在使用Volley库时,我注意到当进行POST JsonObjectRequest
请求时,如果服务器返回304或者200状态码,但响应结果中没有数据(response.data)
,Volley会将其解释为错误响应而不是成功。
我通过在JsonObjectRequest.java
中的方法Response<JSONObject> parseNetworkResponse(NetworkResponse response)
加入了几行代码来解决这个问题。
@Override
protected Response<JSONObject> parseNetworkResponse(NetworkResponse response) {
try {
if (!response.notModified) {// Added for 304 response
String jsonString = new String(response.data,
HttpHeaderParser.parseCharset(response.headers));
return Response.success(new JSONObject(jsonString),
HttpHeaderParser.parseCacheHeaders(response));
} else // Added for 304 response
return Response.success(new JSONObject(),HttpHeaderParser.parseCacheHeaders(response));
} catch (UnsupportedEncodingException e) {
Log.v("Volley", "UnsupportedEncodingException " + response.statusCode);
if (response.statusCode == 200)// Added for 200 response
return Response.success(new JSONObject(), HttpHeaderParser.parseCacheHeaders(response));
else
return Response.error(new ParseError(e));
} catch (JSONException je) {
Log.v("Volley", "JSONException " + response.statusCode);
if (response.statusCode == 200)// Added for 200 response
return Response.success(new JSONObject(),HttpHeaderParser.parseCacheHeaders(response));
else
return Response.error(new ParseError(je));
}
}
这是解决问题的最佳方案吗?
谢谢!
编辑
检查BasicNetwork.java
类,我发现Volley通过询问httpResponse.getEntity() != null
来检查响应是否没有数据。
// Some responses such as 204s do not have content. We must check.
if (httpResponse.getEntity() != null) {
responseContents = entityToBytes(httpResponse.getEntity());
} else {// Add 0 byte response as a way of honestly representing a
// no-content request.
responseContents = new byte[0];
}
但问题仍然是在Volley尝试使用response.data == new byte[0]
创建新字符串时出现的JSONException,此处需要在parseNetworkResponse方法中处理。