java 接口調用
阿新 • • 發佈:2018-05-08
adl finall .get ioe 輸入 all catch http last
生產中遇到過這種問題,記錄下java的接口調用問題。
一種是json方式;
public static String sendPost(String url, JSONObject obj)throws IOException{ OutputStreamWriter out = null; BufferedReader reader = null; String response=""; /* String paramStr = ""; if (null != param) { //遍歷參數Map添加到集合中 Set<String> keySet = param.keySet(); for (String key : keySet) { paramStr = paramStr + key + ":" + param.get(key) + "&"; } } int lastAndIndex = paramStr.lastIndexOf("&"); if (lastAndIndex != -1) { paramStr = paramStr.substring(0, lastAndIndex); } System.out.println("地址===" + url); System.out.println("入參===" + paramStr);*/ try { URL httpUrl = null; //HTTP URL類 用這個類來創建連接 //創建URL httpUrl = new URL(url); //建立連接 HttpURLConnection conn = (HttpURLConnection) httpUrl.openConnection(); conn.setRequestProperty("accept", "*/*");// 設置通用的請求屬性 conn.setRequestProperty("Charset", "UTF-8"); conn.setRequestMethod("POST"); conn.setRequestProperty("Content-Type", "application/json"); conn.setRequestProperty("connection", "keep-alive"); conn.setUseCaches(false);//設置不要緩存 conn.setInstanceFollowRedirects(true); conn.setDoOutput(true); conn.setDoInput(true); conn.connect(); //POST請求 out = new OutputStreamWriter( conn.getOutputStream()); out.write(obj.toJSONString()); out.flush(); //讀取響應 reader = new BufferedReader(new InputStreamReader( conn.getInputStream())); String lines; while ((lines = reader.readLine()) != null) { lines = new String(lines.getBytes(), "utf-8"); response+=lines; } reader.close(); // 斷開連接 conn.disconnect(); } catch (Exception e) { System.out.println("發送 POST 請求出現異常!"+e); e.printStackTrace(); } //使用finally塊來關閉輸出流、輸入流 finally{ try{ if(out!=null){ out.close(); } if(reader!=null){ reader.close(); } } catch(IOException ex){ ex.printStackTrace(); } } return response; }
再來一個普通的str 調用接口;
/** * 向指定 URL 發送POST方法的請求 * @param url 發送請求的 URL * @param param 請求參數,請求參數應該是 name1=value1&name2=value2 的形式。 * @return 所代表遠程資源的響應結果 */ public static String sendPostWebReq(String url, Map<String, Object> param,int i) throws Exception { String paramStr = ""; if (null != param) { //遍歷參數Map添加到集合中 Set<String> keySet = param.keySet(); for (String key : keySet) { paramStr = paramStr + key + "=" + param.get(key) + "&"; } } int lastAndIndex = paramStr.lastIndexOf("&"); if (lastAndIndex != -1) { paramStr = paramStr.substring(0, lastAndIndex); } System.out.println("地址===" + url); System.out.println("入參===" + paramStr); PrintWriter out = null; BufferedReader in = null; String result = ""; try { URL realUrl = new URL(url); HttpURLConnection conn = (HttpURLConnection) realUrl.openConnection();// 打開和URL之間的連接 conn.setRequestProperty("accept", "*/*");// 設置通用的請求屬性 conn.setRequestProperty("Content-Type", "application/json"); conn.setRequestProperty("connection", "Keep-Alive"); conn.setRequestProperty("Charset", "UTF-8"); conn.setDoOutput(true);// 發送POST請求必須設置如下兩行 conn.setDoInput(true);// 獲取URLConnection對象對應的輸出流 out = new PrintWriter(new OutputStreamWriter(conn.getOutputStream(), "UTF-8"));// 發送請求參數 out.print(paramStr);// flush輸出流的緩沖 out.flush(); in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));// 定義BufferedReader輸入流來讀取URL的響應 String line; while ((line = in.readLine()) != null) { result += line; } } catch (Exception e) { System.out.println("發送 POST 請求出現異常!" + e); throw e; } finally { // 使用finally塊來關閉輸出流、輸入流 try { if (in != null) in.close(); } catch (IOException ex) { } if (out != null) out.close(); } return result; }
java 接口調用