Question

如何在使用Spring Boot创建的应用程序中为每个调用设置响应头？我想尝试使用过滤器来拦截所有调用，并能够设置响应头。我按照指南Disable browser caching HTML5进行了操作，但只设置了请求标题，并非总是如此。

Answer 1

有三种方法可以做到这一点：

在Controller类中设置特定控制器的响应：

@Controller
@RequestMapping(value = DEFAULT_ADMIN_URL + "/xxx/")
public class XxxController
....
    @ModelAttribute
    public void setResponseHeader(HttpServletResponse response) {
       response.setHeader("Cache-Control", "no-cache");
       ....
    }

或

@RequestMapping(value = "/find/employer/{employerId}", method = RequestMethod.GET)
public List getEmployees(@PathVariable("employerId") Long employerId, final HttpServletResponse response) {
    response.setHeader("Cache-Control", "no-cache");
    return employeeService.findEmployeesForEmployer(employerId);
}

或者您可以将每个调用的响应标头放在应用程序中（这是基于Spring注释的，否则请参阅automatically add header to every response）：

@Component
public class Filter extends OncePerRequestFilter {
....
 @Override
 protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
        throws ServletException, IOException {
    //response.addHeader("Access-Control-Allow-Origin", "*");
    //response.setHeader("Cache-Control", "no-cache, no-store, must-revalidate"); // HTTP 1.1.
    response.setHeader("Cache-Control", "no-store"); // HTTP 1.1.
    response.setHeader("Pragma", "no-cache"); // HTTP 1.0.
    response.setHeader("Expires", "0"); // Proxies.
    filterChain.doFilter(request, response);
 }
}

我发现的最后一种方法是使用扩展HandlerInterceptorAdapter的Interceptor;有关详细信息，请参阅https://www.concretepage.com/spring/spring-mvc/spring-handlerinterceptor-annotation-example-webmvcconfigureradapter
- 创建扩展HandlerInterceptorAdapter的拦截器：

public class HeaderInterceptor extends HandlerInterceptorAdapter {

  @Override
  public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object handler) {
    httpServletResponse.setHeader("Cache-Control", "no-store"); // HTTP 1.1.
    httpServletResponse.setHeader("Pragma", "no-cache"); // HTTP 1.0.
    httpServletResponse.setHeader("Expires", "0"); // Proxies.
    return true;
  }
}

在扩展WebMvcConfigurerAdapter的MvcConfig中，您必须覆盖addInterceptors方法并添加新的拦截器：

@Override
public void addInterceptors(InterceptorRegistry registry) {
    ....
    registry.addInterceptor(new HeaderInterceptor());
}

我希望我能提供帮助！

Answer 2

实施过滤器并由@Component注释注册。 @Order(Ordered.HIGHEST_PRECEDENCE)用于建议执行优先级。

 @Component
    @Order(Ordered.HIGHEST_PRECEDENCE)
    public class NoCacheWebFilter implements Filter {
       private static final Logger logger = LoggerFactory.getLogger(NoCacheWebFilter.class);


    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        logger.debug("Initiating WebFilter >> ");
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest) request;
HeaderMapRequestWrapper requestWrapper = new 
                    HeaderMapRequestWrapper(req);
            // implement you logic to add header
            //requestWrapper.addHeader("remote_addr", "");
        chain.doFilter(requestWrapper, response); 

    }

    @Override
    public void destroy() {
        logger.debug("Destroying WebFilter >> ");
    }
    }

在Spring Boot中设置响应头

2 个答案: