SpringBoot报错：java.lang.IllegalStateException: getReader() has already been called for this request

淡淡的烟草味﹌ 2024-04-01 14:58 69阅读 0赞

![在这里插入图片描述][798cb9d843f240b786b0cc6000e7fc30.png]  
报错情况如图所示，有多种情况可能导致这个问题，首先就是由于request中的输入流是同一个。因此你如果已经使用了inputstream，那么你就不能再使用getReader去获取流。  
下面是getReader()和getInputStream()的Servlet API文档说的:

public java.io.BufferedReader getReader()
        ...
        ...
    Throws:
        java.lang.IllegalStateException - if getInputStream() method has been called on this request
    
     public ServletInputStream getInputStream()
        ...
        ...
        Throws:
        java.lang.IllegalStateException - if the getReader() method has already been called for this request

解决方法1：  
先将原本的请求进行类型转换为HttpServletRequest，然后在使用ContentCachingRequestWrapper进行请求转换类型。  
我使用的就是这种方式，比较简单好用。

import org.springframework.web.util.ContentCachingRequestWrapper;
    
     @Override
        public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        
            HttpServletRequest request1 = (HttpServletRequest) servletRequest;
            ContentCachingRequestWrapper request = new ContentCachingRequestWrapper(request1);
            }

解决方式2：  
[解决方式2][2]

[798cb9d843f240b786b0cc6000e7fc30.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/01/a083d936ce534762a88fad676fe7ecb0.png
[2]: https://blog.csdn.net/u013092227/article/details/125891359