上面一篇关于连接超时的文章，就是由于axis2客户端实现导致，下面是我用测试代码（启了4个线程，每个线程做4次调用）运行过程中的抓包：
可以看到，每次调用都会新建立一个连接，无法重用
优化了一下，下面是修改过后的代码运行的抓包
连接都被重用了
下面是实现代码片段：
private static ConfigurationContext defaultConfigurationContext = createDefaultConfigurationContext();
private static ConfigurationContext createDefaultConfigurationContext(){
// reuse HTTP connections if possible.
MultiThreadedHttpConnectionManager mgr = new MultiThreadedHttpConnectionManager();
HttpConnectionManagerParams params = mgr.getParams();
if (params == null) {
params = new HttpConnectionManagerParams();
mgr.setParams(params);
}
params.setMaxTotalConnections(40);
params.setDefaultMaxConnectionsPerHost(20);
IdleConnectionTimeoutThread ict = new IdleConnectionTimeoutThread();
ict.addConnectionManager(mgr);
ict.setConnectionTimeout(15000);
ict.start();
HttpClient httpClient = new HttpClient(mgr);
ConfigurationContext defaultConfigurationContext = null;
try {
defaultConfigurationContext = ConfigurationContextFactory.createDefaultConfigurationContext();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
defaultConfigurationContext.setProperty(HTTPConstants.CACHED_HTTP_CLIENT, httpClient);
return defaultConfigurationContext;
}
...
ServiceClient sender = new ServiceClient(defaultConfigurationContext,null);
OMElement result = sender.sendReceive(method);
sender.cleanupTransport();