【原创】Java HttpClient&nbs…

Java HttpClient Raise Error: Connection http://www.xxx.com refused

在 Android 上运行 jar,目的是从服务器一直获取消息, 使用 HTTP 服务.

但是每次启动进程, 当请求次数达到1010 时候, 总是会报错: Connection http://www.xxx.com refused
很规律, 每次当请求1000次左右的时候就全挂了.

杀掉进程重新启动, 一切正常,1000次后又是连接被重置.

检查 HTTP 服务, 用 PC 访问API 正常, 在 Android 上用浏览器访问, API 也正常. 可以确认服务是正常的, 并不是服务器拒绝连接.

adb shell  logcat -c #  清除手机的 logadb shell logcat

通过手机查看 log, 发现了错误提示:… -EMFILE (Too many open files) …

原因是: socket连接太多, Android本地拒绝连接服务.

有 httpGet/HttpPostclose()/releaseCollection()

有httpClient.getConnectionManager()closeExpiredConnections()/shutdown()

HttpGetclose()/releaseCollection 只是虚函数, 没有实例函数, 并不能用.

正确的方式是

httpClient.getConnectionManager().closeExpiredConnections()httpClient.getConnectionManager().shutdown()

代码如下

     public static String get(String URL, Map params) {        String result = "";        String URI = setParams(params);        // System.out.println(URL + "?" + URI);        httpGet = new HttpGet(URL + "?" + URI);        HttpClient httpClient = new DefaultHttpClient();        httpClient.getParams().setIntParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, CONNECTION_TIMEOUT);        httpClient.getParams().setIntParameter(CoreConnectionPNames.SO_TIMEOUT, SOCKET_TIMEOUT);        httpClient.getParams().setLongParameter(ConnManagerPNames.TIMEOUT, MCC_TIMEOUT);        httpClient.getParams().setLongParameter(ConnManagerPNames.MAX_TOTAL_CONNECTIONS, 256);        HttpResponse response = null;        try {            response = httpClient.execute(httpGet);        } catch (Exception e) {            Logger.getLogger(Configure.loggerName).severe(Configure.logTag                    + String.format("[COUNT: %s] Download failed, url: %s, uri:%s error: %s", COUNT, URL, URI, e.getMessage()));            httpClient.getConnectionManager().closeExpiredConnections();            httpClient.getConnectionManager().shutdown();            //httpGet.close();            //httpGet.releaseConnection();            //e.printStackTrace();            return result;        }        try {            HttpEntity httpEntity = response.getEntity();            InputStream inputStream = httpEntity.getContent();            BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));            String line = "";            while (null != (line = reader.readLine())) {                result += (line + "\n");            }            // System.out.println(result);            inputStream.close();            reader.close();            httpClient.getConnectionManager().closeExpiredConnections();            httpClient.getConnectionManager().shutdown();            // httpGet.close();            // httpGet.releaseConnection();        } catch (Exception e) {            Logger.getLogger(Configure.loggerName).severe(Configure.logTag                    + String.format("Download read response failed, url: %s error: %s", URL, e.getMessage()));            // e.printStackTrace();        }        return result;    }

参考

java.net.SocketException: Too many open files

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