Java gson replace password value on serialization
How do I replace the password field value with XXX
when de-serializing an object using Gson? I found this post: Gson: How to exclude certain fields from serialization without annotations that mostly skip the field. That would be an option, but I would rather replace the valueXXX
I also tried this:
GsonBuilder builder = new GsonBuilder().setPrettyPrinting();
builder.registerTypeAdapter(String.class, new JsonSerializer<String>(){
@Override public JsonElement serialize(String value, Type arg1, JsonSerializationContext arg2){
// could not find a way to determine the field name
return new JsonPrimitive(value);
}
});
Unfortunately I was unable to figure out the name of the field. So is there any other option?
I use Gson to register some objects in a "nice" way, so I don't have to worry about formatting when reading the logs.
source to share
I feel pretty lame posting this answer. But, this is what you can, it essentially copies and modifies the Java object before serialization.
public class User {
private static final Gson gson = new Gson();
public String name;
public String password;
public User(String name, String pwd){
this.name = name;
this.password = pwd;
}
@Override
protected Object clone() throws CloneNotSupportedException {
return new User(this.name, this.password);
}
public static void main(String[] aa){
JsonSerializer<User> ser = new JsonSerializer<User>() {
@Override
public JsonElement serialize(User u, Type t, JsonSerializationContext ctx) {
try {
User clone = (User)u.clone();
clone.password = clone.password.replaceAll(".","x");
return (gson.toJsonTree(clone, User.class));
} catch (CloneNotSupportedException e) {
//do something if you dont liek clone.
}
return gson.toJsonTree(u, User.class);
}
};
Gson g = new GsonBuilder().registerTypeAdapter(User.class, ser).create();
System.out.println(g.toJson(new User("naishe", "S3cr37")));
}
}
Receives serialization:
{"name":"naishe","password":"xxxxxx"}
source to share
You can skip the cloning step, just serialize it and then replace the password:
public JsonElement serialize(User u, Type t, JsonSerializationContext ctx) {
JsonObject obj = new Gson().toJsonTree(u).getAsJsonObject();
obj.remove("password");
obj.add("password", new JsonPrimitive("xxxxx");
return obj;
}
source to share