最近差点被业务逻辑搞懵逼，果然要先花时间思考，确定好流程再执行。目前最好用的jar包还是org.apache.http。
public class HttpClientHelper { private RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(15000).setConnectTimeout(15000) .setConnectionRequestTimeout(15000).build(); private static HttpClientHelper instance = null; public HttpClientHelper() { } public static HttpClientHelper getInstance() { if (instance == null) { instance = new HttpClientHelper(); } return instance; } /** * 发送 post请求 * * @param httpUrl * 地址 */ public String sendHttpPost(String httpUrl) { HttpPost httpPost = new HttpPost(httpUrl);// 创建httpPost return sendHttpPost(httpPost); } /** * 发送 post请求 * * @param httpUrl * 地址 * @param params * 参数(格式:key1=value1&key2=value2) */ public String sendHttpPost(String httpUrl, String params) { HttpPost httpPost = new HttpPost(httpUrl);// 创建httpPost try { // 设置参数 StringEntity stringEntity = new StringEntity(params, "UTF-8"); stringEntity.setContentType("application/x-www-form-urlencoded"); httpPost.setEntity(stringEntity); } catch (Exception e) { e.printStackTrace(); } return sendHttpPost(httpPost); } /** * 发送 post请求 * * @param httpUrl * 地址 * @param maps * 参数 */ public String sendHttpPost(String httpUrl, Map<String, String> maps) { HttpPost httpPost = new HttpPost(httpUrl);// 创建httpPost // 创建参数队列 List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(); for (String key : maps.keySet()) { nameValuePairs.add(new BasicNameValuePair(key, maps.get(key))); } try { httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs, "UTF-8")); } catch (Exception e) { e.printStackTrace(); } return sendHttpPost(httpPost); } /** * 发送 post请求（带文件） * * @param httpUrl * 地址 * @param maps * 参数 * @param fileLists * 附件 */ public String sendHttpPost(String httpUrl, Map<String, String> maps, List<File> fileLists) { HttpPost httpPost = new HttpPost(httpUrl);// 创建httpPost MultipartEntityBuilder meBuilder = MultipartEntityBuilder.create(); if (maps != null) { for (String key : maps.keySet()) { meBuilder.addPart(key, new StringBody(maps.get(key), ContentType.TEXT_PLAIN)); } } if (fileLists != null) { for (File file : fileLists) { FileBody fileBody = new FileBody(file); meBuilder.addPart("files", fileBody); } } HttpEntity reqEntity = meBuilder.build(); httpPost.setEntity(reqEntity); return sendHttpPost(httpPost); } /** * 发送Post请求 * * @param httpPost * @return */ private String sendHttpPost(HttpPost httpPost) { CloseableHttpClient httpClient = null; CloseableHttpResponse response = null; HttpEntity entity = null; String responseContent = null; try { // 创建默认的httpClient实例. httpClient = HttpClients.createDefault(); httpPost.setConfig(requestConfig); // 执行请求 response = httpClient.execute(httpPost); entity = response.getEntity(); responseContent = EntityUtils.toString(entity, "UTF-8"); } catch (Exception e) { e.printStackTrace(); } finally { try { // 关闭连接,释放资源 if (response != null) { response.close(); } if (httpClient != null) { httpClient.close(); } } catch (IOException e) { e.printStackTrace(); } } return responseContent; } public String sendJsonHttpPost(String url, String json) { CloseableHttpClient httpclient = HttpClients.createDefault(); String responseInfo = null; try { HttpPost httpPost = new HttpPost(url); httpPost.addHeader("Content-Type", "application/json;charset=UTF-8"); ContentType contentType = ContentType.create("application/json", CharsetUtils.get("UTF-8")); httpPost.setEntity(new StringEntity(json, contentType)); CloseableHttpResponse response = httpclient.execute(httpPost); HttpEntity entity = response.getEntity(); int status = response.getStatusLine().getStatusCode(); if (status >= 200 && status < 300) { if (null != entity) { responseInfo = EntityUtils.toString(entity); } } } catch (Exception e) { e.printStackTrace(); } finally { try { httpclient.close(); } catch (IOException e) { e.printStackTrace(); } } return responseInfo; } /** * 发送 get请求 * * @param httpUrl */ public String sendHttpGet(String httpUrl) { HttpGet httpGet = new HttpGet(httpUrl);// 创建get请求 return sendHttpGet(httpGet); } /** * 发送 get请求Https * * @param httpUrl */ public String sendHttpsGet(String httpUrl) { HttpGet httpGet = new HttpGet(httpUrl);// 创建get请求 return sendHttpsGet(httpGet); } /** * 发送Get请求 * * @param httpGet * @return */ private String sendHttpGet(HttpGet httpGet) { CloseableHttpClient httpClient = null; CloseableHttpResponse response = null; HttpEntity entity = null; String responseContent = null; try { // 创建默认的httpClient实例. httpClient = HttpClients.createDefault(); httpGet.setConfig(requestConfig); // 执行请求 response = httpClient.execute(httpGet); entity = response.getEntity(); responseContent = EntityUtils.toString(entity, "UTF-8"); } catch (Exception e) { e.printStackTrace(); } finally { try { // 关闭连接,释放资源 if (response != null) { response.close(); } if (httpClient != null) { httpClient.close(); } } catch (IOException e) { e.printStackTrace(); } } return responseContent; } /** * 发送Get请求Https * * @param httpGet * @return */ private String sendHttpsGet(HttpGet httpGet) { CloseableHttpClient httpClient = null; CloseableHttpResponse response = null; HttpEntity entity = null; String responseContent = null; try { // 创建默认的httpClient实例. PublicSuffixMatcher publicSuffixMatcher = PublicSuffixMatcherLoader .load(new URL(httpGet.getURI().toString())); DefaultHostnameVerifier hostnameVerifier = new DefaultHostnameVerifier(publicSuffixMatcher); httpClient = HttpClients.custom().setSSLHostnameVerifier(hostnameVerifier).build(); httpGet.setConfig(requestConfig); // 执行请求 response = httpClient.execute(httpGet); entity = response.getEntity(); responseContent = EntityUtils.toString(entity, "UTF-8"); } catch (Exception e) { e.printStackTrace(); } finally { try { // 关闭连接,释放资源 if (response != null) { response.close(); } if (httpClient != null) { httpClient.close(); } } catch (IOException e) { e.printStackTrace(); } } return responseContent; } public static void main(String[] args) { HttpClientHelper h = new HttpClientHelper(); Map map = new HashMap(); map.put("messageid", "test00201612210002"); map.put("clientid", "test00"); map.put("index_id", "买方会员"); map.put("threshold", 0.9); List<String> data = new ArrayList<String>(); data.add("wo xiang cha xun jin tian de yao pin jia ge lie biao"); map.put("data", data); String json = JSON.toJSONString(map); String reply = h.sendJsonHttpPost("http://11.11.40.63:7777/algor/simclassify", json); System.out.println("reply->"+reply); } }
java里遍历动态key:
LinkedHashMap<String, String> jsonMap = JSON.parseObject(jsonStr,new TypeReference<LinkedHashMap<String, String>>() {}); for (Map.Entry<String, String> entry : jsonMap.entrySet()) { if (Float.valueOf(entry2.getValue()) > tempValue) { key = entry.getKey()); value= entry.getValue(); } }