org.apache.http.NoHttpResponseException: xxx.xxx.xxx:80 failed to respond

怼烎@ 2022-01-22 12:07 305阅读 0赞

1，出现场景：微信回调函数访问后发送模板消息，之前项目中使用的http的post请求没有问题，然后复制在新项目中，就报org.apache.http.NoHttpResponseException错误，后来在网上搜索了一大堆也没有解决问题，后面就调用其他post请求的数据类型的方式（xml，map,json）但是还是报错

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2JhaWR1XzM4MjI2MjMz_size_16_color_FFFFFF_t_70][]  
2，后面就不断修改代码不断测试，直到将Content-Type的类型修改成utf-8，然后就正常了，这是什么鬼哟，Content-Type是没有这个类型的吧？？？具体原因还没有找到，但是可正常请求返回了

3,请求截图

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2JhaWR1XzM4MjI2MjMz_size_16_color_FFFFFF_t_70 1][]

4，请求结果：

![20190606113001743.png][]

5，http工具类

package com.pflm.util.httpclient;
    
    import java.io.BufferedReader;
    import java.io.File;
    import java.io.IOException;
    import java.io.InputStreamReader;
    import java.io.InterruptedIOException;
    import java.io.PrintWriter;
    import java.io.UnsupportedEncodingException;
    import java.net.URL;
    import java.net.URLConnection;
    import java.net.UnknownHostException;
    import java.nio.charset.CodingErrorAction;
    import java.security.KeyManagementException;
    import java.security.KeyStoreException;
    import java.security.NoSuchAlgorithmException;
    import java.util.ArrayList;
    import java.util.Arrays;
    import java.util.List;
    import java.util.Map;
    
    import javax.net.ssl.SSLContext;
    import javax.net.ssl.SSLException;
    
    import org.apache.http.Consts;
    import org.apache.http.Header;
    import org.apache.http.HeaderElement;
    import org.apache.http.HeaderElementIterator;
    import org.apache.http.HttpEntity;
    import org.apache.http.HttpEntityEnclosingRequest;
    import org.apache.http.HttpException;
    import org.apache.http.HttpHeaders;
    import org.apache.http.HttpHost;
    import org.apache.http.HttpRequest;
    import org.apache.http.HttpRequestInterceptor;
    import org.apache.http.HttpResponse;
    import org.apache.http.HttpResponseInterceptor;
    import org.apache.http.NameValuePair;
    import org.apache.http.client.ClientProtocolException;
    import org.apache.http.client.HttpRequestRetryHandler;
    import org.apache.http.client.config.AuthSchemes;
    import org.apache.http.client.config.RequestConfig;
    import org.apache.http.client.entity.GzipDecompressingEntity;
    import org.apache.http.client.entity.UrlEncodedFormEntity;
    import org.apache.http.client.methods.CloseableHttpResponse;
    import org.apache.http.client.methods.HttpGet;
    import org.apache.http.client.methods.HttpPost;
    import org.apache.http.client.protocol.HttpClientContext;
    import org.apache.http.client.utils.URLEncodedUtils;
    import org.apache.http.config.ConnectionConfig;
    import org.apache.http.config.Registry;
    import org.apache.http.config.RegistryBuilder;
    import org.apache.http.config.SocketConfig;
    import org.apache.http.conn.ConnectTimeoutException;
    import org.apache.http.conn.ConnectionKeepAliveStrategy;
    import org.apache.http.conn.routing.HttpRoute;
    import org.apache.http.conn.socket.ConnectionSocketFactory;
    import org.apache.http.conn.socket.PlainConnectionSocketFactory;
    import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
    import org.apache.http.conn.ssl.SSLContexts;
    import org.apache.http.conn.ssl.TrustSelfSignedStrategy;
    import org.apache.http.entity.ContentType;
    import org.apache.http.entity.StringEntity;
    import org.apache.http.entity.mime.MultipartEntityBuilder;
    import org.apache.http.entity.mime.content.FileBody;
    import org.apache.http.entity.mime.content.StringBody;
    import org.apache.http.impl.client.CloseableHttpClient;
    import org.apache.http.impl.client.HttpClients;
    import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
    import org.apache.http.message.BasicHeaderElementIterator;
    import org.apache.http.message.BasicNameValuePair;
    import org.apache.http.protocol.HTTP;
    import org.apache.http.protocol.HttpContext;
    import org.apache.http.util.Args;
    import org.apache.http.util.EntityUtils;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.w3c.dom.Document;
    
    import com.alibaba.fastjson.JSONObject;
    
    
    public class HttpClientUtils {
    
    	private static final Logger log = LoggerFactory.getLogger(HttpClientUtils.class);
    
    	public static final ContentType UTF8_TEXT_PLAIN_CONTENT_TYPE = ContentType.create("text/plain", Consts.UTF_8);
    	public static final ContentType DEFAULT_BINARY_CONTENT_TYPE = ContentType.create("application/octet-stream",
    			Consts.UTF_8);
    
    	private static final String ACCEPT_LANGUAGE = "zh-CN,zh;q=0.8";
    	private static final String USER_AGENT = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.154 Safari/537.36";
    	//private static final String JSON_CONTENT_TYPE = "application/json; encoding=utf-8";
    	/**
    	 * 修改成utf-8，就可正常请求了
    	 */
    	private static final String JSON_CONTENT_TYPE = "utf-8";
    	private static final int TIME_OUT = 10 * 1000;
    
    	private static CloseableHttpClient httpClient = null;
    
    	public static CloseableHttpClient getHttpClient() {
    
    		if (httpClient == null) {
    
    			try {
    				ConnectionKeepAliveStrategy myStrategy = new ConnectionKeepAliveStrategy() {
    
    					public long getKeepAliveDuration(HttpResponse response, HttpContext context) {
    						// Honor 'keep-alive' header
    						HeaderElementIterator it = new BasicHeaderElementIterator(
    								response.headerIterator(HTTP.CONN_KEEP_ALIVE));
    						while (it.hasNext()) {
    							HeaderElement he = it.nextElement();
    							String param = he.getName();
    							String value = he.getValue();
    							if (value != null && param.equalsIgnoreCase("timeout")) {
    								try {
    									return Long.parseLong(value) * 1000;
    								} catch (NumberFormatException ignore) {
    								}
    							}
    						}
    						HttpHost target = (HttpHost) context.getAttribute(HttpClientContext.HTTP_TARGET_HOST);
    						if ("file.api.weixin.qq.com".equalsIgnoreCase(target.getHostName())) {
    							// Keep alive for 5 seconds only
    							return 10 * 1000;
    						} else {
    							// otherwise keep alive for 30 seconds
    							return 30 * 1000;
    						}
    					}
    
    				};
    
    				HttpRequestRetryHandler myRetryHandler = new HttpRequestRetryHandler() {
    
    					public boolean retryRequest(IOException exception, int executionCount, HttpContext context) {
    						if (executionCount >= 3) {
    							// 如果已经重试了3次，就放弃
    							return false;
    						}
    						if (exception instanceof InterruptedIOException) {
    							// 超时
    							return false;
    						}
    						if (exception instanceof UnknownHostException) {
    							// 目标服务器不可达
    							return false;
    						}
    						if (exception instanceof ConnectTimeoutException) {
    							// 连接被拒绝
    							return false;
    						}
    						if (exception instanceof SSLException) {
    							// ssl握手异常
    							return false;
    						}
    						HttpClientContext clientContext = HttpClientContext.adapt(context);
    						HttpRequest request = clientContext.getRequest();
    						boolean idempotent = !(request instanceof HttpEntityEnclosingRequest);
    						if (idempotent) {
    							// 如果请求是幂等的，就再次尝试
    							return true;
    						}
    						return false;
    					}
    
    				};
    
    				// Trust own CA and all self-signed certs
    				SSLContext sslcontext = SSLContexts.custom().loadTrustMaterial(null, new TrustSelfSignedStrategy())
    						.build();
    				// Allow TLSv1 protocol only
    				SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslcontext, new String[] { "TLSv1" },
    						null, SSLConnectionSocketFactory.BROWSER_COMPATIBLE_HOSTNAME_VERIFIER);
    
    				Registry<ConnectionSocketFactory> socketFactoryRegistry = RegistryBuilder
    						.<ConnectionSocketFactory> create().register("http", PlainConnectionSocketFactory.INSTANCE)
    						.register("https", sslsf).build();
    
    				PoolingHttpClientConnectionManager connManager = new PoolingHttpClientConnectionManager(
    						socketFactoryRegistry);
    				// 将最大连接数增加到200
    				connManager.setMaxTotal(500);
    				// 将每个路由基础的连接增加到20
    				connManager.setDefaultMaxPerRoute(100);
    				// 将目标主机的最大连接数增加到100
    				HttpHost weiXinApiHost = new HttpHost("api.weixin.qq.com", 443);
    				connManager.setMaxPerRoute(new HttpRoute(weiXinApiHost), 200);
    
    				// Create socket configuration
    				SocketConfig socketConfig = SocketConfig.custom().setTcpNoDelay(true).build();
    				connManager.setDefaultSocketConfig(socketConfig);
    
    				// Create connection configuration
    				ConnectionConfig connectionConfig = ConnectionConfig.custom()
    						.setMalformedInputAction(CodingErrorAction.IGNORE)
    						.setUnmappableInputAction(CodingErrorAction.IGNORE).setCharset(Consts.UTF_8).build();
    				connManager.setDefaultConnectionConfig(connectionConfig);
    
    				// Use custom cookie store if necessary.
    				// CookieStore cookieStore = new BasicCookieStore();
    				// Create global request configuration
    				RequestConfig defaultRequestConfig = RequestConfig.custom()
    						// .setCookieSpec(CookieSpecs.BEST_MATCH)
    						.setExpectContinueEnabled(false).setStaleConnectionCheckEnabled(true)
    						.setTargetPreferredAuthSchemes(Arrays.asList(AuthSchemes.NTLM, AuthSchemes.DIGEST))
    						.setProxyPreferredAuthSchemes(Arrays.asList(AuthSchemes.BASIC))
    						.setConnectionRequestTimeout(TIME_OUT).setConnectTimeout(TIME_OUT).setSocketTimeout(TIME_OUT)
    						.build();
    
    				HttpRequestInterceptor requestInterceptor = new HttpRequestInterceptor() {
    
    					public void process(final HttpRequest request, final HttpContext context)
    							throws HttpException, IOException {
    						if (!request.containsHeader("Accept-Encoding")) {
    							request.addHeader("Accept-Encoding", "gzip");
    						}
    
    						request.addHeader(HttpHeaders.ACCEPT_LANGUAGE, ACCEPT_LANGUAGE);
    						// request.addHeader(HttpHeaders.USER_AGENT,
    						// USER_AGENT);
    
    					}
    				};
    
    				HttpResponseInterceptor gizpResponseInterceptor = new HttpResponseInterceptor() {
    
    					public void process(final HttpResponse response, final HttpContext context)
    							throws HttpException, IOException {
    						HttpEntity entity = response.getEntity();
    						if (entity != null) {
    							Header ceheader = entity.getContentEncoding();
    							if (ceheader != null) {
    								HeaderElement[] codecs = ceheader.getElements();
    								for (int i = 0; i < codecs.length; i++) {
    									if (codecs[i].getName().equalsIgnoreCase("gzip")) {
    										response.setEntity(new GzipDecompressingEntity(response.getEntity()));
    										return;
    									}
    								}
    							}
    						}
    					}
    				};
    
    				httpClient = HttpClients.custom().setConnectionManager(connManager).setKeepAliveStrategy(myStrategy)
    						// .setDefaultCookieStore(cookieStore)
    						.setDefaultRequestConfig(defaultRequestConfig).setRetryHandler(myRetryHandler)
    						.addInterceptorFirst(requestInterceptor).addInterceptorFirst(gizpResponseInterceptor).build();
    
    			} catch (KeyManagementException e) {
    				log.error(e.getMessage(), e);
    			} catch (NoSuchAlgorithmException e) {
    				log.error(e.getMessage(), e);
    			} catch (KeyStoreException e) {
    				log.error(e.getMessage(), e);
    			}
    		}
    
    		return httpClient;
    	}
    
    	/**
    	 * GET提交数据,并返回JSON格式的结果数据
    	 * 
    	 * @param url
    	 *            请求URL
    	 * @return JSONObject or null if error or no response
    	 */
    	public static JSONObject getForJsonResult(String reqUrl) {
    		return getForJsonResult(reqUrl, null);
    	}
    
    	/**
    	 * GET提交数据,并返回JSON格式的结果数据
    	 * 
    	 * @param url
    	 *            请求URL
    	 * @param 请求参数MAP
    	 * @return JSONObject or null if error or no response
    	 */
    	public static JSONObject getForJsonResult(String reqUrl, Map<String, String> params) {
    		try {
    			if (params != null) {
    				reqUrl = buildReqUrl(reqUrl, params);
    			}
    			return getHttpClient().execute(new HttpGet(reqUrl), new JsonResponseHandler());
    		} catch (ClientProtocolException e) {
    			log.error(e.getMessage(), e);
    		} catch (IOException e) {
    			log.warn(e.getMessage(), e);
    		} catch (Exception e) {
    			log.error(e.getMessage(), e);
    		}
    		return null;
    	}
    
    	/**
    	 * GET提交并返回XML数据
    	 * 
    	 * @param url
    	 *            请求URL
    	 * @return org.w3c.dom.Document or null
    	 */
    	public static Document getForXmlResult(String reqUrl) {
    
    		return getForXmlResult(reqUrl, null);
    	}
    
    	/**
    	 * GET提交并返回XML数据
    	 * 
    	 * @param url
    	 *            请求URL
    	 * @param params
    	 *            请求参数MAP
    	 * @return org.w3c.dom.Document or null
    	 */
    	public static Document getForXmlResult(String reqUrl, Map<String, String> params) {
    		try {
    			if (params != null) {
    				reqUrl = buildReqUrl(reqUrl, params);
    			}
    			return getHttpClient().execute(new HttpGet(reqUrl), new XmlResponseHandler());
    		} catch (ClientProtocolException e) {
    			log.error(e.getMessage(), e);
    		} catch (IOException e) {
    			log.warn(e.getMessage(), e);
    		} catch (Exception e) {
    			log.error(e.getMessage(), e);
    		}
    		return null;
    	}
    
    	/**
    	 * GET提交并返回String数据
    	 * 
    	 * @param url
    	 *            请求URL
    	 * @return String or null
    	 */
    	public static String getForStringResult(String reqUrl) {
    
    		return getForStringResult(reqUrl, null);
    	}
    
    	/**
    	 * GET提交并返回String数据
    	 * 
    	 * @param url
    	 *            请求URL
    	 * @param params
    	 *            请求参数MAP
    	 * @return String or null
    	 */
    	public static String getForStringResult(String reqUrl, Map<String, String> params) {
    		try {
    			if (params != null) {
    				reqUrl = buildReqUrl(reqUrl, params);
    			}
    			return getHttpClient().execute(new HttpGet(reqUrl), new StringResponseHandler());
    		} catch (ClientProtocolException e) {
    			log.error(e.getMessage(), e);
    		} catch (IOException e) {
    			log.warn(e.getMessage(), e);
    		} catch (Exception e) {
    			log.error(e.getMessage(), e);
    		}
    		return null;
    	}
    
    	/**
    	 * POST提交数据,并返回JSON格式的结果数据
    	 * 
    	 * @param url
    	 *            请求URL
    	 * @return JSONObject or null if error or no response
    	 */
    	public static JSONObject postForJsonResult(String url) {
    
    		return postForJsonResult(url, null);
    	}
    
    	/**
    	 * POST提交数据,并返回JSON格式的结果数据
    	 * 
    	 * @param url
    	 *            请求URL
    	 * @param 请求参数MAP
    	 * @return JSONObject or null if error or no response
    	 */
    	public static JSONObject postForJsonResult(String url, Map<String, String> params) {
    		try {
    			HttpPost post = new HttpPost(url);
    
    			if (params != null) {
    				post.setEntity(buildUrlEncodedFormEntity(params));
    			}
    			return getHttpClient().execute(post, new JsonResponseHandler());
    		} catch (ClientProtocolException e) {
    			log.error(e.getMessage(), e);
    		} catch (IOException e) {
    			log.warn(e.getMessage(), e);
    		} catch (Exception e) {
    			log.error(e.getMessage(), e);
    		}
    		return null;
    	}
    
    	/**
    	 * POST提交JSON数据,并返回JSON格式的结果数据
    	 * 
    	 * @param url
    	 *            请求URL
    	 * @param jsonDataStr
    	 *            jsonData String
    	 * @return JSONObject or null if error or no response
    	 */
    	public static JSONObject postJsonDataForJsonResult(String url, String jsonDataStr) {
    		System.err.println("222222");
    		try {
    			HttpPost post = new HttpPost(url);
    			
    			if (jsonDataStr != null) {
    				StringEntity reqEntity = new StringEntity(jsonDataStr, Consts.UTF_8);
    				reqEntity.setContentType(JSON_CONTENT_TYPE);
    				post.setEntity(reqEntity);
    			}
    
    			return getHttpClient().execute(post, new JsonResponseHandler());
    		} catch (ClientProtocolException e) {
    			log.error(e.getMessage(), e);
    		} catch (IOException e) {
    			log.warn(e.getMessage(), e);
    		} catch (Exception e) {
    			log.error(e.getMessage(), e);
    		}
    		return null;
    	}
    
    	/**
    	 * POST提交并返回XML数据
    	 * 
    	 * @param url
    	 *            请求URL
    	 * @return org.w3c.dom.Document or null
    	 */
    	public static Document postForXmlResult(String url) {
    
    		return postForXmlResult(url, null, "utf-8");
    	}
    
    	/**
    	 * POST提交并返回XML数据
    	 * 
    	 * @param url
    	 *            请求URL
    	 * @param params
    	 *            请求参数MAP
    	 * @return org.w3c.dom.Document or null
    	 */
    	public static Document postForXmlResult(String url, Map<String, String> params) {
    		try {
    			HttpPost post = new HttpPost(url);
    
    			if (params != null) {
    				post.setEntity(buildUrlEncodedFormEntity(params));
    			}
    			return getHttpClient().execute(post, new XmlResponseHandler());
    		} catch (ClientProtocolException e) {
    			log.error(e.getMessage(), e);
    		} catch (IOException e) {
    			log.warn(e.getMessage(), e);
    		} catch (Exception e) {
    			log.error(e.getMessage(), e);
    		}
    		return null;
    	}
    
    	/**
    	 * POST提交并返回XML数据
    	 * 
    	 * @param url
    	 *            请求URL
    	 * @param params
    	 *            请求参数MAP
    	 * @return org.w3c.dom.Document or null
    	 */
    	public static Document postForXmlResult(String url, Map<String, String> params, String charset) {
    		try {
    			HttpPost post = new HttpPost(url);
    
    			if (params != null) {
    				post.setEntity(buildUrlEncodedFormEntity(params, charset));
    			}
    			return getHttpClient().execute(post, new XmlResponseHandler());
    		} catch (ClientProtocolException e) {
    			log.error(e.getMessage(), e);
    		} catch (IOException e) {
    			log.warn(e.getMessage(), e);
    		} catch (Exception e) {
    			log.error(e.getMessage(), e);
    		}
    		return null;
    	}
    
    	/**
    	 * POST提交并返回String数据
    	 * 
    	 * @param url
    	 *            请求URL
    	 * @return String or null
    	 */
    	public static String postForStringResult(String url) {
    
    		return postForStringResult(url, null);
    	}
    
    	/**
    	 * POST提交并返回String数据
    	 * 
    	 * @param url
    	 *            请求URL
    	 * @return String or null
    	 */
    	public static String postXmlForStringResult(String url, String xml, String charset) {
    		try {
    			HttpPost post = new HttpPost(url);
    			if (charset == null) {
    				charset = "utf-8";
    			}
    			if (xml != null) {
    				StringEntity myEntity = new StringEntity(xml, charset);
    				myEntity.setContentType("application/xml;charset=" + charset);
    				// post.addHeader("Content-Type", "text/xml");
    				post.setEntity(myEntity);
    			}
    			return getHttpClient().execute(post, new StringResponseHandler(charset));
    		} catch (ClientProtocolException e) {
    			log.error(e.getMessage(), e);
    		} catch (IOException e) {
    			e.printStackTrace();
    			log.warn(e.getMessage(), e);
    		} catch (Exception e) {
    			log.error(e.getMessage(), e);
    		}
    		return null;
    	}
    
    	/**
    	 * POST提交并返回String数据
    	 * 
    	 * @param url
    	 *            请求URL
    	 * @param params
    	 *            请求参数MAP
    	 * @return String or null
    	 */
    	public static String postForStringResult(String url, Map<String, String> params) {
    		try {
    			HttpPost post = new HttpPost(url);
    
    			if (params != null) {
    				post.setEntity(buildUrlEncodedFormEntity(params));
    			}
    			return getHttpClient().execute(post, new StringResponseHandler());
    		} catch (ClientProtocolException e) {
    			log.error(e.getMessage(), e);
    		} catch (IOException e) {
    			log.warn(e.getMessage(), e);
    		} catch (Exception e) {
    			log.error(e.getMessage(), e);
    		}
    		return null;
    	}
    
    	/**
    	 * POST提交并返回String数据
    	 * 
    	 * @param url
    	 *            请求URL
    	 * @param params
    	 *            请求参数MAP
    	 * @return String or null
    	 */
    	public static String postForStringResult(String url, Map<String, String> params, String charset) {
    		try {
    			HttpPost post = new HttpPost(url);
    
    			if (params != null) {
    				post.setEntity(buildUrlEncodedFormEntity(params, charset));
    			}
    			return getHttpClient().execute(post, new StringResponseHandler(charset));
    		} catch (ClientProtocolException e) {
    			log.error(e.getMessage(), e);
    		} catch (IOException e) {
    			log.warn(e.getMessage(), e);
    		} catch (Exception e) {
    			log.error(e.getMessage(), e);
    		}
    		return null;
    	}
    
    	/**
    	 * 上传微信媒体文件
    	 * 
    	 * @param url
    	 * @param file
    	 * @return
    	 */
    	public static String postWeiXinMedia(String url, File file) {
    		return postMultipartForm(url, "media", file);
    	}
    
    	/**
    	 * 文件上传
    	 * 
    	 * @param url
    	 * @param file
    	 * @return
    	 */
    	public static String postMultipartForm(String url, File file) {
    		return postMultipartForm(url, "upFile", file);
    	}
    
    	/**
    	 * 文件上传
    	 * 
    	 * @param url
    	 * @param keyName
    	 * @param file
    	 * @return
    	 */
    	public static String postMultipartForm(String url, String keyName, File file) {
    
    		return postMultipartForm(url, keyName, file, null);
    	}
    
    	/**
    	 * 文件上传
    	 * 
    	 * @param url
    	 * @param keyName
    	 * @param file
    	 * @param fileName
    	 * @return
    	 */
    	public static String postMultipartForm(String url, String keyName, File file, String fileName) {
    
    		return postMultipartForm(url, keyName, file, fileName, null);
    	}
    
    	/**
    	 * 文件上传(使用表单)
    	 * 
    	 * @param url
    	 *            请求URL
    	 * @param keyName
    	 *            上传表单的文件域名称
    	 * @param file
    	 *            要上传的文件
    	 * @param fileName
    	 *            文件名
    	 * @param params
    	 *            请求参数MAP
    	 * @return String or null
    	 */
    	public static String postMultipartForm(String url, String keyName, File file, String fileName,
    			Map<String, String> params) {
    
    		if (file == null || !file.isFile() || !file.canRead()) {
    			log.error("File is null or file can't read!");
    			return null;
    		}
    
    		if (keyName == null) {
    			log.error("keyName is null!");
    			return null;
    		}
    
    		try {
    			HttpPost httpPost = new HttpPost(url);
    
    			if (fileName == null)
    				fileName = file.getName();
    
    			FileBody bin = new FileBody(file, DEFAULT_BINARY_CONTENT_TYPE, fileName);
    
    			MultipartEntityBuilder reqEntity = MultipartEntityBuilder.create();
    
    			reqEntity.addPart(keyName, bin);
    			// reqEntity.addPart("filename", new StringBody(file.getName(),
    			// UTF8_TEXT_PLAIN_CONTENT_TYPE));
    			// reqEntity.addTextBody("filelength", file.length()+"");
    
    			if (params != null) {
    				for (Map.Entry<String, String> entry : params.entrySet()) {
    					String value = entry.getValue();
    
    					if (value != null)
    						reqEntity.addPart(entry.getKey(), new StringBody(value, UTF8_TEXT_PLAIN_CONTENT_TYPE));
    				}
    			}
    
    			httpPost.setEntity(reqEntity.build());
    
    			CloseableHttpResponse response = getHttpClient().execute(httpPost);
    
    			try {
    				HttpEntity resEntity = response.getEntity();
    
    				String resp = null;
    
    				if (resEntity != null) {
    					resp = EntityUtils.toString(resEntity, Consts.UTF_8);
    				}
    				EntityUtils.consume(resEntity);
    
    				return resp;
    			} finally {
    				response.close();
    			}
    		} catch (Exception e) {
    			log.error(e.getMessage(), e);
    		}
    
    		return null;
    	}
    
    	public static String buildReqUrl(String reqUrl, Map<String, String> params) {
    		if (reqUrl == null || params == null)
    			return null;
    
    		String[] reqUrls = reqUrl.split("\\?");
    
    		StringBuilder sp = new StringBuilder();
    
    		sp.append(reqUrls[0]).append("?");
    
    		List<NameValuePair> parameters = new ArrayList<NameValuePair>(params.size());
    
    		for (Map.Entry<String, String> entry : params.entrySet()) {
    			parameters.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
    		}
    
    		sp.append(URLEncodedUtils.format(parameters, Consts.UTF_8));
    
    		return sp.toString();
    	}
    
    	public static UrlEncodedFormEntity buildUrlEncodedFormEntity(Map<String, String> params)
    			throws ClientProtocolException, UnsupportedEncodingException {
    		return buildUrlEncodedFormEntity(params, "utf-8");
    	}
    
    	public static UrlEncodedFormEntity buildUrlEncodedFormEntity(Map<String, String> params, String charset)
    			throws ClientProtocolException, UnsupportedEncodingException {
    		if (params == null)
    			throw new ClientProtocolException("Params is null");
    
    		List<NameValuePair> parameters = new ArrayList<NameValuePair>(params.size());
    
    		for (Map.Entry entry : params.entrySet()) {
    			parameters.add(new BasicNameValuePair(String.valueOf(entry.getKey()), String.valueOf(entry.getValue())));
    		}
    
    		return new UrlEncodedFormEntity(parameters, charset);
    	}
    
    	/**
    	 * 向指定 URL 发送POST方法的请求
    	 * 
    	 * @param url
    	 *            发送请求的 URL
    	 * @param param
    	 *            请求參数，请求參数应该是 name1=value1&name2=value2 的形式。
    	 * @return 所代表远程资源的响应结果
    	 */
    	public static String sendPost(String url, String param) {
    		PrintWriter out = null;
    		BufferedReader in = null;
    		String result = "";
    		try {
    			URL realUrl = new URL(url);
    			// 打开和URL之间的连接
    			URLConnection conn = realUrl.openConnection();
    			// 设置通用的请求属性
    			conn.setRequestProperty("accept", "*/*");
    			conn.setRequestProperty("connection", "Keep-Alive");
    			conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
    			// 发送POST请求必须设置例如以下两行
    			conn.setDoOutput(true);
    			conn.setDoInput(true);
    			// 获取URLConnection对象相应的输出流
    			out = new PrintWriter(conn.getOutputStream());
    			// 发送请求參数
    			out.print(param);
    			// flush输出流的缓冲
    			out.flush();
    			// 定义BufferedReader输入流来读取URL的响应
    			in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
    			String line;
    			while ((line = in.readLine()) != null) {
    				result += line;
    			}
    		} catch (Exception e) {
    			System.out.println("发送 POST 请求出现异常。" + e);
    			e.printStackTrace();
    		}
    		// 使用finally块来关闭输出流、输入流
    		finally {
    			try {
    				if (out != null) {
    					out.close();
    				}
    				if (in != null) {
    					in.close();
    				}
    			} catch (IOException ex) {
    				ex.printStackTrace();
    			}
    		}
    		return result;
    	}
    
    }

6，完整的http工具类：[https://download.csdn.net/download/baidu\_38226233/11228610][https_download.csdn.net_download_baidu_38226233_11228610]

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[20190606113001743.png]: /images/20220122/ee51cf7999f448d7ac4e4ba78d1aaa53.png
[https_download.csdn.net_download_baidu_38226233_11228610]: https://download.csdn.net/download/baidu_38226233/11228610