excel下载工具类

public static void getHSSFWorkbook(List lists,HttpServletResponse response){

        if(lists.size() == 0){
            throw new CustomizeException(1,"数组为空");
        }

        Class<?> Clazz = lists.get(0).getClass();

        Field[] fields = Clazz.getDeclaredFields();

        String[] title = new String[fields.length];

        for(int i=0;i<fields.length;i++){
            title[i] = fields[i].getName();
        }

        String fileName = Clazz.getName().substring(Clazz.getName().indexOf("V")) + System.currentTimeMillis() + ".xls";

        String sheetName = Clazz.getName().substring(Clazz.getName().indexOf("V"));

        String[][] content = new String[lists.size()][];
        for (int i=0;i<lists.size();i++) {
            //放入一维数组
            String[] l = new String[title.length];

            content[i] = l;
        }

        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");

        PropertyDescriptor pd = null;


        try {
            for(int i=0;i<lists.size();i++){
                for(int j=0;j<title.length;j++){
                    pd = new PropertyDescriptor(fields[j].getName(), lists.get(i).getClass());
                    Object invoke = pd.getReadMethod().invoke(lists.get(i));
                    if(invoke instanceof Date){
                        invoke = simpleDateFormat.format(invoke);
                    }
                    content[i][j] = String.valueOf(invoke);
                }
            }

        } catch (IntrospectionException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }

        // 第一步，创建一个HSSFWorkbook，对应一个Excel文件
        HSSFWorkbook wb = new HSSFWorkbook();

        // 第二步，在workbook中添加一个sheet,对应Excel文件中的sheet
        HSSFSheet sheet = wb.createSheet(sheetName);

        // 第三步，在sheet中添加表头第0行,注意老版本poi对Excel的行数列数有限制
        HSSFRow row = sheet.createRow(0);

        // 第四步，创建单元格，并设置值表头 设置表头居中
        HSSFCellStyle style = wb.createCellStyle();
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 创建一个居中格式

        //声明列对象
        HSSFCell cell = null;

        //创建标题
        for (int i = 0; i < title.length; i++) {
            cell = row.createCell(i);
            cell.setCellValue(title[i]);
            cell.setCellStyle(style);
        }

        //创建内容
        for (int i = 0; i < content.length; i++) {
            row = sheet.createRow(i + 1);
            sheet.setColumnWidth(i,1000);
            for(int j=0;j<content[i].length;j++){
                //将内容按顺序赋给对应的列对象
                row.createCell(j).setCellValue(content[i][j]);
            }
        }

        setResponseHeader(response,fileName);

        try {
            OutputStream os = response.getOutputStream();
            wb.write(os);
            os.flush();
            os.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    //发送响应流方法
    public static void setResponseHeader(HttpServletResponse response, String fileName) {
        try {
            try {
                fileName = new String(fileName.getBytes(),"ISO8859-1");
            } catch (UnsupportedEncodingException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            response.setContentType("application/octet-stream;charset=ISO8859-1");
            response.setHeader("Content-Disposition", "attachment;filename="+ fileName);
            response.addHeader("Pargam", "no-cache");
            response.addHeader("Cache-Control", "no-cache");
        } catch (Exception ex) {
            ex.printStackTrace();
        }


    }

只需要传入实体类

这种格式就可以