pagingserviceimpl.java

一个JAVA分页解决方案

package com.ctic.core.prod.common;

import java.lang.reflect.Method;
import java.util.List;
import java.util.Map;

import com.ctic.core.pub.common.PagingUtils;
import com.ctic.core.server.pub.InstanceFactory;

/**
 * 分页服务，用于获得分页相关的信息
 * 
 * @author Tu_Minglei
 */
public class PagingServiceImpl implements IPagingService {

	public int getTotalRecordCount(Map<String, Object> queryRequestMap) {
		if(queryRequestMap == null) throw new RuntimeException("userRequestMap is NULL!");
		try {
			Object service = InstanceFactory.getService((Integer) queryRequestMap.get("userModuleId"), 
					(String) queryRequestMap.get("userServiceId"));
			Method method = service.getClass().getDeclaredMethod((String) queryRequestMap.get("userMethodName"),
					(Class[]) queryRequestMap.get("userParamTypes"));		
			// 重置分页相关的参数值，以便取得所有记录
			if(queryRequestMap.get("userParamObjects") != null){
				for(Object obj : (Object[])queryRequestMap.get("userParamObjects")) PagingUtils.resetPagingParams(obj);
			}
			//
			Object qResult = method.invoke(service, (Object[])queryRequestMap.get("userParamObjects"));	
			//
			return (qResult instanceof List) ? ((List)qResult).size() : 0;
			
		} catch (Exception e) {
			throw new RuntimeException(e);
		} 
	}
	
}