标签：控制 javaee over after style list ide ppi context
基于springMVC
web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0"> <servlet> <servlet-name>HelloMVC</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>HelloMVC</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/applicationContext.xml</param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <servlet> <servlet-name>dispatcher</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>dispatcher</servlet-name> <url-pattern>*.form</url-pattern> </servlet-mapping> <filter> <filter-name>firstTestFilter</filter-name> <filter-class>controller.filter.FirstTestFilter</filter-class> </filter> <filter-mapping> <filter-name>firstTestFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <filter> <filter-name>secondTestFilter</filter-name> <filter-class>controller.filter.secondTestFilter</filter-class> </filter> <filter-mapping> <filter-name>secondTestFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>
mvc的xml文件
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 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.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd"> <!-- 控制器类所在的包--> <context:component-scan base-package="controller"/> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <!-- /WEB-INF/page/意为页面的路径，.jsp为页面格式--> <property name="prefix" value="/WEB-INF/page/"/> <property name="suffix" value=".jsp"/> </bean> <mvc:interceptors> <mvc:interceptor> <!-- 对所有请求都拦截，公共拦截器 --> <mvc:mapping path="/**"/> <bean name="testInterceptor" class="controller.interceptor.TestInterceptor" /> </mvc:interceptor> </mvc:interceptors> </beans>
过滤器
FirstTestFilter
package controller.filter;
import javax.servlet.*;
import java.io.IOException;
public class FirstTestFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
System.out.println("FirstTestFilter.init()");
}
public FirstTestFilter() {
System.out.println("FirstTestFilter.FirstTestFilter()构造方法");
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
System.out.println("FirstTestFilter.doFilter()进来了");
filterChain.doFilter(servletRequest,servletResponse);
System.out.println("FirstTestFilter.doFilter()出去了");
}
@Override
public void destroy() {
}
}
secondTestFilter
package controller.filter;
import javax.servlet.*;
import java.io.IOException;
public class secondTestFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
System.out.println("secondTestFilter.init()");
}
public secondTestFilter() {
System.out.println("secondTestFilter.secondTestFilter()");
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
System.out.println("secondTestFilter.doFilter()进来了");
filterChain.doFilter(servletRequest, servletResponse);
System.out.println("secondTestFilter.doFilter()出去了");
}
@Override
public void destroy() {
}
}
两个过滤在web.xml中配置，按顺序依次执行，先进先出原则
拦截器
TestInterceptor
package controller.interceptor;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class TestInterceptor implements HandlerInterceptor {
public TestInterceptor() {
System.out.println("TestInterceptor的构造方法");
}
//访问action方法之前
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
System.out.println("TestInterceptor进入拦截器");
return true;
}
//访问action之后，返回到页面之前
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
request.setAttribute("hh","ss");
}
//action结束之后，用于释放资源
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
request.setAttribute("hh","aa");
}
}
先执行过滤器后执行拦截器，主要用于对访问action之前和之后的拦截，在mvc的配置文件中配置
标签：控制 javaee over after style list ide ppi context
原文地址：https://www.cnblogs.com/Fan-Mister/p/13175936.html
