Java Play! toJson ignore certain methods - json

Question

Is it possible to serialize an object using toJson(object) and have the toJson-parser ignore certain methods?
We have a method in a User class (getSocial - which is concerned with Facebook integration) that makes the toJson()-parsing fail - and we'd like it go ignore that method when serializing if possible.
Can this be done?

Answer 1

You can just iterate the object and rewrite it to Map or List with specified values only.
Note that if you are choosing your objects with Ebean it fetches whole object, also data, which shouldn't be fetched (as password or other credentials)

Answer 2

use fastjson & PropertyFilter:
Sample Code
import com.alibaba.fastjson.serializer.JSONSerializer;
import com.alibaba.fastjson.serializer.PropertyFilter;
import com.alibaba.fastjson.serializer.SerializeWriter;
PropertyFilter filter = new PropertyFilter() {
public boolean apply(Object source, String name, Object value) {
return false;
}
};
SerializeWriter out = new SerializeWriter();
JSONSerializer serializer = new JSONSerializer(out);
serializer.getPropertyFilters().add(filter);
A a = new A();
serializer.write(a);
String text = out.toString();
Assert.assertEquals("{}", text);
PropertyFilter
PropertyFilter filter = new PropertyFilter() {
public boolean apply(Object source, String name, Object value) {
if("name".equals(name)) {
return true;
}
return false;
}
};
SerializeWriter out = new SerializeWriter();
JSONSerializer serializer = new JSONSerializer(out);
serializer.getPropertyFilters().add(filter);
A a = new A();
a.setName("chennp2008");
serializer.write(a);
String text = out.toString();
Assert.assertEquals("{\"name\":\"chennp2008\"}", text);
ValueObject:
public static class A {
private int id;
private String name;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}