JavaWeb工具类

package org.edu.utils;

import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Properties;


public class BaseDao {
    
    
private Connection connection=null;
	
	private PreparedStatement ps=null;
	
	private ResultSet rs=null;
	
	private static String driver;
	
	private static String url;
	
	private static String username;
	
	private static String password;
	
	
	
	static{
    
    
		initial();
	}
	
	public static void initial(){
    
    
		Properties properties=new Properties();
		InputStream is=BaseDao.class.getClassLoader().getResourceAsStream("database.properties");
		try {
    
    
			properties.load(is);
			
		} catch (IOException e) {
    
    
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		driver=properties.getProperty("driver");
		url=properties.getProperty("url");
		username=properties.getProperty("username");
		password=properties.getProperty("password");
		
	}
	
	public boolean getConnection(){
    
    
		
		try {
    
    
			Class.forName(driver);
			connection=DriverManager.getConnection(url,username,password);
		} catch (ClassNotFoundException e) {
    
    
			// TODO Auto-generated catch block
			e.printStackTrace();
			return false;
		} catch (SQLException e) {
    
    
			// TODO Auto-generated catch block
			e.printStackTrace();
			return false;
		}
		return true;
		
	}
	
	
	public void closeAll(Connection connection,PreparedStatement ps,ResultSet rs){
    
    
		if(rs!=null){
    
    
			try {
    
    
				rs.close();
			} catch (SQLException e) {
    
    
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		if(ps!=null){
    
    
			try {
    
    
				ps.close();
			} catch (SQLException e) {
    
    
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		if(connection!=null){
    
    
			try {
    
    
				connection.close();
			} catch (SQLException e) {
    
    
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
	
	
	
	public int executeUpdate(String sql,Object[] params){
    
    
		int count=0;
		if(this.getConnection()){
    
    
			try {
    
    
				ps=connection.prepareStatement(sql);
				for(int i=0;i<params.length;i++){
    
    
					ps.setObject(i+1, params[i]);
				}
				count=ps.executeUpdate();
			} catch (SQLException e) {
    
    
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			
		}
		return count;
	}
	
	public ResultSet executeSQL(String sql,Object[] params){
    
    
		if(this.getConnection()){
    
    
			try {
    
    
				ps=connection.prepareStatement(sql);
				for(int i=0;i<params.length;i++){
    
    
					ps.setObject(i+1, params[i]);
				}
				rs=ps.executeQuery();
			} catch (SQLException e) {
    
    
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			
		}
		return rs;
	}
	
}