一.xml模式

springmvc是个啥我就不多说了,c层框架的boss,要使用肯定第一件事就是导jar包

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>5.1.3.RELEASE</version>
</dependency>

然后在项目中的web.xml中加上

<servlet>
    <servlet-name>springMVC</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:mvc-servlet.xml</param-value>
    </init-param>
</servlet>
<servlet-mapping>
    <servlet-name>springMVC</servlet-name>
    <url-pattern>*.do</url-pattern>
</servlet-mapping>

然后在resources文件夹下弄一个主配置文件详细看注释

<?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:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd">
    <!--1.配置url处理映射
    url处理映射的方式有三种:
    1.BeanNameUrlHandlerMapping[通过url名找到对应bean的name的控制器]
    2.SimpleUrlHandlerMapping:[简单的url处理映射]通过key找到id的控制器 了解就行
    3.ControllerClassNameHandlerMapping[控制器类名处理映射]不要配置路径
    默认路径就是类名,首字母小写,后面加上.do就行-->
    <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"></bean>
    <!--2-->
    <!--<bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">-->
        <!--<property name="mappings">-->
            <!--<props>-->
                <!--<prop key="/student1.do">studentController</prop>-->
            <!--</props>-->
        <!--</property>-->
    <!--</bean>-->
    <!--3-->
    <bean class="org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping">
    </bean>
    <!--2.配置适配器处理适配器-->
    <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"></bean>
    <!--3.配置控制器     相当于配置了访问路径   name="/sutdent.do"      id="studentController"-->
    <bean  class="com.hw.controller.StudentController"></bean>
    <!--4.配置资源视图解析-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!--前缀-->
        <property name="prefix" value="/views/"></property>
        <!--后缀-->
        <property name="suffix" value=".jsp"></property>
    </bean>
</beans>

然后贴上控制层的代码

public class StudentController implements Controller {
    @Override
    public ModelAndView handleRequest(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws Exception {
        ModelAndView view=new ModelAndView("studentlist");//返回的页面
        view.addObject("names","lisi");
        return view;
    }
}

前台 studentlist.jsp代码

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page pageEncoding="utf-8" isELIgnored="false"%>
<html>
<head>
    <title>Title</title>
</head>
<body>
${names}
</body>
</html>

示例

二.然后看看注解式的开发,简单,方便

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

贴上注解化的主配置文件

<?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:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context" 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">
    <!--1.配置注解扫描位置-->
    <context:component-scan base-package="com.hw.controller"/>
    <!--2.配置处理器映射,通过注解查找-->
    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"></bean>
    <!--3.配置适配器-->
    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"/>
    <!--4.配置资源视图解析-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!--前缀-->
        <property name="prefix" value="/"></property>
        <!--后缀-->
        <property name="suffix" value=".jsp"></property>
    </bean>
</beans>

然后是控制层的代码

package com.hw.controller;

import com.alibaba.fastjson.JSON;

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

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


@Controller //控制器
@RequestMapping("/student") //这个是为了分清模块
public class StudentController {

    @RequestMapping("/list")    //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("/list2")
    public void list2(HttpServletRequest request, HttpServletResponse response) throws IOException {
        String str=JSON.toJSONString("ssssss");
        response.getWriter().println(str);
        response.getWriter().flush();
        response.getWriter().close();
    }
}