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HomeDatabaseMysql TutorialBAE百度云平台的mysql数据库的施用(Java)

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BAE百度云平台的mysql数据库的使用(Java)

BAE的数据库使用的mysql,还有phpmyadmin,怎么说呢,太像那种php空间了。

不过都是免费的哈~~

第一个问题就是连接数据的问题。

做了一个简单的聊天室项目,打算放上去试试。

BAE的数据库连接的用户名和密码需要从request请求中获取。

只有数据库名是我们可以直接拿来用的。

定义一个JdbcUtil类。用来获取连接。

为了节省代码,直接写成 共有静态变量了。

public final class JdbcUtil { 	private static String dbUrl = "jdbc:mysql://";	public static String port;	public static String host;	public static String username;	public static String password;	public static String databaseName = "zJtjKTokkLUoGqQZMBkC";	//拒绝new一个实例	private JdbcUtil() {};	static {//注册驱动		try {			Class.forName("com.mysql.jdbc.Driver");		} catch (ClassNotFoundException e) {			throw new ExceptionInInitializerError(e);		}	}	public static Connection getConnection() throws SQLException {		String connName = dbUrl + host + ":" + port + "/" + databaseName;		return DriverManager.getConnection(connName);	}

访问每个页面都都要设置 连接的用户名和密码。

干脆直接来个过滤器,过滤每个请求。

<filter>		<filter-name>jdbc</filter-name>		<filter-class>filter.InitFilter</filter-class>	</filter>	<filter-mapping>		<filter-name>jdbc</filter-name>		<url-pattern>*.*</url-pattern>	</filter-mapping>
public class InitFilter implements Filter{		public void destroy() {	}	public void doFilter(ServletRequest req, ServletResponse response,			FilterChain chain) throws IOException, ServletException {		HttpServletRequest request = (HttpServletRequest)req;		JdbcUtil.host = request.getHeader("BAE_ENV_ADDR_SQL_IP");		JdbcUtil.port =request.getHeader("BAE_ENV_ADDR_SQL_PORT");		JdbcUtil.username = request.getHeader("BAE_ENV_AK");		JdbcUtil.password = request.getHeader("BAE_ENV_SK");		chain.doFilter(request, response);	}	public void init(FilterConfig arg0) throws ServletException {			}	}
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