[英]Deserialize object using function in Jackson json
I have a function that produces an object. 我有一个产生对象的函数。 Would it be possible to deserialize this object using Jackson JSON annotations?
使用Jackson JSON注释可以反序列化此对象吗?
class Foo{
Bar getBar(int par1, int par 2){
...
}
public static void main( String[] args ) {
String json = "{\"par1\":1,\"par2\":2}";
Bar bar = new ObjectMapper().<invoke function getBar>.readValue(json);
}
}
One way you can do that is parsing this Json String to Jacksons JsonNode
, and then invoke your method. 一种实现方法是将此Json String解析为Jacksons
JsonNode
,然后调用您的方法。
Something like this: 像这样:
public static void main( String[] args ) {
String json = "{\"par1\":1,\"par2\":2}";
JsonNode jsonNode = new ObjectMapper().readValue(json, JsonNode.class);
Bar bar = Foo.getBar(jsonNode.get("par1").asInt(), jsonNode.get("par2").asInt());
}
The possible solutiun is to add par1 and par2 to your Foo class. 可能的解决方法是将par1和par2添加到Foo类中。 But don't forget to add @JSONIgnore to "get" methods which aren't usefull for json parsing.
但是不要忘记将@JSONIgnore添加到“获取”方法中,这些方法对于json解析没有用。
class Foo{
int par1;
int par2;
@JsonIgnore
Bar getBar(){
//..par1 par2 logic;
}
int getPar1(){
return par1;
}
void setPar1(int par1) {
this.par1=par1;
}
//same setter\getter for par2
}
And then you can simply parse JSON to this object and call Bar method 然后您可以简单地将JSON解析到该对象并调用Bar方法
String json = "{\"par1\":1,\"par2\":2}";
Bar bar = new ObjectMapper().readValue(json,Foo.class).getBar();
You can tell Jackson to use a factory method or non default constructor using the @JsonCreator
annotation. 您可以通过
@JsonCreator
注释告诉Jackson使用工厂方法或非默认构造函数。 However, the method has to be part of the Class that is deserialized. 但是,该方法必须是反序列化的Class的一部分。 So, assuming
Bar
has a two args constructor: 因此,假设
Bar
有两个args构造函数:
public class Bar {
@JsonCreator
public Bar (@JsonProperty("par1") int par1, @JsonProperty("par2") int par 2) {
...
}
public static void main( String[] args ) {
String json = "{\"par1\":1,\"par2\":2}";
Bar bar = (Bar)new ObjectMapper().readValue(json, Bar.class);
}
}
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