看起来restlet框架已经调用
getRequestEntityStream()了Request对象，而该对象又被调用
getInputStream()，因此
getReader()对请求的调用将抛出
IllegalStateException。用于getReader（）和getInputStream（）的Servlet
API文档说：
public java.io.BufferedReader getReader() ... ...Throws: java.lang.IllegalStateException - if getInputStream() method has been called on this request public ServletInputStream getInputStream() ... ... Throws: java.lang.IllegalStateException - if the getReader() method has already been called for this request
从文档看来，我们不能同时对Request对象调用getReader（）和getInputStream（）。我建议您使用
getInputStream()而不是
getReader()包装。
