通过使用集合Properties完成JDBC的连接工具类

1.将数据库连接对象所需参数保存在本地文件中

database.properties  

driverClass=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/mybase
username=root
password=123456

2.编写数据库连接工具类

package jdbcutil;

import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.util.Properties;

public class JDBCUtilsConfig {
private  static Connection con;
private static String driverClass;
private static String url;
private static String username;
private static String password;

static{
try{
readConfig();
Class.forName(driverClass);
con=DriverManager.getConnection(url,username,password);

}catch (Exception e){
throw new RuntimeException("数据库连接失败");
}
}
private static void readConfig()throws Exception{
InputStream in=JDBCUtilsConfig.class.getResourceAsStream("database.properties");
Properties pro=new Properties();
pro.load(in);
driverClass=pro.getProperty("driverClass");
url=pro.getProperty("url");
username=pro.getProperty("username");
password=pro.getProperty("password");
}
public static Connection getConnection(){
return con;
}
}