异常:getInputStream() has already been called for this request

异常:getInputStream() has already been called for this request...

造成异常的代码: 从请求中获取body参数

BufferedReader reader = request.getReader();
            while ((str = reader.readLine()) != null) {
                requestJson += str;
            }
            reader.close();
           

原因: 1.重复调用 2.request.getReader获取不到值

解决办法:在获取body 参数的同时,先判断下请求数据流的长度,就完美解决啦

int len = request.getContentLength();
        if (len != -1) {
            BufferedReader reader = request.getReader();
            while ((str = reader.readLine()) != null) {
                requestJson += str;
            }
            reader.close();
        }