Jquery datatable backend wraps the data sample code
- 2020-03-30 03:38:46
- OfStack
1. Data conversion class
public class DataTableReturnObject {
private int iTotalRecords;
private int iTotalDisplayRecords;
private String sEcho;
private String[][] aaData;
public DataTableReturnObject(int totalRecords, int totalDisplayRecords, String echo, String[][] d) {
this.setiTotalRecords(totalRecords);
this.setiTotalDisplayRecords(totalDisplayRecords);
this.setsEcho(echo);
this.setAaData(d);
}
public void setiTotalRecords(int iTotalRecords) {
this.iTotalRecords = iTotalRecords;
}
public int getiTotalRecords() {
return iTotalRecords;
}
public void setiTotalDisplayRecords(int iTotalDisplayRecords) {
this.iTotalDisplayRecords = iTotalDisplayRecords;
}
public int getiTotalDisplayRecords() {
return iTotalDisplayRecords;
}
public void setsEcho(String sEcho) {
this.sEcho = sEcho;
}
public String getsEcho() {
return sEcho;
}
public void setAaData(String[][] aaData) {
this.aaData = aaData;
}
public String[][] getAaData() {
return aaData;
}
}
2 to help class
public class BaseController {
protected JSONResponse successed(Object obj) {
JSONResponse ret = new JSONResponse();
ret.setSuccessed(true);
ret.setReturnObject(obj);
return ret;
}
}
3. The implementation class
public JSONResponse searchList(HttpServletRequest request , HttpServletResponse response ,String sEcho) throws Exception {
//ConvertToMap, defined in the parent class, adds all the elements in the parameter array to a HashMap
Map<Object, Object> objQueryMap = new HashMap<Object, Object>();
String jsondata = request.getParameter("aoData");
JSONArray jsonarray = JSONArray.fromObject(jsondata);
String strDisplayStart ="";
String strDisplayLength="";
String[] arrayColumen = new String[new JSONUser().toArray().length];
int strSortId = 0;
String strSort = "";
for(int i=0;i<jsonarray.size();i++) //Select the parameter to be used from the pass parameter
{
JSONObject obj=(JSONObject)jsonarray.get(i);
String strName = (String)obj.get("name");
String strValue = obj.get("value").toString();
if(strName.equals("sEcho")){
sEcho=strValue;
}
if(strName.equals("iDisplayStart")) {
strDisplayStart=strValue;
}
if(strName.equals("iDisplayLength")) {
strDisplayLength=strValue;
}
if(strName.equals("sColumns")){
arrayColumen = obj.get("value").toString().split(",");
}
if(strName.startsWith("iSortCol_")){
strSortId = Integer.parseInt(strValue) ;//Row of the sequence number
}
if(strName.startsWith("sSortDir_")){
strSort = strValue;//Sort in the direction of "desc" or "asc".
}
}
Map<Object, Object> params = new HashMap<Object, Object>() ;
try {
params = managerService.getUserList( parameter );
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
String count = (String)params.get("COUNT");// The total number of
String[][] strData = (String[][])params.get("AO_DATA");//The collection displayed on the current page
return successed(new DataTableReturnObject(Integer.parseInt(count) , Integer.parseInt(count), sEcho, strData));
}
4. Query method
public Map<Object, Object> getUserList(Map<Object, Object> queryParams)
throws Exception {
String iCount = The total number of records ;
//Converts the query results to a two-dimensional array
String[][] data = {};
if (lstUser != null && lstUser.size() > 0) {
int record = lstUser.size();
data = new String[record][];
for (int i = 0; i < lstUser.size(); i++) {
User objUser = (User) lstUser.get(i);
JSONUser jsonUser = new JSONUser();
BeanUtils.copyProperties(jsonUser, objUser);
data[i] = jsonUser.toArray();
}
}
queryParams.clear();//Case map, reset the value to use
queryParams.put("AO_DATA", data);
queryParams.put("COUNT", iCount);
return queryParams;
}
Note that the array objects must have the same number of properties as the columns displayed on the front page