标签：get patch pid frame nts 分享 path plugin mapper
编写springmvc中的自定义拦截器
1.实现接口 HandlerInterceptor
package com.kevin.interceptors; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.web.servlet.HandlerInterceptor; import org.springframework.web.servlet.ModelAndView; public class MyHandlerInterceptor implements HandlerInterceptor{ @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { System.out.println("------------------preHandle--------------------------"); return true; } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { System.out.println("------------------postHandle--------------------------"); } @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { System.out.println("------------------afterCompletion--------------------------"); } }
package com.kevin.interceptors; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.web.servlet.HandlerInterceptor; import org.springframework.web.servlet.ModelAndView; public class MyHandlerInterceptor2 implements HandlerInterceptor{ @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { System.out.println("------------------preHandle2--------------------------"); return false; } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { System.out.println("------------------postHandle2--------------------------"); } @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { System.out.println("------------------afterCompletion2--------------------------"); } }
2.在springmvc-servlet.xml的配置文件中加入拦截器配置
<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path="/**"/>
<bean class="com.kevin.interceptors.MyHandlerInterceptor"></bean>
</mvc:interceptor>
<mvc:interceptor>
<mvc:mapping path="/**"/>
<bean class="com.kevin.interceptors.MyHandlerInterceptor2"></bean>
</mvc:interceptor>
</mvc:interceptors>
3.controller
@Controller @RequestMapping("/demo") public class AnnotationController { /** * test annotation springmvc * @return */ @RequestMapping("anno") public ModelAndView testAnnotation(){ ModelAndView mv = new ModelAndView("anno"); mv.addObject("msg", "注解驱动的mvc"); return mv; } }
4.我的tomcat配置
<build>
<plugins>
<!-- 配置Tomcat插件 -->
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<version>${tomcat-maven-plugin.version}</version>
<!-- <tomcat-maven-plugin.version>2.2</tomcat-maven-plugin.version> -->
<configuration>
<port>80</port>
<!-- http://localhost:port/path 使用80端口浏览器输入地址可省略-->
<path>/</path>
<!-- <path>/my-springmvc</path> -->
</configuration>
</plugin>
</plugins>
</build>
5.debug启动项目，
在springmvc入口 DispatcherServlet 中加入断点
chrome浏览器 http://localhost/demo/anno.do
getHandler 方法查找mapper ，返回handler对象和拦截器数组
执行拦截器前置方法
进入方法内
由于 MyHandlerInterceptor2 的 preHandle 方法返回的是 false，执行到拦截器2的preHandler后会进入中间135行的triggerAfterCompletion 方法
此时控制台打印
------------------preHandle--------------------------
------------------preHandle2--------------------------
this.interceptorIndex 的值为1
进入triggerAfterCompletion方法
最终结果为
------------------preHandle-------------------------- ------------------preHandle2-------------------------- ------------------afterCompletion--------------------------
6.如果将MyHandlerInterceptor2的preHandler的返回值改为true，结果是正常的拦截器执行过程
------------------preHandle-------------------------- ------------------preHandle2-------------------------- ------------------postHandle2-------------------------- ------------------postHandle-------------------------- ------------------afterCompletion2-------------------------- ------------------afterCompletion--------------------------
springmvc--拦截器的preHandler返回false后的执行顺序
标签：get patch pid frame nts 分享 path plugin mapper
原文地址：http://www.cnblogs.com/gavin2016/p/6553880.html
