Spring MVC在控制器之前获取POST主体

Question

I need to read POST requests body without consuming it.

I've tried it in a several ways in my custom HandlerInterceptor and nothing works. All I've tried to do to wrap and cache request bodies, at a some point, didn't work, probably even because I cannot control what Spring does.

So I thinked another thing: at some point Spring will try to map request body to an object and pass it to the right Controller. I can intercept this action and get that object before the Controller is called?

Answer 1

Once the request body is read from the request before reaching controller you can not use anywhere. So what you can do is to read the body from HttpServletRequest in the Filter implementation and set it in ThreadLocal variable. Then you can read from that ThreadLocal . Below is the sample code.

Inside Filter implementation class

try {
    YourModel yourModel = // Read the request body

    RequestContextHolder.setContext(yourModel);
}finally {
    RequestContextHolder.clearContext();
}

and at any point of time in the current request you can do like below.

RequestContextHolder.getContext();

Here is the RequestContextHolder class

public class RequestContextHolder {

    private static final ThreadLocal<YourModel> THREAD_LOCAL = new ThreadLocal<>();

    public static void setContext(YourModel yourModel) {
        THREAD_LOCAL.set(yourModel);
    }

    public static YourModel getContext() {
       return THREAD_LOCAL.get();
    }

    public static void clearContext() {
       THREAD_LOCAL.remove();
    }
}

Answer 2

I've found a solution: using a CommonsRequestLoggingFilter Spring can log even the payload of the requests. The only bother I'm finding is that I can read the payload only in afterRequest method because in the beforeRequest is absent.

More info on CommonsRequestLoggingFilter here .