java后台访问url,并传递数据——通过httpclient方式
需要的包,包可能多几个额外的,如果无用或者冲突删除即可,httpclient是使用的是4.4.1的版本:http://download.csdn.net/detail/myfmyfmyfmyf/8894191
1、无参数传递,以微信开发为例,后台访问url连接获得全部的人员列表
/** * 获取全部人员列表 * @return */ public JSONObject getAllEmployee(){ //获取微信号 String token=getTokenFromWx(); String dep_root=ROOT_DEP;//跟部门树 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>() { //成功调用连接后,对返回数据进行的操作 public JSONObject handleResponse( final HttpResponse response) throws ClientProtocolException, IOException { int status = response.getStatusLine().getStatusCode(); if (status >= 200 && status < 300) { //获得调用成功后 返回的数据 HttpEntity entity = response.getEntity(); if(null!=entity){ String result= EntityUtils.toString(entity); //根据字符串生成JSON对象 JSONObject resultObj = JSONObject.fromObject(result); return resultObj; }else{ return null; } } else { throw new ClientProtocolException("Unexpected response status: " + status); } } }; //返回的json对象 JSONObject responseBody = httpclient.execute(httpPost, responseHandler); //System.out.println(responseBody); return responseBody; }catch (Exception e) { e.printStackTrace(); return null; } }
2、有参数传递,以微信开发为例,后台访问url主动发送消息(json数据),httpClient通过设置StringEntity对象传递
/** * 主动发送消息 * @param mess * @return */ public boolean sendReqMsg(ReqBaseMessage mess){ //消息json格式 String jsonContext=mess.toJsonStr(); //System.out.println(jsonContext); //获得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); //发送json格式的数据 StringEntity myEntity = new StringEntity(jsonContext, ContentType.create("text/plain", "UTF-8")); //设置需要传递的数据 httpPost.setEntity(myEntity); // Create a custom response handler ResponseHandler<JSONObject> responseHandler = new ResponseHandler<JSONObject>() { //对访问结果进行处理 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); //根据字符串生成JSON对象 JSONObject resultObj = JSONObject.fromObject(result); return resultObj; }else{ return null; } } else { throw new ClientProtocolException("Unexpected response status: " + status); } } }; //返回的json对象 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 block e.printStackTrace(); } return flag; }
3、传递图片、文件等媒体信息,还是以微信开发为例
/** * 文件上传到微信服务器 * @param fileType 文件类型 媒体文件类型,分别有图片(image)、语音(voice)、视频(video),普通文件(file) * @param filePath 文件路径 * @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("文件不存在"); } 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方式提交表单,默认get方式 con.setDoInput(true); con.setDoOutput(true); con.setUseCaches(false); // post方式不能使用缓存 // 设置请求头信息 con.setRequestProperty("Connection", "Keep-Alive"); con.setRequestProperty("Charset", "UTF-8"); // 设置边界 String BOUNDARY = "----------" + System.currentTimeMillis(); con.setRequestProperty("Content-Type", "multipart/form-data; boundary="+ BOUNDARY); // 请求正文信息 // 第一部分: StringBuilder sb = new StringBuilder(); sb.append("--"); // 必须多两道线 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"); // 获得输出流 OutputStream out = new DataOutputStream(con.getOutputStream()); // 输出表头 out.write(head); // 文件正文部分 // 把文件已流文件的方式 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(); // 结尾部分 byte[] foot = ("\r\n--" + BOUNDARY + "--\r\n").getBytes("utf-8");// 定义最后数据分隔线 out.write(foot); out.flush(); out.close(); StringBuffer buffer = new StringBuffer(); BufferedReader reader = null; try { // 定义BufferedReader输入流来读取URL的响应 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("发送POST请求出现异常!" + e); e.printStackTrace(); throw new IOException("数据读取异常"); } finally { if(reader!=null){ reader.close(); } } JSONObject jsonObj =JSONObject.fromObject(result); return jsonObj; }
版权声明:本文为博主原创文章,未经博主允许不得转载。
时间: 2024-11-07 02:43:34