Tomcat数据库连接池配置 【转载】

这里以MySQL为例：

首先是conf目录下的server.xml

GlobalNamingResources中添加：

<Resource

name="java/mysql/test
"

type="javax.sql.DataSource"

password="root"

driverClassName="com.mysql.jdbc.Driver"

maxIdle="2"

maxWait="5000"

username="root"

url="jdbc:mysql://127.0.0.1:3306/test"

maxActive="20"/>

在content.xml中添加：

<ResourceLink

name="java/mysql/test
"

type="javax.sql.DataSource"

global="java/mysql"/>

由于定义的是global的，所以不需要
在所在应用中的web.xml中添加：

<resource-ref>

<description>MySQL DB Connection Pool</description>

<res-ref-name>java/mysql/test
</res-ref-name>

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

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

<res-sharing-scope>Shareable</res-sharing-scope>

</resource-ref>

注意保持黑体部分的一致性，这样在程序中就可以使用了：

import java.io.Serializable;

import java.sql.*;

import javax.naming.InitialContext;

import javax.naming.NamingException;

import javax.rmi.PortableRemoteObject;

import javax.sql.DataSource;

public class ConnectionPool implements Serializable{

private String URI = "java:comp/env/java/mysql";

private DataSource dataSource;

private static ConnectionPool connectionpool;

private Connection connection;

private InitialContext getInitialContext()throws NamingException{

return new InitialContext();

}

public Connection getConnection()throws NamingException, SQLException{

if(dataSource == null){

InitialContext initialcontext = getInitialContext();

Object obj = initialcontext.lookup(URI);

dataSource = (DataSource)PortableRemoteObject.narrow(obj, javax.sql.DataSource.class);

initialcontext.close();

}

connection = dataSource.getConnection();

return connection;

}

public static void main(String[] args) {

try{

Connection con = connectionpool.getConnection();//获取连接

PreparedStatement pst = con

.prepareStatement("select count(*) from test.user;");

ResultSet rs = pst.executeQuery();

while(rs.next()){

System.out.println(rs.getString(1));

}

} catch (Exception e) {

e.printStackTrace();

}

connectionpool.close();

}

public void close(){

try {

connection.close();

} catch (Exception e) {

e.printStackTrace();

}

}