springMVC拦截器

亦凉 2022-05-16 07:37 189阅读 0赞

配置文件

1.pom.xml

<profiles>
            
            <profile>
                <id>development</id>
                <activation>
                    <jdk>1.8</jdk>
                    <activeByDefault>true</activeByDefault>
                </activation>
                <properties>
                    <maven.compiler.source>1.8</maven.compiler.source>
                    <maven.compiler.target>1.8</maven.compiler.target>
                    <maven.compiler.compilerVersion>1.8</maven.compiler.compilerVersion>
                </properties>
            </profile>
        </profiles>
    
        
        <properties>
            
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            
            <spring.version>5.0.7.RELEASE</spring.version>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>4.12</version>
                <scope>test</scope>
            </dependency>
            
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-core</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-webmvc</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-beans</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-web</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-aop</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-expression</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>commons-logging</groupId>
                <artifactId>commons-logging</artifactId>
                <version>1.2</version>
            </dependency>
        </dependencies>

2.web.xml

<web-app>
      <display-name>MavenSpringMVCInterceptorAndException</display-name>
         
        <filter>      
            <filter-name>CharactorFilter</filter-name>    
            <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>  
            <init-param>   
                <param-name>encoding</param-name>  
                <param-value>utf-8</param-value>   
            </init-param>
            <init-param>
                <param-name>forceEncoding</param-name>
                <param-value>true</param-value>
            </init-param>
        </filter>
        <filter-mapping> 
            <filter-name>CharactorFilter</filter-name>
            <url-pattern>/*</url-pattern>
        </filter-mapping>
    
        
        
        <servlet>
            <servlet-name>springDispatcherServlet</servlet-name>
            <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
            
            <init-param>
                <param-name>contextConfigLocation</param-name>
                <param-value>classpath:springMVC_beans.xml</param-value>
            </init-param>
            
            <load-on-startup>1</load-on-startup>
        </servlet>
    
        
        
        <servlet-mapping>
            <servlet-name>springDispatcherServlet</servlet-name>
            <url-pattern>/</url-pattern>
        </servlet-mapping>
    </web-app>

3.springMVC\_beans.xml

<context:component-scan base-package="com.xalo.controller"></context:component-scan>
     
       <mvc:annotation-driven></mvc:annotation-driven>
       
       <mvc:default-servlet-handler/>
    
         
      <mvc:interceptors>
            <mvc:interceptor>
                
                <mvc:mapping path="/hello"/>
                
                <mvc:exclude-mapping path="/hellom"/>
                
                <bean class="com.xalo.interceptor.TestInterceptor"></bean>
            </mvc:interceptor>
        </mvc:interceptors> 
    
        
        <bean id="viewParse" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            <property name="prefix" value="/"></property>  
            <property name="suffix" value=".jsp"></property> 
        </bean>

4.com.xalo.controller

//LoginController.java
    @Controller
    public class LoginController {
        // 拦截器的使用
        @RequestMapping("/hello")
        public String testIntercetor() {
            System.out.println("拦截器测试......");
            return "home";
        }
    
        @RequestMapping("/hellom")
        public String testNoIntercetor() {
            System.out.println("不拦截......");
            return "index";
        }
    }

5.com.xalo.intercetptor

public class TestInterceptor implements HandlerInterceptor { 
         /** * 在执行controller的方法之前执行 返回值为false时,不放行; 为true时,放行. */
         @Override
        public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
                throws Exception {   
            System.out.println("preHandle放行......");
            return true;
        }
       /** * 执行被拦截的controller的方法,在view被渲染之前调用. * 此方法执行的大前提: preHandle方法的返回值为true,才会执行 */
        @Override
        public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
                ModelAndView modelAndView) throws Exception {       
            System.out.println("界面渲染之前......");
        }
        /** *在controller的方法执行完毕之后,会执行的方法. 一般进行资源的清理 * 此方法执行的大前提: preHandle方法的返回值为rue,才会执行 */
         @Override
        public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
                throws Exception {      
             System.out.println("方法执行完毕,清理资源......");
        }
    }

6.home.jsp  
7.index.jsp

maven重新导入出现:

java.lang.ClassNotFoundException: org.springframework.web.filter.CharacterEncodingFilter
     
     解决方法:
        右击项目-->properties-->Deployment Assembly-->点击add添加maven依赖，最后点击Ok 即可