java连接数据源-读取tomcat数据源配置

<Resource name="jdbc/news"
auth="Container"  type="javax.sql.DataSource"  maxActive="100"
maxIdle="30" maxWait="10000" username="root"  password="123456"
driverClassName="com.mysql.jdbc.Driver"
url="jdbc:mysql://127.0.0.1:3306/news?useUnicode=true&characterEncoding=GBK"/>

// 获取数据库连接
public Connection getConnection2() {
try {
//初始化上下文
Context cxt=new InitialContext();
//获取与逻辑名相关联的数据源对象
DataSource ds=(DataSource)cxt.lookup("java:comp/env/jdbc/news");
conn=ds.getConnection();
} catch (NamingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return conn;
}