springmvc实现简单的CRUD

于 2022-12-25 11:52:51 发布
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本文链接：https://blog.youkuaiyun.com/weixin_67283973/article/details/128434121
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这篇博客详细介绍了如何使用SpringMVC框架实现简单的CRUD操作。内容涵盖pojo类定义、DAO层的模拟数据存储、控制器层的编写、项目配置文件如pom.xml、web.xml和springmvc.xml的设置，以及前端页面的实现，包括添加、修改、查询、列表展示等功能。虽然没有涉及数据库连接，但通过map集合存储数据，展示了基本的CRUD流程。

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1.pojo类

package com.sunyu.pojo;

public class Employee {
    private Integer id;
    private String lastName;
    private String email;
    private Integer gender;
    public Employee(){}

    public Employee(Integer id, String lastName, String email, Integer gender) {
        this.id = id;
        this.lastName = lastName;
        this.email = email;
        this.gender = gender;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public Integer getGender() {
        return gender;
    }

    public void setGender(Integer gender) {
        this.gender = gender;
    }

    @Override
    public String toString() {
        return "Employee{" +
                "id=" + id +
                ", lastName='" + lastName + '\'' +
                ", email='" + email + '\'' +
                ", gender=" + gender +
                '}';
    }
}

2.DAO类（由于没有使用数据库，所以在dao类中添加了map集合储存数据）

package com.sunyu.DAO;

import com.sunyu.pojo.Employee;
import org.springframework.stereotype.Repository;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

/**
 * Date:2022/7/8
 * Author:ybc
 * Description:
 */
@Repository
public class EmployeeDao {

    private static Map<Integer, Employee> employees = null;

    static{
        employees = new HashMap<Integer, Employee>();

        employees.put(1001, new Employee(1001, "E-AA", "aa@163.com", 1));
        employees.put(1002, new Employee(1002, "E-BB", "bb@163.com", 1));
        employees.put(1003, new Employee(1003, "E-CC", "cc@163.com", 0));
        employees.put(1004, new Employee(1004, "E-DD", "dd@163.com", 0));
        employees.put(1005, new Employee(1005, "E-EE", "ee@163.com", 1));
    }

    private static Integer initId = 1006;

    public void save(Employee employee){
        if(employee.getId() == null){
            employee.setId(initId++);
        }
        employees.put(employee.getId(), employee);
    }

    public Collection<Employee> getAll(){
        return employees.values();
    }

    public Employee get(Integer id){
        return employees.get(id);
    }

    public void delete(Integer id){
        employees.remove(id);
    }

}

3.控制层（暂时不需要sevice层）

package com.sunyu.controller;

import com.sunyu.DAO.EmployeeDao;
import com.sunyu.pojo.Employee;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import java.util.Collection;

@Controller
public class EmpController {
    /**
     * 登录
     */

    @Autowired
    private EmployeeDao employeeDao;


    @RequestMapping(value = "/text", method = RequestMethod.GET)
    public String text(Model model) {
        Collection<Employee> all = employeeDao.getAll();
        model.addAttribute("all", all);
        return "employee_list";
    }

    /**
     * 跳转道添加页面
     *
     * @return
     */
    @RequestMapping("/to/add")
    public String toAdd() {
        return "employee_add";
    }

    /**
     * 实现添加员工信息
     *
     * @param employee
     * @return
     */
    @RequestMapping(value = "/employee", method = RequestMethod.POST)
    public String addEmpInfor(Employee employee) {
        employeeDao.save(employee);
        return "redirect:/text";
    }

    /**
     * 实现删除员工信息
     */
    @RequestMapping(value = "/employee/{id}", method = RequestMethod.DELETE)
    public String deleteEmpInfor(@PathVariable("id") Integer id) {
        employeeDao.delete(id);
        return "redirect:/text";
    }

    /**
     * 修改员工信息
     */
    @RequestMapping(value = "/employee", method = RequestMethod.PUT)
    public String insert(Employee employee) {
        employeeDao.save(employee);
        return "redirect:/text";
    }
    /**
     * 查询员工信息
     */
    @RequestMapping(value = "/employee/{id}",method = RequestMethod.GET)
    public String getEmpInfor(@PathVariable("id") Integer id,Model model){
        Employee employee = employeeDao.get(id);
        model.addAttribute("employee",employee);
        return "employee_update";
    }
}

4.pom.xml文件

<?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>springmvcCRUD</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>
    <packaging>war</packaging>
    <dependencies>
        <!-- SpringMVC -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.3.1</version>
        </dependency>
        <!-- 日志 -->
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <version>1.2.3</version>
        </dependency>
        <!-- ServletAPI -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        <!-- Spring5和Thymeleaf整合包 -->
        <dependency>
            <groupId>org.thymeleaf</groupId>
            <artifactId>thymeleaf-spring5</artifactId>
            <version>3.0.12.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.jetbrains</groupId>
            <artifactId>annotations</artifactId>
            <version>RELEASE</version>
            <scope>compile</scope>
        </dependency>
    </dependencies>
</project>

5.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">
<!--设置spring编码过滤器-->
    <filter>
        <filter-name>CharacterEncodingFilter</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>
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>CharacterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <filter>
        <filter-name>HiddenHttpMethodFilter</filter-name>
        <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>HiddenHttpMethodFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <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:springmvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>SpringMVC</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

6.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: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 https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd">
<context:component-scan base-package="com.sunyu"></context:component-scan>
    <!-- 配置Thymeleaf视图解析器 -->
    <bean id="viewResolver" class="org.thymeleaf.spring5.view.ThymeleafViewResolver">
        <property name="order" value="1"/>
        <property name="characterEncoding" value="UTF-8"/>
        <property name="templateEngine">
            <bean class="org.thymeleaf.spring5.SpringTemplateEngine">
                <property name="templateResolver">
                    <bean class="org.thymeleaf.spring5.templateresolver.SpringResourceTemplateResolver">
                        <!-- 视图前缀 -->
                        <property name="prefix" value="/WEB-INF/templates/"/>
                        <!-- 视图后缀 -->
                        <property name="suffix" value=".html"/>
                        <property name="templateMode" value="HTML5"/>
                        <property name="characterEncoding" value="UTF-8" />
                    </bean>
                </property>
            </bean>
        </property>
    </bean>
    <mvc:default-servlet-handler />

    <!--开启mvc的注解驱动-->
    <mvc:annotation-driven />
<!--    <mvc:view-controller path="/" view-name="login"></mvc:view-controller>-->
    <mvc:view-controller path="/" view-name="index"></mvc:view-controller>
</beans>

7.前端

（1）实现添加功能

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>add employee</title>
    <link rel="stylesheet" th:href="@{/static/css/index_work.css}">
</head>
<body>
<form th:action="@{/employee}" method="post">
    <table>
        <tr>
            <th colspan="2">add employee</th>
        </tr>
        <tr>
            <td>lastName</td>
            <td>
                <input type="text" name="lastName">
            </td>
        </tr>
        <tr>
            <td>email</td>
            <td>
                <input type="text" name="email">
            </td>
        </tr>
        <tr>
            <td>gender</td>
            <td>
                <input type="radio" name="gender" value="1">male
                <input type="radio" name="gender" value="0">female
            </td>
        </tr>
        <tr>
            <td colspan="2">
                <input type="submit" value="add">
            </td>
        </tr>
    </table>
</form>
</body>
</html>

（2）实现修改与查询功能

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>update employee</title>
    <link rel="stylesheet" th:href="@{/static/css/index_work.css}">
</head>
<body>
<form th:action="@{/employee}" method="post">
    <input type="hidden" name="_method" value="put">
    <input type="hidden" name="id" th:value="${employee.id}">
    <table>
        <tr>
            <th colspan="2">update employee</th>
        </tr>
        <tr>
            <td>lastName</td>
            <td>
                <input type="text" name="lastName" th:value="${employee.lastName}">
            </td>
        </tr>
        <tr>
            <td>email</td>
            <td>
                <input type="text" name="email" th:value="${employee.email}">
            </td>
        </tr>
        <tr>
            <td>gender</td>
            <td>
                <input type="radio" name="gender" value="1" th:field="${employee.gender}">male
                <input type="radio" name="gender" value="0" th:field="${employee.gender}">female
            </td>
        </tr>
        <tr>
            <td colspan="2">
                <input type="submit" value="update">
            </td>
        </tr>
    </table>
</form>
</body>
</html>

（3）列表

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>employee list</title>
    <link rel="stylesheet" th:href="@{/static/css/index_work.css}">
</head>
<body>
<div id="app">
    <table>
        <tr>
            <th colspan="5">employee list</th>
        </tr>
        <tr>
            <th>id</th>
            <th>lastName</th>
            <th>email</th>
            <th>gender</th>
            <th>options（<a th:href="@{/to/add}">add</a>）</th>
        </tr>
        <tr th:each="employee : ${all}">
            <td th:text="${employee.id}"></td>
            <td th:text="${employee.lastName}"></td>
            <td th:text="${employee.email}"></td>
            <td th:text="${employee.gender}"></td>
            <td>
                <a @click="deleteEmployee()" th:href="@{'/employee/'+${employee.id}}">delete</a>
                <a th:href="@{'/employee/'+${employee.id}}">update</a>
            </td>
        </tr>
    </table>
    <form method="post">
        <input type="hidden" name="_method" value="delete">
    </form>
</div>

<script type="text/javascript" th:src="@{/static/js/vue.js}"></script>
<script type="text/javascript">
    var vue = new Vue({
        el:"#app",
        methods:{
            deleteEmployee(){
                //获取form表单
                var form = document.getElementsByTagName("form")[0];
                //将超链接的href属性值赋值给form表单的action属性
                //event.target表示当前触发事件的标签
                form.action = event.target.href;
                //表单提交
                form.submit();
                //阻止超链接的默认行为
                event.preventDefault();
            }
        }
    });
</script>
</body>
</html>

（4）跳转页面（稍后更新为登录）

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>欢迎来到员工信息管理系统</title>
</head>
<body>
<a th:href="@{/text}">跳转</a>
</body>
</html>

（5）css,javascrip等等文件

链接：https://pan.baidu.com/s/1npITDYYNffD9Yghi-3ni7A 
提取码：8pr2

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