我有一个android设备，它创建一个json格式的消息并将其发送到tomcat服务器。服务器正在运行一个java web应用程序，它接收这个json格式的消息，然后处理它。
我的问题是，当服务器接收到消息时，服务器将某些字符（'{'、'['、''、']、']'和'}'）替换为其十六进制表示形式，这将导致服务器无法识别消息的JSON错误。
我的问题是，是否有人知道是什么引起了这个问题，以及我将如何着手解决这个问题（我确信这不是JSON代码，而是按照发送/接收的方式来处理消息）。
这是我的服务器端代码：
@Override
protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// Setup response
PrintWriter out = response.getWriter();
// Store input message as String
StringBuilder sb = new StringBuilder();
String message;
// Build String
while ((message = request.getReader().readLine()) != null) {
sb.append(message);
}
// Full message as String
message = sb.toString();
// Convert message to JSON format
Gson gson = new Gson();
ImageFeatures features = gson.fromJson(message, ImageFeatures.class);
out.println("Normal data: " + features);
out.println();
}
以下是我收到的错误：
com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 1 column 12
com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:176)
com.google.gson.Gson.fromJson(Gson.java:795)
com.google.gson.Gson.fromJson(Gson.java:761)
com.google.gson.Gson.fromJson(Gson.java:710)
com.google.gson.Gson.fromJson(Gson.java:682)
这是在android设备将消息发送到服务器之前生成的json格式的消息：
{
"image_x_size":800,
"image_y_size":1600,
"features":
[
{"cart_x":5.0,"cart_y":124.0,"polar_angle":0.0,"polar_dist":0.0,"size":15.0},
{"cart_x":5.0,"cart_y":124.0,"polar_angle":0.0,"polar_dist":0.0,"size":15.0}
]
}
这是服务器看到消息的方式（即
message字符串的内容）：%7B+%09%22image_x_size%22%3A800%2C+%09%22image_y_size%22%3A1600%2C+%09%22features%22%3A+%09%09%5B+%09%09%09%7B%22cart_x%22%3A5.0%2C%22cart_y%22%3A124.0%2C%22polar_angle%22%3A0.0%2C%22polar_dist%22%3A0.0%2C%22size%22%3A15.0%7D%2C+%09%09%09%7B%22cart_x%22%3A5.0%2C%22cart_y%22%3A124.0%2C%22polar_angle%22%3A0.0%2C%22polar_dist%22%3A0.0%2C%22size%22%3A15.0%7D+%09%09%5D+%7D+
如您所见，消息字符串有各种十六进制值来替换某些字符。
多谢提前！
编辑：我想我应该包括我的android代码以进一步澄清
HttpClient http_client = new DefaultHttpClient();
// Set long timeout limit
HttpConnectionParams.setConnectionTimeout(http_client.getParams(), 10000);
HttpConnectionParams.setSoTimeout(http_client.getParams(), 10000);
HttpResponse response;
// Setup json_object
JSONObject json_object = convertImageFeaturesToJSON(data, x, y);
try {
HttpPost http_post = new HttpPost(URL_BASE + "/featureuploader");
Log.i(TAG, json_object.toString());
StringEntity se = new StringEntity(json_object.toString());
se.setContentType("application/json; charset=UTF-8");
se.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, "application/json; charset=UTF-8"));
http_post.setEntity(se);
http_post.setHeader("Accept", "application/json");
http_post.setHeader("Content-Type", "application/json");
response = http_client.execute(http_post);
if (response != null) {
String response_string = httpResponseToString(response.getEntity().getContent());
if (! response_string.startsWith("Received: <html>")) {
Log.i(TAG, "Received: ERROR! - " + response_string.substring(0, 20));
} else {
Log.i(TAG, "Received: " + response_string);
}
} else {
Log.e(TAG, "Did not receive from server");
}
} catch (Exception e) {
Log.e(TAG, "Error: " + e.getMessage());
}
最佳答案
这就是服务器看到消息的方式…
这是服务器上看到的json的url编码版本。您需要先解码它（使用类似于URLDecoder的东西），或者以解码后的方式从请求中检索它。