//导出表头测试
	SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");
    String date = df.format(new Date());
	//生成收费项信息
	List<Title> titles = new ArrayList<Title>();
	List<BbCurrentPeriodImpl> data = new ArrayList<>();
	for(int i=0;i<10;i++){
		Title title = new Title();
		title.setFieldvalue("表头->"+i);
		title.setFieldName("value->"+i);
		titles.add(title);
		BbCurrentPeriodImpl bbCurrentPeriodImpl = new BbCurrentPeriodImpl();
		bbCurrentPeriodImpl.setId(UUID.randomUUID().toString().replaceAll("-", ""));
		bbCurrentPeriodImpl.setName("钟明宏->"+i);
		Map<String,Object> map = new HashMap<String,Object>(); 
		for(int j=0;j<10;j++){
			map.put("value->"+j, new BigDecimal(Math.random()*100));
		}
		bbCurrentPeriodImpl.setItems(map);
		data.add(bbCurrentPeriodImpl);
	}
	Map<String,Object> dataMap = new HashMap<String,Object>();
	dataMap.put("title.length", titles.size()+2);
	dataMap.put("r_e_1", 19);//设置数据
	dataMap.put("r_e_2", 20);//设置数据
	dataMap.put("end", 19);//设置数据
	ExcelXSSFExport excelXSSFExport = new ExcelXSSFExport(BbCurrentPeriodImpl.class,dataMap);//设置需要解析的实体类
	excelXSSFExport.putData(dataMap);//放置数据，也可以放在构造参数中
	excelXSSFExport.createSheet("第一个工作薄")//创建工作薄必须做，可以创建多个工作薄
	.initStyle()//初始化样式功能,必须在初始化定义行和数据之前调用
	.initRows()//初始化定义行
	.addTitle(1,titles)//添加定义表头，第一个参数为添加的位置,
	.initTitle()//初始化表头
	.forEach(data)//初始化数据
	;
	excelXSSFExport.write(new FileOutputStream(new File("E:\\报表导出表头测试"+date+".xlsx")));

自定义表头需要注解@Titles
目前只能放在map类型的字段上面,也就是说实体类里面必须有个Map类型的字段，
后面填数据也会从map里面获取
对于添加的表头的值，需要放入Title(com.goktech.commons.excel.Title)实体类中,可以参考上面的测试代码

@Font(fontName = "华文楷体")
@Style//定义全局样式
@SummaryInformation(author = "钟明宏", title = "房屋缓存表", applicationName = "Rms系统")
@Rows(rows = { 
				@Row(cells = {
					@Cell(firstCol = "1", lastCol = "${title.length}",value = "XX项目预估收入调整入账报表")}
					,firstRow = "1", lastRow = "2",style=@Style),
				@Row(cells = { 
					@Cell(firstCol = "1", lastCol = "2", value = "制表时间:"),
					@Cell(firstCol = "3", lastCol = "4", value = "${createTime}") 
					}, firstRow = "3", lastRow = "4"), 
				@Row(cells = {
					@Cell(firstCol = "1", lastCol = "2", value = "凭证日期："),
					@Cell(firstCol = "3", lastCol = "5", value = "${time}",style=@Style(fillBackgroundColor=IndexedColors.ROSE,fillForegroundColor=IndexedColors.BLUE_GREY))
					}, firstRow = "5", lastRow = "7"),
				@Row(cells = { //定义最后几行
						@Cell(firstCol = "2", lastCol = "3", value = "制单:"),
						@Cell(firstCol = "7", lastCol = "8", value = "审核:") 
						}, firstRow = "${r_e_1}", lastRow = "${r_e_2}",
						rowIndex="${end}"),//定义未知行尾	
				})

@Style(fillForegroundColor=IndexedColors.RED,fillBackgroundColor=IndexedColors.RED)
	@Excel(name="id")
	private String id;
	@Excel(name="名称")
	private String name;
	
	@Style(fillForegroundColor=IndexedColors.RED,fillBackgroundColor=IndexedColors.RED)
	@Titles
	private Map<String,Object> items;
	
	public String getId() {
		return id;
	}
	public void setId(String id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public Map<String, Object> getItems() {
		return items;
	}
	public void setItems(Map<String, Object> items) {
		this.items = items;
	}