httpClient中get、post详细示例
1.需要引用以下依赖
<dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> </dependency> <dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpmime</artifactId> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> </dependency>
2.httpUtil帮助类
public class HttpUtil { private static final Log logger = LogFactory.getLog(HttpUtil.class); public static final int Format_KeyValue = 0; public static final int Format_Json = 1; private static RequestConfig requestConfig = RequestConfig.custom().setCookieSpec(CookieSpecs.STANDARD_STRICT) .setExpectContinueEnabled(Boolean.TRUE) .setTargetPreferredAuthSchemes(Arrays.asList(AuthSchemes.NTLM, AuthSchemes.DIGEST)) .setProxyPreferredAuthSchemes(Arrays.asList(AuthSchemes.BASIC)).build(); /** * 创建HttpClient客户端 * @param isHttps * @return */ public static CloseableHttpClient createClient(boolean isHttps) { if (isHttps) { try { KeyStore trustStore = KeyStore.getInstance(KeyStore.getDefaultType()); FileInputStream instream = new FileInputStream(new File("D:/ssl/test.keystore")); trustStore.load(instream, "test".toCharArray()); // Trust own CA and all self-signed certs SSLContext sslContext = SSLContexts.custom().loadTrustMaterial(trustStore, new TrustSelfSignedStrategy()).build(); SSLConnectionSocketFactory socketFactory = new SSLConnectionSocketFactory(sslContext,NoopHostnameVerifier.INSTANCE); Registry<ConnectionSocketFactory> socketFactoryRegistry = RegistryBuilde . <ConnectionSocketFactory>create().register("http", PlainConnectionSocketFactory.INSTA. register("https", socketFactory).build(); // 创建ConnectionManager，添加Connection配置信息 PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager( socketFactoryRegistry); CloseableHttpClient closeableHttpClient = HttpClients.custom().setConnectionManager(connectionManager) .setDefaultRequestConfig(requestConfig).build(); return closeableHttpClient; } catch (KeyManagementException e) { e.printStackTrace(); logger.error("创建HTTPS客户端异常"); throw new RuntimeException(e); } catch (NoSuchAlgorithmException e) { throw new RuntimeException(e); } catch (CertificateException e) { logger.error("创建HTTPS客户端异常"); e.printStackTrace(); throw new RuntimeException(e); } catch (IOException e) { e.printStackTrace(); throw new RuntimeException(e); } catch (KeyStoreException e) { e.printStackTrace(); throw new RuntimeException(e); } } else { return HttpClientBuilder.create().build(); } } /** * 调用Get接口 * @param url 接口地址 * @return */ public static String sendGet(String url) { return sendGet(url, createClient(true)); } /** * 调用Get接口 * @param url 接口地址 * @param httpClient * @return */ public static String sendGet(String url, CloseableHttpClient httpClient) { if (url == null || "".equals(url)) { logger.error("接口地址为空"); return null; } HttpGet request = null; try { request = new HttpGet(url); if (httpClient == null) { logger.error("HttpClient实例为空"); return null; } request.addHeader("Content-Type","application/json;charset=UTF-8"); request.setHeader("Accept","application/json"); CloseableHttpResponse response = httpClient.execute(request); if (response.getStatusLine().getStatusCode() == 200) { return EntityUtils.toString(response.getEntity()); } } catch (Exception e) { logger.error("访问接口失败，接口地址为：" + url); } finally { if (request != null) request.releaseConnection(); } return null; } /** * 调用Post接口 * @param httpClient * @param url 接口地址 * @param entity * @return */ public static String sendPost(CloseableHttpClient httpClient, String url, StringEntity entity) { if (url == null || "".equals(url)) { logger.error("接口地址为空"); return null; } HttpPost request = null; try { request = new HttpPost(url); if (httpClient == null) { logger.error("HttpClient实例为空"); return null; } request.setEntity(entity); request.addHeader("Content-Type","application/json;charset=UTF-8"); request.setHeader("Accept","application/json"); CloseableHttpResponse response = httpClient.execute(request); if (response.getStatusLine().getStatusCode() == 200) { return EntityUtils.toString(response.getEntity()); } } catch (Exception e) { logger.error("访问接口失败，接口地址为：" + url); } finally { if (request != null) request.releaseConnection(); } return null; } /** * 调用Post接口 * @param httpClient * @param url 接口地址 * @param user * @return */ public static String sendPost(CloseableHttpClient httpClient, String url, User user) { StringEntity entity = new StringEntity(JSON.toJSONString(user), "UTF-8"); return sendPost(httpClient,url,entity); } public static InputStream downloadRemoteFile(CloseableHttpClient httpClient,String apiUrl,User user) { InputStream is = null; HttpPost request = new HttpPost(apiUrl); try { if (httpClient == null) { return null; } StringEntity entity = new StringEntity(JSON.toJSONString(user), "UTF-8"); request.setEntity(entity); request.addHeader("Content-Type","application/json;charset=UTF-8"); request.setHeader("Accept","application/json"); CloseableHttpResponse httpResponse = httpClient.execute(request); int statusCode = httpResponse.getStatusLine().getStatusCode(); if (statusCode == HttpStatus.SC_OK) { HttpEntity result = httpResponse.getEntity(); if (null != result) { // 获取返回内容 is = result.getContent(); } } else if(statusCode != HttpStatus.SC_OK && statusCode != HttpStatus.SC_CREATED){ request.abort(); } } catch (Exception e) { e.printStackTrace(); } return is; } }
/** *post方法 *formdata参数 */ public static ResultData<String> sendPostFormData(String url, Map<String,String> params) { ResultData<String> rt = new ResultData<String>(-1); if (StringUtils.isBlank(url)) { rt.setMessage("接口地址为空"); return rt; } CloseableHttpClient httpClient = null; try { httpClient = HttpUtil.createClient(isSSL(url)); } catch (Exception e) { rt.setMessage("创建HttpClient实例失败，失败原因：" + e); return rt; } if (null == httpClient) { rt.setMessage("HttpClient实例为空"); return rt; } HttpPost request = null; CloseableHttpResponse response = null; try { List<NameValuePair> nvp = new ArrayList<NameValuePair>(); Set<String> keySet = params.keySet(); for(String key : keySet){ nvp.add(new BasicNameValuePair(key, params.get(key))); } request = new HttpPost(url); request.setEntity(new UrlEncodedFormEntity(nvp,"UTF-8")); request.setHeader("Accept", "application/json"); request.addHeader("Content-Type", "application/x-www-form-urlencoded;charset=UTF-8"); response = httpClient.execute(request); if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) { rt.setData(EntityUtils.toString(response.getEntity())); rt.setMessage("访问接口成功"); rt.setStatus(0); } else { rt.setMessage("访问接口失败，失败原因：" + response.toString()); } } catch (Exception e) { rt.setMessage(e.toString()); } finally { if (request != null) { request.releaseConnection(); } if (response != null) { try { response.close(); } catch (IOException e) {} } } return rt; }
3.service业务层调用
public class testService(){ //调用sendGet public Test testSendGet(long id){ Test test= new Test(); String url ="https://TestProject/restful/queryById?Id=" + Id; String rString = HttpUtil.sendGet(url); if(null != rString && !rString.isEmpty() && !rString.equals("[]")) { test = JSONObject.parseObject(rString,Test.class); } } //调用sendPost public Test testSendPost(PageInfo<Test> page,long id){ List<Test> list= new ArrayList<Test>); CloseableHttpClient client = HttpUtil.createClient(true); String url ="https://TestProject/restful/all?Id=" + Id; String rString = HttpUtil.sendPost(client,url,page);; if(null != rString && !rString.isEmpty() && !rString.equals("[]")) { list = JSONObject.parseArray(rString,Test.class); } } //调用downloadRemoteFile下载文件 public void testDownloadRemoteFile(User user,long id){ List<Test> list= new ArrayList<Test>); CloseableHttpClient client = HttpUtil.createClient(true); String url ="https://TestProject/restful/downloads?Id=" + Id; InputStream inputStream = HttpUtil.downloadRemoteFile(client,url,user); OutputStream outputStream = null; // 打开目的输入流，不存在则会创建 File file = new File(SbConstants.BASELINE_DOWNLOAD_DIR + relativePath); // 判断文件夹是否存在 if (!file.exists()) { // 如果文件夹不存在，则创建新的的文件夹 file.mkdirs(); } long beginTime = System.currentTimeMillis(); try { outputStream = new FileOutputStream(SbConstants.BASELINE_DOWNLOAD_DIR + baseline.getFilePath()); } catch (FileNotFoundException e) { e.printStackTrace(); } // 将输入流is写入文件输出流fos中 byte[] bytes = new byte[1024]; try { int ch = inputStream.read(bytes, 0, 1024); while (ch != -1) { outputStream.write(bytes); ch = inputStream.read(bytes, 0, 1024); } } catch (IOException e1) { e1.printStackTrace(); } finally { // 关闭输入流等（略） try { outputStream.close(); inputStream.close(); } catch (IOException e) { e.printStackTrace(); } } } }
