httpclient

java-httpclient

1.maven

<!-- 主要的jar-->
<dependency>
	<groupId>org.apache.httpcomponents</groupId>
	<artifactId>httpclient</artifactId>
	<version>4.5.2</version>
</dependency>

<dependency>
	<groupId>org.projectlombok</groupId>
	<artifactId>lombok</artifactId>
	<version>1.18.10</version>
</dependency>

 <dependency>
	<groupId>org.apache.commons</groupId>
	<artifactId>commons-lang3</artifactId>
	<version>3.3.2</version>
</dependency>

<dependency>
	<groupId>commons-io</groupId>
	<artifactId>commons-io</artifactId>
	<version>2.7</version>
</dependency>

<dependency>
	<groupId>org.apache.httpcomponents</groupId>
	<artifactId>httpmime</artifactId>
	<version>4.5.2</version>
</dependency>

<dependency>
	<groupId>com.alibaba</groupId>
	<artifactId>fastjson</artifactId>
	<version>1.2.41</version>
</dependency>

<dependency>
	<groupId>com.google.code.gson</groupId>
	<artifactId>gson</artifactId>
	<version>2.8.8</version>
</dependency>

2.实例

2.1 GET

public static String doGet(String url, Map<String, String> params) {
		String result = "";
        /**
		 * RequestConfig:
		 * setSocketTimeout: socket读取数据超时时间
		 * setConnectTimeout: 与服务器链接超时时间
		 * setConnectionRequestTimeout: 从连接池获取连接的超时时间
		 */
		RequestConfig reqConfig = RequestConfig.custom()
				.setSocketTimeout(60 * 1000)
				.setConnectTimeout(10 * 1000)
				.setConnectionRequestTimeout(10 * 1000)
				.build();

		/**
		 * HttpClientBuilder:
		 * setMaxConnTotal: 连接池最大连接数
		 * setMaxConnPerRoute: 分配给同一个路由最大的并发连接数
		 * setDefaultConfig(RequestConfig)
		 */
		HttpClient httpClient = HttpClientBuilder.create()
				.setDefaultRequestConfig(reqConfig)
				.build();
		HttpGet httpGet = null;
		try {
			URIBuilder uriBuilder = new URIBuilder(url);
			if (null != params && !params.isEmpty()) {
				for (Map.Entry<String, String> entry : params.entrySet()) {
					uriBuilder.addParameter(entry.getKey(), entry.getValue());
				}
			}
			URI uri = uriBuilder.build();
			httpGet = new HttpGet(uri);
			HttpResponse response = httpClient.execute(httpGet);
			if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
				result = EntityUtils.toString(response.getEntity());
				log.info("doGetSuccess({}):{}",url, result);
			} else {
				log.error("doGetFail({}):{}", url, response.getStatusLine().getStatusCode());
			}
		} catch (Exception e) {
			log.error("doGetError({}):{}", url, ExceptionUtils.getStackTrace(e));
		} finally {
			// 释放连接
			if (null != httpGet) {
				httpGet.releaseConnection();
			}
		}
		return result;
	}

2.2 POST-Common

public static String doPost(String url, Map<String, String> params) {
		String result = "";
		RequestConfig reqConfig = RequestConfig.custom()
				.setSocketTimeout(60 * 1000)
				.setConnectTimeout(10 * 1000)
				.setConnectionRequestTimeout(10 * 1000)
				.build();

		/**
		 * HttpClientBuilder:
		 * setMaxConnTotal: 连接池最大连接数
		 * setMaxConnPerRoute: 分配给同一个路由最大的并发连接数
		 * setDefaultConfig(RequestConfig)
		 */
		HttpClient httpClient = HttpClientBuilder.create()
				.setDefaultRequestConfig(reqConfig)
				.build();
		HttpPost httpPost = new HttpPost(url);
		try { // 参数键值对
			if (null != params && !params.isEmpty()) {
				List<NameValuePair> pairs = new ArrayList<NameValuePair>();
				NameValuePair pair = null;
				for (String key : params.keySet()) {
					pair = new BasicNameValuePair(key, params.get(key));
					pairs.add(pair);
				}
				// 模拟表单
				UrlEncodedFormEntity entity = new UrlEncodedFormEntity(pairs);
				httpPost.setEntity(entity);
			}
			HttpResponse response = httpClient.execute(httpPost);
			if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
				result = EntityUtils.toString(response.getEntity(), "utf-8");
				log.info("doPostSuccess({}):{}",url, result);
			} else {
				log.error("doPostFail({}):{}", url, response.getStatusLine().getStatusCode());
			}
		} catch (Exception e) {
			log.error("doPostError({}):{}", url,ExceptionUtils.getStackTrace(e));
			e.printStackTrace();
		} finally {
			if (null != httpPost) {
				// 释放连接
				httpPost.releaseConnection();
			}
		}
		return result;
	}

2.3 POST-Json

public static String sendJson (String url, JSONObject jsonObject) {
		String result = "";

		/**
		 * RequestConfig:
		 * setSocketTimeout: socket读取数据超时时间
		 * setConnectTimeout: 与服务器链接超时时间
		 * setConnectionRequestTimeout: 从连接池获取连接的超时时间
		 */
		RequestConfig reqConfig = RequestConfig.custom()
				.setSocketTimeout(60 * 1000)
				.setConnectTimeout(10 * 1000)
				.setConnectionRequestTimeout(10 * 1000)
				.build();

		/**
		 * HttpClientBuilder:
		 * setMaxConnTotal: 连接池最大连接数
		 * setMaxConnPerRoute: 分配给同一个路由最大的并发连接数
		 * setDefaultConfig(RequestConfig)
		 */
		HttpClient httpClient = HttpClientBuilder.create()
				.setDefaultRequestConfig(reqConfig)
				.build();
		HttpPost httpPost = new HttpPost(url);
		try {
			httpPost.addHeader("Content-type", "application/json;charset=utf-8");
			httpPost.setHeader("Accept", "application/json");
			if (StringUtils.isNotBlank(jsonObject.toString())) {
				httpPost.setEntity(new StringEntity(jsonObject.toString(), StandardCharsets.UTF_8));
			}
			HttpResponse response = httpClient.execute(httpPost);
			if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
				HttpEntity entity = response.getEntity();
				if (entity != null){
//					result = EntityUtils.toString(entity, "utf-8");
					result = JSONObject.parseObject(EntityUtils.toString(entity, StandardCharsets.UTF_8)).toJSONString();
				}
			}else {
				log.error("sendJsonFail({}):{}",url, response.getStatusLine().getStatusCode());
			}
		} catch (Exception e) {
			log.error("sendJsonError({}):{}",url, ExceptionUtils.getStackTrace(e));
		}finally {
			if (null != httpPost) {
				// 释放连接
				httpPost.releaseConnection();
			}
		}
		return result;
	}

2.4 POST-File

public static String sendFilePost(String url, Map<String, ContentBody> reqParam){
		CloseableHttpClient httpclient = HttpClients.createDefault();
		CloseableHttpResponse response = null;
		try {
			// 创建http
			HttpPost httppost = new HttpPost(url);
			/**
			 * RequestConfig:
			 * setSocketTimeout: socket读取数据超时时间
			 * setConnectTimeout: 与服务器链接超时时间
			 * setConnectionRequestTimeout: 从连接池获取连接的超时时间
			 */
			RequestConfig reqConfig = RequestConfig.custom()
					.setSocketTimeout(60 * 1000)
					.setConnectTimeout(10 * 1000)
					.setConnectionRequestTimeout(10 * 1000)
					.build();
			httppost.setConfig(reqConfig);
			MultipartEntityBuilder multipartEntityBuilder = MultipartEntityBuilder.create();
			multipartEntityBuilder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
			multipartEntityBuilder.setCharset(StandardCharsets.UTF_8);
			for(Map.Entry<String,ContentBody> param : reqParam.entrySet()){
				multipartEntityBuilder.addPart(param.getKey(), param.getValue());
			}
			HttpEntity reqEntity = multipartEntityBuilder.build();
			httppost.setEntity(reqEntity);
			try {
				// 发起post请求
				response = httpclient.execute(httppost);
				// 获取响应实体
				HttpEntity entity = response.getEntity();
				if (entity != null) {
//					return EntityUtils.toString(entity, StandardCharsets.UTF_8);
					// unicode转中文
					return JSONObject.parseObject(EntityUtils.toString(entity, StandardCharsets.UTF_8)).toJSONString();
				}
			} catch (IOException e){
				e.printStackTrace();
				log.error("请求-{}-响应异常:{}", url, String.valueOf(e));
			}
		} finally {
			// 关闭连接 释放资源
			try {
				if (response != null){
					response.close();
				}
				httpclient.close();
			} catch (IOException e) {
				e.printStackTrace();
				log.error("请求-{}-内部异常:{}", url, String.valueOf(e));
			}
		}
		return null;
	}