SpringMVC

一、SpringMVC-第一个SpringMVC项目

SpringMVC第一个程序

1、导入依赖

<dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.3.9</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.2</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
    </dependencies>

2、配置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">
    
    <!--注册DispotcherServlet-->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!--关联一个springmvc的配置文件：【servlet-name】-servlet.xml-->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>calsspath:springmvc-servlet.xml</param-value>
        </init-param>
        <!--启动级别-1-->
        <load-on-startup>1</load-on-startup>
    </servlet>
    
    <!--/ 配置所有的请求：（不包括.jsp)-->
    <!--/* 匹配所有的请求： （包括：.jsp)-->
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

3、配置springmvc-config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:util="http://www.springframework.org/schema/util"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/util https://www.springframework.org/schema/util/spring-util.xsd">
	<!--处理器映射器-->
    <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>
    <!--处理器适配器-->
    <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/>

    <!--视图解析器:DispatcherServlet给他的ModeAndView-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="InternalResource">
        <!--前端-->
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <!--后缀-->
        <property name="suffix" value=".jsp"/>

    </bean>

    <!--Handler-->
    <bean id="/hello" class="com.lengzher.controller.HelloController"/>

</beans>

4、编写HelloController控制层

//注意，这里我们先导入Controller接口
public class HelloController implements Controller {

    public ModelAndView handleRequest(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws Exception {
        //ModelAndView 模型和视图
        ModelAndView mv = new ModelAndView();

        //封装对象，放在ModelAndView中，Model
        mv.addObject("msg","HelloSpringMVC!!!");

        //封装要跳转的视图，放在ModelAndView中
        mv.setViewName("hello"); //:/WEB-INF/jsp/hello.jsp


        return mv;

5、编写jsp页面

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>跳转保存</title>
</head>
<body>
#{msg}
</body>
</html>

6、配置tomcat，启动测试

注意：报错404，尝试在项目结构中，添加lib目录，把包全部导进去试试

注解版本

1、导入依赖

2、配置web.xml

3、配置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: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-4.2.xsd
    http://www.springframework.org/schema/mvc
    http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-4.2.xsd">
    <!--自动扫描包，让指定包下的注解生效，由IOC容器统一管理-->
    <context:component-scan base-package="com.lengzher.controller"/>
    <!--关闭对静态资源的访问：.css/.js/.html-->
    <mvc:default-servlet-handler/>
    <!--支持注解驱动-->
    <mvc:annotation-driven/>

    <!--视图解析器:DispatcherServlet给他的ModeAndView-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="InternalResource">
        <!--前端-->
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <!--后缀-->
        <property name="suffix" value=".jsp"/>
    </bean>
    
</beans>

4、controller控制层

@Controller
public class HelloController {
    @RequestMapping("/h1")
    public String hello(Model model){
        //封装数据
        model.addAttribute("msg","Hello,SpringMVC-two");

        return "hello";
    }
}