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。
2.9.5 的逻辑 又和 2.8.10 一样。
这就是坑。