Jackson deserializes the generic list (using Javatype to convert the JSON string to a generic list)

New= "[{\" name\ ": \" A\ ", \" password\ ": \" 345\ "},{\" name\ ": \" b\ ", \" password\ ": \" 123\ "}]";         // The first of these methods New Typereference<list<user>> () {/**/});        The second method Javatype Javatype = Mapper.gettypefactory (). Constructcollectiontype (List.class, User.class); List<user> List2 = Mapper.readvalue (JSON, javatype);

Jackson, I feel like the fastest framework for converting between Java and JSON, and of course Google's Gson is good, but it looks like Jackson's faster than anyone else's performance test on the web.

Jackson handles the conversion between the general JavaBean and JSON as long as the ReadValue and writevalueasstring two methods using the Objectmapper object can be implemented. However, if you want to convert a complex type collection such as List<yourbean>, then you need to deserialize the collection type that is a generic of complex types.

If it is arraylist<yourbean> then use Objectmapper's Gettypefactory (). Constructparametrictype (Collectionclass, elementclasses);

If it is hashmap<string,yourbean> then Objectmapper gettypefactory (). Constructparametrictype (HashMap.class, String.class, Yourbean.class);

 Public FinalObjectmapper mapper =NewObjectmapper ();  Public Static voidMain (string[] args)throwsexception{javatype Javatype= Getcollectiontype (ArrayList.class, Yourbean.class); List<YourBean> LST = (list<yourbean>) Mapper.readvalue (jsonstring, Javatype); }          /*** Gets the collection type of the generic type *@paramcollectionclass Generic Collection *@paramelementclasses Element class *@returnjavatype Java Type *@since1.0*/        Public StaticJavatype Getcollectiontype (class<?> collectionclass, class<?>... elementclasses) {           returnmapper.gettypefactory (). Constructparametrictype (Collectionclass, elementclasses); }

Jackson deserializes the generic list (using Javatype to convert the JSON string to a generic list)