1. 新建一個JDBCProperties工程

2. 編寫JDBCUtil.java

package com.lywgames.util;import java.io.IOException; import java.io.InputStream; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import java.util.Properties;public class JDBCUtil {private static String driverClass = null;private static String url = null;private static String name = null;private static String password= null;static {try {// 1.創建一個屬性配置對象Properties properties = new Properties();// 2.使用類加載器, 去讀取src底下的資源文件。對應文件位于src目錄底下InputStream is = JDBCUtil.class.getClassLoader().getResourceAsStream("jdbc.properties");// 3.導入輸入流。properties.load(is);// 4.讀取屬性driverClass = properties.getProperty("driverClass");url = properties.getProperty("url");name = properties.getProperty("name");password = properties.getProperty("password");} catch (IOException e) {e.printStackTrace();}}/*** 獲取連接對象*/public static Connection getConn(){Connection conn = null;try {Class.forName(driverClass);conn = DriverManager.getConnection(url, name, password);} catch (Exception e) {e.printStackTrace();}return conn;}/*** 釋放資源* @param conn* @param st* @param rs*/public static void release(Connection conn, Statement st, ResultSet rs){closeRs(rs);closeSt(st);closeConn(conn);}private static void closeRs(ResultSet rs){try {if(rs != null){rs.close();}} catch (SQLException e) {e.printStackTrace();}finally{rs = null;}}private static void closeSt(Statement st){try {if(st != null){st.close();}} catch (SQLException e) {e.printStackTrace();}finally{st = null;}}private static void closeConn(Connection conn){try {if(conn != null){conn.close();}} catch (SQLException e) {e.printStackTrace();}finally{conn = null;}}}

3. 在src目錄下編寫jdbc.properties屬性文件

4. 編寫MyJDBC.java使用我們的JDBCUtil.java

package com.lywgames.myjdbc;import java.sql.Connection; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import com.lywgames.util.JDBCUtil;public class MyJDBC {public static void main(String[] args) throws SQLException {// 1.獲取連接對象Connection conn = JDBCUtil.getConn(); // 2.創建statement, 跟數據庫打交道, 一定需要這個對象Statement st = conn.createStatement();// 3.執行查詢sql, 獲取ResultSet結果集ResultSet rs = st.executeQuery("select * from user");// 4.使用ResultSet結果集遍歷, 下標從1開始while(rs.next()) {System.out.println(rs.getInt(1) + " " + rs.getString(2) + " " + rs.getString(3) + " " + rs.getTimestamp(4));}// 5.釋放資源JDBCUtil.release(conn, st, rs);} }

5. 運行結果

總結

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