BindException：地址已在客户端套接字上使用吗？

Question

我有一个客户端-服务器分层的体系结构，客户端向服务器发出类似RPC的请求。我正在使用Tomcat托管servlet，并使用Apache
HttpClient对其进行请求。

我的代码是这样的：

    private static final HttpConnectionManager CONN_MGR = new MultiThreadedHttpConnectionManager();
    final GetMethod get = new GetMethod();
    final HttpClient httpClient = new HttpClient(CONN_MGR);
    get.getParams().setCookiePolicy(CookiePolicy.IGNORE_COOKIES);
    get.getParams().setParameter(HttpMethodParams.USER_AGENT, USER_AGENT);

    get.setQueryString(encodedParams);
    int responseCode;
    try {
        responseCode = httpClient.executeMethod(get);
    } catch (final IOException e) {
        ...
    }
    if (responseCode != 200)
        throw new Exception(...);

    String responseHTML;
    try {
        responseHTML = get.getResponseBodyAsString(100*1024*1024);
    } catch (final IOException e) {
        ...
    }
    return responseHTML;

它在负载较轻的环境中效果很好，但是当我每秒发出数百个请求时，我开始看到这种情况-

Caused by: java.net.BindException: Address already in use
    at java.net.PlainSocketImpl.socketBind(Native Method)
    at java.net.AbstractPlainSocketImpl.bind(AbstractPlainSocketImpl.java:336)
    at java.net.Socket.bind(Socket.java:588)
    at java.net.Socket.<init>(Socket.java:387)
    at java.net.Socket.<init>(Socket.java:263)
    at org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:80)
    at org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:122)
    at org.apache.commons.httpclient.HttpConnection.open(HttpConnection.java:707)
    at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:387)
    at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171)
    at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)
    at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:323)

有关如何解决此问题的任何想法？我猜想这与客户端尝试重用临时客户端端口有关，但是为什么会这样/我该如何解决？谢谢！

Answer 1

事实证明，问题在于其他HttpClient实例之一意外地没有使用我实例化的MultiThreadedHttpConnectionManager，因此我实际上根本没有速率限制。解决此问题的方法解决了引发异常的问题。

不过，感谢所有建议！