springboot实现导出数据库数据

原创已于 2022-07-30 18:18:29 修改 · 1.8k 阅读

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#spring boot #数据库 #java

于 2022-07-30 18:18:12 首次发布

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本文介绍了如何使用Spring Boot、MyBatis和Hutool库将数据库中的用户信息导出为Excel文件，包括实体类定义、Mapper接口配置及Controller中的具体操作步骤。

springboot实现导出数据库数据

先看数据库数据（主键自增，时间自动填充当前时间）

在这里插入图片描述

一、导入依赖

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.22</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.2.2</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.28</version>
        </dependency>
        
        <--导入hutool-->
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.7.18</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>4.1.2</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

二、实体类

import java.util.Date;
@Data
@NoArgsConstructor
@AllArgsConstructor
public class User {
    private Integer id;
    private String username;
    private String password;
    private String nickname;
    private String email;
    private String phone;
    private String address;
    private Date createTime;
    private String avatarUrl;
}

三、UserMapper 和UserMapper.xml

import java.util.List;
@Mapper
@Repository
public interface UserMapper {
    List<User> list();
}

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.example.filedemo.mapper.UserMapper">

<select id="list" resultType="user">
    select  * from sys_user
</select>

</mapper>

四、controller

  @Autowired
    private UserMapper userMapper;

    @GetMapping("/export")
    public void export(HttpServletResponse response) throws Exception{
        List<User> list = userMapper.list();
        ExcelWriter writer= ExcelUtil.getWriter(true);

        writer.addHeaderAlias("username","用户名");
        writer.addHeaderAlias("password","密码");
        writer.addHeaderAlias("nickname","昵称");
        writer.addHeaderAlias("email","邮箱");
        writer.addHeaderAlias("phone","电话");
        writer.addHeaderAlias("address","地址");
        writer.addHeaderAlias("createTime","创建时间");
        writer.addHeaderAlias("avatarUrl","头像");
        writer.write(list,true);
        response.setContentType("application/vnd.openxmlfromates-officedocument.spreadsheetml.sheet;charset=utf-8");
        String fileName = URLEncoder.encode("用户信息", "UTF-8");
        response.setHeader("Content-Disposition","attachment;filename="+fileName+ ".xlsx");

        ServletOutputStream out = response.getOutputStream();
        writer.flush(out,true);
        out.close();
        writer.close();
    }