一、首先引入所需要的jar包
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.7</maven.compiler.source>
<maven.compiler.target>1.7</maven.compiler.target>
<spring.webmvc.version>5.1.5.RELEASE</spring.webmvc.version>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.webmvc.version}</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
</dependency>
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-api</artifactId>
<version>7.0</version>
</dependency>
</dependencies>
二、在web.xml中配置springmvc
<?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">
<!--springmv核心配置文件-->
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!--配置spring.xml存放的路径-->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
三、配置springmvc.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/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!--开启注解-->
<context:component-scan base-package="com.shunli"/>
<!--注册拦截器-->
<!--按照interceptor的先后顺序进行拦截-->
<mvc:interceptors>
<mvc:interceptor>
<!--**拦截login下所有的-->
<mvc:mapping path="/login/**"/>
<bean class="com.shunli.core.LoginInterceptor"/>
</mvc:interceptor>
<mvc:interceptor>
<!--可以同一个拦截器配置具体的mapping,*只拦截login下一级的-->
<mvc:mapping path="/login/*"/>
<mvc:mapping path="/user/usersearch"/>
<mvc:mapping path="/user/update"/>
<bean class="com.shunli.core.UserInterceptor"/>
</mvc:interceptor>
</mvc:interceptors>
<!-- SpringMVC注解驱动 -->
<mvc:annotation-driven>
<mvc:message-converters>
<!--bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"/-->
<bean class="org.springframework.http.converter.StringHttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<value>text/plain;charset=utf-8</value>
<value>text/html;charset=UTF-8</value>
</list>
</property>
</bean>
</mvc:message-converters>
</mvc:annotation-driven>
<!-- 映射物理路径 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<!--配置前缀-->
<property name="prefix" value="/"/>
<!--配置后缀-->
<property name="suffix" value=".jsp"/>
</bean>
</beans>
四、controller
package com.shunli.controller;
import com.shunli.entity.User;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import javax.servlet.http.HttpSession;
@Controller
@RequestMapping(value = "/login")
public class LoginController {
@RequestMapping(value = "/login")
@ResponseBody
public String login(){
System.out.println("2.----LoginController.login");
return "login";
}
}
五、拦截器
这里为了演示效果,写了两个拦截器
第一个
package com.shunli.core;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* @author shunli
*/
public class LoginInterceptor implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
System.out.println("1、----LoginInterceptor.preHandle------------");
return true;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
System.out.println("3、----LoginInterceptor.postHandle------------");
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
System.out.println("4、----LoginInterceptor.afterCompletion---------");
}
}
第二个
package com.shunli.core;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class UserInterceptor implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
System.out.println("1----UserInterceptor.preHandle");
return true;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
System.out.println("3----UserInterceptor.postHandle");
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
System.out.println("4----UserInterceptor.afterCompletion");
}
}
当访问http://localhost:8080/login/login时
在控制台打印出的结果
1.单个拦截器的顺序 preHandle–>具体的Controller–>postHandle–>afterCompletion
2.多个拦截器顺序,根据xml中interceptor的先后顺序执行
3.多个拦截器执行,后进先出