需要这段代码的帮助。“post”方法很有效。但当我为另一个接受get方法的api将其改为“get”时，它遇到了405错误。
p/s：我已经使用postman测试了api，并设法得到了正确的响应。

try {
        URL url = new URL(FullURL);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();          
        conn.setDoOutput(true);
        conn.setRequestMethod("GET");
        conn.setReadTimeout(9000);
        String input = "{\"accNo\": \"" + accNo + "\",\"token\": \"" + aToken +"\"}";   

        OutputStream os = conn.getOutputStream();
        os.write(input.getBytes());
        os.flush();

        Integer HTTPResponse = conn.getResponseCode();
        if(HTTPResponse != 200) 
        {
            //System.out.println("HTTP Response Code: " + conn.getResponseCode());
        }

        BufferedReader reader = new BufferedReader(new InputStreamReader((conn.getInputStream())));

        StringBuilder buf = new StringBuilder();
        char[] cbuf = new char[ 2048 ];
        int num;

        while ( -1 != (num=reader.read(cbuf)))
        {
            buf.append( cbuf, 0, num );
        }

        output = buf.toString();
        conn.disconnect();
        reader.close();
      }