Web jsp开发学习——数据库的另一种连接方式（配置静态数据库连接池）

1.导包

2.找到sever里的sever.xml，配置静态数据库连接池

      <Context docBase="bookstore" path="/bookstore" reloadable="true" source="org.eclipse.jst.jee.server:bookstore">

             <Resource name="jdbc/bookstore" auth="Container" type="javax.sql.DataSource" maxActive="100"

                maxIdle="30"    maxWait="10000" username="root" password="caiyishuai"

                driverClassName="com.mysql.jdbc.Driver"

            url="jdbc:mysql://localhost:3306/bookstore?autoReconnect=true" />

      </Context>

3.再在web.xml里引用数据库连接池

web.xml中的

和sever.xml中的

要保持一致

4.在要调用数据库的地方改为

别忘了导包

<%@ page language="java" contentType="text/html; charset=UTF-8"

    import="java.util.*,java.text.*,com.xx17.cys.entity.*"

    import="java.sql.*,org.apache.commons.dbcp2.*"

    import="javax.naming.*,javax.sql.*" pageEncoding="UTF-8"%>

<%

//List<News> newslist = new ArrayList<News>();

    List newslist = new ArrayList();

    News news = new News(1,"今天是星期四","gfsggfsg",201,"2019-3-13",0);

    newslist.add(news);

    news = new News(2,"又可以上web课啦！","gfsggfshgffdhg",104,"2019-3-14",0);

    newslist.add(news);

    String newstitle[]={"今天是星期四！","又可以上web课啦！","下午公休，嘿嘿！","人生啊，如此艰难！","现在是上午9点20分"};

    String newsdate[]={"2019-3-13","2019-3-14","2019-3-15","2019-3-16","2019-3-17"};

    /*数据库连接池*/

    /*BasicDataSource ds = new BasicDataSource();

    String url="jdbc:mysql://localhost:3306/bookstore?user=root&password=caiyishuai";

    url += "&useUnicode=true&characterEncoding=utf8";

    ds.setDriverClassName(url);

    ds.setUsername("root");

    ds.setPassword("caiyishuai");

    ds.setMaxTotal(30);

    ds.setMinIdle(5);

    ds.setMaxWaitMillis(10000);

    ds.setRemoveAbandonedTimeout(100);

    ds.setRemoveAbandonedOnBorrow(true);

    ds.setRemoveAbandonedOnMaintenance(true);

    */

    /*使用静态数据库连接池*/

    Context initContext = new InitialContext();

    Context envContext = (Context)initContext.lookup("java:/comp/env");

    DataSource ds = (DataSource)envContext.lookup("jdbc/bookstore");

    //建立连接池连接

    Connection conn = ds.getConnection();

    /*Class.forName("com.mysql.jdbc.Driver");  ////驱动程序名

    String url = "jdbc:mysql://localhost:3306/bookstore"; //数据库名

    String username = "root";  //数据库用户名

    String password = "caiyishuai";  //数据库用户密码

    Connection conn = DriverManager.getConnection(url, username, password);  //连接状态*/

    if(conn != null){

        out.print("数据库连接成功！");

        Statement stmt = conn.createStatement();

        //创建结果集合，集合与表的结构类似

        ResultSet rs = stmt.executeQuery("select * from t_news");

        //rs.last

        //out.println("记录数："+rs.getRow());

        while(rs.next()){

            //System.out.println("rs"+rs);

              news = new News(1,rs.getString(1),rs.getString(2),rs.getInt(4),rs.getString(3),1);

              newslist.add(news);

        }

    }

    /*建立连接

    Connection conn = DriverManager.getConnection(url);

    创建语句环境

    Statement stmt = conn.createStatement();

    创建结果集合，集合与表的结构类似

    ResultSet rs = stmt.executeQuery("select * from t_news");

    rs.last

    out.println("记录数："+rs.getRow());

    Class.forName("com.mysql.jdbc.Driver").newInstance();

    com.mysql.jdbc.Driver d = new com.mysql.jdbc.Driver

    String url="jdbc:mysql://localhost:3306/bookstore?"

    +"user=root&password=caiyishuai&useUnicode=true&characterEncoding=utf8";

    List<News> newslist = new ArrayList<News>();

    News news;

    while(rs.next()){

        news = new News(1,rs.getString(1),rs.getString(2),rs.getInt(4),rs.getString(3),1);

        newslist.add(news);

    }*/

%>

<!DOCTYPE html>

<html>

<head>

<meta charset="UTF-8">

<title>新闻列表</title>

</head>

<body>

<link href="css/style.css" rel="stylesheet" type="text/css"/>

<jsp:include page="head.jsp?col=1"></jsp:include>

<div id="main" class="layout">

<%

    SimpleDateFormat formatter = new SimpleDateFormat("yyyy年MM月dd日");

    java.util.Date today = new java.util.Date();

    out.print(formatter.format(today));

    //out.print(today.toLocaleString());

    //int id =Integer.parseInt(str);

%>

<table width="1000" border="1">

    <tr><th>序号</th><th>标题</th><th>日期</th><th>点击</th></tr>

    <% String[] color={"red","orange","yellow","green","blue","purple","pink","black","brown"};%>

    <% for(int font_size=1;font_size<7;font_size++) {%>

        <br>

        <font color="<%= color[font_size-1] %>" size="<%= font_size %>">

            智慧的帅帅，么么哒！

        </font>

    <%}

    News n;

    %>

    <% for(int i=0;i<newslist.size();i++){

        n=(News)newslist.get(i);%>

        <tr>

        <td><% out.print(i+1);%></td>

        <td><a href="news.jsp?nid=<%=n.getNews_id()%>"><%=n.getNews_title()%></a></td>

        <td><%=n.getNews_date()%></td>

        <td><%=n.getNews_read()%></td>

        </tr>

    <%}    %>        

    <tr><td></td><td></td><td></td><td></td></tr>

    <tr><td></td><td></td><td></td><td></td></tr>

    <tr><td></td><td></td><td></td><td></td></tr>

</table>

</div>

<%@ include file="foot.jsp" %>

</body>

</html>

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Web jsp开发学习——数据库的另一种连接方式（配置静态数据库连接池）

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