tomcat+mysql鏈接池配置

時間 2019-11-19

標籤 tomcat+mysql tomcat mysql 鏈接配置欄目 Tomcat 简体版

原文原文鏈接

在tomcat的context.xml中配置以下:javascript

<Context>html

java

<WatchedResource>WEB-INF/web.xml</WatchedResource>mysql

web

<!--sql

<Manager pathname="" />數據庫

-->apache

<!-- Uncomment this to enable Comet connection tacking (provides eventstomcat

on session expiration as well as webapp lifecycle) -->session

<!--

-->

<Resource name="jdbc/myDataSource" auth="Container"

type="javax.sql.DataSource"

maxActive="50" maxIdle="10" maxWait="5000"

username="root" password="1234"

driverClassName="org.gjt.mm.mysql.Driver"

url="jdbc:mysql://localhost/eshop" />

</Context>

在web項目中的web.xml中配置以下

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="2.5"

xmlns="http://java.sun.com/xml/ns/javaee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/javaee

http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

<welcome-file-list>

<welcome-file>index.jsp</welcome-file>

</welcome-file-list>

<resource-ref>

<description>DB Connection</description>

<res-ref-name>jdbc/myDataSource</res-ref-name>

<res-type>javax.sql.DataSource</res-type>

<res-auth>Container</res-auth>

</resource-ref>

</web-app>

在數據庫中作數據庫和表

Eshop.sql文件的內容以下：

/*!40101 SET CHARACTER SET 'utf8' */;

DROP DATABASE IF EXISTS eshop;

CREATE DATABASE eshop /*!40100 DEFAULT CHARACTER SET utf8 */;

USE eshop;

/*!40101 SET CHARACTER SET 'utf8' */;

CREATE TABLE cart1(

ID int(11) NOT NULL auto_increment,

SP_NAME varchar(40) default NULL,

SP_PRICE decimal(8,2) default NULL,

BUY_NUM int(11) default NULL,

COUNT decimal(9,2) default NULL,

PRIMARY KEY ID

) ENGINE=myisam DEFAULT CHARSET=utf8;

CREATE TABLE shop1(

SP_NO char(10) NOT NULL,

SP_NAME varchar(40) default NULL,

SP_PRICE decimal(8,2) default NULL,

SP_INFO varchar(200) default NULL,

SP_PIC varchar(50) default NULL,

PRIMARY KEY SP_NO

) ENGINE=myisam DEFAULT CHARSET=utf8;

INSERT INTO shop(SP_NO,SP_NAME,SP_PRICE,SP_INFO,SP_PIC) VALUES ('SP0001','音頻卡',950,'MAYA44 V3是具備24bit/96KHz專業指標的4進4出專業數字音頻卡','pic/pic01.jpg');

INSERT INTO shop(SP_NO,SP_NAME,SP_PRICE,SP_INFO,SP_PIC) VALUES ('SP0002','合成器',4980,'PK-6以較低的價格爲你提供E-MU最新的Proteus聲音和高質量的鍵盤','pic/pic02.jpg');

INSERT INTO shop(SP_NO,SP_NAME,SP_PRICE,SP_INFO,SP_PIC) VALUES ('SP0003','MP3',450,'功能提示支持USB2.0高速傳輸','pic/pic03.jpg');

INSERT INTO shop(SP_NO,SP_NAME,SP_PRICE,SP_INFO,SP_PIC) VALUES ('SP0004','監聽音箱',3800,'PX-T6A是強大的獨立雙功放、近場監聽系統的理想選擇','pic/pic04.jpg');

INSERT INTO shop(SP_NO,SP_NAME,SP_PRICE,SP_INFO,SP_PIC) VALUES ('SP0005','攝像機',29800,'3CCD\傳感器總象素：112萬像素','pic/pic05.jpg');

Index.jsp內容以下：

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%@ page import="java.sql.*"%>

<%@ page import="javax.sql.DataSource" %>

<%@ page import="javax.naming.*" %>

<html>

<head>

</head>

//裝載MySQL5.5的JDBC驅動

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

//創建數據庫鏈接

//String url ="jdbc:mysql://localhost:3306/eshop?user=root&password=1234&useUnicode=true&characterEncoding=utf8";

//Connection conn= DriverManager.getConnection(url);

//創建一個Statement對象，用於執行SQL語句

Context ctx=new InitialContext();

DataSource ds=(DataSource)ctx.lookup("java:comp/env/jdbc/myDataSource");

Connection conn=ds.getConnection();

Statement stat = conn.createStatement();

//執行查詢並獲得查詢結果

String sql = "select * from shop";

ResultSet rs = stat.executeQuery(sql);

<body>

<hr>

</tr>

String bm,name,price,info,img;

//將查詢結果集中的記錄輸出到頁面上

while (rs.next()){

//從當前記錄中讀取各字段的值

img = rs.getString("SP_PIC").trim();

bm = rs.getString("SP_NO").trim();

name = rs.getString("SP_NAME").trim();

price = rs.getString("SP_PRICE").trim();

info = rs.getString("SP_INFO").trim();

out.println("<tr>");

out.println("<td><img src='"+ img +"' border=0 height=60 width=60></td>");

out.println("<td>");

out.println("商品編號："+ bm +"<br>");

out.println("商品名稱："+ name +"<br>");

out.println("商品價格："+ price +"元<br>");

out.println("商品簡介："+ info +"<br>");

out.println("</td>");

out.println("<td><a href='buy.jsp?op=add&bm="+bm+"'>放入購物車</a></td>");

out.println("</tr>");

}

</table>

<br>

<a href="cart.jsp">查看購物車</a>  

<a href="buy.jsp?op=clear">清空購物車</a>

</body>

</html>

Buy.jsp

<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>

<%@ page import="java.sql.*"%>

<%@ page import="javax.sql.DataSource" %>

<%@ page import="javax.naming.*" %>

//裝載MySQL5.5的JDBC驅動

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

//創建數據庫鏈接

//String url ="jdbc:mysql://localhost:3306/eshop?user=root&password=1234&useUnicode=true&characterEncoding=gb2312";

//Connection conn= DriverManager.getConnection(url);

Context ctx=new InitialContext();

DataSource ds=(DataSource)ctx.lookup("java:comp/env/jdbc/myDataSource");

Connection conn=ds.getConnection();

PreparedStatement pstat = null;

ResultSet rs = null;

String sql = null;

String op = request.getParameter("op");

//將商品放入購物車

if (op.equals("add")){

//從商品庫中取出所選購商品的數據

String bm = request.getParameter("bm");

String name=null,price=null;

sql = "select * from shop where SP_NO=?";

pstat = conn.prepareStatement(sql);

pstat.setString(1,bm);

rs = pstat.executeQuery();

if (rs.next()){

name = rs.getString("SP_NAME").trim();

price = rs.getString("SP_PRICE").trim();

}

rs.close();

pstat.close();

//將所選購商品加入到購物車中

sql = "insert into cart(SP_NAME,SP_PRICE,BUY_NUM,COUNT) values(?,?,?,?)";

pstat = conn.prepareStatement(sql);

pstat.setString(1,name);

pstat.setString(2,price);

pstat.setInt(3,1);

pstat.setString(4,price);

pstat.executeUpdate();

pstat.close();

//關閉數據庫鏈接

conn.close();

//重定向到購物車頁面

response.sendRedirect("cart.jsp");

}

//更改商品的數量

if (op.equals("update")){

int id = Integer.parseInt(request.getParameter("id"));

int num = Integer.parseInt(request.getParameter("num"));

double price=Double.parseDouble(request.getParameter("price"));

sql = "update cart set BUY_NUM = ?, COUNT = ? where ID=?";

pstat = conn.prepareStatement(sql);

pstat.setInt(1,num);

pstat.setString(2,new Double(price*num).toString());

pstat.setInt(3,id);

pstat.executeUpdate();

pstat.close();

//關閉數據庫鏈接

conn.close();

//重定向到購物車頁面

response.sendRedirect("cart.jsp");

}

//將商品退回到商品架(將商品從購物車中刪除)

if (op.equals("del")){

int id = Integer.parseInt(request.getParameter("id"));

sql = "delete from cart where ID=?";

pstat = conn.prepareStatement(sql);

pstat.setInt(1,id);

pstat.executeUpdate();

pstat.close();

//關閉數據庫鏈接

conn.close();

//重定向到購物車頁面

response.sendRedirect("cart.jsp");

}

//清空購物車

if (op.equals("clear")){

sql = "delete from cart";

pstat = conn.prepareStatement(sql);

pstat.executeUpdate();

pstat.close();

//關閉數據庫鏈接

conn.close();

//重定向到購物車頁面

response.sendRedirect("cart.jsp");

}

Cart.jsp

<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>

<%@ page import="java.sql.*"%>

<%@ page import="javax.sql.DataSource" %>

<%@ page import="javax.naming.*" %>

<html>

<head>

<title>個人購物車</title>

</head>

//裝載MySQL5.5的JDBC驅動

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

//創建數據庫鏈接

//String url ="jdbc:mysql://localhost:3306/eshop?user=root&password=1234&useUnicode=true&characterEncoding=gb2312";

//Connection conn= DriverManager.getConnection(url);

//創建一個Statement對象，用於執行SQL語句

Context ctx=new InitialContext();

DataSource ds=(DataSource)ctx.lookup("java:comp/env/jdbc/myDataSource");

Connection conn=ds.getConnection();

Statement stat = conn.createStatement();

//執行查詢並獲得查詢結果

String sql = "select * from cart";

ResultSet rs = stat.executeQuery(sql);

<body>

<h2>個人購物車</h2>

<hr>

</tr>

String id,name,price,num,count;

//將查詢結果集中的記錄輸出到頁面上

while (rs.next()){

//從當前記錄中讀取各字段的值

id = rs.getString("ID").trim();

name = rs.getString("SP_NAME").trim();

price = rs.getString("SP_PRICE").trim();

num = rs.getString("BUY_NUM").trim();

count = rs.getString("COUNT").trim();

out.println("<tr>");

out.println("<td>"+ name +"</td>");

out.println("<td>"+ price +"</td>");

out.println("<td><input type=text value="+ num +" onChange=\"updateNum('"+id+"',this.value,'"+price+"')\"></td>");

out.println("<td>"+ count +"</td>");

out.println("<td><a href='buy.jsp?op=del&id="+id+"'>退回商品架</a></td>");

out.println("</tr>");

}

</table>

<br>

<a href="buy.jsp?op=clear">清空購物車</a>

</body>

function updateNum(id,num,price){

var url = "buy.jsp?op=update&id="+id+"&num="+num+"&price="+price;

window.location = url;

}

</script>

</html>

Web項目的文件結構

相關標籤/搜索

每日一句

每一个你不满意的现在，都有一个你没有努力的曾经。