Struts2返回json格式数据代码实例

public class ProInfomaDao extends HibernateDaoSupport {
 private Logger logger = Logger.getLogger(ProInfomaDao.class);
　　/**
   * 查询所有数据
   * @return
   */
  @SuppressWarnings("unchecked")
  public List<BanknameDto> selBankList() {
    String sql = "SELECT DISTINCT ENAME FROM PM_PROINFO";　　　　　　　　　　　　//填写对应的SQL语句
    List<String> queryList = getSession().createSQLQuery(sql).list();
    List<BanknameDto> bankList = new ArrayList<BanknameDto>();
    queryList.add(0, "--请选择--");
    BanknameDto bankDto = null;
    if(queryList.size() == 0){
      logger.info("查不到相关信息！");
    }else{
      for(int i = 0;i < queryList.size();i++){
        bankDto = new BanknameDto();
        if(i == 0){
          bankDto.setId(String.valueOf(i+1));
          bankDto.setText(queryList.get(i));
          bankDto.setSelected("true");
        }else{
          bankDto.setId(String.valueOf(i+1));
          bankDto.setText(queryList.get(i));
        }
        bankList.add(bankDto);
      }
    }
    return bankList;　　　　　　　　　　　　　　　　　　　　//此处用到hibernate来查询数据，返回结果为一个[demo1,demo2,demo3]的List集合
  }
}

public class ProInfomaService {
  private ProInfomaDao proInfomaDao;
  public void setProInfomaDao(ProInfomaDao proInfomaDao) {
    this.proInfomaDao = proInfomaDao;
  }
  /**
   * 查询数据
   * @return
   */
  public List<BanknameDto> selBankList(){
    return proInfomaDao.selBankList();
  }
}

public class ProInfomaAction extends ActionSupport implements ServletRequestAware{
  private static final long serialVersionUID = 1L;
  private ProInfomaService proInfomaService;
  private Map<String, Object> resultMap = new HashMap<String, Object>();  
  private JSONObject dataroot;                　　
  private JSONArray bankroot;                  //此处要返回的属性名称，以bankroot为例，要与struts中
  private JSONArray projroot;                  //<param name="root">bankroot</param>且提供get set方法
  private HttpServletRequest request;

  /**
   * 查询银行名称
   * @return
   */
  public String selBankList() {
    List<BanknameDto> selBank = proInfomaService.selBankList();
    bankroot = JSONArray.fromObject(selBank);
    return SUCCESS;
  }

  public JSONArray getBankroot() {
    return bankroot;
  }

  public void setBankroot(JSONArray bankroot) {
    this.bankroot = bankroot;
  }
  @Override
  public void setServletRequest(HttpServletRequest request) {
    this.request = request;
  }
}

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
  <package name="proInfo" namespace="/" extends="json-default">
　　 <!--此处返回json只可以用json-default　result结果集可以改变返回参数的名称 -->
    <action name="query" class="noticeAction" method="selBankList">
      <result name="success" type="json">
      </result>
      <result name="returnMap" type="json">
        <param name="root">bankroot</param>　　　　　　　　　　　　　　
      </result>
    </action>
</struts>