导入EasyExcel依赖

Gradle

implementation group: 'com.alibaba', name: 'easyexcel', version: '2.2.6'

Maven

<!-- https://mvnrepository.com/artifact/com.alibaba/easyexcel -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>easyexcel</artifactId>
    <version>2.2.6</version>
</dependency>

demo代码，拿来即用

java">//保存路径与名字
    private final static String fileName = "E:\\" + System.currentTimeMillis() + ".xlsx";
    @Test
//    public static void easyUtil(List<String> heads,String head,List<Map<String, Object>> list){
	  			
    public void easyUtil(){
        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);
        List<Object> objects = new ArrayList<>();
        List<List<String>> hs = new ArrayList<>();
        for (String s : heads) {
            hs.add(Arrays.asList(head,s));
        }
//        List<Map<String, Object>> l = new ArrayList<>();
        Collection<Object> values;
        List<List<Object>> list2 = new ArrayList<>();

        for (int i = 0; i < list.size(); i++) {

            values = list.get(i).values();
            for (Object value : values) {
                objects.add(value.toString());
            }
            list2.add(objects);
        }
        EasyExcel.write(fileName).head(hs).sheet("模板").doWrite(list2);
        System.out.println("导出成功");
    }

工具类方法如下。拿来即用

java">//保存路径与名字（也可以放进工具类，通过参数传递）
    private final static String fileName = "E:\\" + System.currentTimeMillis() + ".xlsx";
    /**
     * 简易版动态导出
     * @param heads		表头
     * @param head		主表头
     * @param list		表数据
     */
    @Test
    public static void easyUtil(List<String> heads,String head,List<Map<String, Object>> list){
//    public void easyUtil(){

        List<Object> objects = new ArrayList<>();
        List<List<String>> hs = new ArrayList<>();
        for (String s : heads) {
            hs.add(Arrays.asList(head,s));
        }
//        List<Map<String, Object>> l = new ArrayList<>();
        Collection<Object> values;
        List<List<Object>> list2 = new ArrayList<>();

        for (int i = 0; i < list.size(); i++) {

            values = list.get(i).values();
            for (Object value : values) {
                objects.add(value.toString());
            }
            list2.add(objects);
        }
        EasyExcel.write(fileName).head(hs).sheet("模板（sheet名字）").doWrite(list2);
        System.out.println("导出成功");
    }

工具类测试demo

java">package excel;

import com.alibaba.excel.EasyExcel;

import java.util.*;

/**
 * @author xu
 * @Description
 * @createTime 2021年05月06日 11:45:00
 */
public class test {

    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);
    }

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

        List<Object> objects = new ArrayList<>();
        List<List<String>> hs = new ArrayList<>();
        for (String s : heads) {
            hs.add(Arrays.asList(head,s));
        }
//        List<Map<String, Object>> l = new ArrayList<>();
        Collection<Object> values;
        List<List<Object>> list2 = new ArrayList<>();

        for (int i = 0; i < list.size(); i++) {

            values = list.get(i).values();
            for (Object value : values) {
                objects.add(value.toString());
            }
            list2.add(objects);
        }
        EasyExcel.write(fileName).head(hs).sheet("模板（sheet名字）").doWrite(list2);
        System.out.println("导出成功");
    }
}