java动态导出阿里EasyExcel本地或浏览器

官方文档

https://www.yuque.com/easyexcel/doc/easyexcel

先导入阿里EasyExcel的maven

<dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>easyexcel</artifactId>
            <version>2.2.6</version>
        </dependency>

导入工具类

1.导出到本地的工具类和测试类

1.1下载到本地的工具类

//参数说明
 private final static String fileName1 = "D:\" + System.currentTimeMillis() + ".xlsx";
public static void easyUtil(List<String> heads,String head,List<Map<String, Object>> list){
          
   

    	//设置表头和标题
        List<List<String>> hs = new ArrayList<>();
        for (String s : heads) {
          
   
            hs.add(Arrays.asList(head,s));
        }
        Collection<Object> values;
        List<List<Object>> list2 = new ArrayList<>();

   		 //取出map的值,转换为list
        for (int i = 0; i < list.size(); i++) {
          
   

            List<Object> objects = new ArrayList<>();
            values = list.get(i).values();
            for (Object value : values) {
          
   
                objects.add(value.toString());
            }
            list2.add(objects);
        }
    //核心代码
        EasyExcel.write(fileName1).head(hs).sheet("模板（sheet名字）").doWrite(list2);
    }

解析:EasyExcel.write(fileName1).head(hs).sheet(“模板（sheet名字）”).doWrite(list2);

write(fileName1)文件下载到的地方,

.head(hs)设置文件头

sheet(“模板（sheet名字）”) 设置表名

doWrite(list2); 需要写入的数据

1.2测试类

public static void main(String[] args) {
          
   
        List<String> heads = new ArrayList<>();		//表头信息
        heads.add("银行名称");
        heads.add("期间新增项目");
        heads.add("期间新增担保总额");
        heads.add("期间新增解保项目数");
        heads.add("期间新增解保金额");
        heads.add("在保项目数");
        heads.add("在保余额");
        heads.add("银行利率");
        String head="惠农通数据表";			//主表头
        List<Map<String, Object>> list = new ArrayList<>();
        Map<String,Object> test = new LinkedHashMap<>();		//手动添加测试数据（可根据需要从数据库查询）
        test.put("t1", 1);
        test.put("t2", 2);
        test.put("t3", 3);
        test.put("t4", 4);
        test.put("t5", 5);
        test.put("t6", 6);
        test.put("t7", 7);
        test.put("t8", 8);
        list.add(test);
        Map<String,Object> test2 = new LinkedHashMap<>();
        test.put("t1", 1);
        test.put("t2", 2);
        test.put("t3", 3);
        test.put("t4", 4);
        test.put("t5", 5);
        test.put("t6", 6);
        test.put("t7", 7);
        test.put("t8", 8);
        list.add(test2);
        easyUtil(heads,head,list);
    }

2.导出到浏览器

2.1工具类

/**
     * 
     * @param response 
     * @param heads 表头
     * @param head 标题
     * @param list 数据
     * @return
     * @throws IOException
     */
    public static void easyUtil1(HttpServletResponse response,List<String> heads, String head, List<List<Object>> list) throws IOException {
          
   

		//整合表头和标题
        List<List<String>> hs = new ArrayList<>();
        for (String s : heads) {
          
   
            hs.add(Arrays.asList(head,s));
        }
        //设置表名
        String fileName = new String((new SimpleDateFormat("yyyy-MM-dd").format(new Date())).getBytes(), "UTF-8");
       	//设置字符编码
       response.setCharacterEncoding("utf-8");
       //设置内容类型
       response.setContentType("application/vnd.ms-excel");
        //设置标题
        response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName + ".xlsx", "utf-8"));
		//核心代码
        EasyExcel.write(response.getOutputStream()).head(hs).sheet("员工考勤").doWrite(list);
    }

主要的就是工具类里的一行核心代码,其他的都很灵活.