package com.JDBC.java;import java.io.IOException;import java.io.InputStream;import java.sql.Connection;import java.sql.DriverManager;import java.sql.SQLException;import java.sql.Statement;import java.util.Properties;/** * JDBC 的工具类 */public class JDBCTools {    /**     * 关闭Statement,Connection     *      * @param statement     * @param connection     */    public static void release(Statement statement, Connection connection) {        if (statement != null) {            try {                statement.close();            } catch (SQLException e) {                e.printStackTrace();            }        }        if (connection != null) {            try {                connection.close();            } catch (SQLException e) {                e.printStackTrace();            }        }    }    /**     * 获取数据库连接的方法     *      * @return     * @throws Exception     */    public static Connection getConnection() {        // 准备连接数据库的四个字符串        // 驱动的全类名        String driverClass = null;        String jdbcUrl = null;        String user = null;        String password = null;        String jdbcName = null;        // 读取jdbcName.properties文件        InputStream inStream = JDBCTools.class.getClassLoader().getResourceAsStream("properties/jdbcName.properties");        Properties propertiesOfName = new Properties();        try {            propertiesOfName.load(inStream);        } catch (IOException e) {            e.printStackTrace();        }        jdbcName = propertiesOfName.getProperty("jdbcName");        // 读取需要的properties 文件        InputStream in = JDBCTools.class.getClassLoader().getResourceAsStream("properties/" + jdbcName + ".properties");        Properties properties = new Properties();        try {            properties.load(in);        } catch (IOException e) {            e.printStackTrace();        }        driverClass = properties.getProperty("driver");        jdbcUrl = properties.getProperty("jdbcUrl");        user = properties.getProperty("user");        password = properties.getProperty("password");        // 加载数据库驱动程序(注册驱动)        try {            Class.forName(driverClass);        } catch (ClassNotFoundException e) {            e.printStackTrace();        }        Connection connection = null;        try {            connection = DriverManager.getConnection(jdbcUrl, user, password);        } catch (SQLException e) {            e.printStackTrace();        }        return connection;    }}

/**     * 通用的更新方法：包括INSERT/UPDATE/DELETE     * @param sql     */    public void update(String sql){        Connection connection = null;        Statement statement = null;        try {            connection = JDBCTools.getConnection();            statement = connection.createStatement();            statement.executeUpdate(sql);        }catch (Exception e) {            e.printStackTrace();        }finally{            JDBCTools.release(statement, connection);        }    }