SpringMVC拦截器简单使用

妖狐艹你老母 2022-08-26 11:18 230阅读 0赞

一、拦截器的配置

1、传统的配置

Xml代码 [![收藏代码][icon_star.png]][icon_star.png 1]

1.  **<****bean**
2.  class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" **>**
3.  **<****property** name="interceptors"**>**
4.  
5.  **<****list****>**
6.  **<****ref** bean="commonInterceptor"**/>**
7.  **</****list****>**
8.  **</****property****>**
9.  **</****bean****>**
10.  <!-- 
11.  如果不定义mappingURL，则默认拦截所有对Controller的请求 ; 
12.  可以使用正则表达式对url进行匹配，从而更细粒度的进行拦截(.\*/entryOrJsonController\\.do\\?action=reg.\*); 
13.  \--**>**
14. **<****bean** id="commonInterceptor" class="com.wy.interceptor.CommonInterceptor"**>**
15. **<****property** name="mappingURL" value=".\*/entryOrJsonController\\.do\\?action=reg.\*"**/>**
16. **</****bean****>**

2、基于注解的配置

Xml代码 [![收藏代码][icon_star.png]][icon_star.png 1]

1.  
2.  **<****mvc:interceptors****>**
3.  
4.  **<****mvc:interceptor****>**
5.  **<****mvc:mapping** path="/entryOrJsonController/\*" **/>**
6.  **<****bean** class="com.wy.interceptor.CommonInterceptor"**>****</****bean****>**
7.  **</****mvc:interceptor****>**
8.  **</****mvc:interceptors****>**

二、拦截器类

Java代码 [![收藏代码][icon_star.png]][icon_star.png 1]

1.  **package** com.wy.interceptor; 
2.  
3.  **import** javax.servlet.http.HttpServletRequest; 
4.  **import** javax.servlet.http.HttpServletResponse; 
5.  
6.  **import** org.apache.log4j.Logger; 
7.  **import** org.springframework.web.servlet.HandlerInterceptor; 
8.  **import** org.springframework.web.servlet.ModelAndView; 
9.  
10. **public** **class** CommonInterceptor **implements** HandlerInterceptor \{ 
11. 
12. **private** Logger log = Logger.getLogger(CommonInterceptor.**class**); 
13. 
14. **public** CommonInterceptor() \{ 
15. // TODO Auto-generated constructor stub
16.  \} 
17. 
18. **private** String mappingURL;//利用正则映射到需要拦截的路径 
19. **public** **void** setMappingURL(String mappingURL) \{ 
20. **this**.mappingURL = mappingURL; 
21.  \} 
22. 
23. /\*\*
24.  \* 在业务处理器处理请求之前被调用
25.  \* 如果返回false
26.  \* 从当前的拦截器往回执行所有拦截器的afterCompletion(),再退出拦截器链
27.  \* 
28.  \* 如果返回true
29.  \* 执行下一个拦截器,直到所有的拦截器都执行完毕
30.  \* 再执行被拦截的Controller
31.  \* 然后进入拦截器链,
32.  \* 从最后一个拦截器往回执行所有的postHandle()
33.  \* 接着再从最后一个拦截器往回执行所有的afterCompletion()
34.  \*/
35. @Override
36. **public** **boolean** preHandle(HttpServletRequest request, 
37.  HttpServletResponse response, Object handler) **throws** Exception \{ 
38. // TODO Auto-generated method stub
39.  log.info("==============执行顺序: 1、preHandle================"); 
40.  String url=request.getRequestURL().toString(); 
41. **if**(mappingURL==**null** || url.matches(mappingURL))\{ 
42.  request.getRequestDispatcher("/msg.jsp").forward(request, response); 
43. **return** **false**; 
44.  \} 
45. **return** **true**; 
46.  \} 
47. 
48. //在业务处理器处理请求执行完成后,生成视图之前执行的动作 
49. @Override
50. **public** **void** postHandle(HttpServletRequest request, 
51.  HttpServletResponse response, Object handler, 
52.  ModelAndView modelAndView) **throws** Exception \{ 
53. // TODO Auto-generated method stub
54.  log.info("==============执行顺序: 2、postHandle================"); 
55.  \} 
56. 
57. /\*\*
58.  \* 在DispatcherServlet完全处理完请求后被调用 
59.  \* 
60.  \* 当有拦截器抛出异常时,会从当前拦截器往回执行所有的拦截器的afterCompletion()
61.  \*/
62. @Override
63. **public** **void** afterCompletion(HttpServletRequest request, 
64.  HttpServletResponse response, Object handler, Exception ex) 
65. **throws** Exception \{ 
66. // TODO Auto-generated method stub
67.  log.info("==============执行顺序: 3、afterCompletion================"); 
68.  \} 
69. 
70. \}

注意：注释中的说明。

完整的spring配置文件

Java代码 [![收藏代码][icon_star.png]][icon_star.png 1]

1.  <?xml version="1.0" encoding="UTF-8" ?> 
2.  <beans xmlns="http://www.springframework.org/schema/beans"
3.   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
4.   xmlns:context="http://www.springframework.org/schema/context"
5.   xmlns:mvc="http://www.springframework.org/schema/mvc"
6.   xmlns:util="http://www.springframework.org/schema/util"
7.   xsi:schemaLocation=" 
8.   http://www.springframework.org/schema/beans
9.   http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
10.  http://www.springframework.org/schema/context
11.  http://www.springframework.org/schema/context/spring-context-3.0.xsd
12.  http://www.springframework.org/schema/mvc 
13.  http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
14.  http://www.springframework.org/schema/util 
15.  http://www.springframework.org/schema/util/spring-util-3.0.xsd">
16. 
17.   
20. 
21.   
22.  <mvc:resources mapping="/js/\*\*" location="/js/" /> 
23. 
24.   
25.  <context:component-scan base-**package**="com.wy.controller.annotation" /> 
26. 
27.   
28.  <bean 
29. **class**="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" > 
30.  <property name="interceptors"> 
31.   
32.  <list> 
33.  <ref bean="commonInterceptor"/> 
34.  </list> 
35.  </property> 
36.  </bean> 
37.   
41.  <bean id="commonInterceptor" **class**="com.wy.interceptor.CommonInterceptor"> 
42.  <property name="mappingURL" value=".\*/entryOrJsonController\\.do\\?action=reg.\*"/> 
43.  </bean> 
44. 
45.   
46.  <bean 
47. **class**="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" > 
48.  <property name="messageConverters"> 
49.  <util:list id="beanList"> 
50.  <ref bean="mappingJacksonHttpMessageConverter"/> 
51.  </util:list> 
52.  </property> 
53.  </bean> 
54. 
55.   
60.  <mvc:view-controller path="/hello" view-name="hello" /> 
61. 
62.   
63.   
64.  <bean 
65. **class**="org.springframework.web.servlet.view.InternalResourceViewResolver"> 
66.   
69.  <property name="prefix" value="/WEB-INF/page/" /> 
70.  <property name="suffix" value=".jsp" /> 
71.  </bean> 
72. 
73.   
74.  <bean id="mappingJacksonHttpMessageConverter"
75. **class**="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"> 
76.   
77.  <property name="supportedMediaTypes"> 
78.  <list> 
79.  <value>text/html;charset=UTF-8</value> 
80.  </list> 
81.  </property> 
82.  </bean> 
83. 
84.   
85.  <mvc:interceptors> 
86.   
87.  <mvc:interceptor> 
88.  <mvc:mapping path="/entryOrJsonController/\*" /> 
89.  <bean **class**="com.wy.interceptor.CommonInterceptor"></bean> 
90.  </mvc:interceptor> 
91.  </mvc:interceptors> 
92. 
93.   
105. 
106. </beans>

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