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    ?廢話不說，代碼說話：
    import?javax.naming.*;
    import?javax.naming.NamingException;
    import?javax.rmi.PortableRemoteObject;
    import?javax.ejb.EJBHome;
    import?javax.ejb.EJBLocalHome;
    import?javax.sql.DataSource;
    import?java.util.*;
    import?java.sql.*;

    /**
    ?*??實(shí)現(xiàn)?service?locater?模式，用于由客戶端來調(diào)用以通過JNDI查
    ?*??找相關(guān)的?ejb或是其它服務(wù)的入口.
    ?*?    */
    public?final?class?ServiceLocater?{

    ??    protected?static?ServiceLocater?inst?=?new?ServiceLocater();
    ??    private?InitialContext?ic?=?null;
    ??    private?Map?ejbHomeCache?=?null;
    ??    private?Map?dataSourceCache?=?null;
    ??    protected?ServiceLocater()?{
    ????    try?{
    ??????dataSourceCache?    =?Collections.synchronizedMap(new?HashMap());
    ??????ejbHomeCache?    =?Collections.synchronizedMap(new?HashMap());
    ??????ic?    =?new?InitialContext();
    ????}
    ????    catch?(Exception?e)?{
    ??????e.printStackTrace();
    ????}
    ??}

    ??    /**
    ???*?取得?servicelocater的單子實(shí)例.
    ???*?    */
    ??    synchronized?public?static?ServiceLocater?getInstance()?{
    ????    return?inst;
    ??}

    ??    /**
    ???*查找并返回一個(gè)數(shù)據(jù)源
    ???*?    @param?name?String?數(shù)據(jù)源名稱
    ???*?    @return?DataSource　，查找不到則拋出異常.
    ???*?    @throws?NamingException?，查找不到或是類型不對(duì)。
    ???*?    */
    ??    private?DataSource?lookUpDataSource(String?name)?throws?NamingException?{
    ????DataSource?tmpDS?    =?(DataSource)this.dataSourceCache.get(name);
    ????    if?(tmpDS?==?null)?{
    ??????    try?{
    ????????tmpDS?    =?(DataSource)this.ic.lookup(name);
    ????????    this.dataSourceCache.put(name,?tmpDS);
    ??????}
    ??????    catch?(NamingException?namE)?{
    ????????    throw?namE;
    ??????}
    ??????    catch?(Exception?otherE)?{
    ????????    throw?new?NamingException(otherE.getMessage());
    ??????}
    ????}
    ????    return?tmpDS;
    ??}

    ??    /**
    ???*?查找并返回一個(gè)遠(yuǎn)程接口
    ???*?    @param?jndiHomeName?ebj名字
    ???*?    @param?className??ejb類名字
    ???*?    @return
    ???*?    @throws?ServiceLocatorException
    ???    */
    ??    public?EJBHome?getRemoteHome(String?jndiHomeName,?Class?className)?throws
    ??????ServiceLocatorException?    {
    ????EJBHome?home?    =?(EJBHome)this.ejbHomeCache.get(jndiHomeName);
    ????    if?(home?==?null)?{
    ??????    try?{
    ????????Object?objref?    =?ic.lookup(jndiHomeName);
    ????????Object?obj?    =?PortableRemoteObject.narrow(objref,?className);
    ????????home?    =?(EJBHome)?obj;
    ????????    this.ejbHomeCache.put(jndiHomeName,?home);
    ??????}
    ??????    catch?(NamingException?ne)?{
    ????????    throw?new?ServiceLocatorException(ne);
    ??????}
    ??????    catch?(Exception?e)?{
    ????????    throw?new?ServiceLocatorException(e);
    ??????}
    ????}
    ????    return?home;
    ??}

    ??    /**
    ???*?查找并返回一個(gè)本地接口
    ???*?    @param?jndiHomeName??jndiHomeName名字
    ???*?    @return?一個(gè)本地接口
    ???*?    @throws?ServiceLocatorException
    ???    */
    ??    public?EJBLocalHome?getLocalHome(String?jndiHomeName)?throws
    ??????ServiceLocatorException?    {
    ????EJBLocalHome?home?    =?null;
    ????    try?{
    ??????home?    =?(EJBLocalHome)?ic.lookup(jndiHomeName);
    ????}
    ????    catch?(NamingException?ne)?{
    ??????    throw?new?ServiceLocatorException(ne);
    ????}
    ????    catch?(Exception?e)?{
    ??????    throw?new?ServiceLocatorException(e);
    ????}
    ????    return?home;

    ??}

    ??    /**
    ???*查找一個(gè)數(shù)據(jù)源，并取得一個(gè)連接.
    ???*?    @param?name?String?數(shù)據(jù)源名稱
    ???*?    @return?DataSource　，查找不到則拋出異常.
    ???*?    @throws?NamingException?，查找不到或是類型不對(duì)。
    ???*?    */
    ??    public?Connection?getConnection(String?DataSourceJNDIName)?throws
    ??????SQLException?    {
    ????    try?{
    ??????Connection?conn?    =?this.lookUpDataSource(DataSourceJNDIName).getConnection();
    ??????conn.setAutoCommit(    false);
    ??????    //conn.setTransactionIsolation(Connection.TRANSACTION_READ_COMMITTED);
    ??????return?conn;
    ????}
    ????    catch?(Exception?e)?{
    ??????e.printStackTrace();
    ??????    throw?new?SQLException(e.getMessage());
    ????}
    ??}

    }
    
	
    
	


    
	    
    




    








    

				
			
    
		    		
	
    
	
    
		
			


		
	
    

    


    







    
        
	



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