项目登录页面

运行结果如下：

整体代码布局：

代码如下：

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>lesson0826_web</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <name>lesson0826_web Maven Webapp</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <properties>
    <maven.compiler.source>8</maven.compiler.source>
    <maven.compiler.target>8</maven.compiler.target>
    <servlet.version>4.0.1</servlet.version>
    <jsp.version>2.2</jsp.version>
    <jstl.version>1.2</jstl.version>
    <spring.version>5.3.14</spring.version>
    <commons-dbcp.version>1.4</commons-dbcp.version>
    <mybatis.version>3.4.6</mybatis.version>
    <mybatis-spring.version>1.3.3</mybatis-spring.version>
    <mysql-connector-java.version>8.0.11</mysql-connector-java.version>
    <fastjson.version>1.2.78</fastjson.version>
  </properties>
  <dependencies>
    <!-- 添加javaEE支持 -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>${servlet.version}</version>
      <!-- provided只在编译时支持，发布时不拷贝文件 -->
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>jsp-api</artifactId>
      <version>${jsp.version}</version>
      <!-- provided只在编译时支持，发布时不拷贝文件 -->
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>jstl</groupId>
      <artifactId>jstl</artifactId>
      <version>${jstl.version}</version>
    </dependency>
    <!--引入spring基础模块-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <!-- dbcp连接池 -->
    <dependency>
      <groupId>commons-dbcp</groupId>
      <artifactId>commons-dbcp</artifactId>
      <version>${commons-dbcp.version}</version>
    </dependency>
    <!-- mybatis -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>${mybatis.version}</version>
    </dependency>
    <!-- mybatis spring整合 -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>${mybatis-spring.version}</version>
    </dependency>
    <!--mybatis插件PageHelper-->
    <dependency>
      <groupId>com.github.pagehelper</groupId>
      <artifactId>pagehelper</artifactId>
      <version>5.1.0</version>
    </dependency>
    <dependency>
      <groupId>com.github.abel533</groupId>
      <artifactId>mapper</artifactId>
      <version>3.0.1</version>
    </dependency>
    <!-- mysql驱动类 -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>${mysql-connector-java.version}</version>
    </dependency>
    <!--fastjson处理json数据-->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>fastjson</artifactId>
      <version>${fastjson.version}</version>
    </dependency>
    <!--lombok 简化实体内容-->
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>1.18.24</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.13.2.2</version>
    </dependency>
  </dependencies>
</project>

spring-mvc.xml:(全局时间转换器)

<?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:mvc="http://www.springframework.org/schema/mvc"
       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
        http://www.springframework.org/schema/mvc 
        http://www.springframework.org/schema/mvc/spring-mvc.xsd
        ">
    <!-- 包扫描 -->
    <context:component-scan base-package="com.aaa.demo.controller">
    </context:component-scan>
    <!-- 配置注解驱动 -->
    <mvc:annotation-driven>
        <!-- 配置时间转换器 -->
        <mvc:message-converters>
            <!-- jackson  2.5.x -->
            <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
                <property name="objectMapper">
                    <bean class="com.fasterxml.jackson.databind.ObjectMapper">
                        <property name="dateFormat">
                            <bean class="java.text.SimpleDateFormat">
                                <constructor-arg type="java.lang.String" value="yyyy-MM-dd HH:mm:ss"></constructor-arg>
                            </bean>
                        </property>
                    </bean>
                </property>
            </bean>
        </mvc:message-converters>
    </mvc:annotation-driven>

    <!-- 配置视图解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/page/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

    <!-- 配置静态资源:js,css,html -->
    <mvc:default-servlet-handler/>
</beans>

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">

  <!--编码过滤器-->
  <filter>
    <filter-name>encodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>encodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

  <!--配置springMVC前端控制器:DispatcherServlet-->
  <servlet>
    <servlet-name>DispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <!--配置springMVC文件，文件中有定义的相关组件-->
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:spring-mvc.xml</param-value>
    </init-param>
  </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" %>
<html>
<body>
<h2>Hello World!</h2>
<a href="${pageContext.request.contextPath}/forward/toLogin">跳转到登陆</a>
</body>
</html>

User:

package com.aaa.demo.entity;

import lombok.Data;

@Data
public class User {
    private Integer userId;
    private String userName;
    private String password;
}

Emp:

package com.aaa.demo.entity;

import com.fasterxml.jackson.annotation.JsonFormat;
import com.fasterxml.jackson.databind.DatabindException;
import lombok.Data;
import org.springframework.format.annotation.DateTimeFormat;

import java.util.Date;

@Data
public class Emp {
    private Integer empId;
    private String empName;
    private String sex;
    private Double tall;

    //设置客户端请求时传入的日期格式
    @DateTimeFormat(pattern = "yyyy-MM-dd")
    //让返回的日期数据按指定日期格式呈现
    //@JsonFormat(pattern = "yyyy-MM-dd")
    private Date birthday;
}

CommonResult:

package com.aaa.demo.entity;

import lombok.Data;

/**
 * @author: hy
 * @create: 2022-08-26 09:18:10
 */
@Data
public class CommonResult<T> {
    //成功或失败编码:0成功 其他失败
    private Integer code;
    //提示信息
    private String msg;
    //总记录数
    private Integer count;
    //返回的数据
    private T data;

    public CommonResult(){}

    public CommonResult(Integer code,String msg,Integer count,T data){
        this.code=code;
        this.msg=msg;
        this.count=count;
        this.data=data;
    }

    //增删改成功或者其他操作:参数的data是受影响行数
    public static <T> CommonResult<T> success(T data){
        return new CommonResult<T>(0,"success",0,data);
    }

    //查询记录成功
    public static <T> CommonResult<T> success(Integer count,T data){
        return new CommonResult<>(0,"success",count,data);
    }

    //失败
    public static <T> CommonResult<T> fail(T data){
        return new CommonResult<>(1,"fail",0,data);
    }
}

LoginController :

package com.aaa.demo.controller;

import com.aaa.demo.entity.CommonResult;
import com.aaa.demo.entity.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpSession;

/**
 * 登陆控制器
 */
@RestController
@RequestMapping("/user")
public class LoginController {

    //定义session对象
    @Autowired
    private HttpSession session;

    @RequestMapping("/login")
    public CommonResult login(String userName,String password){
        if("admin".equals(userName) && "123456".equals(password)){
            //模拟从数据库查询回来一个用户对象
        User user = new User();
        user.setUserId(1001);
        user.setUserName(userName);
        user.setPassword(password);
        //将数据存储到session中
        session.setAttribute("user",user);
        return CommonResult.success(user);
    }
        return CommonResult.fail("用户名或密码不正确");
    }

    @RequestMapping("/logout")
    public CommonResult logout(){
        //销毁session
        session.invalidate();
        return CommonResult.success("注销成功");
    }
}

EmpController :

package com.aaa.demo.controller;

import com.aaa.demo.entity.CommonResult;
import com.aaa.demo.entity.Emp;
import org.apache.taglibs.standard.lang.support.ExpressionEvaluatorManager;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.ArrayList;
import java.util.List;

@RestController //只做数据处理，不做视图解析
@RequestMapping("/emp")
public class EmpController {


    /**
     * 查询所有员工
     * @return
     */
    @RequestMapping("/list")
    public CommonResult list(){
        System.out.println("=========查询所有员工==========");
        //模拟从mybatis获取到数据
        List<Emp> empList =getEmpList();
        return CommonResult.success(100,empList);
    }

    /**
     * 根据编号查询员工
     * @param empId
     * @return
     */
    @RequestMapping("/getById/{empId}")
    public CommonResult getById(@PathVariable("empId") Integer empId){

        System.out.println("=========根据编号查询员工:=========="+empId);

        //模拟根据编号返回一个数据，并没有实际去查询
        Emp emp = new Emp();
        emp.setEmpId(1001);
        emp.setEmpName("张三");
        emp.setSex("男");
        emp.setBirthday(java.sql.Date.valueOf("2000-01-01"));
        emp.setTall(1.7);

        return CommonResult.success(emp);
    }

    /**
     * 添加
     * @param emp
     * @return
     */
    @RequestMapping("/add")
    public CommonResult add(Emp emp){
        System.out.println("============添加员工=============");
        System.out.println(emp);

        //返回插入成功的提示
        return CommonResult.success(1);
    }

    /**
     * 修改
     * @param emp
     * @return
     */
    @RequestMapping("/update")
    public CommonResult update(Emp emp){
        System.out.println("============修改员工=============");
        System.out.println(emp);
        return CommonResult.success(1);
    }

    /**
     * 删除
     * @param empId
     * @return
     */
    @RequestMapping("/delete/{empId}")
    public CommonResult delete(@PathVariable("empId") Integer empId){
        System.out.println("============删除员工=============:"+empId);
        return CommonResult.success(1);
    }

    //模拟从mybatis取回数据
    public List<Emp> getEmpList(){
        List<Emp> empList = new ArrayList<>();

        Emp emp = new Emp();
        emp.setEmpId(1001);
        emp.setEmpName("张三");
        emp.setSex("男");
        emp.setBirthday(java.sql.Date.valueOf("2000-01-01"));
        emp.setTall(1.7);

        Emp emp2 = new Emp();
        emp2.setEmpId(1002);
        emp2.setEmpName("李四");
        emp2.setSex("女");
        emp2.setBirthday(java.sql.Date.valueOf("2002-01-01"));
        emp2.setTall(1.6);

        empList.add(emp);
        empList.add(emp2);
        return empList;
    }

}

ForwardContoller :

package com.aaa.demo.controller;

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

/**
 * 统一进行页面跳转
 */
@Controller  //注意此处没有用@RestController，因为返回的结果要进行视图解析
@RequestMapping("/forward")
public class ForwardContoller {
    @RequestMapping("/toLogin")
    public String toLogin(){
        return "login";
    }

    //跳转到员工管理页面
    @RequestMapping("/toEmp")
    public String toEmp(){
        return "emp";
    }
}

login.jsp:

<%--
  Created by IntelliJ IDEA.
  User: henry
  Date: 2022/8/26
  Time: 9:33
  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>
    <form id="loginFrm">
        <table border="1" align="center">
            <tr>
                <td>用户名</td>
                <td>
                    <input type="text" name="userName" id="userName"/>
                </td>
            </tr>
            <tr>
                <td>密码</td>
                <td>
                    <input type="password" name="password" id="password"/>
                </td>
            </tr>
            <tr>
                <td></td>
                <td>
                    <input type="button" value="登陆" id="btnLogin"/>
                </td>
            </tr>
        </table>
    </form>

    <!--引入jquery-->
    <script type="text/javascript" src="${pageContext.request.contextPath}/assets/jq/jquery-1.12.4.min.js"></script>
    <script type="text/javascript">
        //alert($);
        $("#btnLogin").click(function (){
            //单击按钮，发起ajax请求
            $.ajax({
                url:"${pageContext.request.contextPath}/user/login",
                type:"get",
                //ata:{userName:$("#userName").val(),password:$("#password").val()},
                //data:"userName=admin&password=123456"
                data:$("#loginFrm").serialize(),
                dataType:"json",
                success:function (res){
                    //console.log(res);
                    if(res.code==0){
                        alert("登陆成功");
                        //跳转到登录
                        window.location.href="${pageContext.request.contextPath}/forward/toEmp";
                    }else{
                        alert(res.data);
                    }
                },
                error:function (xhr,msg){
                    alert("出错了:"+msg);
                }
            })
        })
    </script>
</body>
</html>

emp.jsp:

<%--
  Created by IntelliJ IDEA.
  User: henry
  Date: 2022/8/26
  Time: 10:29
  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>
<input type="button" value="查询员工" id="btnQuery"/>
<input type="button" value="添加员工" id="btnAdd"/>
<input type="button" value="修改员工" id="btnUpdate"/>
<input type="button" value="删除员工" id="btnDelete"/>
<hr/>
<div id="empList">

</div>


<!--引入jquery-->
<script type="text/javascript" src="${pageContext.request.contextPath}/assets/jq/jquery-1.12.4.min.js"></script>
<script type="text/javascript">
    //页面加载完成，绑定按钮方法
    $(function (){
        $("#btnQuery").click(function (){
            $.ajax({
                url:"${pageContext.request.contextPath}/emp/list",
                type:"get",
                dataType:"json",
                success:function (res){
                    for(var i=0;i<res.data.length;i++){
                        $("#empList").append("<p>"+JSON.stringify(res.data[i])+"</p>")
                    }
                }
            })
        })

        $("#btnAdd").click(function (){
            $.ajax({
                url:"${pageContext.request.contextPath}/emp/add",
                data:{empId:1001,empName:"张三",sex:"男",tall:1.7,birthday:"2020-01-01"},
                type:"post",
                dataType:"json",
                success:function (res){
                    console.log(res);
                    //alert(JSON.stringify(res))
                }
            })
        })

        $("#btnUpdate").click(function (){
            $.ajax({
                url:"${pageContext.request.contextPath}/emp/update",
                data:{empId:1001,empName:"张三",sex:"男",tall:1.7,birthday:"2020-01-01"},
                type:"post",
                dataType:"json",
                success:function (res){
                    console.log(res);
                    //alert(JSON.stringify(res))
                }
            })
        })

        $("#btnDelete").click(function (){
            $.ajax({
                url:"${pageContext.request.contextPath}/emp/delete/999",
                type:"get",
                dataType:"json",
                success:function (res){
                    console.log(res);
                    //alert(JSON.stringify(res))
                }
            })
        })
    })
</script>
</body>
</html>

// A code block
var foo = 'bar';

// A code block
var foo = 'bar';

// A code block
var foo = 'bar';