Hutool Java 工具类库导出 Excel，2步搞定！

前言

<dependency>
    <groupId>cn.hutool</groupId>
    <artifactId>hutool-all</artifactId>
    <version>5.0.7</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>

@RequestMapping("/export")
@ResponseBody
public void export(HttpServletResponse response){
 List<User> list = new ArrayList<>();
 list.add(new User("zhangsan","1231",new Date()));
 list.add(new User("zhangsan1","1232",new Date()));
 list.add(new User("zhangsan2","1233",new Date()));
 list.add(new User("zhangsan3","1234",new Date()));
 list.add(new User("zhangsan4","1235",new Date()));
 list.add(new User("zhangsan5","1236", DateUtil.date(new Date())));
 // 通过工具类创建writer，默认创建xls格式
 ExcelWriter writer = ExcelUtil.getWriter();
 //自定义标题别名
 writer.addHeaderAlias("name", "姓名");
 writer.addHeaderAlias("age", "年龄");
 writer.addHeaderAlias("birthDay", "生日");
 // 合并单元格后的标题行，使用默认标题样式
 writer.merge(2, "申请人员信息");
 // 一次性写出内容，使用默认样式，强制输出标题
 writer.write(list, true);
 //out为OutputStream，需要写出到的目标流
 //response为HttpServletResponse对象
 response.setContentType("application/vnd.ms-excel;charset=utf-8");
 //test.xls是弹出下载对话框的文件名，不能为中文，中文请自行编码
 String name = StringUtils.toUtf8String("申请学院");
 response.setHeader("Content-Disposition","attachment;filename="+name+".xls");
 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();
 }
 //此处记得关闭输出Servlet流
 IoUtil.close(out);
}