SpringBoot的增删改查 全详细

实现的功能：显示全部数据、添加数据、修改数据、删除数据、根据id搜索和分页，下面是项目演示截图：

接下来就让我们进入主题

1.首先要检查maven是否配置

2.建立SpringBoot工程

选择Maven Project,填写包名、项目名称，finish

3.pom.xml的配置

<?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>2.2.2.RELEASE</version>
		<relativePath /> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.tedu.springboot</groupId>
	<artifactId>springboot</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>rest-service</name>
	<description>Demo project for Spring Boot</description>

	<properties>
		<java.version>1.8</java.version>
		<!-- maven的版本问题 编辑器的兼容问题 -->
		<maven-jar-plugin.version>3.1.1</maven-jar-plugin.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
    		<groupId>org.mybatis.spring.boot</groupId>
    		<artifactId>mybatis-spring-boot-starter</artifactId>
    		<version>1.3.2</version>
		</dependency>
		<dependency>
    		<groupId>mysql</groupId>
    		<artifactId>mysql-connector-java</artifactId>
    		<version>5.1.38</version>
		</dependency>
		<!-- 阿里巴巴连接池 -->
		<dependency>
    		<groupId>com.alibaba</groupId>
    		<artifactId>druid</artifactId>
    		<version>1.1.12</version>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-thymeleaf</artifactId>
		</dependency>
		<!-- 分页插件 -->
		<dependency>
		    <groupId>com.github.pagehelper</groupId>
		    <artifactId>pagehelper-spring-boot-starter</artifactId>
		    <version>1.2.10</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>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

</project>

如果项目有报错，选中项目右键找到Maven选择Update Project…,把Force Update of Snapshots/Releases选中，点击OK，等他更新完就好了

4.在src/main/resources创建配置文件

application.yml

server:
   port: 8888
spring:
   datasource:
      driver-class-name: com.mysql.jdbc.Driver
      url: jdbc:mysql://localhost:3306/springboot
      username: root
      password: 123456
      type: com.alibaba.druid.pool.DruidDataSource
   thymeleaf:
    cache: false #关闭缓存
    mode: HTML5 #设置模板类型
    encoding: utf-8  #设置编码
    suffix: .html
pagehelper: #pagehelper分页插件配置
     helperDialect: mysql
     reasonable: true
     supportMethodsArguments: true
     params: count=countSqll

5.数据库的设计

6.工程目录

7.代码部分

UserBean.java

package com.kang.bean;

import java.io.Serializable;

//@AllArgsConstructor//全参数构造
public class UserBean implements Serializable{
	private int id;//主键是不参与构造的
	private String name;
	private String pwd;
	private String email;
	private int age;
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getPwd() {
		return pwd;
	}
	public void setPwd(String pwd) {
		this.pwd = pwd;
	}
	public String getEmail() {
		return email;
	}
	public void setEmail(String email) {
		this.email = email;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	@Override
	public String toString() {
		return "UserBean [id=" + id + ", name=" + name + ", pwd=" + pwd + ", email=" + email + ", age=" + age + "]";
	}
}

UserMapper.java

package com.kang.mapper;
import java.util.List;

import com.kang.bean.UserBean;

public interface UserMapper {
	public int addUser(UserBean userBean);
		
	public int updateUser(UserBean userBean);
	
	public int deleteUser(int id);
	
	public List<UserBean> findAll();
	
	public UserBean findOneByid(int id);
}

UserMapper.xml

<mapper namespace="com.kang.mapper.UserMapper">
  <select id="findAll" resultType="com.kang.bean.UserBean">
    select * from user 
  select>
  <select id="findOneByid" resultType="com.kang.bean.UserBean" parameterType="int">
  	select * from user where id=#{id}
  select>
  
  <insert id="addUser" parameterType="com.kang.bean.UserBean" >
  	insert into user() value(#{id},#{name},#{pwd},#{email},#{age})
  insert>
  <update id="updateUser" parameterType="com.kang.bean.UserBean">
  	update user set name=#{name},pwd=#{pwd},email=#{email},age=#{age} where id=#{id}
  update>
  <delete id="deleteUser" parameterType="com.kang.bean.UserBean">
  	delete from user where id=#{id}
  delete>
mapper>

UserService.java

package com.kang.service;

import java.util.List;

import com.kang.bean.UserBean;

public interface UserService {
//	查询全部
	List<UserBean> findAll();
//	添加数据
	int addUser(UserBean userBean);
//	删除数据
	Integer deleteUser(int id);
//	修改需要先查询出来对象数据，显示然后进行数据提交，依据id唯一进行修改
	int updateUser(UserBean userBean);
//	查询对象
	UserBean fingOne(int id);
}

UserServiceImpl.java

package com.kang.service;

import java.util.List;

import javax.annotation.Resource;

import org.springframework.stereotype.Service;

import com.kang.bean.UserBean;
import com.kang.mapper.UserMapper;

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

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

	@Override
	public int addUser(UserBean userBean) {
		return userMapper.addUser(userBean);
	}

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

	@Override
	public int updateUser(UserBean userBean) {
		return userMapper.updateUser(userBean);
	}

	@Override
	public UserBean fingOne(int id) {
		return userMapper.findOneByid(id);
	}
}

UserController.java

package com.kang.controller;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;

import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.kang.bean.UserBean;
import com.kang.service.UserService;

@Controller // +@ResponseBody=@RestController
// @RestController//这个类下所有的都返回json格式
public class UserController {
	// 注入
	// @Autowired
	@Resource
	private UserService userService;

	@RequestMapping("/user/login")
	public ModelAndView login(ModelAndView mv, @RequestParam(defaultValue = "1", value = "pageNum") Integer pageNum) {
		if (pageNum < 1 || pageNum == null) {
			pageNum = 1;
		}
		PageHelper.startPage(pageNum, 5);
		List<UserBean> list = userService.findAll();
		PageInfo<UserBean> pageInfo = new PageInfo<UserBean>(list);
		mv.addObject("pageInfo", pageInfo);
		mv.setViewName("list");
		return mv;
	}

	@PostMapping("/user/add")
	// @ResponseBody
	public String add(UserBean userBean, HttpServletResponse servletResponse) throws IOException {
		int addUser = userService.addUser(userBean);
		if (addUser == 1) {
			servletResponse.sendRedirect("/user/login");
		}
		return "error";
	}

	@RequestMapping("/user/useradd")
	public String add() {
		return "add";
	}

	// 删除数据
	@RequestMapping("/user/deleteUser")
	public String deleteUser(@RequestParam Integer id, HttpServletResponse servletResponse) throws IOException {
		int count = userService.deleteUser(id);
		System.out.println("1111111");
		if (count == 1) {
			servletResponse.sendRedirect("/user/login");
		}
		return "error";
	}

	// 更新数据
	@RequestMapping("/user/updateName")
	public ModelAndView updateName(ModelAndView mv, int id) {
		UserBean findOne = userService.fingOne(id);
		mv.addObject("users", findOne);
		mv.setViewName("update");
		return mv;
	}

	@PostMapping("/user/userUpdate")
	public String updateUser(UserBean userBean, HttpServletResponse servletResponse) throws IOException {
		int userUpdate = userService.updateUser(userBean);
		if (userUpdate == 1) {
			servletResponse.sendRedirect("/user/login");
		}
		return "error";
	}

	// 根据id查找
	@PostMapping("/user/updatePage")
	public ModelAndView updatePage(int id, ModelAndView mv,
			@RequestParam(defaultValue = "1", value = "pageNum") Integer pageNum) {
		UserBean users = userService.fingOne(id);
		if (pageNum < 1 || pageNum == null) {
			pageNum = 1;
		}
		PageHelper.startPage(pageNum, 5);
		List<UserBean> list = new ArrayList<>();
		list.add(users);
		PageInfo<UserBean> pageInfo = new PageInfo<UserBean>(list);
		mv.addObject("pageInfo", pageInfo);
		mv.setViewName("list");
		return mv;
	}
}

7.页面部分

在src/main/resources下创建文件夹template，以存放页面

list.html

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

<style>
p a {
	background-color: white;
}

h2 {
	text-align: center;
}

.search_form {
	width: 602px;
	height: 42px;
}

/*左边输入框设置样式*/
.input_text {
	width: 200px;
	height: 30px;
	border: 1px solid green;
	/*清除掉默认的padding*/
	padding: 0px;
	/*提示字首行缩进*/
	text-indent: 10px;
	/*去掉蓝色高亮框*/
	outline: none;
	/*用浮动解决内联元素错位及小间距的问题*/
	float: left;
}

.input_sub {
	width: 70px;
	height: 30px;
	background: green;
	/*去掉submit按钮默认边框*/
	border: 0px;
	float: left;
	color: white; /*搜索的字体颜色为白色*/
	cursor: pointer; /*鼠标变为小手*/
}
style>

<body>
	<h2>SpringBoot-CURDh2>
	<form class="search_form" th:action="@{/user/updatePage}" method="post">
		<input type="text" class="input_text" placeholder="请输入id搜索" name="id">
		<input type="submit" value="搜索" class="input_sub">
	form>

	<table
		class="table table-striped table-bordered table-hover text-center">
		<thead>
			<tr style="text-align: center">
				<th>idth>
				<th>nameth>
				<th>pwdth>
				<th>emailth>
				<th>ageth>
				<th>operationth>
			tr>
		thead>

		<tr th:each="user:${pageInfo.list}">
			<td th:text="${user.id}">td>
			<td th:text="${user.name}">td>
			<td th:text="${user.pwd}">td>
			<td th:text="${user.email}">td>
			<td th:text="${user.age}">td>
			<td><a class="btn btn-primary"
				th:href="@{/user/updateName(id=${user.id})}">更改a> <a
				class="btn btn-danger"
				th:href="@{'/user/deleteUser?id='+${user.id}}">删除a>td>
		tr>
	table>

	<p>
		当前 <span th:text="${pageInfo.pageNum}">span> 页,总 <span
			th:text="${pageInfo.pages}">span> 页,共 <span
			th:text="${pageInfo.total}">span> 条记录
	     
	<a th:href="@{/user/login(pageNum=1)}">首页a>  
	<a th:href="@{/user/login(pageNum=${pageInfo.pageNum}-1)}">上一页a>  
	<a th:href="@{/user/login(pageNum=${pageInfo.pageNum}+1)}">下一页a>  
	<a th:href="@{/user/login(pageNum=${pageInfo.pages})}">尾页a>
	p>

	<button class="btn btn-block">
		<a href="/user/useradd">添加用户a>
	button>

body>

html>

update.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="/user/userUpdate" method="post">
    ID：<input class="form-control" name="id" type="text" th:value="${users.id}" readonly="readonly"><br>
        用户名：<input class="form-control" type="text" th:value="${users.name}" name="name"><br>
        密 码：<input class="form-control" type="text" th:value="${users.pwd}" name="pwd"><br>
    email：<input class="form-control" type="text" th:value="${users.email}" name="email"><br>
        年龄：<input class="form-control" type="text" th:value="${users.age}" name="age"><br>
        <button class="btn btn-primary btn-lg btn-block" type="submit">提交button>
    form>
div>
body>
html>

add.xml

<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="/user/add" method="post">
        用户名：<input class="form-control" type="text" th:value="${name}" name="name"><br>
        密 码：<input class="form-control" type="text" th:value="${pwd}" name="pwd"><br>
    email：<input class="form-control" type="text" th:value="${email}" name="email"><br>
        年龄：<input class="form-control" type="text" th:value="${age}" name="age"><br>
        <button class="btn btn-primary btn-lg btn-block">保存button>
    form>
div>
body>
html>

8.运行

SpringBootMain.java 启动类

package com.kang;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan("com.kang.mapper")
public class SpringBootMain {
//启动类
	public static void main(String[] args) {
		SpringApplication.run(SpringBootMain.class, args);
	}
}

浏览器中输入http://localhost:8888/user/login

感谢浏览，欢迎指教和交流