第八篇：springboot filter配置

首先編寫咱們本身的 filter

@WebFilter(urlPatterns = "/*")
public class MyFilter implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("MyFilter..init..");
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        System.out.println("MyFilter..doFilter..");

        HttpServletRequest request= (HttpServletRequest) servletRequest;
        HttpServletResponse response= (HttpServletResponse) servletResponse;

        String URL=request.getRequestURI();
        if(URL.contains("upload")){
            response.sendRedirect("index.html");
            return;
        }else {
            filterChain.doFilter(servletRequest,servletResponse);
            return;
        }
    }

    @Override
    public void destroy() {
        System.out.println("MyFilter..destroy..");
    }
}

實現 Filter 接口，重寫接口中的 init、doFilter、destory 方法

@WebFilter 標記一個類爲filter，被spring進行掃描，urlPatterns：攔截規則，支持正則

在 doFilter 方法中編寫自定義的邏輯，若是放行 則調用 doFilter（、、）方法

而後咱們須要配置自定義的 Filter ，之前是配置在 web.xml 中，如今咱們須要在 啓動類中加入一行代碼

@SpringBootApplication 
@ServletComponentScan 
public class DemoApplication {、、、、}

 

@ServletComponentScan  會掃描到咱們自定義的 filter