Java UTF-8编码不起作用HttpURLConnection

请尝试以下代码：

DataOutputStream wr = new DataOutputStream(conn.getOutputStream());BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(wr, "UTF-8"));writer.write(content);writer.close();wr.close();

您应该使用JSONObject传递参数

输入，请尝试

BufferedReader reader = new BufferedReader(new InputStreamReader(resultContentIS, "UTF-8"));

如果输出是：???????，那么不用担心，因为您的输出控制台不支持UTF-8