我有一个名为FindMeARestaurantDAO的类，其中包含一些方法，这些方法将通过Activity中的AsyncTask个内部类对服务器进行网络调用。我的POST request Method出现问题，如下所示：
@Override
public String findMeARestaurant(List<CheckboxDTO> filters) {
String inputLine;
String errors;
String result;
try
{
// For each CheckboxDTO, get the Id and add it to JSONArray
JSONArray checkboxJSONArray = new JSONArray();
for (CheckboxDTO checkbox : filters)
{
try
{
// Create JSONObject
JSONObject object = new JSONObject();
// Build the object
object.put("id", checkbox.getId());
// Add object to JSONArray
checkboxJSONArray.put(object);
}
catch (Exception e)
{
e.printStackTrace();
}
}
// Put JSONArray into wrapping JSONObject
JSONObject serverObject = new JSONObject();
try
{
// Create wrapping JSONObject
serverObject.put("filtersIds", checkboxJSONArray);
}
catch (Exception e)
{
e.printStackTrace();
}
// Create URL object to hold URL
URL findMeARestaurantURL = new URL(findMeARestaurantsURL);
// Create connection to server
HttpURLConnection connection = (HttpURLConnection) findMeARestaurantURL.openConnection();
// Set request method and timeouts
connection.setRequestMethod(FIND_RESTAURANT_REQUEST_METHOD);
connection.setRequestProperty("Content-Type", "application/json; utf-8");
connection.setRequestProperty("Accept", "application/json");
connection.setChunkedStreamingMode(0);
connection.setDoOutput(true);
connection.setReadTimeout(READ_TIMEOUT);
connection.setConnectTimeout(CONNECTION_TIMEOUT);
// Connect to server
connection.connect();
// Create Writer
Writer writer = new BufferedWriter(new OutputStreamWriter(connection.getOutputStream()));
writer.write(String.valueOf(serverObject));
// Close Writer
writer.close();
// Create InputStreamReader to read response from server
InputStreamReader streamReader = new InputStreamReader(connection.getInputStream(), "utf-8");
// Create BufferedReader to read through InputStream
BufferedReader reader = new BufferedReader(streamReader);
// Create StringBuilder to hold our result
StringBuilder stringBuilder = new StringBuilder();
// Check if the line read is null
while ((inputLine = reader.readLine()) != null){
stringBuilder.append(inputLine);
}
// Close out InputStream and BufferedReader
reader.close();
streamReader.close();
// Set result to stringBuilder
result = stringBuilder.toString();
connection.disconnect();
}
catch (IOException e)
{
e.printStackTrace();
return null;
}
return result;
}
该方法为POST，当我运行我的应用程序时，它似乎将JSON serverObject发送到服务器，但是在InputStreamReader上失败，并返回了FileNotFoundException。该服务器是由合作伙伴为此项目设置的，并表示API的这一部分应该可以正常工作。我是否缺少POST请求的内容？我需要做一些不同的事情来读取服务器的响应吗？任何帮助将不胜感激。
答案 0 :(得分：0)
此问题的解决方案是我如何通过POST请求将数据发送到服务器。建立连接之前，我必须通过将过滤器的ID添加到我的URL来将其发送到服务器。我修改后的方法遍历每个CheckboxDTO并捕获ID，然后将其添加到数组中，然后将其添加到URL：
@Override
public String findMeARestaurant(List<CheckboxDTO> filters) {
String inputLine;
String result;
try
{
// For each CheckboxDTO, get the Id and add it to String Array
int checkboxArray[] = new int[filters.size()];
int i = 0;
for (CheckboxDTO checkbox : filters)
{
try
{
int id = checkbox.getId();
checkboxArray[i] = id;
i++;
}
catch (Exception e)
{
e.printStackTrace();
}
}
// Add filters to end of URL for POST Request
findMeARestaurantsURL += "?filterIds=";
for (i = 0; i < checkboxArray.length; i++)
{
if (i+1 != checkboxArray.length)
{
findMeARestaurantsURL += checkboxArray[i] + ",";
}
else
{
findMeARestaurantsURL += checkboxArray[i];
}
}
// Create URL object to hold URL
URL findMeARestaurantURL = new URL(findMeARestaurantsURL);
// Create connection to server
HttpURLConnection connection = (HttpURLConnection) findMeARestaurantURL.openConnection();
// Set request method and timeouts
connection.setRequestMethod(FIND_RESTAURANT_REQUEST_METHOD);
connection.setRequestProperty("Content-Type", "application/json; utf-8");
connection.setRequestProperty("Accept", "application/json");
connection.setChunkedStreamingMode(0);
connection.setDoOutput(true);
connection.setReadTimeout(READ_TIMEOUT);
connection.setConnectTimeout(CONNECTION_TIMEOUT);
// Connect to server
connection.connect();
// Create InputStreamReader to read response from server
InputStreamReader streamReader = new InputStreamReader(connection.getInputStream(), "utf-8");
// Create BufferedReader to read through InputStream
BufferedReader reader = new BufferedReader(streamReader);
// Create StringBuilder to hold our result
StringBuilder stringBuilder = new StringBuilder();
// Check if the line read is null
while ((inputLine = reader.readLine()) != null){
stringBuilder.append(inputLine);
}
// Close out InputStream and BufferedReader
reader.close();
streamReader.close();
// Set result to stringBuilder
result = stringBuilder.toString();
connection.disconnect();
}
catch (IOException e)
{
e.printStackTrace();
return null;
}
return result;
}
该服务器使用Spring框架，并且据我的合伙人称，该服务器未使用JSONObject。