spring mvc xml配置拦截器

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spring mvc xml配置拦截器

博客分类：

Java Web
spring MVC

springspringmvcschema基于xml拦截器

spring mvc 有两种配置：（1）注解；（2）基于xml（schema）。

公司要求使用xml方式的，其实在我看来注解更方便；

如何使用xml配置spring mvc的拦截器呢？

场景：比如用户通过浏览器访问我的网站时，我需要判断用户是否已经登录过，若登录过，则允许访问，否则自动跳转到登陆页面。

spring mvc中拦截器类需要继承HandlerInterceptorAdapter类

代码如下：

Java代码

package com.yj.mvc.controler.interceptor;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
public class HandlerInterceptor1 extends HandlerInterceptorAdapter {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
System.out.println("===========HandlerInterceptor1 preHandle");
return true;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
System.out.println("===========HandlerInterceptor1 postHandle");
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
System.out.println("===========HandlerInterceptor1 afterCompletion");
}
}

比较重要的方法时preHandle，如果返回false，就请求不会往下传递，就会拒绝请求。所以该方法可用于进行访问控制。

控制器代码如下：

Java代码

package com.yj.mvc.controler;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;
import org.springframework.web.servlet.view.json.MappingJacksonJsonView;
public class DemoController implements Controller {
private String name;
private String age;
public ModelAndView handleRequest(HttpServletRequest request,
HttpServletResponse response) throws Exception {
System.out.println("request.getRequestURL():"+request.getRequestURL());
System.out.println("request.getServletPath():"+request.getServletPath());
Map root = new HashMap();
ModelAndView modelAndView =new ModelAndView(new MappingJacksonJsonView(), root);
return modelAndView;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
}

spring mvc配置文件：springmvc-servlet.xml

Xml代码

<?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:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">
<bean
class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter" />
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass"
value="org.springframework.web.servlet.view.JstlView" />
<property name="viewNames">
<list>
<value>org.springframework.web.servlet.view.json.MappingJacksonJsonView
</value>
</list>
</property>
</bean>
<mvc:resources mapping="/resource/**" location="/WEB-INF/resource/" />
</beans>

web.xml配置如下：

Xml代码

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0">
<display-name></display-name>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
classpath:beans.xml
</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>

beans.xml内容：

Java代码

<?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:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.2.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.2.xsd"
default-lazy-init="false">
<bean id="urlMapping"
class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property name="mappings">
<props>
<prop key="demo.action">demoController</prop>
<prop key="demo222.action">demoController</prop>
</props>
</property>
<property name="interceptors">
<list>
<ref bean="handlerInterceptor2" />
</list>
</property>
</bean>
<bean id="demoController" class="com.yj.mvc.controler.DemoController">
</bean>
<bean id="handlerInterceptor2" class="com.yj.mvc.controler.interceptor.HandlerInterceptor1" />
</beans>

启动服务器后，在浏览器中访问：http://localhost:8080/springmvc_xml/demo.action

后台打印：

===========HandlerInterceptor1 preHandle

request.getRequestURL():http://localhost:8080/springmvc_xml/demo.action

request.getServletPath():/demo.action

===========HandlerInterceptor1 postHandle

===========HandlerInterceptor1 afterCompletion

项目使用maven构建

IDE:eclipse

项目结构：

源代码见附件springmvc_xml.zip

springmvc_xml.zip (11.1 KB)
下载次数: 4

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