<package name="emp" extends="json-default">

		<action name="fetchEmps" class="empAction" method="fetchEmps">

			<result name="success" type="json">

				<param name="ignoreHierarchy">false</param>

				<param name="root">pagination</param>

			</result>

		</action>

            </package

有一个action是这么配置的,success的result返回json数据,action中的相应方法fetchEmps是这样的

public String fetchEmps(){

    int count = this.empService.countAll();

    this.pagination = new Pagination(this.page, Integer.valueOf(count), this.limit.intValue());

    List ps = this.empService.listAll(this.pagination.getPage().intValue(), this.pagination.getPageSize());

    this.pagination.setDatas(ps);

    return "success";

  }

我的疑惑是Struts2是怎么判断把哪个对象当做json数据返回的,方法里也没有显示把某个要返回的对象放入域啊,相应的action代码为:

import xxxxxxxx;

@Controller("empAction")

@Scope("prototype")

public class EmpAction extends BaseAction

{

  private static final long serialVersionUID = 1L;

  private IEmpService empService;

  private String newEmp;

  private String userName;

  private boolean exists;



  @Autowired

  @Required

  public void setEmpService(IEmpService empService)

  {

    this.empService = empService;

  }



  @JSON(serialize=false)

  public IEmpService getEmpService() {

    return this.empService;

  }



  public String fetchEmps()

  {

    int count = this.empService.countAll();

    this.pagination = new Pagination(this.page, Integer.valueOf(count), this.limit.intValue());

    List ps = this.empService.listAll(this.pagination.getPage().intValue(), this.pagination.getPageSize());

    this.pagination.setDatas(ps);

    return "success";

  }