SpringBoot拦截器执行后，Controller层不执行

努力的雅木茶

已于 2024-11-06 21:36:39 修改

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文章标签： java spring

于 2020-09-27 11:43:23 首次发布

本文链接：https://blog.youkuaiyun.com/weixin_45819367/article/details/108824686

版权

本文介绍了解决SpringBoot项目中因拦截器导致Controller层接收不到参数的问题。通过自定义RequestWrapper类重写getInputStream及getReader方法，实现了一次读取请求体多次使用的需求。

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问题描述：

请求在SpringBoot拦截器中执行后，在Controller层不执行，前端错误码400

原因分析：

ServletRequest 中通过流获取参数（getInputStream()）只能读取一次，而@RequestBody注解也是根据流的形式获取参数。所以拦截器中 request 使用流获取参数后，Controller中获取不到参数

解决方案：

// 拦截器中获取请求
RequestWrapper myRequestWrapper = new RequestWrapper(request);
String JSONData = myRequestWrapper.getBody();

public class RequestWrapper extends HttpServletRequestWrapper {

    /**
     * 存储请求数据
     */
    private String body;

    public RequestWrapper(HttpServletRequest request) {
        super(request);
        renewBody(request);
    }

    /**
     * 重写getInputStream方法
     * @return
     */
    @Override
    public ServletInputStream getInputStream() {
        final ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(body.getBytes());
        ServletInputStream servletInputStream = new ServletInputStream() {
            @Override
            public boolean isFinished() {
                return false;
            }

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

            @Override
            public void setReadListener(ReadListener readListener) {
            }

            @Override
            public int read() {
                return byteArrayInputStream.read();
            }
        };
        return servletInputStream;

    }

    /**
     * 重写getReader方法
     * @return
     */
    @Override
    public BufferedReader getReader() {
        return new BufferedReader(new InputStreamReader(this.getInputStream()));
    }

    /**
     * 读取body的值
     * @param request
     */
    private void renewBody(HttpServletRequest request) {
        StringBuilder stringBuilder = new StringBuilder();
        BufferedReader bufferedReader = null;
        try {
            InputStream inputStream = request.getInputStream();
            if (inputStream != null) {
                bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
                char[] charBuffer = new char[128];
                int bytesRead = -1;
                while ((bytesRead = bufferedReader.read(charBuffer)) > 0) {
                    stringBuilder.append(charBuffer, 0, bytesRead);
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (bufferedReader != null) {
                try {
                    bufferedReader.close();
                } catch (IOException ex) {
                    ex.printStackTrace();
                }
            }
        }
        body = stringBuilder.toString();
    }

    public String getBody() {
        return body;
    }

}

@Component
public class HttpServletFilter implements Filter {


    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        ServletRequest requestWrapper = null;
        if (servletRequest instanceof HttpServletRequest) {
            requestWrapper = new RequestWrapper((HttpServletRequest) servletRequest);
            System.out.println(((RequestWrapper) requestWrapper).getBody());
            // do something
        }
        if (requestWrapper == null) {
            filterChain.doFilter(servletRequest, servletResponse);
        } else {
            filterChain.doFilter(requestWrapper, servletResponse);
        }

    }

    @Override
    public void destroy() {

    }
}