17 添加一个properties配置文件

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src下写db.properties 注意没有空格，没有分号

url=jdbc:mysql://localhost/paper
user=root
password=123456
driverClass=com.mysql.jdbc.Driver

DBUtils.java

public class DBUtils {
	private static String url=null;
	private static String user=null;
	private static String password=null;
	private static String driverClass=null;
	
	static{
		try {
			//使用ResourceBundle取数据
			ResourceBundle rb=ResourceBundle.getBundle("db");
			url=rb.getString("url");
			user=rb.getString("user");
			password=rb.getString("password");
			driverClass=rb.getString("driverClass");
			Class.forName(driverClass);
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}