我有以下问题：我在弹簧控制器处理之前尝试获取POST请求的主体。为此我使用HandlerInterceptorAdapter的preHandle（）方法。
如本讨论中所述Spring REST service: retrieving JSON from Request我也使用HttpServletRequestWrapper。使用此包装器，我设法打印第一个POST请求的主体，但第二个POST抛出IOException：StreamClosed。
您对我如何获取所有POST请求的主体有什么想法吗？
这是来自拦截器的preHandle（）方法：
@Override
public boolean preHandle(HttpServletRequest request,
HttpServletResponse response, Object handler) throws Exception {
System.out.println(request.getMethod());
MyRequestWrapper w = new MyRequestWrapper(request);
BufferedReader r = w.getReader();
System.out.println(r.readLine());
return super.preHandle(request, response, handler);
}
HttpServletRequestWrapper：
public class MyRequestWrapper extends HttpServletRequestWrapper {
private ByteArrayOutputStream cachedBytes;
private HttpServletRequest request;
public MyRequestWrapper(HttpServletRequest request) {
super(request);
this.request = request;
}
@Override
public ServletInputStream getInputStream() throws IOException {
cachedBytes = new ByteArrayOutputStream();
if (request.getMethod().equals("POST"))
cacheInputStream();
return new CachedServletInputStream();
}
@Override
public BufferedReader getReader() throws IOException {
return new BufferedReader(new InputStreamReader(getInputStream()));
}
private void cacheInputStream() throws IOException {
/*
* Cache the inputstream in order to read it multiple times. For
* convenience, I use apache.commons IOUtils
*/
ServletInputStream inputStream = super.getInputStream();
if (inputStream == null) {
return;
}
IOUtils.copy(inputStream, cachedBytes);
}
/* An inputstream which reads the cached request body */
public class CachedServletInputStream extends ServletInputStream {
private ByteArrayInputStream input;
public CachedServletInputStream() {
/* create a new input stream from the cached request body */
input = new ByteArrayInputStream(cachedBytes.toByteArray());
}
@Override
public int read() throws IOException {
return input.read();
}
}
}
控制台输出：
2014-10-15 12:13:00 INFO [http-nio-8080-exec-1] org.springframework.web.servlet.DispatcherServlet - FrameworkServlet 'dispatcherServlet': initialization completed in 9 ms
GET
null
GET
null
POST
{"long":null,"owner":{"__type":"Owner","id":20,"version":1,"md5Password":""},"string":"ws","tool":{"__type":"Tool","id":33,"version":1}}
POST
2014-10-15 12:13:00 ERROR [http-nio-8080-exec-3] org.apache.catalina.core.ContainerBase.[Tomcat].[localhost].[/].[dispatcherServlet] - Servlet.service() for servlet dispatcherServlet threw exception
java.io.IOException: Stream closed
答案 0 :(得分：1)
您尝试从Wrapper中的原始请求中读取，但在此之后，原始请求仍在被读取 - 因此请求输入流已被使用且无法再次读取。
不要使用Interceptor，而应考虑使用javax.servlet.Filter。在doFilter方法中，您可以在链上传递包装的请求。
答案 1 :(得分：0)
我使用过滤器来实现Filter＆amp;扩展HandlerInterceptorAdapter的拦截器（因为在过滤器中所有字段都可以为空，我不能将任何内容保存到DB。请参阅Autowired Null Pointer Exception）来检索请求和响应正文并将它们保存到DB。如果您的过滤器工作正常，则只使用过滤器。
滤波器。在这里，我包装一个请求和一个响应，不仅要读取一次。您可以使用ContentCachingRequestWrapper和ContentCachingResponseWrapper。
@Component
public class RequestLogFilter implements Filter {
private final Logger logger = LoggerFactory.getLogger(RequestLogFilter.class);
@Override
public void init(FilterConfig filterConfig) throws ServletException {
// TODO Auto-generated method stub
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
logger.info("======================> FILTER <======================");
HttpServletRequest requestToCache = new ContentCachingRequestWrapper((HttpServletRequest) request);
HttpServletResponse responseToCache = new ContentCachingResponseWrapper((HttpServletResponse) response);
// before method
chain.doFilter(requestToCache, responseToCache);
// after method
// your logic(save to DB, logging...)
getRequestData(request);
getResponseData(response);
}
@Override
public void destroy() {
}
}
-
@Component
public class RequestLogInterceptor extends HandlerInterceptorAdapter {
private final Logger logger = LoggerFactory.getLogger(RequestLogInterceptor.class);
@Autowired
private InboundRequestLogStore inboundRequestLogStore;
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) {
logger.info("====================> INTERCEPTOR <========================");
try {
if (request.getAttribute(InboundRequestAspect.INBOUND_LOG_MARKER) != null) {
InboundRequestLogRecord logRecord = new InboundRequestLogRecord();
logRecord.setIpAddress(request.getRemoteAddr());
// getting request and response body
logRecord.setRequestBody(getRequestData(request));
logRecord.setResponseBody(getResponseData(response));
logRecord.setResponseCode(((HttpServletResponse) response).getStatus());
String uri = request.getScheme() + "://" + request.getServerName()
+ ("http".equals(request.getScheme()) && request.getServerPort() == 80
|| "https".equals(request.getScheme()) && request.getServerPort() == 443 ? ""
: ":" + request.getServerPort())
+ request.getRequestURI()
+ (request.getQueryString() != null ? "?" + request.getQueryString() : "");
logRecord.setUrl(uri);
inboundRequestLogStore.add(logRecord); // save to DB
} else {
((ContentCachingResponseWrapper) response).copyBodyToResponse(); // in other case you send null to the response
}
} catch (Exception e) {
logger.error("error ", e);
try {
((ContentCachingResponseWrapper) response).copyBodyToResponse(); // in other case you send null to the response
} catch (Exception e2) {
// TODO Auto-generated catch block
logger.error("error ", e2);
}
}
}
public static String getRequestData(final HttpServletRequest request) throws UnsupportedEncodingException {
String payload = null;
ContentCachingRequestWrapper wrapper = WebUtils.getNativeRequest(request, ContentCachingRequestWrapper.class);
if (wrapper != null) {
byte[] buf = wrapper.getContentAsByteArray();
if (buf.length > 0) {
payload = new String(buf, 0, buf.length, wrapper.getCharacterEncoding());
}
}
return payload;
}
public static String getResponseData(final HttpServletResponse response) throws UnsupportedEncodingException, IOException {
String payload = null;
ContentCachingResponseWrapper wrapper = WebUtils.getNativeResponse(response, ContentCachingResponseWrapper.class);
if (wrapper != null) {
byte[] buf = wrapper.getContentAsByteArray();
if (buf.length > 0) {
payload = new String(buf, 0, buf.length, wrapper.getCharacterEncoding());
}
wrapper.copyBodyToResponse(); // in other case you send null to the response
}
return payload;
}
}
添加到servlet-context.xml
<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path="/**" />
<beans:bean class="path.to.RequestLogInterceptor"/>
</mvc:interceptor>
</mvc:interceptors>
名称空间：
<beans:beans xmlns="http://www.springframework.org/schema/mvc"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd">
ContentCachingRequestWrapper - http://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/web/util/ContentCachingRequestWrapper.html
ContentCachingResponseWrapper - http://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/web/util/ContentCachingResponseWrapper.html