jquery datatables 插件 后台代码

package page;

import java.util.Map;

public class Column {
	private Object data;
	private Object name;
	private Object searchable;
	private Object orderable;
	private Map<String,Object> search;
	public Object getData() {
		return data;
	}
	public void setData(Object data) {
		this.data = data;
	}
	public Object getName() {
		return name;
	}
	public void setName(Object name) {
		this.name = name;
	}
	public Object getSearchable() {
		return searchable;
	}
	public void setSearchable(Object searchable) {
		this.searchable = searchable;
	}
	public Object getOrderable() {
		return orderable;
	}
	public void setOrderable(Object orderable) {
		this.orderable = orderable;
	}
	public Map<String, Object> getSearch() {
		return search;
	}
	public void setSearch(Map<String, Object> search) {
		this.search = search;
	}
	
	
}

  

PageCondition.java

package page;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

public class PageCondition {
	private final String[] rules={"draw","start","length","search","order","columns"};
	private JSONObject jsonObj;
	
	public PageCondition(JSONObject jsonObj){
		this.jsonObj=jsonObj;
	}
	public int draw(){
		if(containKey("draw")){
			return getInt("draw");
		}
		throw new IllegalArgumentException("没有order");
	}
	
	
	public int start(){
		if(containKey("start")){
			return getInt("start");
		}
		throw new IllegalArgumentException("没有start");
	}
	
	public int length(){
		if(containKey("length")){
			return getInt("length");
		}
		throw new IllegalArgumentException("没有length");
	}
	
	public Map<String,String> search(){
		if(containKey("search")){
			return getMap("search");
		}
		throw new IllegalArgumentException("没有search");
	}
	
	
	public List<Map<String,String>> order(){
		List<Map<String,String>> list=new ArrayList<Map<String,String>>();
		if(containKey("order")){
			JSONArray jsonArray=jsonObj.getJSONArray("order");
			for(int i=0;i<jsonArray.size();i++){
				JSONObject dataObject=jsonArray.getJSONObject(i);
				list.add(getMap(dataObject));
			}
			return list;
		}
		throw new IllegalArgumentException("没有order");
	}
	
	public List<Column> columns(){
		List<Column> list=new ArrayList<Column>();
		if(containKey("columns")){
			JSONArray jsonArray=jsonObj.getJSONArray("columns");
			for(int i=0;i<jsonArray.size();i++){
				JSONObject dataObject=jsonArray.getJSONObject(i);
				Column columnData=(Column)JSONObject.toBean(dataObject,Column.class);
				list.add(columnData);
			}
			return list;
		}
		throw new IllegalArgumentException("没有columns");
	}
	
	public Map<String,String> outSearch(){
		Set<String> keys=jsonObj.keySet();
		Set<String> keyCopy=new HashSet<String>();
		keyCopy.addAll(keys);
		keyCopy.removeAll(Arrays.asList(rules));
		Iterator<String> i=keyCopy.iterator();
		Map<String,String> hashMap=new HashMap<String,String>();
		while(i.hasNext()){
			String key=i.next();
			String value=jsonObj.getString(key);
			hashMap.put(key, value);
		}
		return hashMap;
	}
	
	public boolean serverSide(){
		if(jsonObj.isEmpty())
			return false;
		return true;
	}
	//////////////////////
	private int getInt(String target){
		return jsonObj.getInt(target);
	}
	
	private Map<String,String> getMap(String target){
		JSONObject jsonMap=jsonObj.getJSONObject(target);
		return getMap(jsonMap);
	}
	private Map<String,String> getMap(JSONObject jsonMap){
		Map<String,String> map=new HashMap<String,String>();
		Iterator<String> iterator=jsonMap.keys();
		while(iterator.hasNext()){
			String key=iterator.next();
			String value=jsonMap.getString(key);
			map.put(key, value);
		}
		return map;
	}
	
	
	private boolean containKey(Object key){
		if(jsonObj.containsKey(key)){
			return true;
		}
		return false;
	}
}

 PageFilter.java

 

package page;

import java.util.Map;

public interface PageFilter {
	public String execute(String hsql,Map<String,String> parameters,PageCondition condition);
}

 

PageResult.java

 

package page;

import java.util.List;

public class PageResult<T> {
	public int draw;
	public int recordsTotal;
	public int recordsFiltered;
	public List<T> data;
	public int getDraw() {
		return draw;
	}
	public void setDraw(int draw) {
		this.draw = draw;
	}
	public int getRecordsTotal() {
		return recordsTotal;
	}
	public void setRecordsTotal(int recordsTotal) {
		this.recordsTotal = recordsTotal;
	}
	public int getRecordsFiltered() {
		return recordsFiltered;
	}
	public void setRecordsFiltered(int recordsFiltered) {
		this.recordsFiltered = recordsFiltered;
	}
	public List<T> getData() {
		return data;
	}
	public void setData(List<T> data) {
		this.data = data;
	}
	
}

 XXXController.java controller层 使用 springmvc

package page;

import net.sf.json.JSONObject;

public class XXXController {
	@RequestMapping(value="/XXXXXXX")
	@ResponseBody
	public PageResult<RtnClass> doRequest(@RequestBody JSONObject jsonObj){
		PageCondition condition=new PageCondition(jsonObj);
		PageResult<RtnClass> result=XXXservice.doService(condition);
	}
}

 XXXService.java service层代码

package page;

import java.util.Map;

import net.sf.json.JSONObject;

public class XXXService {
	public void doService(PageCondition condition){
		String hsql="select t from RtnClass t where 1=1 ";
		String hsqlCount="select count(*) from RtnClass t where 1=1";
		PageFilter filter=new PageFilter(){

			@Override
			public String execute(String hsql, Map<String, String> parameters,
					PageCondition condition) {
				if(StringUtils.hasText(parameters.get("param"))){
					hsql+=" and t.param = "+parameters.get("param");
				}
				
				return hsql;
			}
		};
		
	}
}

 XXXDao.java dao层代码 用的是hibernate

package page;

import java.util.List;
import java.util.Map;

import javax.management.Query;

import org.apache.commons.lang.StringUtils;

public class XXXDao {
	public int queryRecordsTotal(String hsql,PageCondition condition){
		Query query=getSession().createQuery(hsql);
		return ((Number)query.uniqueResult()).intValue();
	}
	public int queryRecordsFiltered(String hsql,PageCondition condition,PageFilter filter){
		Map<String,String> parameters=condition.outSearch();
		hsql=filter.execute(hsql, parameters, condition);
		Query query=getSession().createQuery(hsql);
		return ((Number)query.uniqueResult()).intValue();
	}
	public <T> List<T> queryPage(String hsql,PageCondition condition){
		Query query=getSession().createQuery(hsql);
		int start=condition.start();
		int length=condition.length();
		query.setFisrtResult(start);
		query.setMaxResults(length);
		return query.list();
	}
	public <T> PageResult<T> queryForPage(String hsql,String hsqlCount,PageCondition condition,PageFilter filter){
		PageResult<T> result=new PageResult<T>();
		result.setDraw(condition.draw());
		int recordsTotal=queryRecordsTotal(hsqlCount,condition);
		int recordsFiltered=queryRecordsFiltered(hsqlCount,condition,filter);
		result.setRecordsTotal(recordsTotal);
		result.setRecordsFiltered(recordsFiltered);
		
		//filter
		Map<String,String> parameters=condition.outSearch();
		hsql=filter.execute(hsqlCount, parameters, condition);
		
		//order 
		StringBuilder orderSb=new StringBuilder(" order by");
		List<Map<String,String>> order=condition.order();
		for(Map<String,String> orderMap:order){
			String column=orderMap.get("column");
			String dir=orderMap.get("dir");
			int columnNum=Integer.parseInt(column);
			String name=condition.columns().get(columnNum).getName().toString();
			if(StringUtils.isNotEmpty(name)){
				orderSb.append(" "+name+" "+dir+" , " );
			}
		}
		String orderStr=orderSb.toString();
		if(orderStr.equals(" order by")){
			orderStr="";
		}else{
			orderStr=orderStr.substring(0,orderStr.lastIndexOf(","));
		}
		hsql+=orderStr;
		
		//page
		List<T> data=queryPage(hsql,condition);
		result.setData(data);
		
		return result;
	}
}

 jsonobjct jar包可以在附件中下载，代码仅供参考