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JdbcUtils.java工具包：
1 package com.xxyh.jdbc; 2 import java.sql.Connection; 3 import java.sql.DriverManager; 4 import java.sql.ResultSet; 5 import java.sql.SQLException; 6 import java.sql.Statement; 7 public class JdbcUtils { 8 9 private static final String url = "jdbc:mysql://localhost:3306/jdbc"; 10 private static final String user = "root"; 11 private static final String password = "1234"; 12 13 private JdbcUtils() { 14 } 15 16 static { 17 try { 18 // 将注册驱动放在静态代码块中只需执行一次 19 Class.forName("com.mysql.jdbc.Driver"); 20 } catch(ClassNotFoundException e) { 21 throw new ExceptionInInitializerError(e); 22 } 23 } 24 25 public static Connection getConnection() throws SQLException { 26 return DriverManager.getConnection(url, user, password); 27 } 28 29 public static void close(ResultSet rs, Statement stmt, Connection conn) { 30 try { 31 if (rs != null) { 32 rs.close(); 33 } 34 } catch (SQLException e) { 35 e.printStackTrace(); 36 } finally { 37 try { 38 if (stmt != null) { 39 stmt.close(); 40 } 41 } catch (SQLException e) { 42 e.printStackTrace(); 43 } finally { 44 if (conn != null) { 45 try { 46 conn.close(); 47 } catch (SQLException e) { 48 e.printStackTrace(); 49 } 50 } 51 } 52 } 53 } 54 }
1 package com.xxyh.jdbc.test; 2 import java.sql.Connection; 3 import java.sql.ResultSet; 4 import java.sql.SQLException; 5 import java.sql.Statement; 6 import com.xxyh.jdbc.JdbcUtils; 7 public class JdbcUtilsTest { 8 public static void main(String[] args) throws SQLException { 9 Connection conn = null; 10 Statement stmt = null; 11 ResultSet rs = null; 12 13 try { 14 conn = JdbcUtils.getConnection(); 15 stmt = conn.createStatement(); 16 rs = stmt.executeQuery("select * from user"); 17 18 while (rs.next()) { 19 System.out.println(rs.getObject("id") + "\t" + rs.getObject("name") + "\t" + 20 rs.getObject("birthday") + "\t" + rs.getObject("money")); 21 } 22 } finally { 23 JdbcUtils.close(rs, stmt, conn); 24 } 25 } 26 }
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原文地址：http://www.cnblogs.com/xiaoxiaoyihan/p/4340189.html
