java – 杰克逊反序列化错误处理
发布时间:2020-12-14 16:32:12 所属栏目:Java 来源:网络整理
导读:我的问题很简单:我有以下简单的类: public class Foo { private int id = -1; public void setId(int _id){ this.id = _id; } public int getId(){ return this.id; }} 我正在尝试处理以下JSON: { "id": "blah"} 显然,这里有一个问题(“blah”不能解析为i
我的问题很简单:我有以下简单的类:
public class Foo { private int id = -1; public void setId(int _id){ this.id = _id; } public int getId(){ return this.id; } } 我正在尝试处理以下JSON: { "id": "blah" } 显然,这里有一个问题(“blah”不能解析为int) 以前,杰克逊抛出像org.codehaus.jackson.map.JsonMappingException这样的东西:不能从String值’blah’构造java.lang.Integer的实例:不是有效的整数值 我同意这一点,但我想在某处允许忽略这种类型的映射错误. 你有任何关于这个问题的线索吗? 解决方法
我成功地解决了我的问题,谢谢
Tatu from Jackson ML.
我不得不为Jackson中处理的每个原始类型使用自定义的非阻塞解串器. public class JacksonNonBlockingObjectMapperFactory { /** * Deserializer that won't block if value parsing doesn't match with target type * @param <T> Handled type */ private static class NonBlockingDeserializer<T> extends JsonDeserializer<T> { private StdDeserializer<T> delegate; public NonBlockingDeserializer(StdDeserializer<T> _delegate){ this.delegate = _delegate; } @Override public T deserialize(JsonParser jp,DeserializationContext ctxt) throws IOException,JsonProcessingException { try { return delegate.deserialize(jp,ctxt); }catch (JsonMappingException e){ // If a JSON Mapping occurs,simply returning null instead of blocking things return null; } } } private List<StdDeserializer> jsonDeserializers = new ArrayList<StdDeserializer>(); public ObjectMapper createObjectMapper(){ ObjectMapper objectMapper = new ObjectMapper(); SimpleModule customJacksonModule = new SimpleModule("customJacksonModule",new Version(1,null)); for(StdDeserializer jsonDeserializer : jsonDeserializers){ // Wrapping given deserializers with NonBlockingDeserializer customJacksonModule.addDeserializer(jsonDeserializer.getValueClass(),new NonBlockingDeserializer(jsonDeserializer)); } objectMapper.registerModule(customJacksonModule); return objectMapper; } public JacksonNonBlockingObjectMapperFactory setJsonDeserializers(List<StdDeserializer> _jsonDeserializers){ this.jsonDeserializers = _jsonDeserializers; return this; } } 然后以这种方式调用它(作为解串器传递只有那些你想要阻止的): JacksonNonBlockingObjectMapperFactory factory = new JacksonNonBlockingObjectMapperFactory(); factory.setJsonDeserializers(Arrays.asList(new StdDeserializer[]{ // StdDeserializer,here,comes from Jackson (org.codehaus.jackson.map.deser.StdDeserializer) new StdDeserializer.ShortDeserializer(Short.class,null),new StdDeserializer.IntegerDeserializer(Integer.class,new StdDeserializer.CharacterDeserializer(Character.class,new StdDeserializer.LongDeserializer(Long.class,new StdDeserializer.FloatDeserializer(Float.class,new StdDeserializer.DoubleDeserializer(Double.class,new StdDeserializer.NumberDeserializer(),new StdDeserializer.BigDecimalDeserializer(),new StdDeserializer.BigIntegerDeserializer(),new StdDeserializer.CalendarDeserializer() })); ObjectMapper om = factory.createObjectMapper(); (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |