基于Hutool封装的Excel导出工具类
官网地址：https://www.hutool.cn/docs/#/poi/Excel%E7%94%9F%E6%88%90-ExcelWriter
以前导出用的是poi，但是我发现hutool已经对poi进行了很好的封装，那么我们也可以在他的基础上进行二次封装，来达到我们的需求。下面是效果图
这是是只有一级表头
这个是二级表头
那么接下来直接上我们自己封装的工具类：
import cn.hutool.core.io.IoUtil;
import cn.hutool.poi.excel.ExcelUtil;
import cn.hutool.poi.excel.ExcelWriter;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* @description: Excel 工具
* @author: Lxq
* @date: 2020/7/16 10:06
*/
public class ExcelUtils {
/**
* 导出Excel
*
* @param response
* @param list 数据
* @param headerAlias 表头
*/
public static void exportExcel(HttpServletResponse response, List list, Map headerAlias) {
// 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
headerAlias.forEach(
(k, v) -> {
writer.addHeaderAlias(k, v);
}
);
// 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
response.setHeader("Content-Disposition", "attachment;filename=" + "xxx" + ".xls");
ServletOutputStream out = null;
getServletOutputStream(response, writer, out);
}
/**
* @param response
* @param list 数据
* @param headerAlias 表头
*/
public static void exportExcel(HttpServletResponse response, List list, List> headerAlias) {
ExcelWriter writer = ExcelUtil.getWriter();
// 这个方法使用二级表头，那么直接先添加一行
writer.passCurrentRow();
int[] firstColumn = {0};
int[] lastColumn = {0};
Boolean[] flag = {true};
List> sHead = new ArrayList<>();
headerAlias.stream().forEach(
l -> {
String headNmae = (String) l.get("headName");
Map content = (Map) l.get("children");
content.forEach(
(k, v) -> {
Map head = new HashMap<>();
head.put(k, (String) v);
sHead.add(head);
}
);
lastColumn[0] += content.size();
if (flag[0] == true) {
// 开始时候下标从零开始
lastColumn[0] -= 1;
flag[0] = false;
}
writer.merge(0, 0, firstColumn[0], lastColumn[0], headNmae, true);
firstColumn[0] += content.size();
}
);
sHead.stream().forEach(
h -> {
h.forEach(
(k, v) -> writer.addHeaderAlias(k, v)
);
}
);
// 一次性写出内容，使用默认样式，强制输出标题
writer.write(list, true);
//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
response.setHeader("Content-Disposition", "attachment;filename=" + "xxx" + ".xls");
ServletOutputStream out = null;
getServletOutputStream(response, writer, out);
}
private static void getServletOutputStream(HttpServletResponse response, ExcelWriter writer, ServletOutputStream out) {
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);
}
}
}
那么我们应该传什么数据，才能生成这样的效果呢？
/**
* @description:
* @author: Lxq
* @date: 2020/7/16 11:03
*/
@RestController
@RequestMapping("/test")
public class LocalVariable {
@GetMapping("/export")
public void testExport(HttpServletResponse response) {
// ======================数据 ===============================
List> list = new ArrayList<>();
Map map = new HashMap<>();
map.put("name", "xiaoming");
map.put("age", "11");
map.put("score", "60");
map.put("isPass", "是");
map.put("examDate", "2020-8-1");
list.add(map);
// ===================== 二级表头================================
List> headerAlias = new ArrayList<>();
Map head1 = new LinkedHashMap<>();
head1.put("headName", "我是一级表头head1");
Map son1 = new LinkedHashMap<>();
son1.put("name", "姓名");
son1.put("age", "年龄");
head1.put("children", son1);
headerAlias.add(head1);
Map head2 = new LinkedHashMap<>();
head2.put("headName", "我是一级表头head2");
Map son2 = new LinkedHashMap<>();
son2.put("score", "分数");
son2.put("isPass", "是否通过");
son2.put("examDate", "考试时间");
head2.put("children", son2);
headerAlias.add(head2);
ExcelUtils.exportExcel(response, list, headerAlias);
}
@GetMapping("/export2")
public void test2Export(HttpServletResponse response) {
// ======================数据 ===============================
List> list = new ArrayList<>();
Map map = new HashMap<>();
map.put("name", "xiaoming");
map.put("age", "11");
map.put("score", "60");
map.put("isPass", "是");
map.put("examDate", "2020-8-1");
list.add(map);
// ===================== 一级表头================================
Map head = new LinkedHashMap<>();
head.put("name", "姓名");
head.put("age", "年龄");
head.put("score", "分数");
head.put("isPass", "是否通过");
head.put("examDate", "考试时间");
ExcelUtils.exportExcel(response, list, head);
}
这是测试数据，需要的小伙伴们用起来，好用记得帮忙点赞，谢谢你们。