前言:通过案例，总结一下spring拦截器和过滤器
过滤器
过滤器依赖于serlvet容器，在容器初始化时生成实例，用于过滤操作，如统一修改字符编码、过滤低俗文字、XSS等危险字符
框架Filter
直接声明配置即可
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| <filter>
<filter-name>encoding</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encoding</filter-name>
<servlet-name>/*</servlet-name>
</filter-mapping>
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自定义Filter
过滤器，实现javax.servlet.Filter接口
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@Slf4j
public class MyFilter1 implements Filter {
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
log.info("MyFilter1 start");
filterChain.doFilter(servletRequest, servletResponse);
log.info("MyFilter1 end");
}
}
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配置
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| <!-- 自定义过滤器：myFilter1 -->
<filter>
<filter-name>myFilter1</filter-name>
<filter-class>com.husky.ssm.common.filter.MyFilter1</filter-class>
</filter>
<!-- 自定义过滤器：myFilter2 -->
<filter>
<filter-name>myFilter2</filter-name>
<filter-class>com.husky.ssm.common.filter.MyFilter2</filter-class>
</filter>
<filter-mapping>
<filter-name>myFilter1</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>myFilter2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
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拦截器
拦截器依赖于web框架，基于Java反射,属于AOP的一种应用，只能对controller请求进行拦截，无法处理访问静态资源的请求
springmvc中，拦截器实现HandlerInterceptor的prehandle、postHandle、afterHandle方法
拦截器案例
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|
@Slf4j
public class MyInterceptor1 implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
log.info("MyInterceptor1 preHandle");
return true;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable ModelAndView modelAndView) throws Exception {
log.info("MyInterceptor1 postHandle");
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable Exception ex) throws Exception {
log.info("MyInterceptor1 afterCompletion");
}
}
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配置
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| <mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path="/**"/>
<bean id="myInterceptor1" class="com.husky.ssm.common.interceptor.MyInterceptor1"/>
</mvc:interceptor>
<mvc:interceptor>
<mvc:mapping path="/**"/>
<bean id="myInterceptor2" class="com.husky.ssm.common.interceptor.MyInterceptor2"/>
</mvc:interceptor>
</mvc:interceptors>
|
执行顺序
过滤器——拦截器pre——controller业务逻辑——拦截器post——拦截器after——过滤器
多个过滤器执行顺序依照配置中的顺序
多个拦截器执行顺序依照配置中的顺序
总结
