如何检查天气客户端是否在 java 中使用 PoolingHttpClientConnectionManager

Question

我正在尝试通过我正在使用的客户端代码在服务器上使用连接池（已配置 Https SSL） PoolingHttpClientConnectionManager 和我有一个带连接池的工作代码，但我想知道我的代码是否正在使用 PoolingHttpClientConnectionManager 如何弄清楚

如果我的代码没有使用池管理器如何让它使用它

我的代码：

static PoolingHttpClientConnectionManager cm ;
    static CloseableHttpClient httpClient;
    static
    {


        SslConfigurator sslConfig = SslConfigurator.newInstance()
                .securityProtocol("TLS")
                .keyStoreFile("/path")
                .keyStorePassword("passw")
                .keyStoreType("JKS")
                .trustStoreFile("/path");

        SSLContext sslCtx = sslConfig.createSSLContext();
        SSLConnectionSocketFactory sslSocketFactory = new SSLConnectionSocketFactory(sslCtx,NoopHostnameVerifier.INSTANCE);
        HttpClientContext clientContext = HttpClientContext.create();


        final Registry<ConnectionSocketFactory> registry = RegistryBuilder.<ConnectionSocketFactory> create()
                .register("http", PlainConnectionSocketFactory.getSocketFactory())
                .register("https", sslSocketFactory)
                .build();


        cm = new PoolingHttpClientConnectionManager(registry);

        client = HttpClients.custom()
                .setSSLSocketFactory(sslSocketFactory)
                .setConnectionManager(cm)
                .build();

    }
    public static void main(String a[]) throws ClientProtocolException, IOException, JSONException
    {

        JSONObject jsonResponse;




         StringEntity se = new StringEntity(jsonRequest.toString());

        HttpPost httpPost = new HttpPost(path);
        httpPost.setEntity(se);
        httpPost.setHeader("Accept", "application/json");
        httpPost.setHeader("Content-type", "application/json");
        httpPost.setHeader("Connection", "keep-alive");
        CloseableHttpResponse response2; 
        DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss:SSS");



        int i;
        for(i=0;i<10;i++)
       {
            response2 = client.execute(httpPost);

        System.out.println(response2.getStatusLine());
        HttpEntity entity2 = response2.getEntity();

        String result = EntityUtils.toString(entity2);
        System.out.println(result);

        Date date = new Date();
        System.out.println(dateFormat.format(date));
       response2.close();
       }

    }

Answer 1

面对如此复杂的问题，这里有一些经验法则...

创建一个简单的 class，比如 'BrokenPHCCM'，它扩展了 org.apache.http.impl.conn.PoolingHttpClientConnectionManager，在这个新的 class 中，只需重写 org.apache.http.impl.conn.PoolingHttpClientConnectionManager#connect 方法，基本上抛出一个java.lang.RuntimeException 而不是。

当您要将此类型的实例传递给 http 客户端构建器 .setConnectionManager(brokenCM) 并尝试连接时，您应该得到运行时异常，对吗？

下面是我的简化版本

public static class BrokenPoolingHttpClientConnectionManager
          extends PoolingHttpClientConnectionManager 
{

    public BrokenPoolingHttpClientConnectionManager(
            Registry<ConnectionSocketFactory> socketFactoryRegistry) {

        super(socketFactoryRegistry);
    }

    @Override
    public void connect(
                    HttpClientConnection managedConn, 
                    HttpRoute route, 
                    int connectTimeout, 
                    HttpContext context) throws IOException  {

        throw new RuntimeException("As expected");
    }
}

static PoolingHttpClientConnectionManager cm;
static CloseableHttpClient httpClient;

static {

        HttpClientContext clientContext = HttpClientContext.create();

        final Registry<ConnectionSocketFactory>
            registry =
            RegistryBuilder.<ConnectionSocketFactory>create()
                .register("http", PlainConnectionSocketFactory.getSocketFactory())
                .build();

        cm = new BrokenPoolingHttpClientConnectionManager(registry);

        httpClient = HttpClients.custom()
            .setConnectionManager(cm)
            .build();

}


public static void main(String a[]) throws ClientProtocolException, IOException, JSONException {

        HttpGet httpRequest = new HttpGet("http://www.google.com/");
        httpRequest.setHeader("Connection", "keep-alive");
        CloseableHttpResponse response2;
        DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss:SSS");

        int i;
        for (i = 0; i < 10; i++) {
          response2 = httpClient.execute(httpRequest);

          System.out.println(String.format("response status=%s", response2.getStatusLine()));

          String result = EntityUtils.toString(response2.getEntity());
          System.out.println(String.format("response size=%d", result.length()));

          Date date = new Date();
          System.out.println(dateFormat.format(date));
          response2.close();
        }
}

您的控制台将显示如下内容：

Exception in thread "main" java.lang.RuntimeException: As expected at com.something.Demo$BrokenPoolingHttpClientConnectionManager.connect(Demo.java:43) at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:363) at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:219) at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:195) at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:86) at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:108) at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:184) at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82) at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:106) at com.something.Demo.main(Demo.java:78) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)

除此之外，您应该依赖文档和其他内容，例如 java 的静态类型方面:)

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