在用servlet做一个简单的项目时，一般数据库文件要么写在xml文件里要么写在java文件中，此次为了方便特意写在database.properties文件中。下面是项目路径和读取database.properties文件代码。

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.Locale;
import java.util.ResourceBundle;


public class DbHelper {

    static String user;
    static String password;
    static String url;

    static {
            try {
                ResourceBundle rb = ResourceBundle.getBundle("database",Locale.getDefault());
                user = rb.getString("user");
                password = rb.getString("password");
                url = rb.getString("url");

            } catch (Exception ex) {
                System.err.println("read resource error!");
            }
        }

    Connection connection = null;
    Statement statement = null;
    ResultSet rs = null;

    public DbHelper() {
        try {
            Class.forName("com.mysql.jdbc.Driver")
                    .newInstance();
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }

    public Connection getConnect() {
        try {
            this.connection = DriverManager.getConnection(url, user, password);
            this.statement = this.connection.createStatement(1005, 1008);
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("驱动类加载失败！");
            return null;
        }

        return this.connection;
    }

}