在Tomcat中配配置数据源汇总

Tomcat本身不具备处理提供数据源的能力。借助于一些开源数据源实现,如:DBCP和C3P0等。

一、在http://commons.apache.org/可下载这些是Tomcat提供配置数据源所需的类库。
注意:Tomcat5.5以上标准版本自带dbcp,放在$Tomcat\common\lib目录;

下载三个文件后,将三个文件解压到Tomcat/common/lib,
1.The DBCP Component
commons-dbcp-1.2.1.jar
http://commons.apache.org/dbcp/

2.The Pool Component 1.2.jar
commons-pool-1.2.jar
http://commons.apache.org/pool/

3.Commons Collections 3.1
commons-collections-3.1.jar
http://commons.apache.org/collections/


There are several examples  of using DBCP available.
http://svn.apache.org/viewvc/commons/proper/dbcp/trunk/doc/

4、把数据库JDBC驱动拷贝到%TOMCAT_HOME%/common/lib和
                           %TOMCAT_HOME%/webapps/yourweb/WEB-INF/lib下(我的web文件夹名字叫quickstart)

二、

    1.  SQL server2000
 <Resource
   name="jdbc/quickstart"
  type="javax.sql.DataSource"
  password="123456"
  driverClassName="com.microsoft.jdbc.sqlserver.SQLServerDriver"
  maxIdle="2"
  maxWait="5000"
  username="sa"
  url="jdbc:microsoft:sqlserver://localhost;DatabaseName=quickstart"   maxActive="4"/>


   2.MySQL
     <Resource    
                 name="jdbc/hnport"
                type="javax.sql.DataSource"
                password="sharker"
                driverClassName="com.mysql.jdbc.Driver"
                maxIdle="2"
                maxWait="5000"
                username="root"
                url="jdbc:mysql://localhost:3306/hnport"
                maxActive="4"/>


三、按数据源使用范围来分数据源配置两个方法:

方法一:所用Web可使用(全局数据源)
 
  1、修改%TOMCAT_HOME%/conf/server.xml文件,在<GlobalNamingResources></GlobalNamingResources>之间加入如下代码:
             < Resource    
                 name ="jdbc/hnport"
                 type ="javax.sql.DataSource"
                 password ="sharker"
                 driverClassName ="com.mysql.jdbc.Driver"
                 maxIdle ="2"
                 maxWait ="5000"
                 username ="root"
                 url ="jdbc:mysql://localhost:3306/hnport"
                 maxActive ="4" />

  2、修改%TOMCAT_HOME%/webapps/yourweb/WEB-INF下的web.xml文件,在<web-app></web-app>之间添加以下内容
   
   < resource-ref >
   < description >mysql Connection </ description >
   < res-ref-name >jdbc/hnport </ res-ref-name >
   < res-type >javax.sql.DataSource </ res-type >
   < res-auth >Container </ res-auth >
   </ resource-ref >


 3、在%TOMCAT_HOME%/conf/Catalina/localhost下新建一个与你web文件夹同名的xml文件(我的是quickstart.xml)
  
  这一步非常重要,如果没有这步就会出错,会出现org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null'

<? xml version ="1.0" encoding ="UTF-8" ?>
< Context path ="/hnport" reloadable ="true" docBase ="d:\hnport\WebRoot" workDir ="d:\hnport\work" >
     < Resource name ="jdbc/hnport"
     type ="javax.sql.DataSource"
     password ="sharker"
     driverClassName ="com.mysql.jdbc.Driver"
     maxIdle ="2"
     maxWait ="5000"
     username ="root"
     url ="jdbc:mysql://localhost:3306/hnport"
     maxActive ="4" />
</ Context >

方法二:只有某个Web可用(局部数据源
        1.该方法不会造成系统混乱,只需修改%TOMCAT_CAT%\conf\Cattalin\localhost下的Web配置文件。如:hnport.xml

<? xml version ="1.0" encoding ="UTF-8" ?>
< Context path ="/hnport" reloadable ="true" docBase ="d:\hnport\WebRoot" workDir ="d:\hnport\work" >
     < Resource name ="jdbc/hnport"
     type ="javax.sql.DataSource"
     password ="sharker"
     driverClassName ="com.mysql.jdbc.Driver"
     maxIdle ="2"
     maxWait ="5000"
     username ="root"
     url ="jdbc:mysql://localhost:3306/hnport"
     maxActive ="4" />
</ Context >



 2 、修改 %TOMCAT_HOME%/webapps/yourweb/WEB-INF 下的 web.xml 文件 , <web-app> </web-app> 之间添加以下内容
  
   < resource-ref >
   < description >mysql Connection </ description >
   < res-ref-name >jdbc/hnport </ res-ref-name >
   < res-type >javax.sql.DataSource </ res-type >
   < res-auth >Container </ res-auth >
   </ resource-ref >

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四.测试
<% @page contentType="text/html;charset=big5"%>    
<% @page import="java.sql.*"%>    
<% @page import="javax.sql.*" %>    
<% @page import="javax.naming.*" %>    
<%    
        try {    
                Context initContext = new InitialContext();    
                Context envContext    =    
                        (Context)initContext.lookup("java:/comp/env");    
                DataSource ds =    
                        (DataSource)envContext.lookup("jdbc/hnport");    
                Connection conn = ds.getConnection();    
    
                if(!conn.isClosed())    
                        
                        out.println("数据库连接测试成功");    
                conn.close();    
        }    
        catch(SQLException e) {    
                out.println(e.toString());    
        }
%>

 

本文出自 “乔磊的博客 学习 进步” 博客,请务必保留此出处http://sucre.blog.51cto.com/1084905/360048

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