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SpringMVC拦截器

程序员文章站 2022-07-09 19:07:50
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IDEA中创建maven项目，选择web-app骨架

整体构架

SpringMVC拦截器

web.xml

<?xml version="1.0" encoding="UTF-8"?>

<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/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.uek</groupId>
  <artifactId>springmvc02-study04-Interceptor</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <name>springmvc02-study04-Interceptor Maven Webapp</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <spring.version>5.0.2.RELEASE</spring.version>
  </properties>

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

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

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

    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>servlet-api</artifactId>
      <version>2.5</version>
      <scope>provided</scope>
    </dependency>

    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>jsp-api</artifactId>
      <version>2.0</version>
      <scope>provided</scope>
    </dependency>
  </dependencies>

  <build>
    <finalName>springmvc02-study04-Interceptor</finalName>
    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
      <plugins>
        <plugin>
          <artifactId>maven-clean-plugin</artifactId>
          <version>3.1.0</version>
        </plugin>
        <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
        <plugin>
          <artifactId>maven-resources-plugin</artifactId>
          <version>3.0.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.8.0</version>
        </plugin>
        <plugin>
          <artifactId>maven-surefire-plugin</artifactId>
          <version>2.22.1</version>
        </plugin>
        <plugin>
          <artifactId>maven-war-plugin</artifactId>
          <version>3.2.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-install-plugin</artifactId>
          <version>2.5.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-deploy-plugin</artifactId>
          <version>2.8.2</version>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>
</project>

springmvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       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.xsd
                http://www.springframework.org/schema/context
                http://www.springframework.org/schema/context/spring-context.xsd">
    <!--开启注解的扫描-->
    <context:component-scan base-package="com.uek"></context:component-scan>

    <!--视图解析器对象-->
    <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/pages/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>

    <!--告诉前端控制器，哪些静态资源不拦截-->
    <mvc:resources location="/js/" mapping="/js/**"></mvc:resources>

    <!--配置拦截器-->
    <mvc:interceptors>
        <!--配置具体的拦截器-->
        <mvc:interceptor>
            <!--要拦截的具体方法-->
            <mvc:mapping path="/user/*"/>
            <!--不要拦截的方法
            <mvc:exclude-mapping path=""/>
            -->
            <!--配置拦截器对象-->
            <bean class="com.uek.interceptor.MyInterceptor1"></bean>
        </mvc:interceptor>

        <!--配置第二个拦截器-->
        <mvc:interceptor>
            <!--要拦截的具体方法-->
            <mvc:mapping path="/**"/>
            <!--不要拦截的方法
            <mvc:exclude-mapping path=""/>
            -->
            <!--配置拦截器对象-->
            <bean class="com.uek.interceptor.MyInterceptor2"></bean>
        </mvc:interceptor>
    </mvc:interceptors>

    <!--开启SpringMVC框架注解的支持-->
    <mvc:annotation-driven ></mvc:annotation-driven>

</beans>

index.jsp

<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2020-02-02
  Time: 4:13
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <h3>拦截器</h3>
    <a href="user/testInterceptor">拦截器</a>
</body>
</html>

web.xml

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<!--配置前端控制器-->
<web-app>
  <display-name>Archetype Created Web Application</display-name>

  <servlet>
    <servlet-name>dispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

    <!--全局的初始化参数-->
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:springmvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>

  </servlet>

  <servlet-mapping>
    <servlet-name>dispatcherServlet</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

  <!--配置中文乱码的过滤器-->
  <filter>
    <filter-name>characterEncodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <!--初始化参数-->
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>characterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app>

success.jsp

<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2020-02-02
  Time: 13:52
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <h3>运行成功</h3>
    <% System.out.print("success.jsp执行了..."); %>
</body>
</html>

error.jsp

<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2020-02-02
  Time: 14:13
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <h3>错误页面</h3>
</body>
</html>

controller

@Controller
@RequestMapping("/user")
public class UserController {

    @RequestMapping("/testInterceptor")
    public String testInterceptor(){
        System.out.println("testInterceptor方法执行了...");
        return "success";
    }
}

interceptor

/**
 * 自定义拦截器
 */
public class MyInterceptor1 implements HandlerInterceptor {

    /**
     * 预处理，controller方法执行之前
     * return true：放行，执行下一个拦截器，如果没有，执行controller中的方法
     * return false：不放行
     */
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response,Object handler)throws Exception{
        System.out.println("MyInterceptor1执行了...前111");
        //request.getRequestDispatcher("/WEB-INF/pages/error.jsp").forward(request,response);
        //return false;
        return true;
    }

    /**
     * 后处理
     * controller方法执行之后，success.jsp执行之前
     */
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView)throws Exception{
        System.out.println("MyInterceptor1执行了...后111");
        //可以指定跳转的页面
        //request.getRequestDispatcher("/WEB-INF/pages/error.jsp").forward(request,response);
    }

    /**
     * success.jsp页面执行后，该方法会执行
     */
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)throws Exception{
        System.out.println("MyInterceptor1执行了...最后111");
    }
}


/**
 * 自定义拦截器
 */
public class MyInterceptor2 implements HandlerInterceptor {

    /**
     * 预处理，controller方法执行之前
     * return true：放行，执行下一个拦截器，如果没有，执行controller中的方法
     * return false：不放行
     */
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response,Object handler)throws Exception{
        System.out.println("MyInterceptor2执行了...前222");
        //request.getRequestDispatcher("/WEB-INF/pages/error.jsp").forward(request,response);
        //return false;
        return true;
    }

    /**
     * 后处理
     * controller方法执行之后，success.jsp执行之前
     */
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView)throws Exception{
        System.out.println("MyInterceptor2执行了...后222");
        //可以指定跳转的页面
        //request.getRequestDispatcher("/WEB-INF/pages/error.jsp").forward(request,response);
    }

    /**
     * success.jsp页面执行后，该方法会执行
     */
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)throws Exception{
        System.out.println("MyInterceptor2执行了...最后222");
    }
}
相关标签： SpringMVC springMVC

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