SpringMVC处理模型数据

目录结构

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    id="WebApp_ID" version="2.5">

    <!-- 配置 org.springframework.web.filter.HiddenHttpMethodFilter: 可以把 POST 
        请求转为 DELETE 或 POST 请求 -->
    <filter>
        <filter-name>HiddenHttpMethodFilter</filter-name>
        <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
    </filter>

    <filter-mapping>
        <filter-name>HiddenHttpMethodFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!-- 配置 DispatcherServlet -->
    <servlet>
        <servlet-name>dispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!-- 配置 DispatcherServlet 的一个初始化参数: 配置 SpringMVC 配置文件的位置和名称 -->
        <!-- 实际上也可以不通过 contextConfigLocation 来配置 SpringMVC 的配置文件, 而使用默认的. 默认的配置文件为: 
            /WEB-INF/<servlet-name>-servlet.xml -->
        <!-- <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>

</web-app>

dispatcherServlet-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:aop="http://www.springframework.org/schema/aop"
    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/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
    <!-- 配置自定扫描的包 -->
    <context:component-scan base-package="com.springmvc"></context:component-scan>

    <!-- 配置视图解析器: 如何把 handler 方法返回值解析为实际的物理视图 -->
    <bean
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/views/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>

    <!-- 配置视图 BeanNameViewResolver 解析器: 使用视图的名字来解析视图 -->
    <!-- 通过 order 属性来定义视图解析器的优先级, order 值越小优先级越高 -->
    <bean class="org.springframework.web.servlet.view.BeanNameViewResolver">
        <property name="order" value="100"></property>
    </bean>

    <!-- 配置国际化资源文件 -->
    <!-- 
    <bean id="messageSource"
        class="org.springframework.context.support.ResourceBundleMessageSource">
        <property name="basename" value="i18n"></property>
    </bean>
 -->
    <!-- 配置直接转发的页面 -->
    <!-- 可以直接相应转发的页面, 而无需再经过 Handler 的方法. -->
    <!-- <mvc:view-controller path="/success" view-name="success" /> -->

    <!-- 在实际开发中通常都需配置 mvc:annotation-driven 标签 -->
    
    
    <mvc:annotation-driven></mvc:annotation-driven>

</beans>

test

package com.springmvc;

import java.io.IOException;
import java.io.Writer;
import java.util.Arrays;
import java.util.Date;
import java.util.Map;

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

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CookieValue;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.SessionAttributes;
import org.springframework.web.servlet.ModelAndView;

import com.springmvc.entities.User;

@SessionAttributes(value = { "user" }, types = { String.class }) // user为键 和string类型的放入session中
@RequestMapping("/springmvc")  
@Controller
public class SpringMVCTest {

    private static final String SUCCESS = "success";

    @RequestMapping("/testSessionAttributes")
    public String testSessionAttributes(Map<String, Object> map) {
        User user = new User("Tom", "123456", "tom@aaaa.com", 15);
        map.put("user", user);
        map.put("school", "yp");
        return SUCCESS;
    }

    @RequestMapping("/testMap")
    public String testMap(Map<String, Object> map) {
        System.out.println(map.getClass().getName());
        map.put("names", Arrays.asList("AA", "BB", "CC"));
        return SUCCESS;
    }

    @RequestMapping("/testModelAndView")
    public ModelAndView testModelAndView() {
        String viewName = SUCCESS;
        ModelAndView modelAndView = new ModelAndView(viewName);

        modelAndView.addObject("modelAndView", "testModelAndView");

        return modelAndView;
    }
}

index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
    <a href="springmvc/testModelAndView">testModelAndView</a>
    
    <a href="springmvc/testMap">testMap</a>
    
    <a href="springmvc/testSessionAttributes">testSessionAttributes</a>
</body>
</html>

success.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
    ModelAndView :${requestScope.modelAndView}
    <br><br>
    
    Map: ${requestScope.names}
    <br><br>
    
    SessionAttributes:
    ${sessionScope.user.username}
    <br>
    School:${sessionScope.school}
    
    
    
    
</body>
</html>