Struts2返回json格式数据代码实例
最近由于工作原因,没时间更新,开始吧~~
关于json的返回需要用到一个工具包来将书转换为json格式,在此用到的jar包为:
import net.sf.json.JSONArray; //将数据转换为JSON数组
import net.sf.json.JSONObject; //将数据转换为JSON对象
dao层的代码
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 } }
service层代码
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(); } }
web层
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; } }
struts2中action的配置
<?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>
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