Java如何使用Properties建立与数据库的连接？
在以下代码片段中，您将看到在连接数据库时如何传递一些连接参数。为此，我们可以使用java.util.Properties该类。在将这些信息传递给DriverManager类之前，我们可以将一些键值对作为Properties对象的连接参数。
让我们看下面的例子：
package org.nhooo.example.jdbc;
import java.sql.*;
import java.util.Properties;
public class GetConnectionWithProperties {
private static final String URL = "jdbc:mysql://localhost/nhooo";
private static final String USERNAME = "root";
private static final String PASSWORD = "";
public static void main(String[] args) {
GetConnectionWithProperties demo = new GetConnectionWithProperties();
try (Connection connection = demo.getConnection()) {
// 对连接做一些事情。
Statement stmt = connection.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM products");
while (rs.next()) {
System.out.println("Code = " + rs.getString("code"));
System.out.println("Name = " + rs.getString("name"));
}
} catch (SQLException e) {
e.printStackTrace();
}
}
private Connection getConnection() throws SQLException {
Properties connectionProps = new Properties();
connectionProps.put("user", USERNAME);
connectionProps.put("password", PASSWORD);
Connection connection = DriverManager.getConnection(URL, connectionProps);
System.out.println("Connected to database.");
return connection;
}
}Maven依赖
<!-- https://search.maven.org/remotecontent?filepath=mysql/mysql-connector-java/8.0.17/mysql-connector-java-8.0.17.jar -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.17</version>
</dependency>