-----------------------------根據配置文件----------------------------

package cn.gdpe.jdbc;


import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
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 {
?? ?public static String url=null;
?? ?public static String user=null;
?? ?public static String password=null;
?? ?public static String driverName=null;
?? ?public static void close(Connection conn,Statement st){
?? ??? ?
?? ??? ??? ?try {
?? ??? ??? ??? ?if(conn!=null){
?? ??? ??? ??? ??? ?conn.close();
?? ??? ??? ??? ?}
?? ??? ??? ??? ?if(st!=null){
?? ??? ??? ??? ??? ?st.close();
?? ??? ??? ??? ?}
?? ??? ??? ?} catch (SQLException e) {
?? ??? ??? ??? ?e.printStackTrace();
?? ??? ??? ?}
?? ??? ?
?? ?}
?? ?public static void close(Connection conn,Statement st ,ResultSet rs){
?? ??? ?
?? ??? ??? ?try {
?? ??? ??? ??? ?if(rs!=null){
?? ??? ??? ??? ??? ?rs.close();
?? ??? ??? ??? ?}
?? ??? ??? ?} catch (SQLException e) {
?? ??? ??? ??? ?e.printStackTrace();
?? ??? ??? ?}finally{
?? ??? ??? ??? ?close(conn,st);
?? ??? ??? ?}
?? ??? ?
?? ?}
?? ?public static Connection getConnection(){
?? ??? ?Connection conn=null;
?? ??? ?try {
?? ??? ??? ?conn = DriverManager.getConnection(url,user,password);
?? ??? ??? ?return conn;
?? ??? ?} catch (SQLException e) {
?? ??? ??? ?e.printStackTrace();
?? ??? ?}
?? ??? ?return null;
?? ?}
?? ?
?? ?static {
?? ??? ?try {
?? ??? ??? ?InputStream inputStream = Demo1.class.getResourceAsStream("/db.properties");
?? ??? ??? ?Properties p=new Properties();
?? ??? ??? ?p.load(inputStream);
?? ??? ??? ?url=p.getProperty("url");
?? ??? ??? ?user=p.getProperty("user");
?? ??? ??? ?password=p.getProperty("password");
?? ??? ??? ?driverName=p.getProperty("driver");
?? ??? ??? ?Class.forName(driverName);
?? ??? ?} catch (ClassNotFoundException e) {
?? ??? ??? ?e.printStackTrace();
?? ??? ?} catch (FileNotFoundException e) {
?? ??? ??? ?// TODO Auto-generated catch block
?? ??? ??? ?e.printStackTrace();
?? ??? ?} catch (IOException e) {
?? ??? ??? ?// TODO Auto-generated catch block
?? ??? ??? ?e.printStackTrace();
?? ??? ?}
?? ?}
}

轉載于:https://www.cnblogs.com/ly-china/p/5470619.html

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