java 生成Excel文件导出

Posted 2022-10-15 派大星敲代码

Hutool工具类中有关于excel导出的工具类，非常好用

第一步，我们先导入依赖

<dependency>
    <groupId>cn.hutool</groupId>
    <artifactId>hutool-all</artifactId>
    <version>5.2.4</version>
</dependency>

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>4.1.1</version>
</dependency>

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml-schemas</artifactId>
    <version>3.17</version>
</dependency>

第二步，直接上导出方法

/**
 * 导出excel
 * @param response
 */
public void daochu(HttpServletResponse response) throws UnsupportedEncodingException 
    //这里我们定义一下需要导出的数据
    List<TbProducts> tbProducts = new ArrayList<TbProducts>()
        add(new TbProducts(1,"牛奶","6.50","500ml"));
        add(new TbProducts(2,"可乐","3.50","650ml"));
        add(new TbProducts(3,"咖啡","7.50","500ml"));
        add(new TbProducts(4,"啤酒","9.50","500ml"));
    ;

    //使用工具类创建writer,默认的是xls
    ExcelWriter writer = ExcelUtil.getWriter();
    //自定义别名，给数据字段起一个别名
    writer.addHeaderAlias("id","商品编号");
    writer.addHeaderAlias("productName","商品名称");
    writer.addHeaderAlias("price","商品价格");
    writer.addHeaderAlias("page","商品规格");
    //设置标题,并且合并单元格
    writer.merge(3,"商品信息");
    //写入内容
    writer.write(tbProducts,true);

    //设置编码不然中文会乱码
    response.setContentType("application/vnd.ms-excel;charset=utf-8");

    //filename=() 设置文件名
    response.setHeader("Content-Disposition","attachment;filename="+new String("商品表".getBytes("utf-8"),"ISO-8859-1")+".xls");

    //把目标写入流
    ServletOutputStream out= null;
    try 
        out = response.getOutputStream();
        writer.flush(out, true);
     catch (IOException e) 
        e.printStackTrace();
    finally 
        // 关闭writer，释放内存
        writer.close();
    
    IoUtil.close(out);

提醒一下不要用postman测试效果

不然中文名就变成response了，还是把post请求换成get在浏览器请求，就不会出现中文名默认成response这种小坑了

感谢阅读！