idea利用spring框架整合thymeleaf展现数据库数据

上一篇文章简单展现自己写的列表；

这篇文章连接mysql数据库实现数据库数据展现

主要三个文件

controller指定html界面

package com.example.appledemo.controller;

import com.example.appledemo.mapper.UserMapper;
import com.example.appledemo.pojo.User;
import jakarta.annotation.Resource;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.ui.Model;

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

@Controller
public class TestController {
    @Resource
    UserMapper userMapper;

    @RequestMapping("/login")
    public String login(Model model){
        List<User> user = userMapper.findAll();
        model.addAttribute("user",user);
        return "login";
    }
}

mapper写数据库sql查询语句

package com.example.appledemo.mapper;

import com.example.appledemo.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;

import java.util.List;

@Mapper
public interface UserMapper {
    @Select("SELECT * FROM user")
    List<User> findAll();
}

pojo中的user写具体数据库中的表包含哪些字段（这部分最好的方式写出变量名字然后alt+insert自动生成getter和setter不容易出错）

package com.example.appledemo.pojo;

import lombok.Getter;

@Getter
public class User {
    private Integer userId;
    private String userName;
    private String userPass;

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public void setUserPass(String userPass) {
        this.userPass = userPass;
    }

    public void setUserId(Integer userId) {
        this.userId = userId;
    }

    @Override
    public String toString() {
        return "User{" +
                "userId=" + userId +
                ", userName='" + userName + '\'' +
                ", userPass='" + userPass + '\'' +
                '}';
    }
}

最后写个login.html展现数据

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>springboot-thymeleaf demo</title>
</head>
<body>
<table border="1" width="1000">
    <tr th:each="item,eee: ${user}">
        <td th:text="${item.userId}"></td>
        <td th:text="${item.userName}"></td>
        <td th:text="${item.userPass}"></td>
    </tr>
</table>
</body>
</html>
</html>

给出文件列表：

最后给出运行结果：