EasyExcel工具类，使用示例

 工具类：

 1、ExcelUtil.java

public class ExcelUtil<T> {

    /***
     * 读取Excel方法
     */
    public static <T extends BaseRowModel> ArrayList<T> readExcel(MultipartFile excel, Class<T> clazz) {
        try {
            InputStream in = new BufferedInputStream(excel.getInputStream());
            GeneralExcelListener<T> listener = new GeneralExcelListener<>();
            ExcelReader excelReader = new ExcelReader(in, ExcelTypeEnum.XLS, listener);
            excelReader.read(new Sheet(1, 1, clazz));
            return listener.getSuccessDatas();

        } catch (Exception e) {

            return new ArrayList<T>();
        }

    }


    /**
     * 导出 Excel ：一个 sheet，带表头
     *
     * @param response  HttpServletResponse
     * @param list      数据 list，每个元素为一个 BaseRowModel
     * @param fileName  导出的文件名
     * @param sheetName 导入文件的 sheet 名
     * @param object    映射实体类，Excel 模型
     */
    public static void writeExcel(HttpServletResponse response, List<? extends BaseRowModel> list,
                                  String fileName, String sheetName, BaseRowModel object) {
        ExcelWriter writer = new ExcelWriter(getOutputStream(fileName, response), ExcelTypeEnum.XLSX);
        Sheet sheet = new Sheet(1, 0, object.getClass());
        sheet.setSheetName(sheetName);
        writer.write(list, sheet);
        writer.finish();

    }




    /**
     * 导出文件时为Writer生成OutputStream
     */
    private static OutputStream getOutputStream(String fileName, HttpServletResponse response) {
        try {
            return response.getOutputStream();
        } catch (IOException e) {
            throw new RuntimeException("导出文件时为Writer生成OutputStream失败！");
        }
    }

    /**
     * 返回 ExcelReader
     *
     * @param excel         需要解析的 Excel 文件
     * @param excelListener new ExcelListener()
     */
    private static ExcelReader getReader(MultipartFile excel,
                                         ExcelListener excelListener) {
        String filename = excel.getOriginalFilename();
        if (filename == null || (!filename.toLowerCase().endsWith(".xls") && !filename.toLowerCase().endsWith(".xlsx"))) {
            throw new RuntimeException("文件格式错误！");
        }
        InputStream inputStream;
        try {
            inputStream = new BufferedInputStream(excel.getInputStream());
            return new ExcelReader(inputStream, null, excelListener, false);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
}

　　

2、GeneralExcelListener.java

/**
 * 解析Excel数据，返回数据的类
 **/


public class GeneralExcelListener<T> extends AnalysisEventListener<T> {

    private final Logger logger = LoggerFactory.getLogger(this.getClass());


    //自定义用于暂时存储data。
    //可以通过实例获取该值
    private ArrayList<T> successDatas = new ArrayList<>();
    private ArrayList<T> errorDatas = new ArrayList<>();

    public GeneralExcelListener() {

    }

    @Override
    public void invoke(T o, AnalysisContext analysisContext) {

        successDatas.add(o);
    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext context) {

    }

    public ArrayList<T> getErrorDatas() {
        return errorDatas;
    }

    public ArrayList<T> getSuccessDatas() {
        return successDatas;
    }


}

　　

示例：

Controller层代码

1、导入示例

@PostMapping(value = "/import")
public ModelAndView import(@RequestParam(value = "file", required = true) MultipartFile file) {

	ModelAndView mv = new ModelAndView();
	//一行代码即可获取解析得到的Excel中的数据
	List<Test> datas = ExcelUtil.readExcel(file, Test.class);
	//然后对获取的数据，在service层进行业务处理
	ResultMsg result = provShareConfigService.insertList(datas);
	return mv;
}

　　

 2、导出示例

@PostMapping(value = "/export")
public void export(HttpServletRequest request, HttpServletResponse response, @RequestBody JSONObject ob) {
	//前端传来的参数
	String date = ob.getString("date");
	String fileName = "退赔导出";
	String sheetName = "sheet1";
	//从数据库得到的list集合
	List<Test> list = testService.selectAll(date);
	//一行代码即可导出
	ExcelUtil.writeExcel(response, list, fileName, sheetName, new Test());
}