{"id":2368,"date":"2020-10-15T15:06:03","date_gmt":"2020-10-15T07:06:03","guid":{"rendered":"http:\/\/admin.evshou.com\/?p=2368"},"modified":"2020-10-19T17:09:09","modified_gmt":"2020-10-19T09:09:09","slug":"2020javaweb%e6%95%99%e7%a8%8b%e4%b9%8bjdbc%e4%bc%98%e5%8c%96","status":"publish","type":"post","link":"https:\/\/www.9713job.com\/?p=2368","title":{"rendered":"2020Javaweb\u6559\u7a0b\u4e4bJDBC\u5e94\u7528"},"content":{"rendered":"<h3>2020Javaweb\u6559\u7a0b\u4e4bJDBC\u5e94\u7528<\/h3>\n<p><strong><span style=\"color: #ff0000;\">\u5c01\u88c5\u5de5\u5177\u7c7b\uff1a<\/span><\/strong><\/p>\n<p><span style=\"color: #ff0000;\">1.\u91cd\u7528\u6027\u65b9\u6848<\/span><\/p>\n<pre>package Utils;\r\n\r\nimport java.sql.Connection;\r\nimport java.sql.DriverManager;\r\nimport java.sql.ResultSet;\r\nimport java.sql.Statement;\r\n\r\npublic class DBUtils {\r\n<!--more-->\r\n\r\n\r\n    private static Connection connection=null;\r\n    private static String url=\"jdbc:mysql:\/\/localhost:3306\/demo2\";\r\n    private static String username=\"root\";\r\n    private static String password=\"root\";\r\n    \/\/\u7c7b\u52a0\u8f7d\u89e6\u53d1 \u6ce8\u518c\u9a71\u52a8\r\n    static{\r\n        try{\r\n            Class.forName(\"com.mysql.jdbc.Driver\");\r\n        }catch (Exception e){}\r\n    }\r\n    \/\/\u83b7\u53d6connection\u8fde\u63a5\u5bf9\u8c61\r\n    public static Connection getConnection(){\r\n        try{\r\n            connection= DriverManager.getConnection(url,username,password);\r\n            return  connection;\r\n        }catch (Exception e){}\r\n        return null;\r\n    }\r\n    \/\/\u91ca\u653e\u8d44\u6e90\r\n    public static void closeAll(ResultSet rs, Statement s,Connection c){\r\n        try{\r\n            if (rs != null) {\r\n                rs.close();\r\n            }\r\n            if (s != null) {\r\n                s.close();\r\n            }\r\n            if (c != null) {\r\n                c.close();\r\n            }\r\n        }catch (Exception e){}\r\n    }\r\n}<\/pre>\n<p><strong><span style=\"color: #ff0000;\">2.\u8de8\u5e73\u53f0\u65b9\u6848<\/span><\/strong><\/p>\n<p>db.properties\u914d\u7f6e\u6587\u4ef6\uff1a<\/p>\n<pre>#\u8fde\u63a5\u8bbe\u7f6e\r\ndriverClassName=com.mysql.jdbc.Driver\r\nurl=jdbc:mysql:\/\/localhost:3306\/demo2?useUnicode=true&amp;characterEncoding=utf-8\r\nusername=root\r\npassword=1234\r\n#&lt;!-- \u521d\u59cb\u5316\u8fde\u63a5 --&gt;\r\ninitialSize=10\r\n#\u6700\u5927\u8fde\u63a5\u6570\u91cf\r\nmaxActive=50\r\n#&lt;!-- \u6700\u5c0f\u7a7a\u95f2\u8fde\u63a5 --&gt;\r\nminIdle=5\r\n#&lt;!-- \u8d85\u65f6\u7b49\u5f85\u65f6\u95f4\u4ee5\u6beb\u79d2\u4e3a\u5355\u4f4d 6000\u6beb\u79d2\/1000\u7b49\u4e8e60\u79d2 --&gt;\r\nmaxWait=5000<\/pre>\n<pre>\u5de5\u5177\u7c7b\r\npackage Utils;\r\n\r\nimport java.sql.Connection;\r\nimport java.sql.DriverManager;\r\nimport java.sql.ResultSet;\r\nimport java.sql.Statement;\r\nimport java.util.Properties;\r\n\r\npublic class DBUtils {\r\n    private static Connection connection=null;\r\n    private static String driver;\r\n    private static String url;\r\n    private static String username;\r\n    private static String password;\r\n    \/\/\u7c7b\u52a0\u8f7d\u89e6\u53d1 \u6ce8\u518c\u9a71\u52a8\r\n    static{\r\n        try{\r\n            Properties properties=new Properties();\r\n            properties.load(DBUtils.class.getClassLoader().getResourceAsStream(\"database.properties\"));\r\n            driver=properties.getProperty(\"driver\");\r\n            url= properties.getProperty(\"url\");\r\n            username=properties.getProperty(\"username\");\r\n            password=properties.getProperty(\"password\");\r\n            Class.forName(driver);\r\n        }catch (Exception e){}\r\n    }\r\n    \/\/\u83b7\u53d6connection\u8fde\u63a5\u5bf9\u8c61\r\n    public static Connection getConnection(){\r\n        try{\r\n            connection= DriverManager.getConnection(url,username,password);\r\n            return  connection;\r\n        }catch (Exception e){}\r\n        return null;\r\n    }\r\n    \/\/\u91ca\u653e\u8d44\u6e90\r\n    public static void closeAll(ResultSet rs, Statement s,Connection c){\r\n        try{\r\n            if (rs != null) {\r\n                rs.close();\r\n            }\r\n            if (s != null) {\r\n                s.close();\r\n            }\r\n            if (c != null) {\r\n                c.close();\r\n            }\r\n        }catch (Exception e){}\r\n    }\r\n}<\/pre>\n<p><strong><span style=\"color: #ff0000;\">ResultSet\u67e5\u8be2\u5c01\u88c5<\/span><\/strong><\/p>\n<p><strong>ORM(Object Relational Mapping) \u5b9e\u4f53\u7c7b(entity)\uff1a\u96f6\u6563\u6570\u636e\u7684\u8f7d\u4f53<\/strong><\/p>\n<p>\u4eceResultSet\u4e2dget\u76f8\u5e94\u7684\u5b57\u6bb5\u503c\u540e\u8c03\u7528\u5b9e\u4f53\u5bf9\u8c61\u7684\u5bf9\u5e94\u7684\u5c5e\u6027\u7684set\u65b9\u6cd5\uff0c\u628a\u503c\u4fdd\u5b58\u5728\u5b9e\u4f53\u5bf9\u8c61\u4e2d\u3002<\/p>\n<p><span style=\"color: #ff0000;\">\u5b9e\u4f53\u7c7b\uff1a\u5305\u540dentity\uff0c\u7c7b\u540d\u4e3a\u8868\u540d\u4e14\u9996\u5b57\u6bcd\u5927\u5199\uff0c\u5982\u7c7b\u540duser\uff0c\u7c7b\u540d\u4e3aUser<br \/>\n\u5305\u542b\u5c5e\u6027\u3001\u6784\u9020\u65b9\u6cd5\u548cset\/get\u65b9\u6cd5\u4ee5\u53catoString()\u65b9\u6cd5<\/span><\/p>\n<pre>import Utils.DBUtils;\r\nimport entity.Student;\r\n\r\nimport java.sql.Connection;\r\nimport java.sql.Date;\r\nimport java.sql.PreparedStatement;\r\nimport java.sql.ResultSet;\r\nimport java.util.ArrayList;\r\nimport java.util.List;\r\n\r\npublic class TestDql {\r\n    public static void main(String[] args) {\r\n        Connection connection=null;\r\n        PreparedStatement ps=null;\r\n        ResultSet rs=null;\r\n        List&lt;Student&gt; list=new ArrayList&lt;Student&gt;();\r\n        try{\r\n            connection=DBUtils.getConnection();\r\n            String sql=\"select*from student\";\r\n            ps=connection.prepareStatement(sql);\r\n            rs=ps.executeQuery();\r\n            while (rs.next()) {\r\n                int sid = rs.getInt(1);\r\n                String sname = rs.getString(2);\r\n                int sage = rs.getInt(3);\r\n                String ssex = rs.getString(4);\r\n                Date birthday = rs.getDate(5);\r\n                double score = rs.getDouble(6);\r\n                Student s=new Student();\r\n                s.setSid(sid);\r\n                s.setSname(sname);\r\n                s.setSage(sage);\r\n                s.setSsex(ssex);\r\n                s.setBirthday(birthday);\r\n                s.setScore(score);\r\n                list.add(s);\r\n                System.out.println(s);\r\n            }\r\n        }catch (Exception e){}finally {\r\n            DBUtils.closeAll(rs,ps,connection);\r\n        }\r\n    }\r\n}<\/pre>\n<p><strong><span style=\"color: #ff0000;\">DAO\u6a21\u5f0f<\/span><\/strong><\/p>\n<p><span style=\"color: #ff0000;\">\u5de5\u5177\u7c7b\u5c01\u88c5\uff1a\u5b9e\u73b0\u5bf9\u8868\u7684\u589e\u5220\u6539\u67e5<\/span><\/p>\n<p>DAO\u8bbe\u8ba1\u6a21\u5f0f<\/p>\n<p><span style=\"color: #ff0000;\">DAO(Database Access Object)\u6570\u636e\u5e93\u8bbf\u95ee\u5bf9\u8c61<\/span><\/p>\n<p>\u4e3a\u4e86\u964d\u4f4e\u8026\u5408\u6027\uff0c\u63d0\u51fa\u4e86DAO\u5c01\u88c5\u6570\u636e\u5e93\u64cd\u4f5c\u7684\u8bbe\u8ba1\u6a21\u5f0f\u3002\u5b9e\u73b0\u4e1a\u52a1\u903b\u8f91\u4e0e\u6570\u636e\u5e93\u8bbf\u95ee\u76f8\u5206\u79bb<\/p>\n<p><span style=\"color: #ff0000;\">DAO\u6a21\u5f0f\u7684\u7ec4\u6210\u90e8\u5206<\/span><\/p>\n<p>1.DAO\u63a5\u53e3\uff1a\u589e\u5220\u6539\u67e5<br \/>\n2.DAO\u5b9e\u73b0\u7c7b<br \/>\n3.\u5b9e\u4f53\u7c7b\uff1aentity<br \/>\n4.\u6570\u636e\u5e93\u8fde\u63a5\u548c\u5173\u95ed\u5de5\u5177\u7c7b<\/p>\n<p>\u5305\u540d\uff1a<br \/>\n<span style=\"color: #ff0000;\">entity\u5b9e\u4f53\u7c7b\u3001utils\u5de5\u5177\u7c7b\u3001dao\u5b58\u653e\u63a5\u53e3\u3001dao.impl \u5b58\u653e\u5b9e\u73b0\u7c7b\u3001service\u4e1a\u52a1\u5c42\u63a5\u53e3\u3001service.impl\u4e1a\u52a1\u5b9e\u73b0\u3001view\u89c6\u56fe\u5c42<\/span><\/p>\n<p>\u4f7f\u7528DAO\u8bbe\u8ba1\u6a21\u5f0f\u5b9e\u73b0\u5bf9\u8868\u7684 \u589e\u5220\u6539\u67e5<\/p>\n<p><span style=\"color: #ff0000;\">\u5b9e\u4f53\u7c7bentity\uff1aUser<\/span><br \/>\n\u79c1\u6709\u5c5e\u6027\u3001\u6784\u9020\u65b9\u6cd5\u3001set\/get\u65b9\u6cd5\u3001toString()\u65b9\u6cd5<\/p>\n<p><span style=\"color: #ff0000;\">\u63a5\u53e3dao\uff1aUserDao<\/span><br \/>\n\u67e5\u8be2\u6240\u6709\uff1aList&lt;User&gt; findAll();<br \/>\n\u67e5\u8be2\u5355\u4e2a\uff1aUser getUser(int id);<br \/>\n\u65b0\u589e\u6570\u636e\uff1avoid add(User u);<br \/>\n\u5220\u9664\u6570\u636e\uff1avoid delete(int id);<br \/>\n\u4fee\u6539\u6570\u636e\uff1avoid update(User u);<\/p>\n<p><span style=\"color: #ff0000;\">\u63a5\u53e3\u5b9e\u73b0\u7c7b\uff1aUserDaoImpl<\/span><br \/>\n\u5b9e\u73b0UserDao\u63a5\u53e3\uff0c\u91cd\u5199\u63a5\u53e3\u65b9\u6cd5\uff0c\u6267\u884cDML\u8bed\u53e5\u4ee5\u53caDQL<\/p>\n<p><span style=\"color: #ff0000;\">\u4e1a\u52a1\u5c42\u63a5\u53e3service\uff1aUserService<\/span><br \/>\n\u63a5\u53e3\u65b9\u6cd5\u4e0eDAO\u5c42\u4e00\u81f4<\/p>\n<p><span style=\"color: #ff0000;\">\u4e1a\u52a1\u5c42\u5b9e\u73b0\u7c7b\uff1aUserServiceImpl<br \/>\n<\/span>\u521b\u5efaUserDao\u63a5\u53e3\u5bf9\u8c61\u5f15\u7528UserDaoImpl\u5b9e\u73b0\u7c7b\u5bf9\u8c61\uff1a<br \/>\nprivate UserDao userdao=new UserDaoImpl();<br \/>\n\u65b9\u6cd5\u8fd4\u56de\u503c \u662f userdao.\u65b9\u6cd5\u540d<\/p>\n<p><span style=\"color: #ff0000;\">\u89c6\u56fe\u5c42view\uff1a\u5c55\u793a\u83dc\u5355<\/span><\/p>\n<pre>import DAO.StudentDao;\r\nimport DAO.impl.StudentDaoIimpl;\r\nimport entity.Student;\r\nimport java.text.*;\r\nimport java.util.*;\r\n\r\npublic class View {\r\n    private static StudentDao sd=new StudentDaoIimpl();\r\n    private static Scanner sc=new Scanner(System.in);\r\n    public static void main(String[] args) {\r\n        System.out.println(\"1.\u67e5\u770b\u6240\u6709\u5b66\u751f\u4fe1\u606f 2.\u67e5\u770b\u6307\u5b9a\u5b66\u751f\u4fe1\u606f 3.\u65b0\u589e\u5b66\u751f\u4fe1\u606f\\n 4.\u5220\u9664\u6307\u5b9a\u5b66\u751f\u4fe1\u606f 5.\u4fee\u6539\u6307\u5b9a\u5b66\u751f\u4fe1\u606f\");\r\n        System.out.println(\"\u8bf7\u9009\u62e9\u4f60\u8981\u7684\u64cd\u4f5c\");\r\n        int n=sc.nextInt();\r\n        switch (n){\r\n            case 1:showAll();\r\n            break;\r\n            case 2:getId();\r\n            break;\r\n            case 3:add();\r\n            break;\r\n            case 4:delete();\r\n            break;\r\n            case 5:update();\r\n            break;\r\n            default:break;\r\n        }\r\n    }\r\n    public static void showAll(){\r\n        List&lt;Student&gt; all = sd.findAll();\r\n        for (Student student : all) {\r\n            System.out.println(student);\r\n        }\r\n    }\r\n    public static void getId(){\r\n        System.out.println(\"\u8bf7\u8f93\u5165\u4f60\u8981\u67e5\u8be2\u7684\u5b66\u751f\u7f16\u53f7\");\r\n        int id=sc.nextInt();\r\n        System.out.println(sd.getStudent(id));\r\n    }\r\n    public static void add(){\r\n        Student s = info();\r\n        int add = sd.add(s);\r\n        if(add&gt;0) System.out.println(\"\u65b0\u589e\u6210\u529f\");\r\n        else System.out.println(\"\u65b0\u589e\u5931\u8d25\");\r\n    }\r\n    public static void delete(){\r\n        System.out.println(\"\u8bf7\u8f93\u5165\u5b66\u751f\u7f16\u53f7\");\r\n        int n=sc.nextInt();\r\n        int delete = sd.delete(n);\r\n        if(delete&gt;0) System.out.println(\"\u5220\u9664\u6210\u529f\");\r\n        else System.out.println(\"\u5220\u9664\u5931\u8d25\");\r\n    }\r\n    public static Student info() {\r\n        Student s=null;\r\n        System.out.println(\"\u8bf7\u8f93\u5165\u59d3\u540d\");\r\n        String sname=sc.next();\r\n        System.out.println(\"\u8bf7\u8f93\u5165\u5e74\u9f84\");\r\n        int sage=sc.nextInt();\r\n        System.out.println(\"\u8bf7\u8f93\u5165\u6027\u522b\");\r\n        String ssex=sc.next();\r\n        System.out.println(\"\u8bf7\u8f93\u5165\u751f\u65e5\uff0c\u598219951113\");\r\n        String birthday=sc.next();\r\n        System.out.println(\"\u8bf7\u8f93\u5165\u6210\u7ee9\");\r\n        double score=sc.nextDouble();\r\n        String s1 = birthday.substring(0,4);\r\n        String s2 = birthday.substring(4, 6);\r\n        String s3 = birthday.substring(6,8);\r\n        SimpleDateFormat sdf=new SimpleDateFormat(\"yyyy-MM-dd\");\r\n        Date date= null;\r\n        try {\r\n            date = sdf.parse(s1+\"-\"+s2+\"-\"+s3);\r\n        } catch (ParseException e) {\r\n            e.printStackTrace();\r\n        }\r\n        s=new Student();\r\n        s.setSname(sname);\r\n        s.setSage(sage);\r\n        s.setSsex(ssex);\r\n        s.setBirthday(date);\r\n        s.setScore(score);\r\n        return s;\r\n    }\r\n    public static void update(){\r\n        Student s = info();\r\n        System.out.println(\"\u8bf7\u8f93\u5165\u8981\u66f4\u6539\u7684\u5b66\u751f\u7f16\u53f7\");\r\n        int sid=sc.nextInt();\r\n        s.setSid(sid);\r\n        int update = sd.update(s);\r\n        if(update&gt;0) System.out.println(\"\u4fee\u6539\u6210\u529f\");\r\n        else System.out.println(\"\u4fee\u6539\u5931\u8d25\");\r\n    }\r\n}<\/pre>\n<p><strong><span style=\"color: #ff0000;\">Druid\u8fde\u63a5\u6c60<\/span><\/strong><\/p>\n<p><span style=\"color: #ff0000;\">\u4e3a\u4ec0\u4e48\u8981\u4f7f\u7528\u8fde\u63a5\u6c60\uff1f<\/span><\/p>\n<p>\u7528\u6237\u6bcf\u6b21\u8bf7\u6c42\u90fd\u9700\u8981\u5411\u6570\u636e\u5e93\u83b7\u5f97\u8fde\u63a5\uff0c\u800c\u6570\u636e\u5e93\u521b\u5efa\u8fde\u63a5\u901a\u5e38\u9700\u8981\u6d88\u8017\u76f8\u5bf9\u8f83\u5927\u7684\u8d44\u6e90\uff0c\u521b\u5efa\u65f6\u95f4\u4e5f\u8f83\u957f\u3002\u5047\u8bbe\u7f51\u7ad9\u4e00\u592910\u4e07\u8bbf\u95ee\u91cf\uff0c\u6570\u636e\u5e93\u670d\u52a1\u5668\u5c31\u9700\u8981\u521b\u5efa10\u4e07\u6b21\u8fde\u63a5\uff0c\u6781\u5927\u7684\u6d6a\u8d39\u6570\u636e\u5e93\u7684\u8d44\u6e90\uff0c\u5e76\u4e14\u6781\u6613\u9020\u6210\u6570\u636e\u5e93\u670d\u52a1\u5668\u5185\u5b58\u6ea2\u51fa\u3001\u5b95\u673a\u3002<br \/>\n\u73b0\u6d41\u884c\u7684\u6709\uff1aDBCP\u3001C3P0\u3001Druid\u7b49<\/p>\n<p><span style=\"color: #ff0000;\">Druid\u8fde\u63a5\u6c60\u7b80\u4ecb\uff1a<\/span><\/p>\n<p>Druid \u662f\u76ee\u524d\u6bd4\u8f83\u6d41\u884c\u7684\u9ad8\u6027\u80fd\u7684\uff0c\u5206\u5e03\u5f0f\u5217\u5b58\u50a8\u7684OLAP\u6846\u67b6(\u5177\u4f53\u6765\u8bf4\u662fMOLAP)\u3002<\/p>\n<p><strong><span style=\"color: #ff0000;\">Druid\u8fde\u63a5\u6c60\u4e94\u5927\u7279\u70b9\uff1a<\/span><\/strong><\/p>\n<p><span style=\"color: #ff0000;\">1.\u4e9a\u79d2\u7ea7\u67e5\u8be2<\/span><br \/>\ndruid\u63d0\u4f9b\u4e86\u5feb\u901f\u7684\u805a\u5408\u80fd\u529b\u4ee5\u53ca\u4e9a\u79d2\u7ea7\u7684OLAP\u67e5\u8be2\u80fd\u529b\uff0c\u591a\u79df\u6237\u7684\u8bbe\u8ba1\uff0c\u662f\u9762\u5411\u7528\u6237\u5206\u6790\u5e94\u7528\u7684\u7406\u60f3\u65b9\u5f0f\u3002<\/p>\n<p><span style=\"color: #ff0000;\">2.\u5b9e\u65f6\u6570\u636e\u6ce8\u5165<\/span><br \/>\ndruid\u652f\u6301\u6d41\u6570\u636e\u7684\u6ce8\u5165\uff0c\u5e76\u63d0\u4f9b\u4e86\u6570\u636e\u7684\u4e8b\u4ef6\u9a71\u52a8\uff0c\u4fdd\u8bc1\u5728\u5b9e\u65f6\u548c\u79bb\u7ebf\u73af\u5883\u4e0b\u4e8b\u4ef6\u7684\u5b9e\u6548\u6027\u548c\u7edf\u4e00\u6027<\/p>\n<p><span style=\"color: #ff0000;\">3.\u53ef\u6269\u5c55\u7684PB\u7ea7\u5b58\u50a8<\/span><br \/>\ndruid\u96c6\u7fa4\u53ef\u4ee5\u5f88\u65b9\u4fbf\u7684\u6269\u5bb9\u5230PB\u7684\u6570\u636e\u91cf\uff0c\u6bcf\u79d2\u767e\u4e07\u7ea7\u522b\u7684\u6570\u636e\u6ce8\u5165\u3002\u5373\u4fbf\u5728\u52a0\u5927\u6570\u636e\u89c4\u6a21\u7684\u60c5\u51b5\u4e0b\uff0c\u4e5f\u80fd\u4fdd\u8bc1\u65f6\u5176\u6548\u6027<\/p>\n<p><span style=\"color: #ff0000;\">4.\u591a\u73af\u5883\u90e8\u7f72<\/span><br \/>\ndruid\u65e2\u53ef\u4ee5\u8fd0\u884c\u5728\u5546\u4e1a\u7684\u786c\u4ef6\u4e0a\uff0c\u4e5f\u53ef\u4ee5\u8fd0\u884c\u5728\u4e91\u4e0a\u3002\u5b83\u53ef\u4ee5\u4ece\u591a\u79cd\u6570\u636e\u7cfb\u7edf\u4e2d\u6ce8\u5165\u6570\u636e\uff0c\u5305\u62echadoop\uff0cspark\uff0ckafka\uff0cstorm\u548csamza\u7b49<\/p>\n<p><span style=\"color: #ff0000;\">5.\u4e30\u5bcc\u7684\u793e\u533a<\/span><br \/>\ndruid\u62e5\u6709\u4e30\u5bcc\u7684\u793e\u533a\uff0c\u4f9b\u5927\u5bb6\u5b66\u4e60<\/p>\n<p><strong><span style=\"color: #ff0000;\">\u4f7f\u7528Druid\u8fde\u63a5\u6c60\uff1a<\/span><\/strong><\/p>\n<pre>package Utils;\r\n\r\nimport com.alibaba.druid.pool.DruidDataSource;\r\nimport com.alibaba.druid.pool.DruidDataSourceFactory;\r\n\r\nimport java.sql.*;\r\nimport java.util.Properties;\r\n\r\npublic class DBUtils{\r\n    private static DruidDataSource dataSource;\r\n    static{\r\n        Properties properties=new Properties();\r\n        try {\r\n            properties.load(DBUtils.class.getClassLoader().getResourceAsStream(\"database.properties\"));\r\n            dataSource= (DruidDataSource) DruidDataSourceFactory.createDataSource(properties);\r\n        } catch (Exception e) {\r\n            e.printStackTrace();\r\n        }\r\n    }\r\n    public static DruidDataSource getDataSource(){\r\n        return dataSource;\r\n    }\r\n    public static void closeAll(ResultSet rs, Statement s, Connection c){\r\n        try{\r\n            if (rs != null) {\r\n                rs.close();\r\n            }\r\n            if (s != null) {\r\n                s.close();\r\n            }\r\n            if (c != null) {\r\n                c.close();\r\n            }\r\n        }catch (Exception e){}\r\n    }\r\n}<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>2020Javaweb\u6559\u7a0b\u4e4bJDBC\u5e94\u7528 \u5c01\u88c5\u5de5\u5177\u7c7b\uff1a 1.\u91cd\u7528\u6027\u65b9\u6848 package Utils; impo [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-2368","post","type-post","status-publish","format-standard","hentry"],"_links":{"self":[{"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/posts\/2368","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.9713job.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2368"}],"version-history":[{"count":4,"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/posts\/2368\/revisions"}],"predecessor-version":[{"id":2392,"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/posts\/2368\/revisions\/2392"}],"wp:attachment":[{"href":"https:\/\/www.9713job.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2368"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.9713job.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2368"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.9713job.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2368"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}