HttpClient同步调用与 HttpAsyncClient 异步调用

深碍√TFBOYSˉ_ 2022-02-05 07:13 1019阅读 0赞

官网示例地址： [http://hc.apache.org/httpcomponents-asyncclient-4.1.x/index.html][http_hc.apache.org_httpcomponents-asyncclient-4.1.x_index.html]

需要的jar包：去maven仓库下就好了

httpasyncclient

httpclient

httpcore

httpcore-nio

![20190612154525926.png][]

1: 同步调用

post

/**
    	 * 
    	 * doPost 使用HTTP POST的方式调用WebService
    	 * 
    	 * @param url 路径
    	 * @param parameters 参数
    	 * @return String 
    	 */
    	public static String doPost(String url, List<NameValuePair> parameters) {
    		// 构建httpclient
    		CloseableHttpClient httpClient = HttpClients.createDefault();
    		//配置超时时间
    		RequestConfig config = RequestConfig.custom().setConnectTimeout(3000).setConnectionRequestTimeout(3000).setSocketTimeout(3000).build();
    		
    		// 构建httppost
    		HttpPost httpPost = new HttpPost(url);
    		httpPost.setConfig(config);
    		// 构建EntityBuilder
    		EntityBuilder builder = EntityBuilder.create();
    		// 设置ContentType为默认的application/x-www-form-urlencoded
    		builder.setContentType(ContentType.create("application/x-www-form-urlencoded"));
    		// 将所有参数设置都builder中
    		builder.setParameters(parameters);
    		// 构建HttpEntity
    		HttpEntity entity = builder.build();
    		// 设置entity到httppost
    		httpPost.setEntity(entity);
    		String result = "";
    		try {
    			// 执行httppost请求，并用httpResponse接收
    			HttpResponse response = httpClient.execute(httpPost);
    			int statusCode = response.getStatusLine().getStatusCode();
    			// 状态200
    			if (statusCode == HttpStatus.SC_OK) {
    				InputStream is = response.getEntity().getContent();
    				//读取数据流转String
    				result = getStreamAsString(is);
    			}else{
    				logger.error("调用WebService返回状态异常",url,statusCode);	
    			}
    		} catch (UnsupportedEncodingException e) {
    			logger.error("调用WebService发生致命的异常，可能是协议不对或者内容有问题",url,e.getMessage());
    		} catch (ClientProtocolException e) {
    			logger.error("调用WebService发生致命的异常，可能是协议不对或者内容有问题",url,e.getMessage());
    		} catch (IOException e) {
    			logger.error("调用WebService发生网络异常",url,e);
    		} finally {
    			// 关闭httpclient
    			try {
    				httpClient.close();
    			} catch (IOException e) {
    				e.printStackTrace();
    			}
    		}
    		return result;
    	}
    
    	/**
    	 * 
    	 * getStreamAsString 读取数据流转String
    	 * 
    	 * @param stream 数据流
    	 * @return
    	 * @throws IOException
    	 */
    	private static String getStreamAsString(InputStream stream) throws IOException {
    		try {
    			BufferedReader reader = new BufferedReader(new InputStreamReader(stream,"UTF-8"));
    			StringWriter writer = new StringWriter();
    			char[] chars = new char[8192];
    			int count = 0;
    			while ((count = reader.read(chars)) > 0) {
    				writer.write(chars, 0, count);
    			}
    			return writer.toString();
    		} finally {
    			if (null != stream) {
    				stream.close();
    			}
    		}
    	}

get

package com.fr.data;
    
    import java.io.IOException;
    
    import org.apache.http.HttpResponse;
    import org.apache.http.client.HttpClient;
    import org.apache.http.client.config.RequestConfig;
    import org.apache.http.client.config.RequestConfig.Builder;
    import org.apache.http.client.methods.HttpGet;
    import org.apache.http.impl.client.HttpClients;
    import org.apache.http.util.EntityUtils;
    
    import com.alibaba.fastjson.JSONObject;
    
    /** 
     * ClassName: HttpClientRequest
     * Function: TODO ADD FUNCTION. 
     * date: 2019年4月18日 下午4:58:00
     * 
     * @author cf 
     */
    public class HttpClientRequest {
        //多线程创建
        private static final HttpClient client = HttpClients.custom().build();
    
        /**
        *
        * (post)
        *
        * @param map 参数
        * @return 返回结果
        * @throws Exception
        * @author tangjiandong
        */
       public static  JSONObject get(String url)
       {
              HttpGet get = new HttpGet(url);
    
              //连接与响应时间设置
              RequestConfig config = RequestConfig.custom().setConnectTimeout(2000).setSocketTimeout(2000).build();
           get.setConfig(config);
           JSONObject obj = null;
           try{
                   HttpResponse  response = client.execute(get);
               if(200 == response.getStatusLine().getStatusCode())
               {
                   obj = JSONObject.parseObject(new String(EntityUtils.toString(response.getEntity()).getBytes("iso8859-1"), "UTF-8"));
               }
           }catch (IOException e) {
               return null;
           }catch (Exception e) {
               return null;
           }{
               //释放连接
                   get.releaseConnection();
           }
           return obj;
       }
    }

2：异步调用

/** 
     * Project Name:finereport10 
     * File Name:HttpClientRequest.java 
     * Package Name:com.fr.data 
     * Date:2019年4月18日 下午4:58:00 
     * Copyright (c) 2019, 航天长峰湖南分公司  All Rights Reserved. 
     * 
     */
    package com.fr.data;
    
    import java.io.IOException;
    import java.util.concurrent.Future;
    
    import org.apache.http.HttpResponse;
    import org.apache.http.client.HttpClient;
    import org.apache.http.client.config.RequestConfig;
    import org.apache.http.client.config.RequestConfig.Builder;
    import org.apache.http.client.methods.HttpGet;
    import org.apache.http.impl.client.HttpClients;
    import org.apache.http.impl.nio.client.CloseableHttpAsyncClient;
    import org.apache.http.impl.nio.client.HttpAsyncClients;
    import org.apache.http.nio.conn.NoopIOSessionStrategy;
    import org.apache.http.nio.conn.SchemeIOSessionStrategy;
    import org.apache.http.util.EntityUtils;
    
    import com.alibaba.fastjson.JSONObject;
    
    /** 
     * ClassName: HttpClientRequest
     * Function: TODO ADD FUNCTION. 
     * date: 2019年4月18日 下午4:58:00
     * 
     * @author cf 
     */
    public class HttpClientRequest {
    	
    	private static final int socketTimeout = 2000; //数据等待超时时间
    	private static final int connectTimeout = 6000; //连接等待时间
    	private static final int requestTimeout = 2000; // 连接请求超时时间
    	
    
    	
    	private static   RequestConfig config = RequestConfig.custom().setSocketTimeout(socketTimeout).setConnectTimeout(connectTimeout).setConnectionRequestTimeout(requestTimeout).build();
    	
    	private static CloseableHttpAsyncClient asyncClient = HttpAsyncClients.custom().setDefaultRequestConfig(config).build();
    	
    	
    
    	/**
        *
        * (get)
        *
        * @param map 参数
        * @return 返回结果
        * @throws Exception
        * @author tangjiandong
        */
       public static  JSONObject get(String url)
       {
       	   HttpGet get = new HttpGet(url);
       	   RequestConfig config = RequestConfig.custom().setConnectTimeout(connectTimeout).setConnectionRequestTimeout(requestTimeout).setSocketTimeout(socketTimeout).build();
           get.setConfig(config);
          
           JSONObject obj = null;
      	 
      		try {
      			asyncClient.start();
           		HttpResponse httpResponse = asyncClient.execute(get, null).get();
           	
    			if (200 == httpResponse.getStatusLine().getStatusCode()) {
    					obj = JSONObject.parseObject(new 
                          String(EntityUtils.toString(httpResponse.getEntity()).getBytes(
    							"iso8859-1"), "UTF-8"));
    				}
    			} catch (IOException e) {
    				return null;
    			} catch (Exception e) {
    				return null;
    			} finally {
    				// 释放连接
    				get.releaseConnection();
    				try {
    					asyncClient.close();
    				} catch (IOException e) {
    					e.printStackTrace();
    				}
    			}
           
           return obj;
       }
    
       
    
       
    }

[http_hc.apache.org_httpcomponents-asyncclient-4.1.x_index.html]: http://hc.apache.org/httpcomponents-asyncclient-4.1.x/index.html
[20190612154525926.png]: /images/20220205/ef49a538822c4b6ea3bc25afd1be2b01.png