[code="java"]
public class User {
private int id;
private String name;
private Date date;
}
User u = new User();
u.setId(1);
u.setName("张三");
u.setDate(new Date());
//结果{"id":1,"name":"张三","date":"2013-03-19"}
//如果u.setDate(null); 我不想让他参与序列化
// 我想返回{"id":1,"name":"张三"} 默认情况是{"id":1,"name":"张三","date":null}
[/code]
Jackson