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项目结构

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pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>org.example</groupId>
  <artifactId>TestSpringMVC3</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <name>TestSpringMVC3 Maven Webapp</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.7</maven.compiler.source>
    <maven.compiler.target>1.7</maven.compiler.target>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>

    <!-- Spring -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>4.3.18.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>4.3.18.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-beans</artifactId>
      <version>4.3.18.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context-support</artifactId>
      <version>4.3.18.RELEASE</version>
    </dependency>


    <!-- 导入SpringMvc 需要的jar包 -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>4.3.18.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>4.3.18.RELEASE</version>
    </dependency>

    <!-- 配置servlet-->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.1.0</version>
      <scope>provided</scope>
    </dependency>


    <!-- jstl -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>
    <!-- 1.2以下的版本 需要加standard架包 -->
    <!--
    <dependency>
      <groupId>taglibs</groupId>
      <artifactId>standard</artifactId>
      <version>1.1.2</version>
    </dependency>
    -->
    <!--配置jsp的依赖 -->
    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>jsp-api</artifactId>
      <version>2.2</version>
      <scope>provided</scope>
    </dependency>

  </dependencies>

  <build>
    <finalName>TestSpringMVC3</finalName>
    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
      <plugins>
        <plugin>
          <artifactId>maven-clean-plugin</artifactId>
          <version>3.1.0</version>
        </plugin>
        <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
        <plugin>
          <artifactId>maven-resources-plugin</artifactId>
          <version>3.0.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.8.0</version>
        </plugin>
        <plugin>
          <artifactId>maven-surefire-plugin</artifactId>
          <version>2.22.1</version>
        </plugin>
        <plugin>
          <artifactId>maven-war-plugin</artifactId>
          <version>3.2.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-install-plugin</artifactId>
          <version>2.5.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-deploy-plugin</artifactId>
          <version>2.8.2</version>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>
</project>

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:p="http://www.springframework.org/schema/p"
       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">
      <!-- 1. 配置  需要扫描的控制层在哪个包  -->
    <context:component-scan base-package="com.test"></context:component-scan>

    <!-- 2 配置 视图解析器 中的 前缀和后缀  -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!-- 设置前缀  -->
        <property name="prefix" value="/WEB-INF/"/>
        <!-- 设置后缀 -->

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

    <!-- 开启注解驱动
      注册了两个数据转换的注解@NumberFormatannotation支持，@DateTimeFormat
      json相关的。。
    -->
    <mvc:annotation-driven></mvc:annotation-driven>

</beans>

web.xml

<?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"
         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>Archetype Created Web Application</display-name>

  <!-- 加入前端控制器 DispatcherServlet -->
  <servlet>
    <servlet-name>dispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

    <!-- 设置 DispatcherServlet 的参数 -->
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:springmvc.xml</param-value>
    </init-param>

    <!-- 1 启动服务器的时候就加载  -->
    <!-- 0 使用的时候再加载 -->
    <load-on-startup>1</load-on-startup>
  </servlet>


  <servlet-mapping>
    <servlet-name>dispatcherServlet</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>


</web-app>

index.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<body>
<h2>Hello World!</h2>
<c:if test="${loginUser==null}">
    请<a href="users/loginUi">登录</a>
</c:if>
<c:if test="${loginUser!=null}">
    ${loginUser.uname}，欢迎您!
</c:if>
</body>
</html>

login.jsp

<%--
  Created by IntelliJ IDEA.
  User: 呆萌老师:QQ:2398779723
  Date: 2019/12/6
  Time: 11:53
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
    String baseurl=request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+request.getContextPath();
    pageContext.setAttribute("baseurl",baseurl);
%>

<html>
<base href="${baseurl}" />
<head>
    <title>Title</title>
</head>
<body>
<!-- http://localhost:8080/testSpringMvc4-->
<form action="${baseurl}/users/checkLogin" method="post">
    <pre>
        ${baseurl}
    用户名：<input type="text" name="uname" />
    密码:<input type="password" name="pwd" />
    <input type="submit" name="sub" value="登录" />
   </pre>

</form>
</body>
</html>

User.java

package com.test.pojo;

public class Users {

    private int uid;

    private String uname;

    private String pwd;

    public int getUid() {
        return uid;
    }

    public void setUid(int uid) {
        this.uid = uid;
    }

    public String getUname() {
        return uname;
    }

    public void setUname(String uname) {
        this.uname = uname;
    }

    public String getPwd() {
        return pwd;
    }

    public void setPwd(String pwd) {
        this.pwd = pwd;
    }

    @Override
    public String toString() {
        return "Users{" +
                "uid=" + uid +
                ", uname='" + uname + '\'' +
                ", pwd='" + pwd + '\'' +
                '}';
    }
}

UserController

package com.test.controller;

import com.test.pojo.Users;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

@Controller
@RequestMapping("/users")
public class UsersController {

    @RequestMapping("/loginUi")
    public String loginUi()
    {
        return "login";
    }

    @RequestMapping("/checkLogin")
    public String checkLogin(Users user, HttpServletRequest request)
    {
        if(user.getUname().equals("daimenglaoshi") && user.getPwd().equals("123"))
        {
            //存入session
            HttpSession session= request.getSession();

            session.setAttribute("loginUser",user);

            //重定向
            return "redirect:/index.jsp";

        }
        else
            return "login";

    }





}