在MyEclipse中配置JNDI DataSource

在MyEclipse中配置JNDI DataSource<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

費了好一段時間，終於把Tomcat6中的JDBC數據源給配好。

我使用的是Tomcat 6.0 + MyEclipse6.0 + Mysql5.0，發現網上這個搭配並不多，自己參照官方文檔，好不容易終於搞定了，自己英語有點菜。

步驟一：在MyEclipse下新建一個Web Project（netshop），並將mysql-connector-java-5.1.6-bin.jar，jstl.jar，standard.jar三個jar包copy到/WEB-INF目錄下，

這三個jar包都可以在其官方網站下載。其中後面的兩個是後來在測試頁面中所需要使用的，當然也可以不用，但是第一個jar包則必須要使用，除非你不連接

數據庫。此時的目錄結構如下：

<?xml:namespace prefix = v ns = "urn:schemas-microsoft-com:vml" />

注：在Mysql中，實現已經建立了一個database(javatest)和一個表(testdata)

建表代碼如下：

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>

如此，就在mysql中配置好了數據庫和表。

數據庫用戶名和密碼如下：

username：root

password：passwd

步驟二：配置%CATALINA_HOME%/conf/server.xml，其配置過程與在tomcat5.x.x中有些不同。其部分代碼如下：

<Context path="/netshop" docBase="D:/MyEclipse 6.0/workspace/netshop/WebRoot"

debug="5" reloadable="true" crossContext="true">

<!-- maxActive: 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.

-->

<!-- maxIdle: 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.

-->

<!-- maxWait: 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.

-->

<!-- driverClassName: Class name for the old mm.mysql JDBC driver is

org.gjt.mm.mysql.Driver - we recommend using Connector/J though.

Class name for the official MySQL Connector/J driver is com.mysql.jdbc.Driver.

-->

<!-- url: 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.

-->

<Resource name="jdbc/javatest" auth="Container" type="javax.sql.DataSource"

maxActive="100" maxIdle="30" maxWait="10000"

username="root" password="passwd" driverClassName="com.mysql.jdbc.Driver"

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

</Context>

下面把整個server.xml代碼都給一起copy過來了，方便參照，當然也可以忽略這一部分

<?xml version='1.0' encoding='utf-8'?>

<!--

Licensed to the Apache Software Foundation (ASF) under one or more

contributor license agreements. See the NOTICE file distributed with

this work for additional information regarding copyright ownership.

The ASF licenses this file to You under the Apache License, Version 2.0

(the "License"); you may not use this file except in compliance with

the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software

distributed under the License is distributed on an "AS IS" BASIS,

WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

See the License for the specific language governing permissions and

limitations under the License.

-->

<!-- Note: A "Server" is not itself a "Container", so you may not

define subcomponents such as "Valves" at this level.

Documentation at /docs/config/server.html

-->

<!-- Global JNDI resources

Documentation at /docs/jndi-resources-howto.html

-->

<!-- Editable user database that can also be used by

UserDatabaseRealm to authenticate users

-->

<Resource name="UserDatabase" auth="Container"

type="org.apache.catalina.UserDatabase"

description="User database that can be updated and saved"

factory="org.apache.catalina.users.MemoryUserDatabaseFactory"

pathname="conf/tomcat-users.xml" />

</GlobalNamingResources>

<!-- A "Service" is a collection of one or more "Connectors" that share

a single "Container" Note: A "Service" is not itself a "Container",

so you may not define subcomponents such as "Valves" at this level.

Documentation at /docs/config/service.html

-->

<!--

<Executor name="tomcatThreadPool" namePrefix="catalina-exec-"

maxThreads="150" minSpareThreads="4"/>

-->

<!-- A "Connector" represents an endpoint by which requests are received

and responses are returned. Documentation at :

Java HTTP Connector: /docs/config/http.html (blocking & non-blocking)

Java AJP Connector: /docs/config/ajp.html

APR (HTTP/AJP) Connector: /docs/apr.html

Define a non-SSL HTTP/1.1 Connector on port 8080

-->

<Connector port="8080" protocol="HTTP/1.1"

connectionTimeout="20000"

redirectPort="8443" />

<!--

<Connector executor="tomcatThreadPool"

port="8080" protocol="HTTP/1.1"

connectionTimeout="20000"

redirectPort="8443" />

-->

<!-- Define a SSL HTTP/1.1 Connector on port 8443

This connector uses the JSSE configuration, when using APR, the

connector should be using the OpenSSL style configuration

described in the APR documentation -->

<!--

<Connector port="8443" protocol="HTTP/1.1" SSLEnabled="true"

maxThreads="150" scheme="https" secure="true"

clientAuth="false" sslProtocol="TLS" />

-->

<!-- An Engine represents the entry point (within Catalina) that processes

every request. The Engine implementation for Tomcat stand alone

analyzes the HTTP headers included with the request, and passes them

on to the appropriate Host (virtual host).

Documentation at /docs/config/engine.html -->

<!-- You should set jvmRoute to support load-balancing via AJP ie :

-->

<!--For clustering, please take a look at documentation at:

/docs/cluster-howto.html (simple how to)

/docs/config/cluster.html (reference documentation) -->

<!--

-->

<!-- The request dumper valve dumps useful debugging information about

the request and response data received and sent by Tomcat.

Documentation at: /docs/config/valve.html -->

<!--

-->

<!-- This Realm uses the UserDatabase configured in the global JNDI

resources under the key "UserDatabase". Any edits

that are performed against this UserDatabase are immediately

available for use by the Realm. -->

<Realm className="org.apache.catalina.realm.UserDatabaseRealm"

resourceName="UserDatabase"/>

<!-- Define the default virtual host

Note: XML Schema validation will not work with Xerces 2.2.

-->

<Host name="localhost" appBase="webapps"

unpackWARs="true" autoDeploy="true"

xmlValidation="false" xmlNamespaceAware="false">

<!-- SingleSignOn valve, share authentication between web applications

Documentation at: /docs/config/valve.html -->

<!--

-->

<!-- Access log processes all example.

Documentation at: /docs/config/valve.html -->

<!--

<Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"

prefix="localhost_access_log." suffix=".txt" pattern="common" resolveHosts="false"/>

-->

<Context path="/netshop" docBase="D:/MyEclipse 6.0/workspace/netshop/WebRoot"

debug="5" reloadable="true" crossContext="true">

<!-- maxActive: 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.

-->

<!-- maxIdle: 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.

-->

<!-- maxWait: 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.

-->

<!-- driverClassName: Class name for the old mm.mysql JDBC driver is

org.gjt.mm.mysql.Driver - we recommend using Connector/J though.

Class name for the official MySQL Connector/J driver is com.mysql.jdbc.Driver.

-->

<!-- url: 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.

-->

<Resource name="jdbc/javatest" auth="Container" type="javax.sql.DataSource"

maxActive="100" maxIdle="30" maxWait="10000"

username="root" password="passwd" driverClassName="com.mysql.jdbc.Driver"

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

</Context>

</Host>

</Engine>

</Service>

</Server>

步驟三：下面在配置/WEB-INF/web.xml

代碼如下：

<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">

<description>MySQL Test App</description>

<resource-ref>

<description>DB Connection</description>

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

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

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

</resource-ref>

</web-app>

步驟四：下面這一部分是測試代碼，只是測試代碼當然也可以用其他的代碼，我用的是文檔裏面的。

代碼如下：（testpool.jsp）

<%@ page language="java" pageEncoding="gbk"%>

<%@ 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/javatest">

select id, foo, bar from testdata

</sql:query>

<html>

<head>

</head>

<body>

<h2>

Results

</h2>

<c:forEach var="row" items="${rs.rows}">

Foo ${row.foo}<br />

Bar ${row.bar}<br />

</c:forEach>

</body>

</html>

下面在啓動服務器，然後在瀏覽器中輸入http://localhost:8080/netshop/testpool.jsp.運行結果如下：

Results

Foo hello
Bar 12345

還有一點值得注意：

在MyEclipse的console中，顯示的服務器啓動信息是紅色的。而其他情況下的啓動信息則是黑色的。

自此，所有的配置過程都以完成，接下來就可以用jndi datasource開發了。

通過最近的一系列的配置，有所感悟，發現會的東西真的不難，但是自己搞的時候總會出現這樣或那樣的問題。

寫的時候總又覺得沒什麼好寫的。自己所發生的錯誤似乎都不是錯誤，也許什麼都沒有做，就又可以成功了。

讓人很不解。也許就是這樣吧！多習慣這樣也就好了。

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