Struts2 接收 DataTables 服务端处理参数以及简单的分页模型

后端使用struts2的时候,Datatables使用服务端处理的话，怎么处理自动发送的参数呢？

结合实际开发,弄了一个比较简单易用的处理方法,仅适用于不是特别复杂的场景,另外附上分页模型。

Datatables版本为1.10.0

struts2获取DT发送参数的工具类,可在action中调用

/*
 * 获取DT发送的参数
 * 
 */
public static Map<String,Object> getDTParameters(){
	Map<String,Object> returnMap = new HashMap<String,Object>();		
	//排序的那一列位置
	String orderColumnNum = ServletActionContext.getRequest().getParameter("order[0][column]");
	//排序方式 asc或者desc
	String orderType = ServletActionContext.getRequest().getParameter("order[0][dir]");
	//全局搜索条件
	String searchValue = ServletActionContext.getRequest().getParameter("search[value]");
	//需要排序的那一列属性名称
	String orderDataName = ServletActionContext.getRequest().getParameter("columns["+orderColumnNum+"][data]");
	//获取当前所有的展示字段
	Map<String, String[]> params = ServletActionContext.getRequest().getParameterMap();
	List<String> dataParams = new ArrayList<String>();
	for(Map.Entry<String, String[]> entry:params.entrySet()){
		if(entry.getKey().indexOf("][data]")!=-1){
			String a = (params.get(entry.getKey()))[0];
			if(!a.equals("")){
				dataParams.add(a);
			}
		}
	}
	returnMap.put("orderDataName", orderDataName);
	returnMap.put("orderType", orderType);
	returnMap.put("searchValue", searchValue);
	returnMap.put("dataParams", dataParams);
	return returnMap;
}

Action 中对应的 list 方法

备注:此为BaseAction中的方法,如果你没有ActionBase类把T改成对应实体类型就行了

/**
* 通用 list方法
* 分页展示对应实体的集合
* @return
*/
public String list(){
Map<String,Object>  dt = StrutsUtils.getDTParameters();
PageModel<T> pu = baseService.findByPager(start, length,(String)dt.get("orderDataName"),(String)dt.get("orderType"),(String)dt.get("searchValue"),(List<String>)dt.get("dataParams"));
jsonMap.put("draw", draw);
jsonMap.put("data", pu.getDatas());
jsonMap.put("recordsTotal", pu.getRecordCount());
if(!((String)dt.get("searchValue")).equals("")){
jsonMap.put("recordsFiltered", pu.getDatas().size());
}else{
jsonMap.put("recordsFiltered", pu.getRecordCount());
}
jsonMap.put("returnCode", 0);
return SUCCESS;
}

备注:同样为BaseDao,ORM框架为Hibernate

public PageModel<T> findByPager(int dataNo, int pageSize,String orderDataName,String orderType,String searchValue,List<String> dataParams) {
// TODO Auto-generated method stub
PageModel<T> pm=new PageModel<T>(orderDataName, orderType,searchValue,dataParams,dataNo,pageSize);

String hql="from "+clazz.getSimpleName();

//增加搜索条件
if(searchValue!=""){
	hql+=" where ";
	int i = 1;
	for(String s:dataParams){
		hql+=s+" like '%" + searchValue + "%'";
		i++;
		if(i<=dataParams.size()){
			hql+=" or ";
		}
	}
	
}

//增加排序
if(orderDataName!=""){
	hql += " order by " + orderDataName + " " + orderType;
}



pm.setDatas(getSession().createQuery(hql).setFirstResult(dataNo).setMaxResults(pageSize).setCacheable(true).list());
pm.setRecordCount(totalCount());
return pm;
}

分页模型PageModel<T>

/**
 * 
 */
package com.dcits.business.base.bean;
import java.util.ArrayList;

import java.util.List;
/**


@author xuwangcheng


分页模型

*/

public class PageModel<T> {
//当前需要排序的列名称

private String orderDataName;

//排序方式,默认 asc

private String orderType = "asc";

//全局搜索条件

private String searchValue = "";

//当前展示的字段名

private List<String> dataParams = new ArrayList<String>();

//当前起始数据的位置

private int dataNo=0;

//每页显示的记录数

private int pageSize=10;

//总记录数

private int recordCount;

//总页数

private int pageCount;

//存放分页数据的集合

private List<T> datas;
public PageModel(){
}
public PageModel(String orderDataName, String orderType,

String searchValue, List<String> dataParams, int dataNo,

int pageSize) {

super();

this.orderDataName = orderDataName;

this.orderType = orderType;

this.searchValue = searchValue;

this.dataParams = dataParams;

this.dataNo = dataNo;

this.pageSize = pageSize;

}
public List<String> getDataParams() {

return dataParams;

}
public void setDataParams(List<String> dataParams) {

this.dataParams = dataParams;

}
public String getOrderDataName() {

return orderDataName;

}
public void setOrderDataName(String orderDataName) {

this.orderDataName = orderDataName;

}
public String getOrderType() {

return orderType;

}
public void setOrderType(String orderType) {

this.orderType = orderType;

}
public String getSearchValue() {

return searchValue;

}
public void setSearchValue(String searchValue) {

this.searchValue = searchValue;

}
public int getDataNo() {

return dataNo;

}
public void setDataNo(int dataNo) {

this.dataNo = dataNo;

}
public int getPageSize() {

return pageSize;

}
public void setPageSize(int pageSize) {

this.pageSize = pageSize;

}
public int getRecordCount() {

return recordCount;

}
public void setRecordCount(int recordCount) {

this.recordCount = recordCount;

}
public int getPageCount() {

if(this.getRecordCount()<=0){

return 0;

}else{

pageCount=(recordCount+pageSize-1)/pageSize;

}

return pageCount;

}
public void setPageCount(int pageCount) {

this.pageCount = pageCount;

}
public List<T> getDatas() {

return datas;

}
public void setDatas(List<T> datas) {

this.datas = datas;

}


}

本人为Java新手,如有错误,欢迎指出并一起讨论!