SpringMVC基本使用

SpringMVC工作流程

SpringMVC基本使用

xml模式(麻烦，不推荐)

1.1导入依赖

在pom.xml中添加spring-mvc，servlet，jsp的依赖：

<dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-webmvcartifactId>
            <version>5.1.6.RELEASEversion>
        dependency>
        <dependency>
            <groupId>javax.servletgroupId>
            <artifactId>javax.servlet-apiartifactId>
            <version>4.0.1version>
        dependency>
        <dependency>
            <groupId>javax.servlet.jspgroupId>
            <artifactId>javax.servlet.jsp-apiartifactId>
            <version>2.3.3version>
        dependency>

添加了spring-webmvc依赖之后，其他的spring-web,sping-aop,spring-context等等就全部加进来了

1.2配置核心(前端)控制器

web.xml中配置

<web-app xmlns="https://jakarta.ee/xml/ns/jakartaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="https://jakarta.ee/xml/ns/jakartaee https://jakarta.ee/xml/ns/jakartaee/web-app_5_0.xsd"
         version="5.0">

<servlet>
        <servlet-name>springmvcservlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class>
    
    <init-param>
        <param-name>contextConfigLocationparam-name>
        <param-value>classpath:springmvc-servlet.xmlparam-value>
    init-param>
    
    <load-on-startup>1load-on-startup>
servlet>
    
<servlet-mapping>
        <servlet-name>springmvcservlet-name>
        <url-pattern>/url-pattern>
servlet-mapping>

    <filter>
        <filter-name>encodingfilter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilterfilter-class>
        <init-param>
            <param-name>encodingparam-name>
            <param-value>utf-8param-value>
        init-param>
    filter>
    <filter-mapping>
        <filter-name>encodingfilter-name>
        <url-pattern>/*url-pattern>
    filter-mapping>

1.3配置文件

resources文件夹下建立对应配置文件，根据前端控制器绑定的配置文件名

新建 springmvc-servlet.xml

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:p="http://www.springframework.org/schema/p"
       xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping">bean>

    <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter">bean>

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="InternalResourceViewResolver">
        
        <property name="prefix" value="/WEB-INF/jsp/"/>
        
        <property name="suffix" value=".jsp"/>
    bean>
    
    <bean id="/hello" class="com.peppa.web.HelloController"/>
beans>

1.4后端控制器

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;

public class HelloController implements Controller {
     

    @Override
    public ModelAndView handleRequest(javax.servlet.http.HttpServletRequest httpServletRequest, javax.servlet.http.HttpServletResponse httpServletResponse) throws Exception {
     
        ModelAndView modelAndView = new ModelAndView();
        //业务代码
        String  result="HelloSpringMVC";
        modelAndView.addObject("msg",result);
        //视图跳转
        modelAndView.setViewName("test");

        return modelAndView;
    }
}

1.5访问

注解模式(推荐)

导jar和web.xml的步骤是一样的,不一样的地方在于主配置文件和控制层的代码

贴上注解模式的主配置文件

<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 http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <context:component-scan base-package="com.peppa.web.controller"/>

    <mvc:default-servlet-handler/>
    <mvc:annotation-driven/>

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="InternalResourceViewResolver">
        
        <property name="prefix" value="/WEB-INF/jsp/"/>
        
        <property name="suffix" value=".jsp"/>
    bean>
beans>

控制层的代码

@Controller //控制器
@RequestMapping("/Hello") //这个是为了分清模块
public class StudentController {
     
 
    @RequestMapping("/test1")    //链接名
    public String list(){
     
        System.out.println(1);
        return "/index";    //返回的页面
    }
    //这个为ajax的套路
    @RequestMapping("/test2")
    public void list2(HttpServletRequest request, HttpServletResponse response) throws IOException {
     
        String str=JSON.toJSONString("ssssss");
        response.getWriter().println(str);
        response.getWriter().flush();
        response.getWriter().close();
    }
}