doPost方法中获取请求信息

BufferedReader br = new BufferedReader(new InputStreamReader((ServletInputStream) request.getInputStream(), "utf-8")); 
        StringBuffer buffer = new StringBuffer("");
        String temp; 
        while ((temp = br.readLine()) != null) { 
            buffer.append(temp);
        }
        br.close();

        String body = buffer.toString();

这样拿到的信息是请求端发来的全部请求信息，你需要对接收到的信息进行处理。