HttpServletResponseWrapper获取response内容的问题

[ForeverLonely00]

自己写了个filter来获取webservice访问后response的内容，使用了HttpServletResponseWrapper，发现webservice无法获取返回的结果，主要部分如下。求教~

public class GetHttpServletResponseWrapper extends HttpServletResponseWrapper {

    private ByteArrayOutputStream buffer = null;
    private ServletOutputStream out = null;
    private PrintWriter writer = null;

    public GetHttpServletResponseWrapper(HttpServletResponse resp) throws IOException {
        super(resp);
        buffer = new ByteArrayOutputStream();// 真正存储数据的流
        out = new WapperedOutputStream(buffer);
        writer = new PrintWriter(new OutputStreamWriter(buffer, this.getCharacterEncoding()));
    }

    /**重载父类获取outputstream的方法*/
    @Override
    public ServletOutputStream getOutputStream() throws IOException {
        return out;
    }

    /**重载父类获取writer的方法*/
    @Override
    public PrintWriter getWriter() throws UnsupportedEncodingException {
        return writer;
    }

    /**重载父类获取flushBuffer的方法*/
    @Override
    public void flushBuffer() throws IOException {
        if (out != null) {
            out.flush();
        }
        if (writer != null) {
            writer.flush();
        }
    }

    @Override
    public void reset() {
        buffer.reset();
    }

    /**将out、writer中的数据强制输出到WapperedResponse的buffer里面，否则取不到数据*/
    public byte[] getResponseData() throws IOException {
        flushBuffer();
        return buffer.toByteArray();
    }

    /**内部类，对ServletOutputStream进行包装*/
    private class WapperedOutputStream extends ServletOutputStream {
        private ByteArrayOutputStream bos = null;

        public WapperedOutputStream(ByteArrayOutputStream stream) throws IOException {
            bos = stream;
        }

        @Override
        public void write(int b) throws IOException {
            bos.write(b);
        }
        @Override
        public void write(byte[] b) throws IOException {
            bos.write(b, 0, b.length);
        }
    }
}

public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) {

        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        GetHttpServletRequestWrapper requestWrapper = null;
        GetHttpServletResponseWrapper responseWrapper = null;
        try {
            requestWrapper = new GetHttpServletRequestWrapper(request);
            responseWrapper = new GetHttpServletResponseWrapper(response);
              filterChain.doFilter(requestWrapper, responseWrapper);
            String requestContent = requestWrapper.getRequestContent();

        } catch (IOException ioe) {
            ioe.printStackTrace();
        } catch (ServletException se) {
            se.printStackTrace();
        }
    }

requestContent 能获取到值，但是webservice接口会获取不到