jdbc 数据库配置util 及 Properties 设置方法

package util;

import java.io.InputStream;

import java.sql.Connection;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

import java.util.Properties;

import javax.sql.DataSource;

import org.apache.commons.dbcp.BasicDataSourceFactory;

public class DBUtil {

private static DataSource dataSource;

static{
//在类加载时，对dataSource进行初始化（实现连接池）
//获取到配置文件的输入流
InputStream is = DBUtil.class.getClassLoader().getResourceAsStream("db.properties");
//创建一个properties对象，用来加载配置文件
Properties pro = new Properties();
try {
//将配置文件，加载入pro
pro.load(is);
//通过工厂，获取一个连接池的dataSource
dataSource = BasicDataSourceFactory.createDataSource(pro);
} catch (Exception e) {
e.printStackTrace();
}
}

public static Connection getConnection(){
try {
//通过连接池，获取一个链接对象
return dataSource.getConnection();
} catch (SQLException e) {
e.printStackTrace();
}
return null;
}
public static void close(Connection conn,Statement state,ResultSet result){
if(result!=null){
try {
result.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.prin
4000
tStackTrace();
}
result=null;
}
if(state!=null){
try {
state.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
state=null;
}
if(conn!=null){
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
conn =null;
}

}

}

properites配置文件

jdbc.url=jdbc:oracle:thin:@localhost:1521/xe

jdbc.user=system

jdbc.password=123456

jdbc.driverClass=oracle.jdbc.driver.OracleDriver

jdbc.initSize=20