通过注解导出下载Excel

js跳转至controller

    function exportInfo(){
        window.open("../bondExport");
    }

controller伪代码

@RequestMapping(value = "/bondExport")
@ResponseBody
public void bondExport(HttpServletRequest request, HttpServletResponse response) throws IOException, IllegalAccessException {
    //后台查询返回的原始数据
	List<RzPoolBondCollection> bondList = rzBorrowRefactorService.queryBondListPage();
    //用于导出excel的数据类
	List<RzPoolBondCollectionExportVO> bondVOList = new ArrayList<>();
    //将bondList和bondVOList含有的相同属性复制bondList-->bondVOList
	for(int i = 0; i < bondList.size() ; i++) {
		RzPoolBondCollectionExportVO bondVO = new RzPoolBondCollectionExportVO();
		BeanUtils.copyProperties(bondList.get(i), bondVO);
		if(bondVO.getStatus() == 0 ) {
			bondVO.setStatus2("未收款");
		}
		if(bondVO.getStatus() == 1 ) {
			bondVO.setStatus2("已收款");
		}
		bondVOList.add(bondVO);
	}
	ExcelExportUtil<RzPoolBondCollectionExportVO> excelUtil = new ExcelExportUtil<RzPoolBondCollectionExportVO>(RzPoolBondCollectionExportVO.class);
    //导出方法
	excelUtil.export(request, response, "test.xlsx", bondVOList, 2);
}        

XxxExportVO类

public class RzPoolBondCollectionExportVO {

    @ExceVo(name = "投资用户ID",sort = 1)
    private Integer userId;

    @ExceVo(name = "大标名称",sort = 2)
    private String name;
 
    @ExceVo(name = "大标编号",sort = 3)
    private Integer borrowId;
    
    @ExceVo(name = "已转出本金",sort = 4)
    private BigDecimal bondCapital;

    //getter和setter不能省略
 }

ExcelVO类

/**
 * @des Excel 注解
 * @author mapp 2018/2/10.
 */
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
public @interface ExceVo {

    /** 对应的列名称 */
    String name() default "";

    /** 列序号 */
    int sort();

    /** 字段类型对应的格式 */
    String format() default "";

    /** 是否需要校验 */
    boolean isCheck() default false;

    /** 校验字段长度 */
    int fieldLength() default 50;

    /** 校验是否可以为空 */
    boolean isEmpty() default true;
}

ExcelExportUtil类

public class ExcelExportUtil<T> {
 
    private Class claze;
 
    public ExcelExportUtil(Class claze) {
        this.claze = claze;
    }

    /**
     * 基于模板导出下载
     * @param fileName 模板名称
     * @param objs 导出实体集合
     * @param rowIndex excel第几行开始导出
     */

    public void export(HttpServletRequest request, HttpServletResponse response, String fileName, List<T> objs, int rowIndex) throws IOException, IllegalAccessException {
        Workbook workbook = new XSSFWorkbook();
        // 带注解并排序好的字段
        Map<String,List> fieldmap= getFieldList();
        List<Field> fieldList = fieldmap.get("value");
        List<String> namelist = fieldmap.get("name");
        CellStyle style = setCellStyle(workbook);
        Sheet sheet = workbook.createSheet("First Sheet");
        Row row = sheet.createRow(0);
        for (int i = 0; i < namelist.size(); i++) {
            Cell cell = row.createCell(i);
            cell.setCellStyle(style);
            cell.setCellValue(namelist.get(i));
        }
        for (int i = 0; i < objs.size(); i++) {
            row = sheet.createRow(i + rowIndex - 1);
            for (int j = 0; j < fieldList.size(); j++) {
                Cell cell = row.createCell(j);
                cell.setCellStyle(style);
                Field field = fieldList.get(j);
                String fieldValue = covertAttrType(field, objs.get(i));
                cell.setCellValue(fieldValue);
            }
        }
        try {
            response.reset();
            response.setContentType("application/msexcel");//设置生成的文件类型
            response.setCharacterEncoding("UTF-8");//设置文件头编码方式和文件名
            response.setHeader("Content-Disposition", "attachment; filename=" + new String(fileName.getBytes("utf-8"), "ISO8859-1"));
            OutputStream os=response.getOutputStream();
            workbook.write(os);
            os.flush();
            os.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 设置样式
     * @param workbook
     */
    private CellStyle setCellStyle(Workbook workbook) {
        CellStyle style = workbook.createCellStyle();
        Font font = workbook.createFont();
        font.setFontHeightInPoints((short) 12);
        style.setFont(font);
        style.setAlignment(XSSFCellStyle.ALIGN_CENTER);
        style.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
        return style;
    }
 
    /**
     * 获取带注解的字段 并且排序
     * @return
     */
    private Map<String,List> getFieldList() {
        Field[] fields = this.claze.getDeclaredFields();
        // 无序
        List<Field> fieldList = new ArrayList<Field>();
        // 排序后的字段
        List<Field> fieldSortList = new LinkedList<Field>();
        List<String> namelist = new LinkedList<String>();
        int length = fields.length;
        int sort = 0;
        Field field = null;
        // 获取带注解的字段
        for (int i = 0; i < length; i++) {
            field = fields[i];
            if (field.isAnnotationPresent(ExceVo.class)) {
                fieldList.add(field);
                ExceVo exceVo = field.getAnnotation(ExceVo.class);
               String name= exceVo.name();
               sort = exceVo.sort();
               namelist.add(name);
            }
        }
 
        Assert.assertNotNull("未获取到需要导出的字段", fieldList);
        length = fieldList.size();
        Map<String , List >map=new HashMap<>();
        for (int i = 1; i <= length; i++) {
            for (int j = 0; j < length; j++) {
                field = fieldList.get(j);
                ExceVo exceVo = field.getAnnotation(ExceVo.class);
                field.setAccessible(true);
                sort = exceVo.sort();
                if (sort == i) {
                    fieldSortList.add(field);
                    continue;
                }
            }
        }
        map.put("value", fieldSortList);
        map.put("name", namelist);
        return map;
    }

    /**
     * 类型转换 转为String
     */
    private String covertAttrType(Field field, T obj) throws IllegalAccessException {
        if (field.get(obj) == null) {
            return "";
        }
        ExceVo exceVo = field.getAnnotation(ExceVo.class);
        String type = field.getType().getSimpleName();
        String format = exceVo.format();
         if ("Date".equals(type)) {
            return DateFormatUtils.format((Date)field.get(obj), "yyyy-MM-dd");
        }else {
            return field.get(obj).toString();
        }
    }
}