@JsonSerialize(include=JsonSerialize.Inclusion.NON_NULL)

一：

  response.setContentType("text/html;charset=utf-8");

  ObjectMapper mapper=new ObjectMapper();

  JsonFactory factory=mapper.getJsonFactory();

  JsonGenerator jsonGenerator=factory.createJsonGenerator(response.getOutputStream());

  Map map=new HashMap();

  map.put("result", "1");

  jsonGenerator.writeObject(map);

二：JsonObject json=new JsonObject();

        json=JsonObject.fromJsonObject(object);

      response.setContentType("text/html;charset=utf-8");

      response.getWriter().write(json);

 

三：

spring MVC 3.X 支持注解，在需要序列化为json输出的类上增加@JsonSerialize(include=JsonSerialize.Inclusion.NON_NULL)

//@JsonSerialize(include=JsonSerialize.Inclusion.NON_NULL)

public class ActTerminalResultParam extends BaseFacadeAmountDepositTradeParam

implements Serializable{

 

注意：在类上注入此标志时，返回此类时，会返回set属性里的值