Spring MVC---攔截器

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.imooc.app</groupId>
  <artifactId>springmvc</artifactId>
  <packaging>war</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>springmvc Maven Webapp</name>
  <url>http://maven.apache.org</url>


  <properties>
      <spring-version>4.3.14.RELEASE</spring-version>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.10</version>
      <scope>test</scope>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>${spring-version}</version>
    </dependency>

    <dependency>
      <groupId>javax</groupId>
      <artifactId>javaee-api</artifactId>
      <version>7.0</version>
      <scope>provided</scope>
    </dependency>


  </dependencies>
  <build>
    <finalName>springmvc</finalName>
  </build>
</project>

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_3_1.xsd"
         version="3.1">




    <!--
        springmvc的核心servlet
        第一種：[servlet-name]-servlet.xml ,比如：springmvc-servlet.xml
        第二種是：改變命名空間 namespace
        必須配置文件在放入在web-inf目錄下。
        第三種是通過:contextConfigLocation
    -->

    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>namespace</param-name>
            <param-value>imoocmvc</param-value>
        </init-param>
        <!-- 第三種 -->
<!-- <init-param>
    <param-name>springmvc</param-name>
    <param-value>classpath*:imoocmvc.xml</param-value>
</init-param> -->
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>


</web-app>

WEB-INF/imoocmvc.xml

<?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/mvc
       http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">


    <!-- 配置自定義掃描包 -->
    <context:component-scan base-package="com.imooc.web"></context:component-scan>



    <!-- 攔截器的註冊 -->
    <mvc:interceptors>

        <mvc:interceptor>
            <mvc:mapping path="/user/**"/>
            <bean class="com.imooc.core.LogInterceptor"></bean>
        </mvc:interceptor>

        <mvc:interceptor>
            <!--<mvc:mapping path="/user/search"/>
            <mvc:mapping path="/user/updatepwd"/>
            <mvc:mapping path="/user/updateheaderPic"/>-->
            <!--<mvc:mapping path="/user/*"></mvc:mapping>-->
            <mvc:mapping path="/user/**"></mvc:mapping>
            <!--exclude-mapping在所有攔截中進行排除，一般在通配符會有意義。-->
            <mvc:exclude-mapping path="/user/updatepwd"></mvc:exclude-mapping>
            <mvc:exclude-mapping path="/user/updatebackground/*"></mvc:exclude-mapping>
            <bean class="com.imooc.core.LoginInterceptor"></bean>
        </mvc:interceptor>
    </mvc:interceptors>



    <!-- 映射物理路徑 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/pages/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>

</beans>

login.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>登錄頁面</title>
</head>
<body>

    <h1>登錄頁面</h1>
    <div>
        <form action="logined" method="post">
            <p>賬戶：<input type="text" name="account"></p>
            <p>密碼：<input type="password" name="password"></p>
            <p><input type="submit" value="登錄"></p>
        </form>
    </div>
</body>
</html>

User.java

public class User {
    private String account;
    private String password;
}

LogInterceptor.java

 

LoginInterceptor.jaca