Filter、Interceptor执行顺序

1.环境介绍

　　配置两个Filter、两个Interceptor和一个测试Controller；内容如下

　　

@Configuration
@WebFilter(filterName = "myFilter", urlPatterns = "/*")
public class MyFilter implements Filter {

@Override
 public void init(FilterConfig filterConfig) throws ServletException {
System.out.println("Filter-init1");
 }

@Override
 public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
throws IOException, ServletException {
//修改response
 HttpServletResponse response = (HttpServletResponse)servletResponse;

 byte[] data = "new data".getBytes();
 //通过length控制返回值长度，data的内容添加在原返回内容之前，控制data.length，则只返回data内容
 response.addHeader("Content-Length", "" + data.length);
 ServletOutputStream out = response.getOutputStream();
 out.write(data);
 out.flush();

 System.out.println("doFilter-before1");
 filterChain.doFilter(servletRequest, response);
 System.out.println("doFilter-after1");
 }

@Override
 public void destroy() {
System.out.println("Filter-destroy1");
 }
}

@Configuration
@WebFilter(filterName = "myFilter2", urlPatterns = "/*")
public class MyFilter2 implements Filter {

@Override
 public void init(FilterConfig filterConfig) throws ServletException {
System.out.println("Filter-init2");
 }

@Override
 public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
throws IOException, ServletException {
//修改response
 HttpServletResponse response = (HttpServletResponse)servletResponse;

 byte[] data = "new data".getBytes();
 //通过length控制返回值长度，data的内容添加在原返回内容之前，控制data.length，则只返回data内容
 response.addHeader("Content-Length", "" + data.length);
 ServletOutputStream out = response.getOutputStream();
 out.write(data);
 out.flush();

 System.out.println("doFilter-before2");
 filterChain.doFilter(servletRequest, response);
 System.out.println("doFilter-after2");
 }

@Override
 public void destroy() {
System.out.println("Filter-destroy2");
 }
}

@Component
public class MyInterceptor extends HandlerInterceptorAdapter {

@Override
 public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {
System.out.println("Interceptor-preHandle1");
 return super.preHandle(request, response, handler);
 }

@Override
 public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
 ModelAndView modelAndView) throws Exception {
System.out.println("Interceptor-postHandle1");

 //和filter区别，是可以通过下面的代码拿到控制器及其方法
 HandlerMethod handlerMethod = (HandlerMethod) handler;
 handlerMethod.getMethodAnnotation(Autowired.class);

 super.postHandle(request, response, handler, modelAndView);
 }

@Override
 public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
throws Exception {
System.out.println("Interceptor-afterCompletion1");
 super.afterCompletion(request, response, handler, ex);
 }
}

@Component
public class MyInterceptor2 extends HandlerInterceptorAdapter {

@Override
 public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {
System.out.println("Interceptor-preHandle2");
 return super.preHandle(request, response, handler);
 }

@Override
 public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
 ModelAndView modelAndView) throws Exception {
System.out.println("Interceptor-postHandle2");

 //和filter区别，是可以通过下面的代码拿到控制器及其方法
 HandlerMethod handlerMethod = (HandlerMethod) handler;
 handlerMethod.getMethodAnnotation(Autowired.class);

 super.postHandle(request, response, handler, modelAndView);
 }

@Override
 public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
throws Exception {
System.out.println("Interceptor-afterCompletion2");
 super.afterCompletion(request, response, handler, ex);
 }
}

@RestController
public class HealthCheckController {

    @GetMapping("health/check")
    public String healthCheck() {
        System.out.println("call controller");
        return "OK!!!";
    }
}

　　　

2.测试case

场景	输出	备注
正常	doFilter-before1 doFilter-before2 Interceptor-preHandle1 Interceptor-preHandle2 call controller Interceptor-postHandle2 Interceptor-postHandle1 Interceptor-afterCompletion2 Interceptor-afterCompletion1 doFilter-after2 doFilter-after1
在MyFilter类中不执行filterChain.doFilter(servletRequest, response);	doFilter-before1 doFilter-after1	Filter2、Interceptor和Controller都没有得到执行
MyInterceptor类的preHandle方法返回false	doFilter-before1 doFilter-before2 Interceptor-preHandle1 doFilter-after2 doFilter-after1	后面的Interceptor执行不到 当前Interceptor的postHandle和afterCompletion方法执行不到 Controller执行不到
MyInterceptor类的preHandle方法抛出异常，例如int a =1/0;	doFilter-before1 doFilter-before2 Interceptor-preHandle1 doFilter-after2 doFilter-after1	效果和返回false相同
MyInterceptor类的postHandle方法抛出异常，例如int a =1/0;	doFilter-before1 doFilter-before2 Interceptor-preHandle1 Interceptor-preHandle2 call controller Interceptor-postHandle2 Interceptor-postHandle1 Interceptor-afterCompletion2 Interceptor-afterCompletion1 doFilter-after2 doFilter-after1
MyInterceptor2类的postHandle方法抛出异常，例如int a =1/0;	doFilter-before1 doFilter-before2 Interceptor-preHandle1 Interceptor-preHandle2 call controller Interceptor-postHandle2 Interceptor-afterCompletion2 Interceptor-afterCompletion1 doFilter-after2 doFilter-after1