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Resin

让Resin HttpProxyServlet支持多域名

作者:anotherbug 日期:2008-06-09 00:39:38

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一般应用中有ajax进行跨子域代理调用时，通常需要设置HTTP代理，解决域的权限问题。
举例，blog.chinajavaworld.com中用ajax调search子系统的服务，Resin的HttpProxyServlet设置如下： 
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<servlet>
  <servlet-name>http-proxy</servlet-name>
  <servlet-class>com.caucho.servlets.HttpProxyServlet</servlet-class>
  <init host='search.chinajavaworld.com:80' />
</servlet> 
 
<servlet-mapping url-pattern="/ajax/search/*" servlet-name="http-proxy" />


在search.chinajavaworld.com/ajax/search/test.jsp中 
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<%out.print(request.getHeader("Host"));%>

现在访问：
http://blog.chinajavaworld.com/ajax/search/test.jsp，输出： 
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search.chinajavaworld.com


当应用要支持多域名访问时，问题来了：


如用 http://blog.chinajavaworld-bbb.com/ajax/search/test.jsp 进行访问，输出也是： 

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search.chinajavaworld.com

如果设置两个host 
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<servlet>
  <servlet-name>http-proxy</servlet-name>
  <servlet-class>com.caucho.servlets.HttpProxyServlet</servlet-class>
  <init host='search.chinajavaworld.com:80' />
  <init host='search.chinajavaworld-bbb.com:80' />
</servlet>

则用两个域名访问的话，都将输出： 
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search.chinajavaworld-bbb.com


现在的需求是，用哪个主域名访问的，就必须返回与该主域名一致的子域

解决方法：修改 HttpProxyServlet 源码：
TcpPool.java加入以下方法： 
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  public Server nextServer(String mainHost) {
Server bestServer = null;
synchronized (this) {
String _URL = null;
for (int i = 0; i < _servers.length; i++) {
Server server = _servers[i];
if (server.getURL().indexOf(mainHost) != -1) {
//System.out.println("ok,found host.return server.");
bestServer = server;
break;
}
if (i == _servers.length - 1)
  _URL = server.getURL();
}
if (bestServer == null) {
//System.out.println(mainHost+" is not in server list. add now.");
String oldMainHost = getMainDomain(_URL);
_URL = _URL.replace(oldMainHost, mainHost);
String _host = getDomain(_URL);
bestServer = new Server(_host);
_hosts.add(_host);
Server[] servers = new Server[_servers.length + 1]; 
System.arraycopy(_servers, 0, servers, 0, _servers.length);
servers[_servers.length] = bestServer;
_servers = servers;
}
return bestServer;
}
}


HttpProxyServlet中加入：

String host = req.getHeader("Host");
String mainHost = TcpPool.getMainDomain(host);


然后将

TcpPool.Server server = _tcpPool.nextServer();

替换为

TcpPool.Server server = _tcpPool.nextServer(mainHost);

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标签: Resin 多域名 HttpProxyServlet 
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