背景

由于环境升级，需要重新设置header中的 一个值，暂设定为 org . http 请求时加入在header中加入org,但在filter中，会通过验证，生成新的org，需要覆盖原来header中的org.

修改 filter 。代码是在网上找的一部分，根据自己的需要进行调整了。

@Component@Slf4j@WebFilter(urlPatterns = { "/" }, filterName = "authorFilter")public class DemoFilter implements Filter {    @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse,                                   FilterChain filterChain) throws IOException, ServletException {        HttpServletRequest req = (HttpServletRequest) servletRequest;        req.setAttribute("hdd","tttt");        HeaderMapRequestWrapper requestWrapper = new HeaderMapRequestWrapper(req);        requestWrapper.addHeader("realm","test");        log.info("header-->{}",getHeadKeyAndValue(req));        filterChain.doFilter(requestWrapper, servletResponse);    }    private Map
    
      getHeadKeyAndValue(HttpServletRequest httpRequest) {        Map
     
       header = new HashMap<>();        Enumeration
      
        headerNames = httpRequest.getHeaderNames();        while (headerNames.hasMoreElements()) {            String nextElement = headerNames.nextElement();            header.put(nextElement, httpRequest.getHeader(nextElement));        }        return header;    }}@Slf4jpublic class HeaderMapRequestWrapper extends HttpServletRequestWrapper {    /**     * construct a wrapper for this request     *     * @param request     */    public HeaderMapRequestWrapper(HttpServletRequest request) {        super(request);    }    private Map
       
         headerMap = new HashMap<>();    /**     * add a header with given name and value     *     * @param name     * @param value     */    public void addHeader(String name, String value) {        headerMap.put(name, value);    }    @Override    public String getHeader(String name) {        log.info("getHeader --->{}",name);        String headerValue = super.getHeader(name);        if (headerMap.containsKey(name)) {            headerValue = headerMap.get(name);        }        return headerValue;    }    /**     * get the Header names     */    @Override    public Enumeration
        
          getHeaderNames() {        List
         
           names = Collections.list(super.getHeaderNames()); for (String name : headerMap.keySet()) { names.add(name); } return Collections.enumeration(names); } @Override public Enumeration
          
            getHeaders(String name) { log.info("getHeaders --->>>>>>{}",name); List
           
             values = Collections.list(super.getHeaders(name)); log.info("getHeaders --->>>>>>{}",values); if (headerMap.containsKey(name)) { log.info("getHeaders --->{}",headerMap.get(name)); values = Arrays.asList(headerMap.get(name)); } return Collections.enumeration(values); }}
           
          
         
        
       
      
     
    

经过测试，在header解析时，是通过getHeaders方法，这个地方原来的时候是通过，values直接添加新的header,组成了一个 header的数组，而不是覆盖。