columnservice.java

介绍关于JSP网站开发方面的内容,特别详尽

/*
 * Created on 2005-11-10
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
package com.mycompany.news.service;

import java.sql.Connection;
import java.util.ArrayList;
import java.util.List;

import com.mycompany.database.Database;
import com.mycompany.news.dao.ColumnDAO;
import com.mycompany.news.dao.NewsDAO;
import com.mycompany.news.dao.impl.ColumnDAOImpl;
import com.mycompany.news.dao.impl.NewsDAOImpl;
import com.mycompany.news.dto.Column;
import com.mycompany.news.dto.News;

/**
 * @author Administrator
 * 
 * TODO To change the template for this generated type comment go to Window -
 * Preferences - Java - Code Style - Code Templates
 */
public class ColumnService extends BaseService{
	private ColumnDAO columnDAO=new ColumnDAOImpl();

	private int count;

	public boolean addColumn(Column Column) {
		Connection connection = null;
		try {
			connection = Database.getConnection();
			columnDAO.setConnection(connection);
			columnDAO.addColumn(Column);
			Database.commit();
			return true;
		} catch (Exception e) {
			e.printStackTrace();
			message = e.getMessage();
			Database.rollback();
			return false;
		} finally {
			Database.releaseConnection(connection);
		}
	};//添加Column信息

	public boolean updateColumn(Column column) {
		Connection conn=null;
		try{
			conn = Database.getConnection();
			columnDAO.setConnection(conn);
			columnDAO.updateColumn(column);
			conn.commit();
			return true;
		}catch(Exception e){
			e.printStackTrace();
			message = e.getMessage();
			Database.rollback();
			return false;
		}finally{
			Database.releaseConnection(conn);
		}
		
	};//修改Column信息
//
	public boolean deleteColumn(Column column) {
		Connection connection = null;
		try {			
			connection = Database.getConnection();
			NewsDAO newsDAO = new NewsDAOImpl();
			newsDAO.setConnection(connection);
			News condition = new News();
			condition.setColumnId(column.getColumnId());
			List list = newsDAO.listNews(condition,1,100);
			if(list.size()>0){
				setMessage("本栏目已经存在新闻，不能删除");
				return false;
			}
			columnDAO.setConnection(connection);
			Column cCondition = new Column();
			cCondition.setParentColumn(column.getColumnId());
			List list2 = columnDAO.listColumns(cCondition,1,100);
			if(list2.size()>0){
				setMessage("本栏目已经存在子栏目，不能删除");
				return false;
			}
			columnDAO.deleteColumn(column);
			Database.commit();
			return true;
		} catch (Exception e) {
			e.printStackTrace();
			message = e.getMessage();
			Database.rollback();
			return false;
		} finally {
			Database.releaseConnection(connection);
		}	
	};//删除Column信息
//
	public List listAllColumns() {
		Connection connection = null;
		try {			
			connection = Database.getConnection();
			columnDAO.setConnection(connection);
			return columnDAO.listAllColumns();
		} catch (Exception e) {
			e.printStackTrace();
			message = e.getMessage();
			Database.rollback();
		} finally {
			Database.releaseConnection(connection);
		}				
		return new ArrayList();
	};//列出所有的Column信息
//
	public List listColumns(Column columnCondition,int pageNo,int pageSize) {
		Connection conn =null;
		try{
		conn = Database.getConnection();
		columnDAO.setConnection(conn);
		return columnDAO.listColumns(columnCondition,pageNo,pageSize);
		}catch(Exception e){
			e.printStackTrace();
			message = e.getMessage();
			return null;
		}finally{
		Database.releaseConnection(conn);	
		}			
	};//组合条件查询

	public Column getByID(long id) {
		Connection connection = null;
		try {
			connection = Database.getConnection();
			columnDAO.setConnection(connection);
			return columnDAO.getByID(id);
		} catch (Exception e) {
			e.printStackTrace();
			message = e.getMessage();
		} finally {
			Database.releaseConnection(connection);
		}
		return null;
		
	};//根据主键获取对象

	/**
	 * @param message
	 *            The message to set.
	 */

	/**
	 * @return Returns the ColumnDAO.
	 */
	public ColumnDAO getColumnDAO() {
		return columnDAO;
	}

	/**
	 * @param columnDAO
	 *            The ColumnDAO to set.
	 */
	public void setColumnDAO(ColumnDAO columnDAO) {
		this.columnDAO = columnDAO;
	}
	/**
	 * 取得root下的所有递归子节点
	 * @param root
	 * @return
	 */
	public List listSublings(Column root){
		Connection con = null;
		try{
		con=Database.getConnection();
		columnDAO.setConnection(con);
		Column columnCondition=new Column();
		columnCondition.setTopColumn(root.getColumnId());
		return columnDAO.listColumns(columnCondition,1,Integer.MAX_VALUE);
		}catch(Exception e){
			e.printStackTrace();
			message = e.getMessage();
			return new ArrayList();
		}finally{
			Database.releaseConnection(con);
		}
	}
	/**
	 * 取得parent下的直接子节点
	 * @param parent
	 * @return
	 */
	public List listChildren(Column parent){
		Connection con = null;
		try{
		con=Database.getConnection();
		columnDAO.setConnection(con);
		Column columnCondition=new Column();
		columnCondition.setParentColumn(parent.getColumnId());
		return columnDAO.listColumns(columnCondition,1,Integer.MAX_VALUE);
		}catch(Exception e){
			e.printStackTrace();
			message = e.getMessage();
			return new ArrayList();
		}finally{
			Database.releaseConnection(con);
		}
	}	
/**
 * 取得栏目树的字符串表示
 * @param root
 * @param treeList
 * @return
 */
	public StringBuffer getTreeString(String url,Column root, List treeList){
		StringBuffer strBuf = new StringBuffer();
		strBuf.
		append("['"+root.getColumnName()+"',").
		append("'"+url).
		append(root.getColumnId()).
		append("'");
		
		for(int i=0;i<treeList.size();i++){
			Column column = (Column) treeList.get(i);			
			if(column.getParentColumn().equals(root.getColumnId())){
				strBuf.append(",").append("\n");
				strBuf.append(getTreeString(url,column,treeList));					
			}
		}		
			strBuf.append("]");
			return strBuf;
	}
	public static void main(String[] args) {
		ColumnService cs = new ColumnService();
		List columns = new ArrayList();
		Column c0 = new Column();
		c0.setColumnId(new Long(1));
		c0.setParentColumn(new Long(0));
		c0.setColumnName("根");
		c0.setCurrentLevel(new Integer(0));
		
		columns.add(c0);
		Column c1 = new Column();
		c1.setColumnId(new Long(2));
		c1.setParentColumn(new Long(1));
		c1.setColumnName("根-叶节点1");
		c1.setCurrentLevel(new Integer(1));
		columns.add(c1);
		Column c2 = new Column();
		c2.setColumnId(new Long(3));
		c2.setParentColumn(new Long(1));
		c2.setColumnName("根-叶节点2");
		c2.setCurrentLevel(new Integer(1));
		columns.add(c2);
		StringBuffer buffer = cs.getTreeString("columns.jsp?columnid=",c0,columns);
		System.out.println(buffer);
	}

	/**
	 * @return Returns the count.
	 */
	public int getCount() {
		return count;
	}
	/**
	 * @param count The count to set.
	 */
	public void setCount(int count) {
		this.count = count;
	}
}