5_拦截器

建立拦截器

1. package com.happy.middleware;
2.  
3. import org.springframework.web.servlet.HandlerInterceptor;
4. import org.springframework.web.servlet.ModelAndView;
5.  
6. import javax.servlet.http.HttpServletRequest;
7. import javax.servlet.http.HttpServletResponse;
8.  
9.  
10. public class InterceptorConfig implements HandlerInterceptor {
11.  
12.  
13. /**
14. * 进入controller层以前拦截请求
15. *
16. * @param httpServletRequest
17. * @param httpServletResponse
18. * @param o
19. * @return
20. * @throws Exception
21. */
22. @Override
23. public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
24.  
25. System.out.print("拦截啦");
26.  
27. return true;
28. }
29.  
30.  
31. /**
32. * 处理请求完成后视图渲染以前的处理操做
33. *
34. * @param httpServletRequest
35. * @param httpServletResponse
36. * @param o
37. * @param modelAndView
38. * @throws Exception
39. */
40. @Override
41. public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
42.  
43. }
44.  
45. /**
46. * 视图渲染以后的操做
47. *
48. * @param httpServletRequest
49. * @param httpServletResponse
50. * @param o
51. * @param e
52. * @throws Exception
53. */
54. @Override
55. public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
56.  
57. }
58. }

2. 使用拦截器

1. package com.happy.middleware;
2.  
3. import org.springframework.context.annotation.Configuration;
4. import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
5. import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
6.  
7. /**
8. * Created by xiao on 2018/2/22.
9. */
10.  
11. @Configuration
12. public class MyWebAppConfigurer extends WebMvcConfigurerAdapter {
13.  
14. @Override
15. public void addInterceptors(InterceptorRegistry registry) {
16.  
17. registry.addInterceptor(new InterceptorConfig()).addPathPatterns("/**");
18.  
19. super.addInterceptors(registry);
20. }
21. }

3. 控制台数据【访问连接以后】