tomcat配置连接池
Tomcat5.0.28,jdk1.5,windowsXP，mysql5.0
主要依据Tomcat的帮助文档：
http://127.0.0.1:8080/tomcat-docs/jndi-datasource-examples-howto.html
1：创建数据库，用户名以及密码
mysql> GRANT ALL PRIVILEGES ON *.* TO javauser@localhost
-> IDENTIFIED BY 'javadude ' WITH GRANT OPTION;
mysql> create database javatest;
mysql> use javatest;
mysql> create table testdata (
-> id int not null auto_increment primary key,
-> foo varchar(25),
-> bar int);
2：添加数据
mysql> insert into testdata values(null, 'hello ', 12345);
Query OK, 1 row affected (0.00 sec)
mysql> select * from testdata;
+----+-------+-------+
| ID | FOO | BAR |
+----+-------+-------+
| 1 | hello | 12345 |
+----+-------+-------+
1 row in set (0.00 sec)
mysql>
3:配置server.xml文档，即将以下文件插入到server.xml的 <host> </host> 标记之间
<!--Context path= "/DBTest " docBase= "DBTest "－－－－－此处tomcat的文档是有错误的（反正我配置不对）应该是以下配置，其中ss代表你的WEB程序名称-->
<Context path= "/ss " docBase= "ss " debug= "5 " reloadable= "true ">
debug= "5 " reloadable= "true " crossContext= "true ">
<Logger className= "org.apache.catalina.logger.FileLogger "
prefix= "localhost_DBTest_log. " suffix= ".txt "
timestamp= "true "/>
<Resource name= "jdbc/TestDB "
auth= "Container "
type= "javax.sql.DataSource "/>
<ResourceParams name= "jdbc/TestDB ">
<parameter>
<name> factory </name>
<value> org.apache.commons.dbcp.BasicDataSourceFactory </value>
</parameter>
<!-- Maximum number of dB connections in pool. Make sure you
configure your mysqld max_connections large enough to handle
all of your db connections. Set to 0 for no limit.
-->
<parameter>
<name> maxActive </name>
<value> 100 </value>
</parameter>
<!-- Maximum number of idle dB connections to retain in pool.
Set to -1 for no limit. See also the DBCP documentation on this
and the minEvictableIdleTimeMillis configuration parameter.
-->
<parameter>
<name> maxIdle </name>
<value> 30 </value>
</parameter>
<!-- Maximum time to wait for a dB connection to become available
in ms, in this example 10 seconds. An Exception is thrown if
this timeout is exceeded. Set to -1 to wait indefinitely.
-->
<parameter>
<name> maxWait </name>
<value> 10000 </value>
</parameter>
<!-- MySQL dB username and password for dB connections -->
<parameter>
<name> username </name>
<value> javauser </value>
</parameter>
<parameter>
<name> password </name>
<value> javadude </value>
</parameter>
<!-- Class name for the old mm.mysql JDBC driver - uncomment this entry and comment next
if you want to use this driver - we recommend using Connector/J though
<parameter>
<name> driverClassName </name>
<value> org.gjt.mm.mysql.Driver </value>
</parameter>
-->
<!-- Class name for the official MySQL Connector/J driver -->
<parameter>
<name> driverClassName </name>
<value> com.mysql.jdbc.Driver </value>
</parameter>
<!-- The JDBC connection url for connecting to your MySQL dB.
The autoReconnect=true argument to the url makes sure that the
mm.mysql JDBC Driver will automatically reconnect if mysqld closed the
connection. mysqld by default closes idle connections after 8 hours.
-->
<parameter>
<name> url </name>
<value> jdbc:mysql://localhost:3306/javatest?autoReconnect=true </value>
</parameter>
</ResourceParams>
</Context>
4：配置web.xml
<web-app xmlns= "http://java.sun.com/xml/ns/j2ee "
xmlns:xsi= "http://www.w3.org/2001/XMLSchema-instance "
xsi:schemaLocation= "http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd "
version= "2.4 ">
<!--这个标记是tomcat帮助文件多出来的，不需要 <web-app> -->
<description> MySQL Test App </description>
<resource-ref>
<description> DB Connection </description>
<res-ref-name> jdbc/TestDB </res-ref-name>
<res-type> javax.sql.DataSource </res-type>
<res-auth> Container </res-auth>
</resource-ref>
</web-app>
5：写测试文档，tomcat自己带的使用jstl标记库
<%@ taglib uri= "http://java.sun.com/jsp/jstl/sql " prefix= "sql " %>
<%@ taglib uri= "http://java.sun.com/jsp/jstl/core " prefix= "c " %>
<sql:query var= "rs " dataSource= "jdbc/TestDB ">
select id, foo, bar from testdata
</sql:query>
<html>
<head>
<title> DB Test </title>
</head>
<body>
<h2> Results </h2>
<c:forEach var= "row " items= "${rs.rows} ">
Foo ${row.foo} <br/>
Bar ${row.bar} <br/>
</c:forEach>
</body>
</html>
如果要使用以上代码作测试，你得下载jakarta-taglibs-standard-1.1.2.zip这个文件解压后，将jakarta-taglibs-standard-1.1.2\lib下的两个.jar文件copy到你的web应用程序的WEB_INFO\lib下面即可或者使用以下测试代码：
<%@ page contentType= "text/html; charset=GBK " %>
<%@ page import= "java.sql.*,javax.sql.DataSource,javax.naming.* ">
<html>
<head> <title> test.jsp </title> </head>
<meta http-equiv= "Content-Type " content= "text/html; charset=GBK ">
<body bgcolor= "#ffffff ">
<h1> test Tomcat </h1>
<%
try{Context initCtx=new InitialContext();
DataSource ds = (DataSource)initCtx.lookup( "java:comp/env/jdbc/TestDB ");
Connection conn=ds.getConnection();
out.println( "data from database: <br/> ");
Statement stmt=conn.createStatement();
ResultSet rs =stmt.executeQuery( "select id,foo from testdata ");
while(rs.next()){
out.println(rs.getInt( "id "));
out.println(rs.getString( "foo "));
}
rs.close();
stmt.close();
}catch(Exception e){
out.println(e.getMessage());
}
%>
</body>
</html>
[解决办法]
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