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spring boot 整合 HttpClient

第一步：引入HttpClient 的jar包

　　1、httpClient 5.0 开始支持异步（Async）请求；

　　2、httpclient 版本过低上传文件会出，原因是 org.apache.http.entity.ContentType 没有方法 withParameters(final NameValuePair... params)；

<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
</dependency>
<!-- httpClient文件上传需要 -->
<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpmime</artifactId>
</dependency>

第二步：创建一个httpClient的配置类

  1 package com.123.lenovo.adapter.se.config;
  2 
  3 import java.security.KeyStore;
  4 import javax.net.ssl.SSLContext;
  5 
  6 import org.apache.http.HeaderElement;
  7 import org.apache.http.HeaderElementIterator;
  8 import org.apache.http.HttpResponse;
  9 import org.apache.http.client.config.RequestConfig;
 10 import org.apache.http.conn.ConnectionKeepAliveStrategy;
 11 import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
 12 import org.apache.http.conn.ssl.TrustAllStrategy;
 13 import org.apache.http.impl.client.CloseableHttpClient;
 14 import org.apache.http.impl.client.DefaultHttpRequestRetryHandler;
 15 import org.apache.http.impl.client.HttpClientBuilder;
 16 import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
 17 import org.apache.http.message.BasicHeaderElementIterator;
 18 import org.apache.http.protocol.HTTP;
 19 import org.apache.http.protocol.HttpContext;
 20 import org.apache.http.ssl.SSLContexts;
 21 import org.elasticsearch.Build;
 22 import org.springframework.beans.factory.annotation.Value;
 23 import org.springframework.context.annotation.Bean;
 24 import org.springframework.context.annotation.Configuration;
 25 
 26 import com.123.lenovo.adapter.se.common.IdleConnectionEvictor;
 27 
 28 @Configuration
 29 public class HttpClientConfig {
 30 
 31     @Value("${http_max_total}")
 32     private int maxTotal = 800;
 33     
 34     @Value("${http_default_max_perRoute}")
 35     private int defaultMaxPerRoute = 80;
 36     
 37     @Value("${http_validate_after_inactivity}")
 38     private int validateAfterInactivity = 1000;
 39     
 40     @Value("${http_connection_request_timeout}")
 41     private int connectionRequestTimeout = 5000;
 42     
 43     @Value("${http_connection_timeout}")
 44     private int connectTimeout = 10000;
 45     
 46     @Value("${http_socket_timeout}")
 47     private int socketTimeout = 20000;
 48     
 49     @Value("${waitTime}")
 50     private int waitTime = 30000;
 51     
 52     @Value("${idleConTime}")
 53     private int idleConTime = 3;
 54     
 55     @Value("${retryCount}")
 56     private int retryCount = 3;
 57     
 58     @Bean
 59     public PoolingHttpClientConnectionManager createPoolingHttpClientConnectionManager() {
 60         PoolingHttpClientConnectionManager poolmanager = new PoolingHttpClientConnectionManager();
 61         poolmanager.setMaxTotal(maxTotal);
 62         poolmanager.setDefaultMaxPerRoute(defaultMaxPerRoute);
 63         poolmanager.setValidateAfterInactivity(validateAfterInactivity);
 64         return poolmanager;
 65     }
 66     
 67     @Bean
 68     public CloseableHttpClient createHttpClient(PoolingHttpClientConnectionManager poolManager) {
 69         HttpClientBuilder httpClientBuilder = HttpClientBuilder.create().setConnectionManager(poolManager);
 70         httpClientBuilder.setKeepAliveStrategy(new ConnectionKeepAliveStrategy() {
 71             
 72             @Override
 73             public long getKeepAliveDuration(HttpResponse response, HttpContext context) {
 74                 HeaderElementIterator iterator = new BasicHeaderElementIterator(response.headerIterator(HTTP.CONN_KEEP_ALIVE));
 75                 while (iterator.hasNext()) {
 76                     HeaderElement headerElement = iterator.nextElement();
 77                     String param = headerElement.getName();
 78                     String value = headerElement.getValue();
 79                     if (null != value && param.equalsIgnoreCase("timeout")) {
 80                         return Long.parseLong(value) * 1000;
 81                     }
 82                 }
 83                 return 30 * 1000;
 84             }
 85         });
 86         httpClientBuilder.setRetryHandler(new DefaultHttpRequestRetryHandler(retryCount, false));
 87         return httpClientBuilder.build();
 88     }102     
103     @Bean
104     public RequestConfig createRequestConfig() {
105         return RequestConfig.custom()
106                 .setConnectionRequestTimeout(connectionRequestTimeout)     // 从连接池中取连接的超时时间
107                 .setConnectTimeout(connectTimeout)                        // 连接超时时间
108                 .setSocketTimeout(socketTimeout)                        // 请求超时时间
109                 .build();
110     }
111     
112     @Bean
113     public IdleConnectionEvictor createIdleConnectionEvictor(PoolingHttpClientConnectionManager poolManager) {
114         IdleConnectionEvictor idleConnectionEvictor = new IdleConnectionEvictor(poolManager, waitTime, idleConTime);
115         return idleConnectionEvictor;
116     }
117     
118 }

第三步：创建httpClient的工具类

  1 @Component
  2 public class HttpClientHelper {
  3     
  4     private Logger LOGGER = LoggerFactory.getLogger(HttpClientHelper.class);
  5     
  6     @Autowired
  7     private CloseableHttpClient httpClient;
  8     
  9     @Autowired
 10     private RequestConfig requestConfig;
 11     
 12     public String get(String url, HashMap<String, Object> paramMap, HashMap<String, Object> header) {
 13         String result = null;
 14         if ("".equals(url)) {
 15             return result;
 16         }
 17         // 创建一个request对象
 18         HttpGet httpGet = new HttpGet(url);
 19         CloseableHttpResponse response = null;
 20         try {
 21             // 配置连接参数
 22             httpGet.setConfig(requestConfig);
 23             //设置参数  
 24             if (paramMap != null && paramMap.size() > 0) {
 25                 List<NameValuePair> params = new ArrayList<>();
 26                 for (Entry<String, Object> entry : paramMap.entrySet()) {
 27                     params.add(new BasicNameValuePair(entry.getKey(), URLEncoder.encode(entry.getValue().toString(), "UTF-8")));
 28                 }
 29                 String strParams = EntityUtils.toString(new UrlEncodedFormEntity(params));
 30                 // 防止多参数时，分隔符","被转义
 31                 String realParams = URLDecoder.decode(strParams, "UTF-8");
 32                 httpGet.setURI(new URI(httpGet.getURI().toString().indexOf("?") > 0 ? httpGet.getURI().toString() + "&" + realParams : httpGet.getURI().toString() + "?" + realParams));
 33             }
 34             // 设置头
 35             if (header != null && header.size() > 0) {
 36                 for (Entry<String, Object> entry : header.entrySet()) {
 37                     httpGet.addHeader(entry.getKey(), entry.getValue().toString());
 38                 }
 39             }
 40             // 执行request请求
 41             response = httpClient.execute(httpGet);
 42             result = parseResponse(response);
 43             
 44         } catch (Exception e) {
 45             LOGGER.error("url : "+ url +", msg : " + e.getMessage());
 46             httpGet.abort();
 47         } finally {
 48             try {
 49                 if (response != null) {
 50                     response.close();
 51                 }
 52             } catch (IOException e) {
 53                 e.printStackTrace();
 54             }
 55         }
 56         return result;
 57     }
 58     
 59     public String post(String url, HashMap<String, Object> paramMap, HashMap<String, Object> header) {
 60         String result = null;
 61         if ("".equals(url)) {
 62             return result;
 63         }
 64         // 创建一个request对象
 65         HttpPost httpPost = new HttpPost(url);
 66         CloseableHttpResponse response = null;
 67         try {
 68             // 配置连接参数
 69             httpPost.setConfig(requestConfig);
 70             // 设置参数
 71             if (paramMap != null && paramMap.size() > 0) {
 72                 List<NameValuePair> params = new ArrayList<>();
 73                 for (Entry<String, Object> entry : paramMap.entrySet()) {
 74                     params.add(new BasicNameValuePair(entry.getKey(), entry.getValue().toString()));
 75                 }
 76                 HttpEntity entity = new UrlEncodedFormEntity(params);
 77                 httpPost.setEntity(entity);
 78             }
 79             // 设置头
 80             if (header != null && header.size() > 0) {
 81                 for (Entry<String, Object> entry : header.entrySet()) {
 82                     httpPost.addHeader(entry.getKey(), entry.getValue().toString());
 83                 }
 84             }
 85             // 执行request请求
 86             response = httpClient.execute(httpPost);
 87             result = reponseHandle(response);
 88         } catch (Exception e) {
 89             LOGGER.error("url : "+ url +", msg : " + e.getMessage());
 90             httpPost.abort();
 91         } finally {
 92             try {
 93                 if (response != null) {
 94                     response.close();
 95                 }
 96             } catch (IOException e) {
 97                 e.printStackTrace();
 98             }
 99         }
100         return result;
101     }
102     
103     public String postJSON(String url, String json_str, HashMap<String, Object> header) {
104         String result = null;
105         if ("".equals(url)) {
106             return result;
107         }
108         // 创建一个request对象
109         HttpPost httpPost = new HttpPost(url);
110         CloseableHttpResponse response = null;
111         try {
112             // 配置连接参数
113             httpPost.setConfig(requestConfig);
114             // 设置参数
115             if (json_str != null && !"".equals(json_str)) {
116                 StringEntity entity = new StringEntity(json_str, ContentType.APPLICATION_JSON);
117                 entity.setContentEncoding("UTF-8");    
118                 entity.setContentType("application/json");
119                 httpPost.setEntity(entity);
120             }
121             // 设置头
122             if (header != null && header.size() > 0) {
123                 for (Entry<String, Object> entry : header.entrySet()) {
124                     httpPost.addHeader(entry.getKey(), entry.getValue().toString());
125                 }
126             }
127             // 执行request请求
128             response = httpClient.execute(httpPost);
129             result = reponseHandle(response);
130             
131         } catch (Exception e) {
132             LOGGER.error("url : "+ url +", msg : " + e.getMessage()+", param : " +json_str);
133             httpPost.abort();
134         } finally {
135             try {
136                 if (response != null) {
137                     response.close();
138                 }
139             } catch (IOException e) {
140                 e.printStackTrace();
141             }
142         }
143         return result;
144     }
145     
146     public String uploadFile(String url, String filePath, String fileParam, Map<String, Object> params) {
147         File file = new File(filePath);
148         if (!(file.exists() && file.isFile())) {
149             throw new RuntimeException("file : file is null");
150         }
151         String result = null;
152         if ("".equals(url)) {
153             return result;
154         }
155         // 创建一个request对象
156         HttpPost httpPost = new HttpPost(url);
157         CloseableHttpResponse response = null;
158         try {
159             // 配置连接参数
160             httpPost.setConfig(requestConfig);
161             MultipartEntityBuilder builder = MultipartEntityBuilder.create();
162             builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
163             builder.addBinaryBody(fileParam, file, ContentType.DEFAULT_BINARY, file.getName());
164             if (params != null && params.size() > 0) {
165                 for (Entry<String, Object> entry : params.entrySet()) {
166                     builder.addTextBody(entry.getKey(), entry.getValue().toString(), ContentType.create("text/plain", Consts.UTF_8));
167                 }
168             }
169             HttpEntity requestEntity = builder.build();
170             httpPost.setEntity(requestEntity);
171             // 执行request请求
172             response = httpClient.execute(httpPost);
173             result = reponseHandle(response);
174             
175         } catch (Exception e) {
176             httpPost.abort();
177         } finally {
178             try {
179                 if (response != null) {
180                     response.close();
181                 }
182             } catch (IOException e) {
183                 e.printStackTrace();
184             }
185         }
186         return result;
187     }
188     
189     /**
190      * 解析 response数据
191      * @description
192      * @param response
193      * @return
194      * @author tangjingjing
195      * @date 2018年10月12日
196      */
197     private String parseResponse(CloseableHttpResponse response) {
198         String result = "";
199         // 获取响应体
200         HttpEntity httpEntity = null;
201         InputStream inputStream = null;
202         try {
203             // 获取响应状态
204             int statusCode = response.getStatusLine().getStatusCode();
205             // 没有正常响应
206             if (statusCode < HttpStatus.SC_OK || statusCode >= HttpStatus.SC_MULTIPLE_CHOICES) {
207                 throw new RuntimeException("statusCode : " + statusCode);
208             }
209             // 获取响应体
210             httpEntity = response.getEntity();
211             if (httpEntity != null) {
212                 inputStream = httpEntity.getContent();
213                 BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream,"UTF-8"));
214                 StringBuffer sb = new StringBuffer();
215                 String line = "";
216                 while((line=reader.readLine())!=null){
217                     sb.append(line);
218                 }
219                 reader.close();
220                 result = sb.toString();
221             }
222 
223         } catch (Exception e) {
224             LOGGER.error("HttpClientHelper parseResponse error", e);
225         } finally {
226             if (inputStream != null) {
227                 try {
228                     inputStream.close();
229                 } catch (IOException e) {
230                     e.printStackTrace();
231                 }
232             }
233             // 如果httpEntity没有被完全消耗，那么连接无法安全重复使用，将被关闭并丢弃
234             try {
235                 EntityUtils.consume(httpEntity);
236             } catch (IOException e) {
237                 e.printStackTrace();
238             }
239         }
240         return result;
241     }
242     
243     private String reponseHandle(CloseableHttpResponse response) {
244         String result = "";
245         // 获取响应体
246         HttpEntity httpEntity = null;
247         try {
248             // 获取响应状态
249             int statusCode = response.getStatusLine().getStatusCode();
250             // 没有正常响应
251             if (statusCode < HttpStatus.SC_OK || statusCode >= HttpStatus.SC_MULTIPLE_CHOICES) {
252                 throw new RuntimeException("statusCode : " + statusCode);
253             }
254             // 获取响应体
255             httpEntity = response.getEntity();
256             if (httpEntity !=null) {
257                 result = EntityUtils.toString(httpEntity);
258             }
259             
260         } catch (Exception e) {
261             LOGGER.error("HttpClientHelper reponseHandle error", e);
262         } finally {
263             // 如果httpEntity没有被完全消耗，那么连接无法安全重复使用，将被关闭并丢弃
264             try {
265                 EntityUtils.consume(httpEntity);
266             } catch (IOException e) {
267                 e.printStackTrace();
268             }
269         }
270         return result;
271     }
272     
273 }

第四步：创建HttpClient无效连接清除类

 1 /**
 2  * 定期清理无效的http连接
 3  * @author viruser
 4  *
 5  */
 6 package com.123.lenovo.adapter.se.common;
 7 
 8 import java.util.concurrent.TimeUnit;
 9 
10 import javax.annotation.PreDestroy;
11 
12 import org.apache.http.conn.HttpClientConnectionManager;
13 
14 /**
15  * 定期清理无效的http连接
16  * @author viruser
17  *
18  */
19 public class IdleConnectionEvictor extends Thread {
20 
21     private final HttpClientConnectionManager manager;
22     
23     private Integer waitTime;
24     
25     private Integer idleConTime;
26     
27     private volatile boolean shutdown = true;
28     
29     public IdleConnectionEvictor(HttpClientConnectionManager manager, Integer waitTime, Integer idleConTime) {
30         this.manager = manager;
31         this.waitTime = waitTime;
32         this.idleConTime = idleConTime;
33         this.start();
34     }
35     
36     @Override
37     public void run() {
38         try {
39             if (shutdown) {
40                 synchronized (this) {
41                     wait(waitTime);
42                     manager.closeIdleConnections(idleConTime, TimeUnit.SECONDS);
43                     // 关闭失效的连接
44                     manager.closeExpiredConnections();
45                 }
46             }
47         } catch (Exception e) {
48             
49         }
50     }
51     
52     @PreDestroy
53     public void shutdown() {
54         shutdown = false;
55         synchronized (this) {
56             notifyAll();
57         }
58     }
59     
60 }

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原文地址：https://www.cnblogs.com/super-jing/p/10794564.html