轻松把玩HttpAsyncClient之模拟post请求示例

       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<HttpResponse> 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() {@Overridepublic void checkClientTrusted(java.security.cert.X509Certificate[] paramArrayOfX509Certificate,String paramString) throws CertificateException {}@Overridepublic void checkServerTrusted(java.security.cert.X509Certificate[] paramArrayOfX509Certificate,String paramString) throws CertificateException {}@Overridepublic 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<String,String> 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<SchemeIOSessionStrategy> sessionStrategyRegistry = RegistryBuilder.<SchemeIOSessionStrategy>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<NameValuePair> nvps = new ArrayList<NameValuePair>();if(map!=null){for (Entry<String, String> 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 clientclient.start();//执行请求操作，并拿到结果（异步）client.execute(httpPost, new FutureCallback<HttpResponse>() {@Overridepublic void failed(Exception ex) {handler.failed(ex);close(client);}@Overridepublic 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);}@Overridepublic 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{@Overridepublic Object failed(Exception e) {System.err.println(Thread.currentThread().getName()+"--失败了--"+e.getClass().getName()+"--"+e.getMessage());return null;}@Overridepublic Object completed(String respBody) {System.out.println(Thread.currentThread().getName()+"--获取内容："+respBody);return null;}@Overridepublic 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<String, String> map = new HashMap<String, String>();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。

       代码都已经提交至：https://github.com/Arronlong/httpclientUtil。有兴趣的自行下载，博客中就不再分享了。

       httpclientUtil （QQ交流群:548452686 ）