我正在使用以下包装器在请求中添加标头及其添加标头
final class MutableHttpServletRequest extends HttpServletRequestWrapper {
// holds custom header and value mapping
private final Map<String, String> customHeaders;
public MutableHttpServletRequest(HttpServletRequest request){
super(request);
this.customHeaders = new HashMap<String, String>();
}
public void putHeader(String name, String value){
this.customHeaders.put(name, value);
}
public String getHeader(String name) {
// check the custom headers first
String headerValue = customHeaders.get(name);
if (headerValue != null){
return headerValue;
}
// else return from into the original wrapped object
return ((HttpServletRequest) getRequest()).getHeader(name);
}
public Enumeration<String> getHeaderNames() {
// create a set of the custom header names
Set<String> set = new HashSet<String>(customHeaders.keySet());
// now add the headers from the wrapped request object
@SuppressWarnings("unchecked")
Enumeration<String> e = ((HttpServletRequest) getRequest()).getHeaderNames();
while (e.hasMoreElements()) {
// add the names of the request headers into the list
String n = e.nextElement();
set.add(n);
}
// create an enumeration from the set and return
return Collections.enumeration(set);
}
}
带过滤器
@Override
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest req = (HttpServletRequest) request;
MutableHttpServletRequest mutableRequest = new MutableHttpServletRequest(req);
...
mutableRequest.putHeader("x-user-id", "1");
chain.doFilter(mutableRequest, response);
}
但是我无法获得该头的contoller其给定null所以任何人请告诉我如何在过滤器中设置标头并在控制器中访问该标头。
@GetMapping("/api1/temp1")
private ResponseEntity<Object> temp1(@RequestHeader HttpHeaders headers, @RequestHeader(value="x-user-id",required=false) String userId){
System.out.println(userId));
return new ResponseEntity<Object>("temp1 method", HttpStatus.OK);
}
向控制器发出请求时,将发送第一个OPTIONS请求,在该请求中,过滤器将找不到您设置的值。拳头跳过选项请求,然后尝试。
@Override
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest req = (HttpServletRequest) request;
if(!"OPTIONS".equalsIgnoreCase(request.getMethod())) {
MutableHttpServletRequest mutableRequest = new MutableHttpServletRequest(req);
...
mutableRequest.putHeader("x-user-id", "1");
chain.doFilter(mutableRequest, response);
}
}