Connection pooling 使用apache.DefaultHttpClient的Http连接进入时间\u等待未被重用

我们有一个HttpClient（apache.DefaultHttpClient）对象池（GenericObjectPool）。HttpPost对象通过这些客户端被放入以执行，这些客户端可能会同时发送Post请求。使用的协议是：带有keepalive的HTTP/1.1

在通过netstat进行负载测试期间，可以观察到新的套接字连接被不加区分地创建，而旧的连接被转到TIME\u WAIT

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日志摘录：-

[Worker-2] org.apache.http.impl.conn.Wire 63 - >> "POST /INBOX/4504a09e-13c0-3853-a285-9e2b9a22f65e/1e1e5a20-a8c1-11e2-99b8-7c19e9129271 HTTP/1.1[\r][\n]"

[Worker-2] org.apache.http.impl.conn.Wire 63 - >> "Content-Type: application/json; charset=UTF-8[\r][\n]"

[Worker-2] org.apache.http.impl.conn.Wire 63 - >> "Content-Length: 117[\r][\n]"

[Worker-2] org.apache.http.impl.conn.Wire 63 - >> "Host: rwcdtgxb0402:15010[\r][\n]"

[Worker-2] org.apache.http.impl.conn.Wire 63 - >> "Connection: Keep-Alive[\r][\n]"

[Worker-2] org.apache.http.impl.conn.Wire 63 - >> "User-Agent: Apache-HttpClient/4.2.1 (java 1.5)[\r][\n]"

[Worker-2] org.apache.http.impl.conn.Wire 63 - >> "[\r][\n]"

[Worker-2] org.apache.http.impl.conn.Wire 63 - << "HTTP/1.1 200 OK[\r][\n]"

[Worker-2] org.apache.http.impl.conn.Wire 63 - << "Content-Length: 0[\r][\n]"

[Worker-2] org.apache.http.impl.conn.Wire 63 - << "[\r][\n]"

[Worker-2] org.apache.http.impl.conn.DefaultClientConnection 254 - Receiving response: HTTP/1.1 200 OK

[Worker-2] org.apache.http.impl.conn.DefaultClientConnection 257 - << HTTP/1.1 200 OK

[Worker-2] org.apache.http.impl.conn.DefaultClientConnection 260 - << Content-Length: 0

[Worker-2] org.apache.http.impl.client.DefaultRequestDirector 540 - Connection can be kept alive indefinitely

**[Worker-2] org.apache.http.impl.conn.DefaultClientConnection 154 - Connection 0.0.0.0:51211<->192.168.88.172:15010 shut down**

[Worker-2] org.apache.http.impl.conn.BasicClientConnectionManager 189 - Releasing connection org.apache.http.impl.conn.ManagedClientConnectionImpl@12f65ce5

[Worker-2]org.apache.http.impl.conn.Wire 63->“POST/INBOX/4504a09e-13c0-3853-a285-9e2b9a22f65e/1e1e5a20-a8c1-11e2-99b8-7c19e9129271 http/1.1[\r][\n]”
[Worker-2]org.apache.http.impl.conn.Wire 63->>“内容类型：application/json；charset=UTF-8[\r][\n]”
[Worker-2]org.apache.http.impl.conn.Wire 63->>“内容长度：117[\r][\n]”
[Worker-2]org.apache.http.impl.conn.Wire 63->>“主机：rwcdtgxb0402:15010[\r][\n]”
[Worker-2]org.apache.http.impl.conn.Wire 63->>“连接：保持活动[\r][\n]”
[Worker-2]org.apache.http.impl.conn.Wire 63->>“用户代理：apache HttpClient/4.2.1（java 1.5）[\r][\n]”
[Worker-2]org.apache.http.impl.conn.Wire 63->>“[\r][\n]”
[Worker-2]org.apache.http.impl.conn.Wire 63-几天前解决了问题

错误：在HttpClient对象上调用releaseConnection（）。但是，避免它也不能解决问题

更正：
为保持连接处于活动状态（处于已建立状态）而采取的措施是通过以下示例代码：

HttpClient client = new org.apache.http.impl.client.DefaultHttpClient();
...
org.apache.http.HttpResponse response = client.executed(HttpPost) ;
org.apache.http.HttpEntity en = response.getEntity();
if (en != null) {
  en.getContent().close();
}

一旦收到HttpResponse，为了重用和维护创建的连接，只需关闭http响应上的InputStream（en.getContent（））。不要在HttpPost或客户端对象上调用任何其他发布方法

用JMeter负载测试了这个处理，发现它可以工作。还没有观察到任何副作用
 注意调用
EntityUtils.console（entity）
做得更多，应该使用：

    /**
     * Ensures that the entity content is fully consumed and 
     * the content stream, if exists, is closed.
     *
     * @param entity the entity to consume.
     * @throws IOException if an error occurs reading the input stream
     *
     * @since 4.1
     */
    public static void consume(final HttpEntity entity) throws IOException {
        if (entity == null) {
            return;
        }
        if (entity.isStreaming()) {
            final InputStream inStream = entity.getContent();
            if (inStream != null) {
                inStream.close();
            }
        }
    }

EntityUtils.consume（实体）也会这样做。
EntityUtils.consume（实体）
处理得更好，应该使用它，请参见我的答案