java模擬post請求發送json,用兩種方式實現,第一種是HttpURLConnection發送post請求,第二種是使用httpclient模擬post請求。java
方法一:json
public static String sendPost(String url_param, String param) { String result = "";// 返回的結果 BufferedReader in = null;// 讀取響應輸入流 // PrintWriter out = null; try { // 建立URL對象 URL url = new URL(url_param); // 打開URL鏈接 java.net.HttpURLConnection httpConn = (java.net.HttpURLConnection) url .openConnection(); // 設置屬性 httpConn.setRequestProperty("Content-Type", "application/json"); // 設置POST方式 httpConn.setDoInput(true); httpConn.setDoOutput(true); httpConn.setRequestMethod("POST"); httpConn.setUseCaches(false); httpConn.setInstanceFollowRedirects(true); // 獲取HttpURLConnection對象對應的輸出流 DataOutputStream out = new DataOutputStream(httpConn.getOutputStream()); out.write(param.getBytes("utf-8")); // flush輸出流的緩衝 out.flush(); out.close(); // 定義BufferedReader輸入流來讀取URL的響應,設置編碼方式 in = new BufferedReader(new InputStreamReader(httpConn .getInputStream(), "UTF-8")); String line; // 讀取返回的內容 while ((line = in.readLine()) != null) { result += line; } } catch (Exception e) { e.printStackTrace(); } finally { try { /* if (out != null) { out.close(); } */ if (in != null) { in.close(); } } catch (IOException ex) { ex.printStackTrace(); } } return result; }
方法二:app
public String sendPost(String url, String data) { String response = null; log.info("url: " + url); log.info("request: " + data); try { CloseableHttpClient httpclient = null; CloseableHttpResponse httpresponse = null; try { httpclient = HttpClients.createDefault(); HttpPost httppost = new HttpPost(url); StringEntity stringentity = new StringEntity(data, ContentType.create("text/json", "UTF-8")); httppost.setEntity(stringentity); httpresponse = httpclient.execute(httppost); response = EntityUtils .toString(httpresponse.getEntity()); log.info("response: " + response); } finally { if (httpclient != null) { httpclient.close(); } if (httpresponse != null) { httpresponse.close(); } } } catch (Exception e) { e.printStackTrace(); } return response; }