Spring boot 响应过滤器

Spring Boot是一个用于构建独立的、生产级别的Spring应用程序的框架，它可以简化Spring应用程序的开发过程。在Spring Boot中，响应过滤器是一个非常有用的特性，它可以对输出的响应进行处理和修改。本文将介绍Spring Boot响应过滤器的概念、用途以及如何在应用程序中实现它。

java
@Component
public class CustomResponseFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        
        // 对响应进行处理和修改
        response.addHeader("Custom-Header", "Custom Value");
        
        filterChain.doFilter(servletRequest, servletResponse);
    }
}

java
@Component
public class CorsResponseFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        
        // 添加跨域控制头部信息
        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE");
        response.setHeader("Access-Control-Allow-Headers", "Content-Type");
        
        filterChain.doFilter(servletRequest, servletResponse);
    }
}