我想在我的Servlet中添加日志记录,因此我创建了一个过滤器(Filter),它应该显示请求并跳转到Servlet。但不幸的是,我遇到了异常:
java.lang.IllegalStateException: getReader() has already been called for this request
at org.apache.catalina.connector.Request.getInputStream(Request.java:948)
at org.apache.catalina.connector.RequestFacade.getInputStream(RequestFacade.java:338)
at com.noelios.restlet.ext.servlet.ServletCall.getRequestEntityStream(ServletCall.java:190)
所以为了解决这个问题,我找到了使用Wrapper的解决方案,但它并不起作用。在代码中还能使用/更改什么呢?有什么想法吗?
[MyHttpServletRequestWrapper]
public class MyHttpServletRequestWrapper extends HttpServletRequestWrapper
{
public MyHttpServletRequestWrapper(HttpServletRequest request)
{
super(request);
}
private String getBodyAsString()
{
StringBuffer buff = new StringBuffer();
buff.append(" BODY_DATA START [ ");
char[] charArr = new char[getContentLength()];
try
{
BufferedReader reader = new BufferedReader(getReader());
reader.read(charArr, 0, charArr.length);
reader.close();
}
catch (IOException e)
{
e.printStackTrace();
}
buff.append(charArr);
buff.append(" ] BODY_DATA END ");
return buff.toString();
}
public String toString()
{
return getBodyAsString();
}
}
[我的过滤器]
public class MyFilterimplements Filter
{
@Override
public void init(FilterConfig filterConfig) throws ServletException
{
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException
{
final HttpServletRequest httpServletRequest = (HttpServletRequest) request;
final HttpServletResponse httpServletResponse = (HttpServletResponse) response;
final HttpServletRequestWrapper requestWrapper = new MyHttpServletRequestWrapper(httpServletRequest);
final String requestBody = requestWrapper.toString();
chain.doFilter(request, response);
}
}