SpringBoot过滤器获取POST请求的JSON参数之后Controller没有参数原因

我会带着你远行 2023-01-15 15:25 117阅读 0赞

开发过程中，需要打印入参并保存到日志，所以在过滤器对request请求进行了相应处理，但是之后请求到Controller之后发现没有入参了，定位原因，发现是inputSteam调用之后无法再次读取，所以需要进行一次封装，将request保存下来，之后将保存的request传递下去即可。

自定义的RequestWrapper

public class RequestWrapper extends HttpServletRequestWrapper { 
        private final byte[] body;
    
        public RequestWrapper(HttpServletRequest request) throws IOException { 
            super(request);
            //保存一份InputStream，将其转换为字节数组
            body = StreamUtils.copyToByteArray(request.getInputStream());
        }
    
    	//转换成String
        public String getBodyString(){ 
            return new String(body,StandardCharsets.UTF_8);
        }
    
        @Override
        public BufferedReader getReader() throws IOException { 
            return new BufferedReader(new InputStreamReader(getInputStream()));
        }
    
    	//把保存好的InputStream，传下去
        @Override
        public ServletInputStream getInputStream() throws IOException { 
    
            final ByteArrayInputStream bais = new ByteArrayInputStream(body);
    
            return new ServletInputStream() { 
    
                @Override
                public int read() throws IOException { 
                    return bais.read();
                }
    
                @Override
                public boolean isFinished() { 
                    return false;
                }
    
                @Override
                public boolean isReady() { 
                    return false;
                }
    
                @Override
                public void setReadListener(ReadListener readListener) { 
                }
            };
        }
    }

在过滤器中对request进行保存，并传递下去。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTM5MTkxNTM_size_16_color_FFFFFF_t_70]

[本文来自][Link 1]

参考:  
https://blog.csdn.net/bo\_hai/article/details/89396237  
https://www.cnblogs.com/hooly/p/10465925.html

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTM5MTkxNTM_size_16_color_FFFFFF_t_70]: /images/20221022/d1cc855ece4641e4b6a7f86738f43efd.png
[Link 1]: https://blog.csdn.net/qq_40866897/article/details/111404480