tomcat jndi 数据源 配置的一个例子

（1） "C:/Program Files/apache-tomcat-5.5.25/conf/Catalina/localhost/testDBConnection.xml"

<?xml version='1.0' encoding='utf-8'?>
<Context crossContext="true" docBase="c:/eclipse/workspace/testDBConnection" path="/testDBConnection" workDir="C:/eclipse/workspace/testDBConnection/work">
  <Resource name="jdbc/test" auth="Container" type="javax.sql.DataSource"
    username="root" password="123456"
    driverClassName="com.mysql.jdbc.Driver"
    url="jdbc:mysql://localhost/test"
    maxActive="20" maxIdle="10" maxWait="10000" />
</Context>

（2）web.xml

<?xml version="1.0" encoding="ISO-8859-1"?>
<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">
    <servlet>
     <servlet-name>SelectCityServlet</servlet-name>
     <servlet-class>com.stephen.servlet.SelectCityServlet</servlet-class>
    </servlet>
    <servlet>
     <servlet-name>testJsp</servlet-name>
     <jsp-file>/index1.jsp</jsp-file>
     <init-param>
      <param-name>email</param-name>
      <param-value>[email protected]</param-value>
     </init-param>
    </servlet>
    <servlet>
     <servlet-name>RefreshModelListServlet</servlet-name>
     <servlet-class>com.stephen.servlet.RefreshModelListServlet</servlet-class>
    </servlet>
    <servlet>
     <servlet-name>DynamicUpdateServlet</servlet-name>
     <servlet-class>com.stephen.servlet.DynamicUpdateServlet</servlet-class>
    </servlet>
    <servlet-mapping>
     <servlet-name>SelectCityServlet</servlet-name>
     <url-pattern>/SelectCityServlet</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
     <servlet-name>testJsp</servlet-name>
     <url-pattern>/index1.jsp</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
     <servlet-name>RefreshModelListServlet</servlet-name>
     <url-pattern>/RefreshModelListServlet</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
     <servlet-name>DynamicUpdateServlet</servlet-name>
     <url-pattern>/DynamicUpdateServlet</url-pattern>
    </servlet-mapping>
    <session-config>
        <session-timeout>30</session-timeout>
    </session-config>
 <context-param>
  <param-name>email</param-name>
  <param-value>[email protected]</param-value>
 </context-param>
 <listener>
  <listener-class>com.Listener.MyServletContextListener</listener-class>
 </listener>
 <!--forbid scriptlet :true <jsp-config> element is limited to 1 occurance-->
 <jsp-config>
  <jsp-property-group>
   <url-pattern>*.jsp</url-pattern>
   <el-ignored>false</el-ignored>
   <scripting-invalid>false</scripting-invalid>
  </jsp-property-group>
 </jsp-config>
 <!--forbid expression language :true
 <jsp-config>
  <jsp-property-group>
   <url-pattern>*jsp</url-pattern>
   <el-ignored>false</el-ignored>
  </jsp-property-group>
 </jsp-config>-->
    <welcome-file-list>
        <welcome-file>index1.jsp</welcome-file>
        <!--<welcome-file>jsp/handleit.jsp</welcome-file>-->
    </welcome-file-list>
   
    <error-page>
     <error-code>404</error-code>
     <location>/404Notfound.jsp</location>
    </error-page>
    
 <resource-ref>
  <res-ref-name>jdbc/test</res-ref-name>
  <res-type>javax.sql.DataSource</res-type>
  <res-auth>Container</res-auth>
 </resource-ref>

</web-app>

 

（3）DbAccessor.java

package com.db;

import java.sql.Connection;
import java.sql.SQLException;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;

/*
 * 作成日: 2009/05/04
 *
 */

/**
 * @author hx0331
 * 
 */
public class DbAccessor
{
    public static DataSource getResult()
    {
        DataSource result = null;

        Context initContext = null;
        try
        {
            initContext = new InitialContext();
            result = (DataSource) initContext.lookup("java:comp/env/jdbc/test");

            //            Context envContext =
            // (Context)initContext.lookup("java:comp/env");
            //            // 找到DataSource
            //            result = (DataSource)envContext.lookup("jdbc/mysql");
        }
        catch (NamingException e)
        {
            e.printStackTrace();
        }
        finally
        {
            if (initContext != null)
            {
                try
                {
                    initContext.close();
                }
                catch (NamingException e1)
                {
                    e1.printStackTrace();
                }
            }
        }

        return result;
    }

    public static Connection getConnection()
    {
        Connection conn = null;

        try
        {
            conn = getResult().getConnection();
        }
        catch (SQLException e)
        {
            e.printStackTrace();
        }

        return conn;
    }

    public static void rollback(Connection conn)
    {
        try
        {
            conn.rollback();
        }
        catch (SQLException e)
        {
            e.printStackTrace();
        }
    }
}

 

（4）sqlMaker.java

 

/*
 * 作成日: 2009/05/19
 */
package com.db;

/**
 * @author hx0331
 *
 */
public class sqlMaker
{
    public static String getNameByStuID()
    {
        StringBuffer sb = new StringBuffer();
        sb.append("select *");
        sb.append(" from a");
        sb.append(" where stuID=?");
       
        return sb.toString();
    }
}

（5）SelectCityServlet.java

package com.stephen.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.db.DbAccessor;
import com.db.sqlMaker;

public class SelectCityServlet extends HttpServlet
{
    public SelectCityServlet()
    {
        super();
    }

    public void destroy()
    {
        super.destroy();
    }

    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    {
        response.setContentType("text/xml");
        response.setHeader("Cache-Control", "no-cache");
        String state = request.getParameter("state");
        StringBuffer sb = new StringBuffer("<state>");
       
//this.getServletConfig().getInitParameter("aa");
//this.getServletConfig().getServletContext().getInitParameter("aa");
//this.getServletContext().getInitParameter("dd");
//this.

        Connection conn = DbAccessor.getConnection();

        if ("zj".equals(state))
        {
            try
            {
                if (conn != null)
                {
                    conn.setAutoCommit(false);

                    PreparedStatement statement = conn.prepareStatement(sqlMaker.getNameByStuID(), ResultSet.TYPE_SCROLL_INSENSITIVE,
                            ResultSet.CONCUR_READ_ONLY);

                    statement.setString(1, "111");
                    ResultSet rs = statement.executeQuery();

                    while (rs.next())
                    {
                        sb.append("<city>");
                        sb.append(rs.getString("Name"));
                        sb.append("</city>");
                    }

                    conn.commit();   
                }

            }
            catch (SQLException e)
            {
                e.printStackTrace();
            }
            finally
            {
                try
                {
                    conn.rollback();
                    conn.setAutoCommit(true);
                }
                catch (SQLException e)
                {
                    e.printStackTrace();
                }
            }
        }
        else if ("zs".equals(state))
        {
            sb.append("<city>");
            sb.append("nanjing");
            sb.append("</city>");
            sb.append("<city>");
            sb.append("yangzhou");
            sb.append("</city>");
            sb.append("<city>");
            sb.append("suzhou");
            sb.append("</city>");
        }
        sb.append("</state>");

        PrintWriter out = response.getWriter();
        out.write(sb.toString());
        out.close();
    }

}

 

（6）index.jsp

<html>
<head>
<title>MyHtml.html</title>

<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="this is my page">

<!--<link rel="stylesheet" type="text/css" href="./styles.css">-->

</head>
<script type="text/javascript">

function getResult(stateVal)
{
 var url = "SelectCityServlet?state="+stateVal;

 if (window.XMLHttpRequest)
 {
  req = new XMLHttpRequest();
 }
 else if (window.ActiveXObject)
 {
  req = new ActiveXObject("Microsoft.XMLHTTP");
 }
 if(req)
 {
  req.open("GET",url, true);
  req.onreadystatechange = complete;
  req.send(null);
 }
}

function complete()
{
 if (req.readyState == 4)
 {
  if (req.status == 200)
  {
   var city = req.responseXML.getElementsByTagName("city");
   <!--file://alert(city.length);-->
   var str=new Array();
   for(var i=0;i<city.length;i++)
   {
    str[i]=city[i].firstChild.data;
   }
   <!--file://alert(document.getElementById("city"));-->
   buildSelect(str,document.getElementById("city"));
  }
 }
}

function buildSelect(str,sel)
{
 sel.options.length=0;
 for(var i=0;i<str.length;i++)
 {
  sel.options[sel.options.length]=new Option(str[i],str[i])
 }
}

</script>
<body>
 
 <select name="state" onChange="getResult(this.value)">
  <option value="">Select</option>>
  <option value="zj">ZEHJIANG</option>>
  <option value="zs">JIANGSU</option>>
 </select>
 
 <select id="city">
  <option value="">CITY</option>
 </select>
</body>
</html>

-------------------------------------------------------------------------------2011-08-01追加

补充方法2

修改D:\java\tomcat5.0_test\conf\server.xml

<?xml version='1.0' encoding='utf-8'?>
<Server>
  <Listener className="org.apache.catalina.mbeans.ServerLifecycleListener"/>
  <Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener"/>
  <GlobalNamingResources>
    <Environment name="simpleValue" type="java.lang.Integer" value="30"/>
    <Resource auth="Container" description="User database that can be updated and saved" name="UserDatabase" type="org.apache.catalina.UserDatabase"/>
    <Resource name="DS_SERVER" type="javax.sql.DataSource"/>
    <ResourceParams name="UserDatabase">
      <parameter>
        <name>factory</name>
        <value>org.apache.catalina.users.MemoryUserDatabaseFactory</value>
      </parameter>
      <parameter>
        <name>pathname</name>
        <value>conf/tomcat-users.xml</value>
      </parameter>
    </ResourceParams>
<ResourceParams name="DS_SERVER">
      <parameter>
        <name>maxWait</name>
        <value>5000</value>
      </parameter>
      <parameter>
        <name>maxActive</name>
        <value>4</value>
      </parameter>
      <parameter>
        <!--<name>password</name>
        <value>useroper</value>-->
        <name>password</name>
        <value>test</value>
      </parameter>
      <parameter>
        <name>url</name>
        <!--<value>jdbc:sybase:Tds:127.0.0.1:8888?charset=eucgb</value>-->
        <value>jdbc:oracle:thin:@localhost:1521:test</value>
      </parameter>
      <parameter>
        <name>driverClassName</name>
        <!--<value>com.sybase.jdbc2.jdbc.SybDriver</value>-->
        <value>oracle.jdbc.OracleDriver</value>
      </parameter>
      <parameter>
        <name>maxIdle</name>
        <value>2</value>
      </parameter>
      <parameter>
        <name>username</name>
        <value>test</value>
      </parameter>
    </ResourceParams>
  </GlobalNamingResources>
  <Service name="Catalina">
    <Connector acceptCount="100" connectionTimeout="20000" disableUploadTimeout="true" port="8080" redirectPort="8443" maxSpareThreads="75" maxThreads="150" minSpareThreads="25" useBodyEncodingForURI="true" URIEncoding="GBK">
    </Connector>
    <Connector port="8009" protocol="AJP/1.3" protocolHandlerClassName="org.apache.jk.server.JkCoyoteHandler" redirectPort="8443">
    </Connector>
    <Engine defaultHost="localhost" name="Catalina">
      <Host appBase="webapps" name="localhost">
        <Logger className="org.apache.catalina.logger.FileLogger" prefix="localhost_log." suffix=".txt" timestamp="true"/>
        <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs" prefix="access." suffix=".log" pattern="common" resolveHosts="false"/>
        
        <Context docBase="D:/workspace/management/webapps" path="/management" reloadable="true">
        <ResourceLink global="DS_SERVER" name="DS_SERVER" type="javax.sql.DataSource"/>
        </Context>
        
      </Host>
      <Logger className="org.apache.catalina.logger.FileLogger" prefix="catalina_log." suffix=".txt" timestamp="true"/>
      <Realm className="org.apache.catalina.realm.UserDatabaseRealm"/>
    </Engine>
  </Service>
</Server>

 以上配置，就可以配置好了，jndi数据库数据源了。