reader.readLine() 出现Stream is closed 问题

SpringBoot的使用HandlerInterceptor 通过request.getInputStream()获取数据报Stream closed异常分析解决。

一、代码

拦截器：

@Component
public class AmsInterceptor implements HandlerInterceptor {

    private static final Logger LOGGER = LoggerFactory.getLogger(AmsInterceptor.class);

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        HandlerMethod method = (HandlerMethod) handler;
        String cn = method.getBean().getClass().getName();
        String mn = method.getMethod().getName();
        String bodyString = getBodyString(request);
        LOGGER.info("preHandle : [{}]#[{}]#[{}]", cn, mn, bodyString);
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        LOGGER.info("postHandle : [{}]", request.getRequestURI());
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        LOGGER.info("afterCompletion : [{}]", request.getRequestURI());
    }

}
public static String getBodyString(HttpServletRequest request) throws IOException {
    StringBuilder sb = new StringBuilder();
    InputStream inputStream = null;
    BufferedReader reader = null;
    try {
        inputStream = request.getInputStream();
        reader = new BufferedReader(new InputStreamReader(inputStream, Charset.forName("UTF-8")));
        String line = "";
        while ((line = reader.readLine()) != null) {
            sb.append(line);
        }
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        if (inputStream != null) {
            try {
                inputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        if (reader != null) {
            try {
                reader.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    return sb.toString();
}

方法：

/**
 * 获取 Body 参数
 *
 * @param request
 * @return
 * @throws IOException
 */public static Map<String, Object> getAllRequestParam(final HttpServletRequest request) throws IOException {
 BufferedReader reader = new BufferedReader(new InputStreamReader(request.getInputStream()));
 String str = "";
 StringBuilder wholeStr = new StringBuilder();

//一行一行的读取body体里面的内容；
 while ((str = reader.readLine()) != null) {
 wholeStr.append(str);
 }
 //转化成json对象
 return JSONObject.parseObject(wholeStr.toString(), Feature.OrderedField);
}

String bodyString = getBodyString(request); 我们在拦截器中通过request.getInputStream();获取到body中的信息后，之后在controller中使用了@RequestBody注解获取参数报如下错误：

java.io.IOException: UT010029: Stream is closed

Controller方法：

@RequestMapping(value = {"/getOnlineService"}, method = {RequestMethod.POST}, produces = "application/json;charset=UTF-8")
public ApiReply getOnlineServiceByBusinessId(@Validated @RequestBody BusinessCateQuery query) {
 logger.info("getOnlineServiceByBusinessId method param {}", query.toString());
 ApiReply resp = new ApiReply();
 try {
 List<CustServiceRep> serviceList = businessClassService.getOnlineServiceByBusinessId(query.getBusinessId(), query.getOrganId());
 resp.setModel(serviceList);
 resp.setMessage("success");
 } catch(Exception e) {
 logger.error("根据业务分类获取在线客服接口错误:_" + e.getMessage(), e);
 return new ApiReply(ApiReplyCode.FAILED);
 }
 return resp;
}

二、出现原因

spring boot项目，RequestBody里数据，只能通过流的方式获取，而在aop里获取了，在Controller里使用@RequestBody注解再获取就报

I/O error  while reading input message; nested exception is java.io.IOException: Stream closed

这个流只能用一次，用过之后，就不能再取数据了。

因为我们在AOP里边有获取body的调用，所以，再controller中使用@RequestBody时就报错了。

三、解决方案

先读取流，然后在将流写进去，下次就可以再读取流了。

实现

1. 重写 HttpServletRequestWrapper

public class ReHttpServletRequestWrapper extends HttpServletRequestWrapper {

    private final byte[] bodyBuf;

    public ReHttpServletRequestWrapper(HttpServletRequest request) throws IOException {
        super(request);
        bodyBuf = HttpHelper.getBodyString(request).getBytes(Charset.forName("UTF-8"));
    }

    @Override
    public ServletInputStream getInputStream() throws IOException {

        final ByteArrayInputStream stream = new ByteArrayInputStream(bodyBuf);

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

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

            @Override
            public void setReadListener(ReadListener readListener) {

            }

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

    @Override
    public BufferedReader getReader() throws IOException {
        return new BufferedReader(new InputStreamReader(getInputStream()));
    }
}

2. 将重写 HttpServletRequestWrapper通过过滤器重新写入

@Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;

        String uri = request.getRequestURI();

        long start = System.currentTimeMillis();
        LOGGER.info("请求地址 : [{}]", uri);

        ServletRequest requestWrapper;
        if (servletRequest instanceof HttpServletRequest) {
            requestWrapper = new ReHttpServletRequestWrapper((HttpServletRequest) servletRequest);
            if (requestWrapper != null) {
                servletRequest = requestWrapper;
            }
        }

        filterChain.doFilter(servletRequest, servletResponse);

        long end = System.currentTimeMillis();

        LOGGER.info("请求地址 : [{}], 耗时 : [{}] ms", uri, (end - start));
    }

这样我们就可以在Interceptor中通过request.getInputStream();获取到body中的信息。

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