【发布时间】：2014-12-10 09:24:59
【问题描述】：
我有以下问题：我尝试在 Spring 控制器处理之前获取 POST 请求的主体。为此，我使用了 HandlerInterceptorAdapter 的 preHandle() 方法。
如本次讨论中所述Spring REST service: retrieving JSON from Request 我也使用 HttpServletRequestWrapper。使用这个包装器，我设法打印了第一个 POST 请求的正文，但第二个 POST 抛出 IOException: StreamClosed。
您对如何获取所有 POST 请求的正文有任何想法吗？
这是拦截器的 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
【问题讨论】：
标签： spring post interceptor