关于post请求内容无法重复获取的解决方法

public ServletInputStream getInputStream() throws IOException {

    if (usingReader) {
        throw new IllegalStateException(sm.getString("coyoteRequest.getInputStream.ise"));
    }

    usingInputStream = true;
    if (inputStream == null) {
        inputStream = new CoyoteInputStream(inputBuffer);
    }
    return inputStream;

}

public int read(byte[] b, int off, int len) throws IOException {
  // 如果流关闭，则抛出异常
    if (closed) {
        throw new IOException(sm.getString("inputBuffer.streamClosed"));
    }
// 如果已经读完了，则返回-1
    if (checkByteBufferEof()) {
        return -1;
    }
    int n = Math.min(len, bb.remaining());
    bb.get(b, off, n);
    return n;
}

public class BodyReaderHttpServletRequestWrapper extends HttpServletRequestWrapper {
		// 存储请求体
    private byte[] body;

    private HttpServletRequest orgRequest;

    public BodyReaderHttpServletRequestWrapper(HttpServletRequest request) throws IOException {
        super(request);
        this.orgRequest = request;
        body = HttpHelper.getBody(request);
    }

    public HttpServletRequest getOrgRequest() {
        return this.orgRequest;
    }

  // 重写读取，从存储的字节数组中读
    @Override
    public BufferedReader getReader() throws IOException {
        return new BufferedReader(new InputStreamReader(getInputStream()));
    }

  // 重写读取，从存储的字节数组中读
    @Override
    public ServletInputStream getInputStream() throws IOException {

        final ByteArrayInputStream bais = new ByteArrayInputStream(body);

        return new ServletInputStream() {

            @Override
            public int read() throws IOException {
                return bais.read();
            }

            @Override
            public boolean isFinished() {
                return false;
            }

            @Override
            public boolean isReady() {
                return false;
            }

            @Override
            public void setReadListener(ReadListener readListener) {

            }
        };
    }
}