastjson.serializer.SerializerFeature feature : features) { serializer.config(feature,true); } serializer.write(object); return out.toString(); } finally { out.close(); } }
他这里也是用的serializer.config来配置的,干脆我们自己写个工具方法吧,同时把WriteEnumUsingToString禁用掉
private static final SerializerFeature[] CONFIG = new SerializerFeature[]{ SerializerFeature.WriteNullBooleanAsFalse,//boolean为null时输出false SerializerFeature.WriteMapNullValue,//输出空置的字段 SerializerFeature.WriteNonStringKeyAsString,//如果key不为String 则转换为String 比如Map的key为Integer SerializerFeature.WriteNullListAsEmpty,//list为null时输出[] SerializerFeature.WriteNullNumberAsZero,//number为null时输出0 SerializerFeature.WriteNullStringAsEmpty//String为null时输出"" }; public static JSONObject toJSON(Object javaObject) { SerializeWriter out = new SerializeWriter(); String jsonStr; try { JSONSerializer serializer = new JSONSerializer(out); for (com.alibaba.fastjson.serializer.SerializerFeature feature : CONFIG) { serializer.config(feature,true); } serializer.config(SerializerFeature.WriteEnumUsingToString,false); serializer.write(javaObject); jsonStr = out.toString(); } finally { out.close(); } JSONObject jsonObject = JSON.parSEObject(jsonStr); return jsonObject; }这样转换出来的结果,就是我们想要的数字了。