springmvc传值对象及拦截器

第一步，导入spring jar包(commons-logging-1.0.4.jar、jstl.jar)

 

第二步，项目配置文件web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
	http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
	<servlet>
		<servlet-name>dispatcherServlet</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>/WEB-INF/springmvc-servlet.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>
</web-app>

 第三步，springMVC配置文件springmvc-servlet.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:mvc="http://www.springframework.org/schema/mvc"
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="
	http://www.springframework.org/schema/beans 
	http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
	http://www.springframework.org/schema/mvc 
	http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
    http://www.springframework.org/schema/context 
    http://www.springframework.org/schema/context/spring-context-3.0.xsd"
    >

	<!-- 对web包中的所有类进行扫描，以完成Bean创建和自动依赖注入的功能 -->
	<context:component-scan base-package="com.test.controller" />
	
	<!--对模型视图名称的解析，即在模型视图名称添加前后缀 -->
	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
		<property name="prefix" value="/jsp/"></property>
		<property name="suffix" value=".jsp"></property>
	</bean>
	
	<mvc:interceptors>
		<bean class="com.test.interceptor.MyInterceptor1"></bean> <!-- 拦截所有springmvc的url -->
		<mvc:interceptor>
			<mvc:mapping path="/employee" />
			<bean class="com.test.interceptor.MyInterceptor2"></bean>
		</mvc:interceptor>
	</mvc:interceptors>

</beans>

 

第四步，控制器EmployeeController.java

package com.test.controller;

import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class EmployeeController {

	@RequestMapping("/employee")
	public String request(String name, Model model, ModelMap modelMap, HttpServletRequest request) {
		model.addAttribute("model", "测试model.addAttribute()方法");
		modelMap.addAttribute("modelMap1", "测试ModelMap.addAttribute()方法");
		modelMap.put("modelMap2", "测试ModelMap.put()方法");
		request.setAttribute("request1", "测试request.setAttribute()方法");
		request.getSession().setAttribute("session1", "测试request.getSession().setAttribute方法");
		return "result";
	}

}

 

第五步，拦截器MyInterceptor1.java

package com.test.interceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

public class MyInterceptor1 implements HandlerInterceptor {

	public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2,
			Exception arg3) throws Exception {
		System.out.println("最后执行，一般用于释放资源！");
	}

	public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2,
			ModelAndView arg3) throws Exception {
		System.out.println("action执行之后，生成视图之前执行！");
	}

	public boolean preHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2)
			throws Exception {
		System.out.println("action之前执行！");
		return true; // 继续执行action
	}

}

 

拦截器MyInterceptor2.java

package com.test.interceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

public class MyInterceptor2 extends HandlerInterceptorAdapter {

	public boolean preHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2)
			throws Exception {
		System.out.println("MyInterceptor2.preHandle()");
		return true; // 继续执行action
	}

}

 

前台页面/jsp/result.jsp

<%@ page language="java" contentType="text/html; charset=GBK"
    pageEncoding="GBK"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GBK">
<title>结果</title>
</head>
<body>
	${model }<br>
	${requestScope.model }<br>
	${modelMap1 }<br>
	${requestScope.modelMap1 }<br>
	${modelMap2 }<br>
	${requestScope.modelMap2 }<br>
	${requestScope.request1 }<br>
	${sessionScope.session1 }<br>
</body>
</html>

 

浏览器输入：

http://127.0.0.1:9900/springmvc_006/employee

页面显示：

 

后台打印:

action之前执行！

MyInterceptor2.preHandle()

action执行之后，生成视图之前执行！

最后执行，一般用于释放资源！