发布网络服务在 Android 中不起作用

Question

我是 Android 和网络服务的新手。我从未使用过邮政网络服务。尝试如下，但它既没有显示成功也没有失败。

如果我使用高级的 rest 客户端 chrome 扩展，我可以测试并且 web 服务运行良好，只是需要很长时间。

当尝试从代码运行时，它立即显示 - 在调用 webservices 之后 - toast msg --> 表示它没有调用 webservice。

花了 2 天时间，但没有运气。有什么建议么？

 public void borrowBook(String barCode, String patronId)
    {
        final int DEFAULT_TIMEOUT = 200000 * 1000000000;

        // Make RESTful webservice call using AsyncHttpClient object
        AsyncHttpClient client = new AsyncHttpClient();
        client.setTimeout(DEFAULT_TIMEOUT);

        progress.setMessage("Please Wait...");
        progress.setIndeterminate(false);
        progress.setCancelable(false);
        progress.show();

        RequestParams params = new RequestParams();

        Toast.makeText(getActivity().getApplicationContext(), "B4 calling webservice", Toast.LENGTH_LONG).show();

        client.post("http://43.555.6.111:8081/SIPServices/SIc.svc/Checkout?barcode=B12&patron=thi", new TextHttpResponseHandler() {
                    @Override
                    public void onSuccess(int i, Header[] headers, String response) {
                        Toast.makeText(getActivity().getApplicationContext(), "Response: " + response, Toast.LENGTH_LONG).show();
                        Log.d("TAG", "Success");
                    }

                    @Override
                    public void onFailure(int statusCode, Header[] headers, String response, Throwable error) {
                        Toast.makeText(getActivity().getApplicationContext(), "Status code :" + statusCode + "errmsg : " + error.getMessage(), Toast.LENGTH_LONG).show();
                        Toast.makeText(getActivity().getApplicationContext(), "Unexpected Error occcured! [Most common Error: Device might not be connected to Internet or remote server is not up and running]", Toast.LENGTH_LONG).show();
                        Log.d("TAG", "Failure");
                    }

                }
        );
        progress.dismiss();
        Toast.makeText(getActivity().getApplicationContext(), "After calling webservice", Toast.LENGTH_LONG).show();
    }

Answer 1

您没有将参数设置为任何内容，也没有发送它们。 另外，您正在尝试进行 post call，但 url 带有 get 参数：“http://43.555.6.111:8081/SIPServices/SIc.svc/Checkout?barcode=B12&patron=thi”

还可以考虑实现 onStart 方法并记录它，看看它是否启动了。

Answer 2

这是我处理请求的自定义类。我在这里使用 json，你可以返回并输入你想要的。你只需要

• 网址：http://43.555.6.111:8081/SIPServices/SIc.svc/Checkout
• 方法：“POST”

• params: 键值数组列表：barcode=B12&patron=thi

  HashMap<String, String> mValueParams = new HashMap<>();
  mValueParams.put("barcode", "B12");
  mValueParams.put("patron", "thi");
  
  JSONObject json = jsonParser.makeHttpRequest(url, "POST",mValueParams);
  

  public JSONObject makeHttpRequest(String url, String 方法, HashMap 参数）{

      sbParams = new StringBuilder();
      int i = 0;
      for (String key : params.keySet()) {
          try {
              if (i != 0) {
                  sbParams.append("&");
              }
              sbParams.append(key).append("=")
                      .append(URLEncoder.encode(params.get(key), charset));
  
          } catch (UnsupportedEncodingException e) {
              e.printStackTrace();
          }
          i++;
      }
  
      if (method.equals("POST")) {
          // request method is POST
          try {
              urlObj = new URL(url);
  
              conn = (HttpURLConnection) urlObj.openConnection();
  
              conn.setDoOutput(true);
  
              conn.setRequestMethod("POST");
  
              conn.setRequestProperty("Accept-Charset", charset);
  
              conn.setReadTimeout(10000);
              conn.setConnectTimeout(15000);
  
              conn.connect();
  
              paramsString = sbParams.toString();
  
              wr = new DataOutputStream(conn.getOutputStream());
              wr.writeBytes(paramsString);
              wr.flush();
              wr.close();
  
          } catch (IOException e) {
              e.printStackTrace();
          }
      } else if (method.equals("GET")) {
          // request method is GET
  
          if (sbParams.length() != 0) {
              url += "?" + sbParams.toString();
          }
  
          try {
              urlObj = new URL(url);
  
              conn = (HttpURLConnection) urlObj.openConnection();
  
              conn.setDoOutput(false);
  
              conn.setRequestMethod("GET");
  
              conn.setRequestProperty("Accept-Charset", charset);
  
              conn.setConnectTimeout(15000);
  
              conn.connect();
  
          } catch (IOException e) {
              e.printStackTrace();
          }
  
      }
  
      try {
          //Receive the response from the server
          int status = conn.getResponseCode();
          InputStream in = new BufferedInputStream(conn.getInputStream());
          BufferedReader reader = new BufferedReader(new InputStreamReader(in, "iso-8859-1"), 8);
          result = new StringBuilder();
          String line;
          while ((line = reader.readLine()) != null) {
              result.append(line);
          }
  
      } catch (IOException e) {
          e.printStackTrace();
      }
  
      conn.disconnect();
  
      // try parse the string to a JSON object
      try {
          jObj = new JSONObject(result.toString());
      } catch (Exception e) {
          Log.e("JSON Parser", "Error parsing data " + e.toString());
      }
  
      // return JSON Object
      return jObj;
  }