springMVC之配置

时间：2021-07-17 01:53:39

1、项目结构

springMVC之配置

2、所需jar包

springMVC之配置

3、web.xml文件

<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">

  <display-name>spring</display-name>

      <servlet>

        <servlet-name>springMVC</servlet-name>

        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

        <init-param>

            <param-name>contextConfigLocation</param-name>

            <param-value>/WEB-INF/spring-config.xml</param-value>

        </init-param>

        <load-on-startup>1</load-on-startup>

    </servlet>

    <servlet-mapping>

        <servlet-name>springMVC</servlet-name>

        <url-pattern>/</url-pattern>

    </servlet-mapping>

  <welcome-file-list>

    <welcome-file>index.html</welcome-file>

    <welcome-file>index.htm</welcome-file>

    <welcome-file>index.jsp</welcome-file>

    <welcome-file>default.html</welcome-file>

    <welcome-file>default.htm</welcome-file>

    <welcome-file>default.jsp</welcome-file>

  </welcome-file-list>

</web-app>

load-on-startup：表示启动容器时初始化该Servlet；

url-pattern：表示哪些请求交给Spring Web MVC处理， “/” 是用来定义默认servlet映射的。也可以如“*.html”表示拦截所有以html为扩展名的请求。

自此请求已交给Spring Web MVC框架处理，因此我们需要配置Spring的配置文件，默认DispatcherServlet会加载WEB-INF/配置文件名.xml配置文件

4、spring配置文件

<?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:oxm="http://www.springframework.org/schema/oxm"

    xmlns:context="http://www.springframework.org/schema/context"

    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"

    xsi:schemaLocation="http://www.springframework.org/schema/beans

       http://www.springframework.org/schema/beans/spring-beans-3.0.xsd

       http://www.springframework.org/schema/oxm

       http://www.springframework.org/schema/oxm/spring-oxm-3.0.xsd

       http://www.springframework.org/schema/context

       http://www.springframework.org/schema/context/spring-context-3.0.xsd

       http://www.springframework.org/schema/tx

        http://www.springframework.org/schema/tx/spring-tx-3.0.xsd

         http://www.springframework.org/schema/aop

         http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">

    <!--  通知spring容器通过注解的方式装配bean -->

      <context:annotation-config />

    <!--  通知spring容器采用自动扫描机制查找注解的bean -->

      <context:component-scan base-package="com.*" /> 

    <bean id="viewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver">

        <property name="viewClass"

            value="org.springframework.web.servlet.view.JstlView" />

        <property name="prefix" value="" />

        <property name="suffix" value=".jsp" />

    </bean>

</beans>

　 InternalResourceViewResolver：用于支持Servlet、JSP视图解析。

viewClass：JstlView表示JSP模板页面需要使用JSTL标签库，classpath中必须包含jstl的相关jar包。

prefix和suffix：查找视图页面的前缀和后缀（前缀[逻辑视图名]后缀），比如传进来的逻辑视图名为hello，则该该jsp视图页面应该存放在“WebRoot/*.jsp”。

5、Java代码

package com.controller;

import org.springframework.stereotype.Controller;

import org.springframework.ui.Model;

import org.springframework.web.bind.annotation.RequestMapping;

@Controller

public class ProductsController {

    @RequestMapping("/testSpringMVC")

    public String testSpringMVC(String name, Model model){

        System.out.println("name = "+name);

        model.addAttribute("name", name);

        return "success";

    }

}

6、视图页面

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <base href="<%=basePath%>">

  </head>

  <body>

    <form action="testSpringMVC" method="post">

          <input type="text" name="name">

        <input type="submit" value="确定">

    </form>  </body>

</html>

success.jsp

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <base href="<%=basePath%>">

    <title>success</title>

  </head>

  <body>

    ${name},success. <br>

  </body>

</html>

7、报错

Caused by: java.lang.NoClassDefFoundError: javax/servlet/jsp/jstl/core/Config

at org.springframework.web.servlet.support.JstlUtils.exposeLocalizationContext(JstlUtils.java:101)
at org.springframework.web.servlet.view.JstlView.exposeHelpers(JstlView.java:135)
at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:146)
at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303)
at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1228)
at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1011)

at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:955)

解决方案1：选中工程，右键 --> Build Path --> Configure Build Path --> Libraries --> Add Libraries --> MyEclipse Libraries --> 选择一个jstl包引入

解决方案2：引入jstl.jar    standard.jar两个包

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