json deserialize using jackson api

Question

pojo class

class Authentication {

 private static final long serialVersionUID = 3808270497038004505L;

    public Authentication(){
}

private String userName;

private String passWord;

public String getuserName() {
    return userName;
}

public void setuserName(String userName) {
    userName = userName;
}

public String getpassWord() {
    return passWord;
}

public void setpassWord(String passWord) {
    passWord = passWord;
}
}

controller

Authentication authentication= (Authentication) new JSONDeserializer<T>().deserialize(data,Authentication.class);
 return new ModelAndView().addObject(authentication);

passing data

  {"userName":"kadires","passWord":"ramgopal"}

result

System.out.println(authentication.getpassWord()+authentication.getuserName());

{"authentication":{"userName":null,"passWord":null}}

please help me

Answer 1

Check if your setters are correctly written. First letter after get must be uppercase.

Also you could create your implementation of NullSerializer. For example:

public class NullSerializer extends JsonSerializer<Object> {

    @Override
    public void serialize(Object value, JsonGenerator jgen, SerializerProvider provider) throws IOException, JsonProcessingException {
        jgen.writeString("");
    }
}

Then just set your NullSerializer to the ObjectMapper:

ObjectMapper objMapper = new ObjectMapper();
StdSerializerProvider sp = new StdSerializerProvider();
sp.setNullValueSerializer(new NullSerializer());
objMapper.setSerializerProvider(sp);

Answer 2

问题可能是setter，它们以小写字母setuser ... setpassword开头，首字母大写，这是惯例。