springboot中filter获取了body，导致controller无法获取body，如何解决

在Spring Boot中，HTTP请求的Body只能被读取一次，因此如果Filter已经读取了Body，那么Controller就无法再次读取Body了。为了解决这个问题，可以使用HttpServletRequestWrapper来包装HttpServletRequest，从而在Filter中读取Body后，仍然可以将HttpServletRequest传递给Controller。

以下是一个示例代码：

public class BodyReaderHttpServletRequestWrapper extends HttpServletRequestWrapper {
    private final byte[] body;

    public BodyReaderHttpServletRequestWrapper(HttpServletRequest request) throws IOException {
        super(request);
        body = IOUtils.toByteArray(request.getInputStream());
    }

    @Override
    public ServletInputStream getInputStream() throws IOException {
        return new ServletInputStreamWrapper(body);
    }

    @Override
    public BufferedReader getReader() throws IOException {
        ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(body);
        return new BufferedReader(new InputStreamReader(byteArrayInputStream));
    }
}

然后，在Filter中使用BodyReaderHttpServletRequestWrapper来包装HttpServletRequest：

public class BodyReaderFilter implements Filter {

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
        BodyReaderHttpServletRequestWrapper requestWrapper = new BodyReaderHttpServletRequestWrapper(httpServletRequest);
        chain.doFilter(requestWrapper, response);
    }
}

这样，在Controller中就可以正常获取到请求的Body了。