env中包含了usename,password,具体你可以看看jdk的文档,下面是getConnection的描述:public static Connection getConnection(String url, Properties info) throws SQLException Attempts to establish a connection to the given database URL. The DriverManager attempts to select an appropriate driver from the set of registered JDBC drivers. Parameters: url - a database url of the form jdbc:subprotocol:subname info - a list of arbitrary string tag/value pairs as connection arguments; normally at least a "user" and "password" property should be included Returns: a Connection to the URL Throws: SQLException - if a database access error occurs
Properties info)
throws SQLException
Attempts to establish a connection to the given database URL. The DriverManager attempts to select an appropriate driver from the set of registered JDBC drivers.
Parameters:
url - a database url of the form jdbc:subprotocol:subname
info - a list of arbitrary string tag/value pairs as connection arguments; normally at least a "user" and "password" property should be included
Returns:
a Connection to the URL
Throws:
SQLException - if a database access error occurs