轻松把玩HttpAsyncClient之模拟post请求示例

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如果看到过我前些天写过的《轻松把玩HttpClient之模拟post请求示例》这篇文章，你再看本文就是小菜一碟了，如果你顺便懂一些NIO，基本上是毫无压力了。因为HttpAsyncClient相对于HttpClient，就多了一个NIO，这也是为什么支持异步的原因。

不过我有一个疑问，虽说NIO是同步非阻塞IO，但是HttpAsyncClient提供了回调的机制，这点儿跟netty很像，所以可以模拟类似于AIO的效果。但是官网上的例子却基本上都是使用Future future = httpclient.execute(request, null);来同步获得执行结果。

好吧，反正我是用回调的方式实现的。代码基本上跟httpClient那篇一致。不一样的地方主要有这么2个地方：配置ssl时不一样；调用execute方式时，使用回调。具体代码如下：

 package com.tgb.ccl.http.simpledemo;

 import java.io.File;
 import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.io.Reader;
 import java.security.KeyManagementException;
 import java.security.KeyStore;
 import java.security.KeyStoreException;
 import java.security.NoSuchAlgorithmException;
 import java.security.cert.CertificateException;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;

 import javax.net.ssl.SSLContext;
 import javax.net.ssl.TrustManager;
 import javax.net.ssl.X509TrustManager;

 import org.apache.http.HttpEntity;
 import org.apache.http.HttpHost;
 import org.apache.http.HttpResponse;
 import org.apache.http.NameValuePair;
 import org.apache.http.ParseException;
 import org.apache.http.client.ClientProtocolException;
 import org.apache.http.client.entity.UrlEncodedFormEntity;
 import org.apache.http.client.methods.HttpPost;
 import org.apache.http.concurrent.FutureCallback;
 import org.apache.http.config.Registry;
 import org.apache.http.config.RegistryBuilder;
 import org.apache.http.conn.ssl.TrustSelfSignedStrategy;
 import org.apache.http.impl.conn.DefaultProxyRoutePlanner;
 import org.apache.http.impl.nio.client.CloseableHttpAsyncClient;
 import org.apache.http.impl.nio.client.HttpAsyncClientBuilder;
 import org.apache.http.impl.nio.client.HttpAsyncClients;
 import org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager;
 import org.apache.http.impl.nio.reactor.DefaultConnectingIOReactor;
 import org.apache.http.impl.nio.reactor.IOReactorConfig;
 import org.apache.http.message.BasicNameValuePair;
 import org.apache.http.nio.conn.NoopIOSessionStrategy;
 import org.apache.http.nio.conn.SchemeIOSessionStrategy;
 import org.apache.http.nio.conn.ssl.SSLIOSessionStrategy;
 import org.apache.http.nio.reactor.ConnectingIOReactor;
 import org.apache.http.ssl.SSLContexts;
 import org.apache.http.util.EntityUtils;

 /**
  * HttpAsyncClient模拟post请求简单示例
  *
  * @author arron
  * @date 2015年11月1日 下午2:23:18
  * @version 1.0
  */
 public class SimpleHttpAsyncClientDemo {

     /**
      * 设置信任自定义的证书
      *
      * @param keyStorePath      密钥库路径
      * @param keyStorepass      密钥库密码
      * @return
      */
     public static SSLContext custom(String keyStorePath, String keyStorepass) {
         SSLContext sc = null;
         FileInputStream instream = null;
         KeyStore trustStore = null;
         try {
             trustStore = KeyStore.getInstance(KeyStore.getDefaultType());
             instream = new FileInputStream(new File(keyStorePath));
             trustStore.load(instream, keyStorepass.toCharArray());
             // 相信自己的CA和所有自签名的证书
             sc = SSLContexts.custom().loadTrustMaterial(trustStore, new TrustSelfSignedStrategy()).build();
         } catch (KeyStoreException | NoSuchAlgorithmException| CertificateException | IOException | KeyManagementException e) {
             e.printStackTrace();
         } finally {
             try {
                 instream.close();
             } catch (IOException e) {
             }
         }
         return sc;
     }

     /**
      * 绕过验证
      *
      * @return
      * @throws NoSuchAlgorithmException
      * @throws KeyManagementException
      */
     public static SSLContext createIgnoreVerifySSL() throws NoSuchAlgorithmException, KeyManagementException {
         SSLContext sc = SSLContext.getInstance("SSLv3");

         // 实现一个X509TrustManager接口，用于绕过验证，不用修改里面的方法
         X509TrustManager trustManager = new X509TrustManager() {
             @Override
             public void checkClientTrusted(
                     java.security.cert.X509Certificate[] paramArrayOfX509Certificate,
                     String paramString) throws CertificateException {
             }

             @Override
             public void checkServerTrusted(
                     java.security.cert.X509Certificate[] paramArrayOfX509Certificate,
                     String paramString) throws CertificateException {
             }

             @Override
             public java.security.cert.X509Certificate[] getAcceptedIssuers() {
                 return null;
             }
         };
         sc.init(null, new TrustManager[] { trustManager }, null);
         return sc;
     }

     /**
      * 设置代理
      * @param builder
      * @param hostOrIP
      * @param port
      */
     public static HttpAsyncClientBuilder proxy(String hostOrIP, int port){
         // 依次是代理地址，代理端口号，协议类型
         HttpHost proxy = new HttpHost(hostOrIP, port, "http");
         DefaultProxyRoutePlanner routePlanner = new DefaultProxyRoutePlanner(proxy);
         return HttpAsyncClients.custom().setRoutePlanner(routePlanner);
     }

     /**
      * 模拟请求
      *
      * @param url               资源地址
      * @param map           参数列表
      * @param encoding  编码
      * @param handler       结果处理类
      * @return
      * @throws NoSuchAlgorithmException
      * @throws KeyManagementException
      * @throws IOException
      * @throws ClientProtocolException
      */
     public static void send(String url, Map map,final String encoding, final AsyncHandler handler) throws KeyManagementException, NoSuchAlgorithmException, ClientProtocolException, IOException {

         //绕过证书验证，处理https请求
         SSLContext sslcontext = createIgnoreVerifySSL();

         // 设置协议http和https对应的处理socket链接工厂的对象
         Registry sessionStrategyRegistry = RegistryBuilder.create()
                 .register("http", NoopIOSessionStrategy.INSTANCE)
                 .register("https", new SSLIOSessionStrategy(sslcontext))
                 .build();
         //配置io线程
         IOReactorConfig ioReactorConfig = IOReactorConfig.custom().setIoThreadCount(Runtime.getRuntime().availableProcessors()).build();
         //设置连接池大小
         ConnectingIOReactor ioReactor;
         ioReactor = new DefaultConnectingIOReactor(ioReactorConfig);
         PoolingNHttpClientConnectionManager connManager = new PoolingNHttpClientConnectionManager(ioReactor, null, sessionStrategyRegistry, null);

         //创建自定义的httpclient对象
         final CloseableHttpAsyncClient client = proxy("127.0.0.1", 8087).setConnectionManager(connManager).build();
 //      CloseableHttpAsyncClient client = HttpAsyncClients.createDefault();

         //创建post方式请求对象
         HttpPost httpPost = new HttpPost(url);

         //装填参数
         List nvps = new ArrayList();
         if(map!=null){
             for (Entry entry : map.entrySet()) {
                 nvps.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
             }
         }
         //设置参数到请求对象中
         httpPost.setEntity(new UrlEncodedFormEntity(nvps, encoding));

         System.out.println("请求地址："+url);
         System.out.println("请求参数："+nvps.toString());

         //设置header信息
         //指定报文头【Content-type】、【User-Agent】
         httpPost.setHeader("Content-type", "application/x-www-form-urlencoded");
         httpPost.setHeader("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");

         // Start the client
         client.start();
         //执行请求操作，并拿到结果（异步）
         client.execute(httpPost, new FutureCallback() {

             @Override
             public void failed(Exception ex) {
                 handler.failed(ex);
                 close(client);
             }

             @Override
             public void completed(HttpResponse resp) {
                 String body="";
                 //这里使用EntityUtils.toString()方式时会大概率报错，原因：未接受完毕，链接已关
                 try {
                     HttpEntity entity = resp.getEntity();
                     if (entity != null) {
                         final InputStream instream = entity.getContent();
                         try {
                             final StringBuilder sb = new StringBuilder();
                             final char[] tmp = new char[1024];
                             final Reader reader = new InputStreamReader(instream,encoding);
                             int l;
                             while ((l = reader.read(tmp)) != -1) {
                                 sb.append(tmp, 0, l);
                             }
                             body = sb.toString();
                         } finally {
                             instream.close();
                             EntityUtils.consume(entity);
                         }
                     }
                 } catch (ParseException | IOException e) {
                     e.printStackTrace();
                 }
                 handler.completed(body);
                 close(client);
             }

             @Override
             public void cancelled() {
                 handler.cancelled();
                 close(client);
             }
         });
     }

     /**
      * 关闭client对象
      *
      * @param client
      */
     private static void close(CloseableHttpAsyncClient client) {
         try {
             client.close();
         } catch (IOException e) {
             e.printStackTrace();
         }
     }

     static class AsyncHandler implements IHandler{

         @Override
         public Object failed(Exception e) {
             System.err.println(Thread.currentThread().getName()+"--失败了--"+e.getClass().getName()+"--"+e.getMessage());
             return null;
         }
         @Override
         public Object completed(String respBody) {
             System.out.println(Thread.currentThread().getName()+"--获取内容："+respBody);
             return null;
         }
         @Override
         public Object cancelled() {
             System.out.println(Thread.currentThread().getName()+"--取消了");
             return null;
         }
     }

     /**
      * 回调处理接口
      *
      * @author arron
      * @date 2015年11月10日 上午10:05:40
      * @version 1.0
      */
     public interface IHandler {

         /**
          * 处理异常时，执行该方法
          * @return
          */
         Object failed(Exception e);

         /**
          * 处理正常时，执行该方法
          * @return
          */
         Object completed(String respBody);

         /**
          * 处理取消时，执行该方法
          * @return
          */
         Object cancelled();
     }

 }

来一个测试类：

 public static void main(String[] args) throws KeyManagementException, NoSuchAlgorithmException, ClientProtocolException, IOException {
     AsyncHandler handler = new AsyncHandler();
     String url = "http://php.weather.sina.com.cn/iframe/index/w_cl.php";
     Map map = new HashMap();
     map.put("code", "js");
     map.put("day", "0");
     map.put("city", "上海");
     map.put("dfc", "1");
     map.put("charset", "utf-8");
     send(url, map, "utf-8", handler);

     System.out.println("-----------------------------------");

     map.put("city", "北京");
     send(url, map, "utf-8", handler);

     System.out.println("-----------------------------------");

 }

测试结果如下：

很简单吧，其实基于HttpAsyncClient的工具类我也进行了封装，跟HttpClient工具类差不多。