package com.amaker.util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Properties;
/**
*
* @author hz.guo
*数据库工具类
*/
public class DBUtil {
/*
* 关闭数据库连接
*/
public void closeConn(Connection conn){
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
/*
* 打开数据库连接
*/
public Connection openConnection() {
Properties prop = new Properties();
String driver = null;
String url = null;
String username = null;
String password = null;
try {
prop.load(this.getClass().getClassLoader().getResourceAsStream(
"DBConfig.properties"));
driver = prop.getProperty("driver");
url = prop.getProperty("url");
username = prop.getProperty("username");
password = prop.getProperty("password");
Class.forName(driver);
return DriverManager.getConnection(url, username, password);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}

。。
全是null

改成pass through