数据库连接的代码

package cn.csdn.web.util;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class JdbcUtil {

//单例模式创建connection对象
private static Connection conn=null;
private static final String URL="jdbc:mysql://localhost:3306/3g?user=root&password=8058902&useUnicode=true&characterEncoding=UTF8";
//获取connection对象的静态方法
public static Connection getConn(){
if(conn==null){
//准备驱动程序
//创建链接对象
try {
Class.forName("com.mysql.jdbc.Driver");
conn= DriverManager.getConnection(URL);
} catch (Exception e) {
System.out.println("conn创建失败");
e.printStackTrace();
}

}
return conn;
}
public static void release(ResultSet rs,PreparedStatement pstmt){
if(rs!=null){
try {
rs.close();
} catch (SQLException e) {

e.printStackTrace();
}
}
if(pstmt!=null){
try {
pstmt.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

}