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SpringBoot + bootstrap 配合 mysql 实现增删改查功能
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创建项目
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打开 idea 工具 ---- 点击 File --- new --- Project 创建springBoot 项目工程,
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版本统一: 我使用的 mysql5.7 maven3.6.3 jdk1.8 idea2021.2
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进行 添加jar包配置
创建Springboot 工程好后,可以查看一下pom.xml 配置文件
<?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> <!-- <dependency>--> <!-- <groupId>org.apache.tomcat.embed</groupId>--> <!-- <artifactId>tomcat-embed-core</artifactId>--> <!-- <version>9.0.62</version>--> <!-- </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>
- 完成pom.xml 后,下面我们创建mysql数据库
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CREATE TABLE `user` ( `id` int(10) NOT NULL AUTO_INCREMENT COMMENT 'id', `username` varchar(255) DEFAULT NULL COMMENT '姓名', `password` varchar(255) DEFAULT NULL COMMENT '密码', PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=8 DEFAULT CHARSET=utf8mb4;
可以手动创建一条数据先完成数据库后,先给大家看一下我的整体实现增删改查的包
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下面我们创建一个实体类,pojo ----- User.java
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package com.csq.csqtest.pojo; 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 + '\'' + '}'; } }
创建方法接口 service --- UserService
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package com.csq.csqtest.service; 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); // //根据姓名查询 // User get(String username); }
实现方法 impl ---- UserServiceImpl.java
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package com.csq.csqtest.service.impl; 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 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 User get(String username) { // return userMapper.get(username); // } @Override public int update(User user) { return userMapper.update(user); } }
创建mapper --- UserMapper.java
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package com.csq.csqtest.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); //根据username查询 // @Select("select * from user where id=#{id}") // public User get(String username); //更新数据 @Update("update user set username=#{username},password=#{password} where id=#{id}") public int update(User user); }
创建controller ---- UserControl.java
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package com.csq.csqtest.controller; 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; //查询全部,在mvc中model层就是dao层,在java中无特殊含义就是模块 @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); return "redirect:/index.html"; } //删除数据, @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,需要先获得该id对应的值,所以需要get请求 @GetMapping("/updatePage/{id}") public String updatePage(Model model, @PathVariable int id) { User users = userService.get(id); model.addAttribute("users", users); 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"; } //根据id查询 @RequestMapping("/get") public String get(Model model, int id) { User users = userService.get(id); model.addAttribute("users", users); return "index"; } // @RequestMapping("/getusername") // public String get(Model model, String username) { // User users = userService.get(username); // model.addAttribute("users", users); // return "index"; // } }
接下来实现配置application.yml
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spring: web: resources: static-locations: classpath:/static/,classpath:/templates/ datasource: type: com.alibaba.druid.pool.DruidDataSource url: jdbc:mysql://localhost:3306/zls?useSSL=false&useUnicode=true&characterEncoding=utf-8 username: root //账号 password: 123456 //密码 driver-class-name: com.mysql.cj.jdbc.Driver 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 server: port: 8082 //端口号
然后访问:
空白是因为数据库没有数据,访问成功。
下面开始填写前端,调用前端框架:
bootstrap
在 templates 里面创建一个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; } th{ text-align: center; } </style> <body> <div> <h1 style="color: darkcyan">信息系统管理</h1> <!-- <p style="text-align: center">--> <!-- <button class="btn btn-primary">搜索</button>--> <!-- <input type="text" style="width: 300px; height: 33px; /">--> <!-- </p>--> <form action="/get" method="post"> 输入编号:<input class="form-control" type="text" th:value="${#ids}" name="id"><br> <button class="btn btn-primary btn-lg btn-block">查询</button> </form> <!-- <form action="/getusername" method="post">--> <!-- 输入姓名:<input class="form-control" type="text" th:value="${#uris}" name="username"><br>--> <!-- <button class="btn btn-primary btn-lg btn-block">查询</button>--> <!-- </form>--> </div> <!--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> <a href="/add.html"> <input type="button" value="添加用户" class="btn btn-block" style="color: cadetblue; background-color: lightblue"/></a> <!--<button class="btn btn-block" style="color: cadetblue; background-color: lightblue"><a href="/add.html">添加用户</a></button>--> </body> </html>
记住,数据库一定要有数据,现在开始访问, 成功访问 :
注意自己的端口号访问的时候:
下面开始实现提交功能--- 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:<!--/*@thymesVar id="password" type=""*/--> <input class="form-control" type="text" th:value="${username}" name="username"><br> 密 码:<!--/*@thymesVar id="password" type="ch"*/--> <input class="form-control" type="text" th:value="${password}" name="password"><br> <button class="btn btn-primary btn-lg btn-block">保存</button> </form> </div> </body> </html>
开始进行访问测试有没有成功::
访问成功,添加数据成功
下面进行修改数据:::
<!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"> <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>
成功::
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标签:username,Springboot,bootstrap,改查,id,User,import,public,String From: https://www.cnblogs.com/zengxiangcai/p/16839124.html