jackjson-databind-2.9.3 笔记

问题

客户端请求：

{"skip":0,"take":10,"corpName":"","cityCode":{}}

服务器端接收参数

 ???????????@RequestBody query: ListQueryModel, ???????????corpName: String

调试

jackson-databind-2.9.3.jar!/com/fasterxml/jackson/databind/deser/BeanDeserializer.class

private final Object vanillaDeserialize(JsonParser p, DeserializationContext ctxt, JsonToken t) throws IOException { ???????Object bean = this._valueInstantiator.createUsingDefault(ctxt); ???????p.setCurrentValue(bean); ???????if (p.hasTokenId(5)) { ???????????String propName = p.getCurrentName(); ???????????do { ???????????????p.nextToken(); ???????????????SettableBeanProperty prop = this._beanProperties.find(propName); ???????????????if (prop != null) { ???????????????????try { ???????????????????????prop.deserializeAndSet(p, ctxt, bean); ???????????????????} catch (Exception var8) { ???????????????????????this.wrapAndThrow(var8, bean, propName, ctxt); ???????????????????} ???????????????} else { ???????????????????this.handleUnknownVanilla(p, ctxt, bean, propName); ???????????????} ???????????} while((propName = p.nextFieldName()) != null); ???????} ???????return bean; ???}

对比之前的版本：
jackson-databind-2.8.10-sources.jar!/com/fasterxml/jackson/databind/deser/BeanDeserializer.java

private final Object vanillaDeserialize(JsonParser p, ???????????DeserializationContext ctxt, JsonToken t) ???????throws IOException ???{ ???????final Object bean = _valueInstantiator.createUsingDefault(ctxt); ???????// [databind#631]: Assign current value, to be accessible by custom serializers ???????p.setCurrentValue(bean); ???????if (p.hasTokenId(JsonTokenId.ID_FIELD_NAME)) { ???????????String propName = p.getCurrentName(); ???????????do { ???????????????p.nextToken(); ???????????????SettableBeanProperty prop = _beanProperties.find(propName); ???????????????if (prop != null) { // normal case ???????????????????try { ???????????????????????prop.deserializeAndSet(p, ctxt, bean); ???????????????????} catch (Exception e) { ???????????????????????wrapAndThrow(e, bean, propName, ctxt); ???????????????????} ???????????????????continue; ???????????????} ???????????????handleUnknownVanilla(p, ctxt, bean, propName); ???????????} while ((propName = p.nextFieldName()) != null); ???????} ???????return bean; ???} ???protected void handleUnknownVanilla(JsonParser p, DeserializationContext ctxt, Object bean, String propName) ???????throws IOException ???{ ???????if (_ignorableProps != null && _ignorableProps.contains(propName)) { ???????????handleIgnoredProperty(p, ctxt, bean, propName); ???????} else if (_anySetter != null) { ???????????try { ??????????????// should we consider return type of any setter? ???????????????_anySetter.deserializeAndSet(p, ctxt, bean, propName); ???????????} catch (Exception e) { ???????????????wrapAndThrow(e, bean, propName, ctxt); ???????????} ???????} else { ???????????// Unknown: let's call handler method ???????????handleUnknownProperty(p, ctxt, bean, propName); ????????????????} ???} ???protected void handleUnknownProperty(JsonParser p, DeserializationContext ctxt, ???????????Object beanOrClass, String propName) ???????throws IOException ???{ ???????if (_ignoreAllUnknown) { ???????????p.skipChildren(); ???????????return; ???????} ???????if (_ignorableProps != null && _ignorableProps.contains(propName)) { ???????????handleIgnoredProperty(p, ctxt, beanOrClass, propName); ???????} ???????// Otherwise use default handling (call handler(s); if not ???????// handled, throw exception or skip depending on settings) ???????super.handleUnknownProperty(p, ctxt, beanOrClass, propName); ???}

jackson-databind-2.8.10-sources.jar!/com/fasterxml/jackson/databind/deser/std/StdDeserializer.java

 ???protected void handleUnknownProperty(JsonParser p, DeserializationContext ctxt, Object instanceOrClass, String propName) ???????throws IOException ???{ ???????if (instanceOrClass == null) { ???????????instanceOrClass = handledType(); ???????} ???????// Maybe we have configured handler(s) to take care of it? ???????if (ctxt.handleUnknownProperty(p, this, instanceOrClass, propName)) { ???????????return; ???????} ???????/* But if we do get this far, need to skip whatever value we ????????* are pointing to now (although handler is likely to have done that already) ????????*/ ???????p.skipChildren(); ???}

对比发现

2.8.10 会忽略掉客户端请求中多余的属性。
2.9.3 会报错。

这就是坑。

jackjson-databind-2.9.3 笔记

原文地址：https://www.cnblogs.com/newsea/p/9062705.html