我们所使用的spring MVC框架的结构分为三层，control，service和dao层。其中，dao负责与数据库进行交互；service处理业务逻辑;control负责与页面交互。

我们的系统中，有很多表格展现的内容，其中表格还需要有查询数据、分页等页务逻辑。

我找到以前的代码，js向controller传参数是这样的：

                 function getQueryCondition() {var root = corporateManager.treeManager.data[0].id;if (root != 'root') {var start = new Date(Date.parse($("#startTime").val().substring(0, 10) + "T00:00:00"));var end = new Date(Date.parse($("#endTime").val().substring(0, 10) + "T23:59:59"));if (Math.floor((end - start) / (1000 * 60 * 60 * 24) + 1) > 7) {$.ligerDialog.error("查询时间间隔不能大于7天！");return;}}var serviceInfo = {"code": $("#code").val(),"name": $("#name").val(),"mustQueryPerson": "true","corporate": getCorporateSelect(),"startTime": $("#startTime").val() + " 00:00:00","endTime": $("#endTime").val() + " 23:59:59","backTime": $("#backTime").val(),"attendanceState": $("#attendanceState").val(),"pagesize": recordGridManager.get("pageSize"),"queryType": "attendance","dormId": $("#dormID").val()};return serviceInfo;}

在controller里面接收到参数是这样的，其中还要进行非空的验证判断，分页数据的处理等。

                   String startTime = request.getParameter("startTime");String endTime = request.getParameter("endTime");String person = request.getParameter("personID");backTime = request.getParameter("backTime");int pageno = Integer.valueOf(request.getParameter("page") == null ? "1" : request.getParameter("page"));String[] pageSizeArr = map.get("pagesize");String attendanceState = request.getParameter("attendanceState");String dormId = request.getParameter("dormId");int pageSize = Integer.valueOf(pageSizeArr == null ? "10" : (pageSizeArr.length > 1 ? pageSizeArr[1] : pageSizeArr[0]));//获取到人员实体集合String code = request.getParameter("code");String name = request.getParameter("name");String corporate = request.getParameter("corporate");

这样调用service中的方法

                  personObjectList = service.getNoswingPerson(corporateList, name, code, sdfT.parse(backTime).getTime(), attendanceState, sdf.parse(startTime).getTime(), sdf.parse(endTime).getTime(), dormId, (pageno - 1) * pageSize, pageSize,dayLong);

在service中又进行了一次处理,然后传给dao层。

                   HashMap hm = new HashMap();StringBuffer deptSb = new StringBuffer();if (deptID != null && deptID.size() > 0) {deptSb.append("(");for (Object ob : deptID) {deptSb.append("'").append(ob.toString()).append("'").append(",");}deptSb.deleteCharAt(deptSb.length() - 1);deptSb.append(")");}hm.put("time1", time + RIGHT_TIME);hm.put("state", state);hm.put("startTime", startTime);hm.put("endTime", endTime);hm.put("deptIDList", deptSb.length() == 0 ? null : deptSb.toString());hm.put("personName", personName.equals("") ? null : "%" + personName + "%");hm.put("dormId", "".equals(dormId) ? null : dormId);hm.put("personCode", personCode.equals("") ? null : "%" + personCode + "%");hm.put("days", days);hm.put("start", start);hm.put("size", size);return dao.getNoswingPerson(hm);

dao中怎么使用就省略了。可以看到，其实controller和service层其实进行处理了两次，而且由于存在讨厌的空指针异常，还判断了两次空……

so urgly!

我把需要的条件封装到两个bean中，其中基类包括分页等通用的处理，导出类中包含一些个性化的设置，并进行了空指针异常判断的处理等内容。

                public class BaseCondition {private int start = 0;private int size = 0;private int page = 1;private int pageSize = 10;private String sortName="";private String sortOrder="DESC";public String getSortName() {return sortName;}public void setSortName(String sortName) {if(sortName==null) return;this.sortName = sortName;}public String getSortOrder() {return sortOrder;}public void setSortOrder(String sortOrder) {if(sortOrder==null) return;this.sortOrder = sortOrder;}public void setPage(int page){this.page = page;}public int getPage(){return this.page;}public void setPageSize(int pageSize){this.pageSize = pageSize;}public int getStart() {if(start == 0){return (page - 1) * pageSize;}return start;}public void setStart(int start) {this.start = start;}public int getSize() {if(size == 0) {return pageSize;}return size;}public void setSize(int size) {this.size = size;}}public class Condition extends BaseCondition{private long startTime;private long endTime;private String isPresidium = "0";private String representativeType="";private String monitorId="";private String signWay="";                    private String cmId="";private int isSignInOut=0;private int total = 0;private int statisType = 0;private static SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");public void setStartTimeStr(String startTimeStr){try{this.startTime = sdf.parse(startTimeStr).getTime();}   catch(Exception e){this.startTime = 0;}     }public void setEndTimeStr(String endTimeStr){try{this.endTime = sdf.parse(endTimeStr).getTime();}   catch(Exception e){this.endTime = 0;}     }                   public long getStartTime() {return startTime;}public void setStartTime(long startTime) {this.startTime = startTime;}public long getEndTime() {return endTime;}public void setEndTime(long endTime) {this.endTime = endTime;}                  public String getIsPresidium() {return isPresidium;}public void setIsPresidium(String isPresidium) {if(isPresidium==null) return;this.isPresidium = isPresidium;}public String getRepresentativeType() {return representativeType;}public void setRepresentativeType(String representativeType) {if(representativeType==null) return;this.representativeType = representativeType;}public String getMonitorId() {return monitorId;}public void setMonitorId(String monitorId) {if(monitorId==null) return;this.monitorId = monitorId;}public String getSignWay() {return signWay;}public void setSignWay(String signWay) {if(signWay==null) return;this.signWay = signWay;}public String getCmId() {return cmId;}public void setCmId(String cmId) {if(cmId==null) return;this.cmId = cmId;}public int getTotal() {return total;}public void setTotal(int total) {this.total = total;}public int getStatisType() {return statisType;}public void setStatisType(int statisType) {this.statisType = statisType;}public int getIsSignInOut() {return isSignInOut;}public void setIsSignInOut(int isSignInOut) {this.isSignInOut = isSignInOut;}   public String getDirection() {if(isSignInOut ==0){return "('10','20')";}else{return "('10')";}}public String getStatisTypeCondition(){if(statisType == 1){return "direction in " + getDirection();}if(statisType == 2){return "(direction not in " + getDirection() +" or direction is null)";}return " 1= 1 ";}}

由于采用了spring框架， 我们的controller只需要这样传入实体就可以了

              @RequestMapping(params = "method=getAttendStatis")public @ResponseBodyString getAttendStatis(Condition condition) {……}

而service也只需下传给dao就可以了，当然，如果需要处理数据，在这里处理一下

             public List<allpersoninfo> getDetailList(Condition condion){List<allpersoninfo> list = meetingControlManagerDao.getDetailList(condion);if(list == null){return new ArrayList<allpersoninfo>();}return list;}</allpersoninfo></allpersoninfo></allpersoninfo>