1. 配置tomcat下的conf下的context.xml文件,在之間添加連接池配置:  
<Resource name="jdbc/oracle"             

auth="Container"                 

 type="javax.sql.DataSource"                

 driverClassName="oracle.jdbc.driver.OracleDriver"   驅(qū)動(dòng)類名        
url=" jdbc:oracle:thin:@host:port:databse"      連接字符串         
username=" user "               
password="password"               
maxActive="100"     表示最大活動(dòng)連接數(shù)          
maxIdle="30"         表示最大保留連接數(shù)     
maxWait="10000" />    表示最大等待時(shí)間
2. 配置你的應(yīng)用下的web.xml中的之間加入  
<resource-ref>             
  <description>DB Connection</description>            
  <res-ref-name>jdbc/oracle</res-ref-name>            
  <res-type>javax.sql.DataSource</res-type>            
  <res-auth>Container</res-auth>      
</resource-ref>  
3.把連接數(shù)據(jù)庫的第三方驅(qū)動(dòng)放到common/lib下面就ok了
4.import javax.naming.InitialContext;
import javax.sql.DataSource;
public class Test1 {
    public static Connection getConn()
    {
       Connection conn = null;
        Context initContext;
       try {
           initContext = new InitialContext();
           DataSource ds  = (DataSource)initContext.lookup("java:comp/env/jdbc/oracle");
           conn = ds.getConnection();
       } catch (Exception e) {
           e.printStackTrace();
       }
       return conn;
    } 

5.private static final ResourceBundle dataResources =ResourceBundle.getBundle("com.langchao.se.properties.database",Locale.getDefault());