Summary of springMVC interceptors and filters
- 2020-05-30 20:16:04
- OfStack
Interceptor: used to intercept access to url
Use: permission verification, messy code Settings and so on
Configuration in spring-mvc.xml file:
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.1.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd
http://www.springframework.org/schema/tx
">
<!-- Write interceptor -->
<mvc:interceptors>
<!-- For a particular url intercept -->
<mvc:interceptor>
<mvc:mapping path="/test.do"/>
<bean class="com.hbut.interceptor.TestInterceptor"/>
</mvc:interceptor>
<mvc:interceptor>
<!-- Intercepting a specific module 1 Level to intercept -->
<mvc:mapping path="/test/ x /"/>
<bean class="com.hbut.interceptor.TestInterceptor1"/>
</mvc:interceptor>
<mvc:interceptor>
<!-- Intercepting specific modules -->
<mvc:mapping path="/test/ x "/>
<bean class="com.hbut.interceptor.TestInterceptor2"/>
</mvc:interceptor>
</mvc:interceptors>
Intercept all url
<mvc:interceptors>
<bean class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor"/>
</mvc:interceptors>
java code
package com.hbut.interceptor;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* @Author XiJun.Gong
* @DATE 2016/6/1.
* aim: com.hbut.interceptor
*/
public class TestInterceptor implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
//todo Add the action to be done here code
System.out.println("preHandle");
return true; //todo In this case false The request will not arrive control layer
}
@Override
public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
System.out.println("postHandle"); //todo Can be used to modify information, jumps, etc
}
@Override
public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
System.out.println("afterCompletion"); //todo The last execution
}
}
Another interceptor: much the same
package com.hbut.interceptor;
import org.springframework.ui.ModelMap;
import org.springframework.web.context.request.WebRequest;
import org.springframework.web.context.request.WebRequestInterceptor;
/**
* @Author XiJun.Gong
* @DATE 2016/6/1.
* aim: com.hbut.interceptor
*/
public class Test2Interceptor implements WebRequestInterceptor {
@Override
public void preHandle(WebRequest webRequest) throws Exception {
}
@Override
public void postHandle(WebRequest webRequest, ModelMap modelMap) throws Exception {
}
@Override
public void afterCompletion(WebRequest webRequest, Exception e) throws Exception {
}
}
Filter: relies on servlet container, USES callback function, filter range is large
Interceptors: flexible and dependent on framework containers such as spring and mybatis