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java後台訪問url,並傳遞資料——通過httpclient方式
需要的包,包可能多幾個額外的,如果無用或者衝突刪除即可,httpclient是使用的是4.4.1的版本:http://download.csdn.net/detail/myfmyfmyfmyf/8894191
1、無參數傳遞,以開發為例,後台訪問url串連獲得全部的人員列表
/** * 擷取全部人員列表 * @return */ public JSONObject getAllEmployee(){ //擷取號 String token=getTokenFromWx(); String dep_root=ROOT_DEP;//跟部門樹 try { CloseableHttpClient httpclient = HttpClients.createDefault(); HttpPost httpPost= new HttpPost("https://qyapi.weixin.qq.com/cgi-bin/user/list?access_token="+token+"&department_id="+dep_root+"&fetch_child="+FETCH_CHILD+"&status="+STATE); // Create a custom response handler ResponseHandler<JSONObject> responseHandler = new ResponseHandler<JSONObject>() {//成功調用串連後,對返回資料進行的操作 public JSONObject handleResponse( final HttpResponse response) throws ClientProtocolException, IOException { int status = response.getStatusLine().getStatusCode(); if (status >= 200 && status < 300) { //獲得調用成功後 返回的資料 HttpEntity entity = response.getEntity(); if(null!=entity){ String result= EntityUtils.toString(entity); //根據字串產生JSON對象 JSONObject resultObj = JSONObject.fromObject(result); return resultObj; }else{ return null; } } else { throw new ClientProtocolException("Unexpected response status: " + status); } } }; //返回的json對象 JSONObject responseBody = httpclient.execute(httpPost, responseHandler); //System.out.println(responseBody); return responseBody; }catch (Exception e) {e.printStackTrace();return null;} }
2、有參數傳遞,以開發為例,後台訪問url主動發送訊息(json資料),httpClient通過設定StringEntity對象傳遞
/** * 主動發送訊息 * @param mess * @return */ public boolean sendReqMsg(ReqBaseMessage mess){ //訊息json格式 String jsonContext=mess.toJsonStr(); //System.out.println(jsonContext); //獲得token String token=getTokenFromWx(); boolean flag=false; try { CloseableHttpClient httpclient = HttpClients.createDefault(); HttpPost httpPost= new HttpPost("https://qyapi.weixin.qq.com/cgi-bin/message/send?access_token="+token); //發送json格式的資料 StringEntity myEntity = new StringEntity(jsonContext, ContentType.create("text/plain", "UTF-8")); //設定需要傳遞的資料 httpPost.setEntity(myEntity); // Create a custom response handler ResponseHandler<JSONObject> responseHandler = new ResponseHandler<JSONObject>() { //對訪問結果進行處理 public JSONObject handleResponse( final HttpResponse response) throws ClientProtocolException, IOException { int status = response.getStatusLine().getStatusCode(); if (status >= 200 && status < 300) { HttpEntity entity = response.getEntity(); if(null!=entity){ String result= EntityUtils.toString(entity); //根據字串產生JSON對象 JSONObject resultObj = JSONObject.fromObject(result); return resultObj; }else{ return null; } } else { throw new ClientProtocolException("Unexpected response status: " + status); } } }; //返回的json對象 JSONObject responseBody = httpclient.execute(httpPost, responseHandler); System.out.println(responseBody); int result= (Integer) responseBody.get("errcode"); if(0==result){ flag=true; }else{ flag=false; }httpclient.close();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();} return flag;}
3、傳遞圖片、檔案等媒體資訊,還是以開發為例
/** * 檔案上傳到伺服器 * @param fileType 檔案類型 媒體檔案類型,分別有圖片(image)、語音(voice)、視頻(video),普通檔案(file) * @param filePath 檔案路徑 * @return JSONObject * @throws Exception */ public JSONObject send(String fileType, String filePath) throws Exception { String result = null; File file = new File(filePath); if (!file.exists() || !file.isFile()) { throw new IOException("檔案不存在"); } String token=getTokenFromWx(); /** * 第一部分 */ URL urlObj = new URL("https://qyapi.weixin.qq.com/cgi-bin/media/upload?access_token="+ token + "&type="+fileType+""); HttpURLConnection con = (HttpURLConnection) urlObj.openConnection(); con.setRequestMethod("POST"); // 以Post方式提交表單,預設get方式 con.setDoInput(true); con.setDoOutput(true); con.setUseCaches(false); // post方式不能使用緩衝 // 佈建要求頭資訊 con.setRequestProperty("Connection", "Keep-Alive"); con.setRequestProperty("Charset", "UTF-8"); // 設定邊界 String BOUNDARY = "----------" + System.currentTimeMillis(); con.setRequestProperty("Content-Type", "multipart/form-data; boundary="+ BOUNDARY); // 請求本文資訊 // 第一部分: StringBuilder sb = new StringBuilder(); sb.append("--"); // 必須多兩道線 sb.append(BOUNDARY); sb.append("\r\n"); sb.append("Content-Disposition: form-data;name=\"media\";filename=\""+ file.getName() + "\"\r\n"); sb.append("Content-Type:application/octet-stream\r\n\r\n"); byte[] head = sb.toString().getBytes("utf-8"); // 獲得輸出資料流 OutputStream out = new DataOutputStream(con.getOutputStream()); // 輸出表頭 out.write(head); // 檔案本文部分 // 把檔案已流檔案的方式 推入到url中 DataInputStream in = new DataInputStream(new FileInputStream(file)); int bytes = 0; byte[] bufferOut = new byte[1024]; while ((bytes = in.read(bufferOut)) != -1) { out.write(bufferOut, 0, bytes); } in.close(); // 結尾部分 byte[] foot = ("\r\n--" + BOUNDARY + "--\r\n").getBytes("utf-8");// 定義最後資料分隔線 out.write(foot); out.flush(); out.close(); StringBuffer buffer = new StringBuffer(); BufferedReader reader = null; try { // 定義BufferedReader輸入資料流來讀取URL的響應 reader = new BufferedReader(new InputStreamReader(con.getInputStream())); String line = null; while ((line = reader.readLine()) != null) { //System.out.println(line); buffer.append(line); } if(result==null){ result = buffer.toString(); } } catch (IOException e) { System.out.println("發送POST請求出現異常!" + e); e.printStackTrace(); throw new IOException("資料讀取異常"); } finally { if(reader!=null){ reader.close(); } } JSONObject jsonObj =JSONObject.fromObject(result); return jsonObj; }
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java後台訪問url串連——HttpClients