Java拦截器读取请求主体使请求为空 [英] Java interceptor reading request body makes the request empty

问题描述

我已经使用spring编写了一个拦截器，该拦截器在preHandle方法中从HTTPServletRequest读取请求主体.请求正文包含json.我也能够读取请求正文，但是请求对象发生了某些事情，请求正文变得空白.并且由于这个请求，它变成了一个不好的请求.任何帮助都感激不尽.预先感谢.

I have written an interceptor using spring that reads the request body from the HTTPServletRequest, in preHandle method. Request body contains json. I am able to read the request body also but something is happening to the request object and the request body is getting blank. And beause of this the request is becoming a bad request. Any help will be much appreciated. Thanks in advance.

推荐答案

我没有使用过JEE拦截器或Spring拦截器，也不知道它们是如何工作的.

I haven't used either JEE interceptors or Spring interceptors and don't know how they work.

但是听起来更简单的方法是使用过滤器(由web.xml配置).由于过滤器是在链中彼此调用的，因此您可以轻松地将转发的HttpServletRequest对象替换为已包装的HttpServletRequest对象(在其中提供主体).

But it sounds like the easier way would be to go with a filter (as configured from the web.xml). Since filters call each other in a chain, you could easily replace the HttpServletRequest object that is forwarded with a wrapped one (where you provide the body).

这可以通过创建您自己的类，扩展 HttpServletRequestWrapper ，然后覆盖适当的方法(getInputStream听起来很像，是吗?).

This could probably be accomplished by creating a class of your own, extending the HttpServletRequestWrapper and then override the appropriate methods (getInputStream sounds like the way to go here, yes?).

您的getInputStream版本将返回您已经阅读的正文的ByteArrayInputStream，或者您认为合适的任何类型的InputStream.

Your version of getInputStream would then return a ByteArrayInputStream of the body you already read, or whatever you kind of InputStream you feel is appropriate.

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