Springmvc:第一个程序

Posted 2021-03-06 梦想与爱

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一、创建流程

创建maven项目，添加web支持
导入spring-webmvc依赖

解决maven静态资源过滤的问题

    <build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>
    </build>

File---Project Structure---Artifacts-----WEB-INF----右键新建lib文件夹----单击加号，添加jar包

编写WEB.XML

<?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_4_0.xsd"
         version="4.0">
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!--关联springMVC配置-->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc.xml</param-value>
        </init-param>
        <!--执行优先级顺序-->
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

创建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 https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd">
    <!--自动扫描包-->
    <context:component-scan base-package="com.ruanyuan.Controller"/>
    <!-- 让Spring MVC不处理静态资源 js、css、img -->
    <mvc:default-servlet-handler/>
    <!--注册默认梳理请求，返回值，参数的类-->
    <mvc:annotation-driven/>
    <!--视图解析器:DispatcherServlet给他的ModelAndView-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
          id="internalResourceViewResolver">
        <!-- 前缀 -->
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <!-- 后缀 -->
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

创建HelloController

package com.ruanyuan.Controller;

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

import java.lang.annotation.Annotation;

@Controller
@RequestMapping("/HelloController")
public class HelloController {

    //真实访问地址 : 项目名/HelloController/hello
    @RequestMapping("/hello")
    public String sayHello(Model model) {
        //向模型中添加属性msg与值，可以在JSP页面中取出并渲染
        model.addAttribute("msg", "hello,SpringMVC");
        //web-inf/jsp/hello.jsp
        return "hello";
    }
}

创建hello.jsp

<%--
  Created by IntelliJ IDEA.
  User: zbp
  Date: 2020/3/3
  Time: 15:35
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
 ${msg}
</body>
</html>

执行结果

二、拓展

解决中文乱码问题

<!-- 配置过滤器，解决中文乱码的问题 -->
<filter>
 <filter-name>characterEncodingFilter</filter-name>
 <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-
class>
<!-- 指定字符集 -->
<init-param>
 <param-name>encoding</param-name>
 <param-value>UTF-8</param-value>
</init-param>
</filter>
 <filter-mapping>
 <filter-name>characterEncodingFilter</filter-name>
 <url-pattern>/*</url-pattern>
</filter-mapping>

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