2016-05-25 08:58:34
昨天线上小白系统因为调用外部http接口，超时不释放，导致页面反应很慢，时间一长，报502错误。
上网查了下，502错误是因为服务对于客户的请求没有得到及时的反应，查询日志，发现很多调http接口异常，页面反应也很慢。
瞬间想到缩短http客户端调用http接口的超时时间，搜到这个博客http://blog.csdn.net/xinying0424/article/details/36006383 感谢
HttpClient 4：
连接超时： 连接超时
httpclient.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT,60000);
// 或者
HttpConnectionParams.setConnectionTimeout(params,6000);
读取超时： httpclient.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT,60000);
// 或者
HttpConnectionParams.setSoTimeout(params,60000);
HttpClient 3：
连接超时：
httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(60000);
读取超时：
httpClient.getHttpConnectionManager().getParams().setSoTimeout(60000);
发现我本来代码里就写了这个，只是时间配置的实在太长
private static MultiThreadedHttpConnectionManager connectionManager = null;
private static int connectionTimeOut = 2000;t
private static int socketTimeOut = 10000;
private static int maxConnectionPerHost = 20;
private static int maxTotalConnections = 20;
private static HttpClient client; static {
connectionManager = new MultiThreadedHttpConnectionManager();
connectionManager.getParams().setConnectionTimeout(connectionTimeOut);
connectionManager.getParams().setSoTimeout(socketTimeOut);
connectionManager.getParams().setDefaultMaxConnectionsPerHost(maxConnectionPerHost);
connectionManager.getParams().setMaxTotalConnections(maxTotalConnections);
client = new HttpClient(connectionManager);
}
然后我把socketTimeOut调整为2000，本地想测试下，结果。。。
java.lang.IllegalArgumentException: host parameter is null 调用接口报错
查了下 http://wang371134086.iteye.com/blog/1688458 竟然调用http接口没写http://，加上这段解决
问题解决记录下，感谢一下博客。
http://blog.csdn.net/xinying0424/article/details/36006383
http://wang371134086.iteye.com/blog/1688458
http://blog.sina.com.cn/s/blog_a577563c01013tlz.html
http://jinnianshilongnian.iteye.com/blog/2089792
http://www.zhihu.com/question/21647204