zuul修改请求参数

zuul的过滤器filter的run方法里面写如下

InputStream in = null;
try {
    in = ctx.getRequest().getInputStream();
    String body = StreamUtils.copyToString(in, Charset.forName("UTF-8"));
    JSONObject json = JSONObject.parseObject(body);
    json.put("id", id);
    String newBody = json.toString();
    final byte[] reqBodyBytes = newBody.getBytes();
    ctx.setRequest(new HttpServletRequestWrapper(request){
        @Override
        public ServletInputStream getInputStream() throws IOException {
            return new ServletInputStreamWrapper(reqBodyBytes);
        }
        @Override
        public int getContentLength() {
            return reqBodyBytes.length;
        }
        @Override
        public long getContentLengthLong() {
            return reqBodyBytes.length;
        }
    });
} catch (IOException e) {
    e.printStackTrace();
}