工作中用到了Extjs，从后台获取数据的时候，用到了extjs自己的Ext.data.store方法，然后封装了ExtGridReturn方法，
目的：前台用到Ext.data.store读取从后台传过来的数据，后台封装成ExtGridReturn类型
前台如下：
this.store = new Ext.data.Store({
remoteSort:true, baseParams:{ start:0, limit:this.pageSize }, proxy:new Ext.data.HttpProxy({ method:'POST', url:this.getAllUrl }), reader:new Ext.data.JsonReader({ totalProperty:'results', root:'rows' },['rulesId','rulesTitle','rulesContent','rulesType','updateUser',{ name:'updateTime', type:'date', dateFormat:'time' },'rulesAuthor','isTop',{ name:'createTime', type:'date', dateFormat:'time' }]) });当前的数据读取器是带有root和totalProperty的，所以，后台封装的类型如下：
package cn.edu.hbcf.common.vo;
import java.util.List;/** * Ext Grid返回对象 * * @author LiPenghui * */public class ExtGridReturn { /** * 记录总条数 */ private int results; private int otherCount; /** * 所有数据 */ private List<?> rows; public ExtGridReturn() { } public ExtGridReturn(int results, List<?> rows) { this.results = results; this.rows = rows; } public int getResults() { return results; } public void setResults(int results) { this.results = results; } public List<?> getRows() { return rows; } public void setRows(List<?> rows) { this.rows = rows; } public int getOtherCount() { return otherCount; } public void setOtherCount(int otherCount) { this.otherCount = otherCount; } }Controller中的方法就可以这样写啦：如下：@RequestMapping(value="/selectBaseRules",method=RequestMethod.POST)
@ResponseBody public Object selectBaseRules(ExtPager pager,int rulesType){ Criteria criteria = new Criteria(); if(pager.getStart() !=null &&pager.getLimit() !=null){ criteria.setStart(pager.getStart()); criteria.setLimit(pager.getLimit()); criteria.setOracleStart(pager.getStart()); criteria.setOracleEnd(pager.getStart() + pager.getLimit()); } try { criteria.put("rulesType", rulesType); List<BaseRules> list = baseRulesService.selectBaseRules(criteria); int total= baseRulesService.getTotalCount(); return new ExtGridReturn(total, list); } catch (Exception e) { e.printStackTrace(); return new ExceptionReturn(e); } }，mybatis中的xml配置文件如下：
<select id="selectBaseRules" resultMap="BaseRulesMap" parameterType="Criteria">
<include refid="common.Oracle_Pagination_Head" /> select t.rules_id rulesId, t.rules_title rulesTitle, t.rules_content rulesContent, t.rules_type rulesType, t.update_time updateTime, t.rules_author rulesAuthor, t.is_top isTop, t.create_time createTime, t.UPDATE_USER updateUser, s.account account, s.real_name realName, s.user_id userId from SMS_BASE_RULES t left join spauth.base_users s on s.user_id = t.update_user <where> t.rules_type=#{condition.rulesType,jdbcType=INTEGER} </where> <include refid="common.Oracle_Pagination_Tail" /></select>很简单的封装了Extjs读取的类型。