Spring boot 实现增删改 springboot简单的增删改查项目

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小题大作 2023-10-08 09:08:14

文章标签 Spring boot 实现增删改前端 restful bootstrap User 文章分类 spring boot 后端开发

由于网页端无法完成post之类的请求，所以增加需要手动增加,这个页面只能进行更改和删除，而且将源码中的端口号改为了8082，在访问网址的时候请注意一下

Spring boot 实现增删改 springboot简单的增删改查项目_前端

点击更改按钮

Spring boot 实现增删改 springboot简单的增删改查项目_前端_02

更改完毕后会继续回到index,html界面。点击删除按钮就直接删除所选信息。

创建SpringBoot项目

Spring boot 实现增删改 springboot简单的增删改查项目_User_03

项目目录

Spring boot 实现增删改 springboot简单的增删改查项目_Spring boot 实现增删改_04

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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.6.2</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.csq</groupId>
    <artifactId>csqtest</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>csqtest</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
<!-- mybatis -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.2.1</version>
        </dependency>

<!--        mysql连接器-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

<!--阿里数据源-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.9</version>
        </dependency>

        <!--        获取页面session对象request对象response对象 HttpServletXXX jar包-->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.0.1</version>
        </dependency>

        <!--        json转换工具包-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.47</version>
        </dependency>


        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <!--热部署-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
            <scope>runtime</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
    </dependencies>



    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <!-- 如果不配置fork，devtools就不会起作用,devtools是前端开发工具-->
                    <fork>true</fork>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

application.yml文件

spring:
  web:
    resources:
      static-locations: classpath:/static/,classpath:/templates/
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    url:地址
    username: 账号
    password: 密码
    driver-class-name: com.mysql.cj.jdbc.Driver
    #普通浏览器只能get和post请求，
    #所以如果需要其他的请求方式，需要这个，然后隐藏起来
  mvc:
    hiddenmethod:
      filter:
        enabled: true
  devtools:
    restart:
      enabled: true #设置开启热部署
  freemarker:
    cache: false #页面不加载缓存，修改即使生效
mybatis:
  configuration:
    map-underscore-to-camel-case: true #下划线驼峰设置
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl   # 打印SQL语句

user表

Spring boot 实现增删改 springboot简单的增删改查项目_bootstrap_05

User实体类

public class User {
    private Integer id;
    private String username;
    private String password;

    public Integer getId() {
        return id;
    }

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

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public User(Integer id,String username,String password) {
        this.id=id;
        this.username=username;
        this.password=password;
    }
    public User() {

    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

Dao层（也就是mapper）

import com.csq.csqtest.pojo.User;
import org.apache.ibatis.annotations.*;

import java.util.List;

@Mapper
public interface UserMapper {
    //查询全部
    @Select("select * from user")
    List<User> findAll();

    //新增数据
    @Insert("insert into user (username,password) values (#{username},#{password})")
    public int save(User user);

    //删除数据
    @Delete("delete from user where id=#{id}")
    public int delete(int id);

    //根据id查找
    @Select("select * from user where id=#{id}")
    public User get(int id);

    //更新数据
    @Update("update user set username=#{username},password=#{password} where id=#{id}")
    public int update(User user);

}

Service层

Service接口

import com.csq.csqtest.pojo.User;
import java.util.List;
public interface UserService {
    //查询全部
    List<User> findAll();
    //新增数据
    int save(User user);
    //删除数据
    Integer delete(int id);
    //根据id查找
    User get(int id);
    //更新数据
    int update(User user);
}

Service实现类

import com.csq.csqtest.mapper.UserMapper;
import com.csq.csqtest.pojo.User;
import com.csq.csqtest.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
import java.util.List;

@Service
public class UserServiceImpl implements UserService {
    @Autowired
    private UserMapper userMapper;


    @Override
    public List<User> findAll() {
        return userMapper.findAll();
    }

    @Override
    public int save(User user) {
        return userMapper.save(user);
    }

    @Override
    public Integer delete(int id) {
        return userMapper.delete(id);
    }

    @Override
    public User get(int id) {
        return userMapper.get(id);
    }

    @Override
    public int update(User user) {
        return userMapper.update(user);
    }
}

Controller层

import com.csq.csqtest.pojo.User;
import com.csq.csqtest.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;
import java.util.Map;

//控制层，导入Service层
@Controller
public class UserControl {
    @Autowired
    private UserService userService;

    
    @GetMapping("/index.html")
    public String userList(Map<String,List> result) {
        List<User> Users=userService.findAll();
        result.put("users",Users);
        return "index";
    }

    //新增数据
    @PostMapping("/add")
    public String save(User user) {
        userService.save(user);
        //表示重置index.html界面并且跳转到index.html界面
        return "redirect:/index.html";
    }

    //删除数据,本来需要使用DeleteMapping，但是由于没有界面可以隐藏，所以这里就直接写了RequestMapping
    @RequestMapping("/delete/{id}")
    public String delete(@PathVariable Integer id, HttpServletResponse servletResponse) throws IOException {
       userService.delete(id);
        System.out.println("delete方法执行");
        return "redirect:/index.html";
    }


    //根据id进行修改
    @GetMapping("/updatePage/{id}")
    public String updatePage(Model model,@PathVariable int id){
        User users = userService.get(id);
        model.addAttribute("users",users);
        //表示跳转到modifie,html界面
        return "modifie";
    }

    @PutMapping("/update")
    public String updateUser(Model model,User user,HttpServletRequest request) {
        String id = request.getParameter("id");
        User userById = userService.get(Integer.parseInt(id));
        userService.update(user);
        System.out.println(user);
        return "redirect:/index.html";
    }
}

add.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>添加用户</title>
    <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>

<body>

<div style="width:600px;height:100%;margin-left:270px;">
    <form action="/add" method="post">
<!--        form-control给input添加这个class后就会使用bootstrap自带的input框-->
        用户名：<input class="form-control" type="text" th:value="${username}" name="username"><br>
        <!--注意参数的拼接-->
        密 码：<input class="form-control" type="text" th:value="${password}" name="password"><br>
        <button class="btn btn-primary btn-lg btn-block">保存</button>
    </form>
</div>

</body>
</html>

index.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>用户列表</title>
    <!-- 引入 Bootstrap -->
    <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>

<style>
    a{
        color: #ffffff;
    }
    h1{
        /*文字对齐*/
        text-align: center;
    }
</style>

<body>
<h1>spring-boot</h1>
<!--table-striped:斑马线格式，table-bordered：带边框的表格，table-hover：鼠标悬停高亮的表格-->
<table class="table table-striped table-bordered table-hover text-center">
    <thead>
    <tr style="text-align:center">
<!--        th标签定义html表格中的表头单元格-->
        <th>编号</th>
        <th>姓名</th>
        <th>密码</th>
        <th>操作</th>
    </tr>
    </thead>
<!--tr标签定义html表格中的所有行-->
<!--    遍历集合，如果被遍历的变量users为null或者不存在，则不会进行遍历，也不会报错-->
    <tr th:each="user:${users}">
<!--        td标签定义html表格中的标准单元格-->
        <td th:text="${user.id}"></td>
        <td th:text="${user.username}"></td>
        <td th:text="${user.password}"></td>
        <td>
<!--         a标签用来定义超链接 href表示超链接-->
            <a class="btn btn-primary" th:href="@{'/updatePage/'+${user.id}}">更改</a>
            <a class="btn btn-danger" th:href="@{'/delete/'+${user.id}}">删除</a>
        </td>
    </tr>
</table>
<button class="btn btn-block" ><a href="/add.html">添加用户</a></button>

</body>

</html>

modifie.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>修改用户</title>
    <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>

<div style="width:600px;height:100%;margin-left:270px;">
    <form action="/update" method="post">
    <!-- rest风格中的更新是put请求，
    所以这块先使用post请求，然后隐藏起来改为put请求-->
        <input name="_method" type="hidden" value="put">
        ID：<input class="form-control"  type="text" th:value="${users.id}" name="id"><br>
        用户名：<input class="form-control" type="text" th:value="${users.username}" name="username"><br>
        密 码：<input class="form-control" type="text" th:value="${users.password}" name="password"><br>
        <button class="btn btn-primary btn-lg btn-block" type="submit">提交</button>
    </form>
</div>

</body>
</html>

都敲完以后运行起来，直接在网址那里填localhost:8080/index.html即可，随后点击更新会自动跳转到更新界面

源码链接
源码

建表语句

CREATE TABLE `user` (
  `id` int NOT NULL AUTO_INCREMENT,
  `username` varchar(50) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DEFAULT NULL,
  `password` varchar(50) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=50 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci

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