SpringMVC处理模型数据

2022-11-01 15:10:29

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>

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