拦截器获取request的值之后,Controller拿不到值的解决

public class MyHttpServletRequestWrapper extends HttpServletRequestWrapper { 
    private final byte[] buff; 
    public MyHttpServletRequestWrapper(HttpServletRequest request) throws IOException {
        super(request);
        InputStream is = request.getInputStream();
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        byte[] b = new byte[1024];
        int len;
        while ((len = is.read(b)) != -1) {
            baos.write(b, 0, len);
        }
        buff = baos.toByteArray();
    }
 
    @Override
    public ServletInputStream getInputStream() throws IOException {
        final ByteArrayInputStream bais = new ByteArrayInputStream(buff);
        return new ServletInputStream() {
            @Override
            public int read() throws IOException {
                return bais.read();
            }
        };
    }
 
    @Override
    public BufferedReader getReader() throws IOException {
        return new BufferedReader(new InputStreamReader(getInputStream()));
    }
}
 

public class MyRequestBodyFilter implements Filter { 
    @Override
    public void init(FilterConfig filterConfig) throws ServletException { 
    }
 
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest httpServletRequest = (HttpServletRequest) servletRequest;
        servletRequest = new MyHttpServletRequestWrapper(httpServletRequest);
        filterChain.doFilter(servletRequest, servletResponse);
    }
 
    @Override
    public void destroy() { 
    }
}

public class RequestUtils { 
    public static String getRequestValue(HttpServletRequest request) throws IOException {
        StringBuffer sb = new StringBuffer();
        MyHttpServletRequestWrapper myHttpServletRequestWrapper = new MyHttpServletRequestWrapper(request);
        InputStream is = myHttpServletRequestWrapper.getInputStream();
        BufferedReader br = new BufferedReader(new InputStreamReader(is));
        String str;
        while ((str = br.readLine()) != null) {
            sb.append(str);
        }
        return sb.toString();
    } 
}

@Retention(RUNTIME)
@Target(METHOD)
public @interface MyOperation {
    String value() default "";//默认为空，因为名字是value，实际操作中可以不写"value="
}

@Controller("testController")
public class TestController {
    @MyOperation("用户修改")//主要看这里
    @RequestMapping("test")
    @ResponseBody
    public String test(String id) {
        return "Hello,2018!"+id;
    }
}

@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
        throws Exception {
    System.out.println("进入拦截器");
    if(handler instanceof HandlerMethod) {
        HandlerMethod h = (HandlerMethod)handler;
        System.out.println("用户想执行的操作是:"+h.getMethodAnnotation(MyOperation.class).value());
        //判断后执行操作...
    }
    return HandlerInterceptor.super.preHandle(request, response, handler);
}

@Retention(RUNTIME)
@Target(TYPE)
public @interface MyOperation {
    String value() default "";
}
//拦截器中这样获得
h.getMethod().getDeclaringClass().getAnnotation(MyOperation.class);