UTF-8 code (garbled) problem solving method for Android post data _android

A bug was encountered today: a piece of data that was posted to the server by the client caused an unknown exception on the server side. The server side confirmation is a coded conversion error. This intercepts the network packet for analysis and discovers that the JSON data in the client post contains the following paragraph (hex form):

Copy Code code as follows:

... B7 20 52 69 63 ...

The problem is on this b7. Looking at the Unicode code table, U+00B7 is Middle DOT and its UTF-8 representation should be C2 B7, but why does it become B7 in the data sent by the client?

Because the system used Ormlite, Gson and async-http several libraries, so the investigation. Finally found that the original is to send data to the server did not specify the text encoding, causing async-http (the actual Apache common HTTP client) to send the data in iso-8559-1 format, U+00B7 is encoded into B7, The server then attempted to use UTF-8 to decode with an error.

The code snippet for the error is as follows:

Copy Code code as follows:

Gson Gson = new Gson ();
String JSON = Gson.tojson (data);
stringentity entity = new stringentity (JSON);
Httpclient.post (context, URL, entity, "Application/json", New Texthttpresponsehandler () ...);

The third line, New Stringentity (JSON), did not specify an encoding to cause an error. The following corrections are followed:

Copy Code code as follows:

Gson Gson = new Gson ();
String JSON = Gson.tojson (data);
stringentity entity = new Stringentity (JSON, "utf-8");
Httpclient.post (context, URL, entity, "Application/json;charset=utf-8", New Texthttpresponsehandler () ...);