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，在需要序列化為json輸出的類上增加@JsonSerialize(include=JsonSerialize.Inclusion.NON_NULL)
//@JsonSerialize(include=JsonSerialize.Inclusion.NON_NULL)
public class ActTerminalResultParam extends BaseFacadeAmountDepositTradeParam
implements Serializable{
注意：在類上注入此標志時，返回此類時，會返回set屬性里的值