TestCamelCase.java

import java.io.IOException;

import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.PropertyNamingStrategy;
import com.fasterxml.jackson.datatype.joda.JodaModule;


public class TestCamelCase {
  final static Logger logger = LoggerFactory.getLogger(TestBindAnnotations.class);
  private ObjectMapper om;
  
  @Before
  public void before() {
    om = new ObjectMapper();
    om.setPropertyNamingStrategy(PropertyNamingStrategy.CAMEL_CASE_TO_LOWER_CASE_WITH_UNDERSCORES);
    om.registerModule(new JodaModule());
  }
  
  class T1 {
    public String uId;
    public T1() {}
    public T1(String uId) { this.uId = uId; }
    public String toString() {
      return "T1 [uId=" + uId + "]";
    }
  }
  
  @Test
  public void testCaseNoGetter() throws IOException {
    T1 x = new T1("hello");
    String json = om.writeValueAsString(x);
    logger.info("json = " + json);
    Assert.assertEquals("{\"u_id\":\"hello\"}", json);
  }

  class T2 {
    private String uId;
    public T2() {}
    public T2(String uId) { this.uId = uId; }
    public String getUId() { return uId; }
    @Override
    public String toString() {
      return "T2 [uId=" + uId + "]";
    }
  }

  @Test
  public void testCaseGetter() throws IOException {
    T2 x = new T2("hello");
    String json = om.writeValueAsString(x);
    logger.info("json = " + json);
    Assert.assertEquals("{\"u_id\":\"hello\"}", json);
  }
}