Springboot实现导出Excel

一、添加依赖

        <!-- excel配置依赖 -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>4.1.2</version>
        </dependency>
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.7.20</version>
        </dependency>
        
        <!-- JSON工具类 用于解析时间 -->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.12.6</version>
        </dependency>

二、controller中

@GetMapping("/export")
    public void export(HttpServletResponse response) throws IOException {

//        ArrayList<User> list = new ArrayList<>();
        List<User> list = userMapper.getAllUser();
//        ExcelUtil.getWriter(filesUploadPath+"/用户信息.xlsx");
        ExcelWriter writer = ExcelUtil.getWriter(true);
        //自定义标题别名
        writer.addHeaderAlias("username","用户名");
        writer.addHeaderAlias("password","密码");
        writer.addHeaderAlias("nickname","昵称");
        writer.addHeaderAlias("email","邮箱");
        writer.addHeaderAlias("phone","手机");
        writer.addHeaderAlias("username","地址");
        writer.addHeaderAlias("creatTime","创建时间");
        writer.addHeaderAlias("avater","头像");

        //一次性写入list内的对象到excel，使用默认样式,强制输出标题
        writer.write(list,true);
        response.setContentType("application/vnd.ms-excel;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();


    }

三、运行浏览器输入对应接口

http://localhost:8081/user/export