zk导出excel

我写这些的主要目的是方便以后查阅，当然也是为了和朋友们互相学习，如果各位有什么好的方法和建议请分享一下
row javabean

public class Row {
	private List<Column> columnList= new ArrayList();
	
	public List<Column> getColumnList() {
		return columnList;
	}

	public void setColumnList(List<Column> columnList) {
		this.columnList = columnList;
	}

	public void appendColumn(Column column){
		columnList.add(column);
	}
}

column javabean

public class Column {

	private int columnNum;
	private String columnLabel;
	public int getColumnNum() {
		return columnNum;
	}
	public void setColumnNum(int columnNum) {
		this.columnNum = columnNum;
	}
	public String getColumnLabel() {
		return columnLabel;
	}
	public void setColumnLabel(String columnLabel) {
		this.columnLabel = columnLabel;
	}
	
}

sheet javabean

public class Sheet {

	private List<Row> rowList = new ArrayList();
	private String name;


	public List<Row> getRowList() {
		return rowList;
	}

	public void setRowList(List<Row> rowList) {
		this.rowList = rowList;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}
	
	public void appendRow(Row row){
		rowList.add(row);
	}
	
}

Excel后台类

public class Excel{
	
	public static void write(List<Sheet>sheetList,OutputStream os){
	    jxl.write.WritableWorkbook wwb;
	    jxl.write.WritableFont wf1=new jxl.write.WritableFont(WritableFont.ARIAL,20,WritableFont.BOLD,false,
	    		UnderlineStyle.DOUBLE_ACCOUNTING,jxl.format.Colour.BRIGHT_GREEN);
	    jxl.write.WritableCellFormat wff1=new jxl.write.WritableCellFormat(wf1);
		try {
//		    wff1.setBackground(jxl.format.Colour.VIOLET2);
//		    wff1.setBackground(jxl.format.Colour.VIOLET2);
			wwb = Workbook.createWorkbook(os);
			int i = 0;
			for(Iterator<Sheet>itr = sheetList.iterator();itr.hasNext();){
				Sheet sheet = itr.next();
		    	int rowNum =0;
			    jxl.write.WritableSheet ws = wwb.createSheet(sheet.getName(),i);
			    for(Iterator<Row>sheetItr = sheet.getRowList().iterator();sheetItr.hasNext();){
			    	Row row = sheetItr.next();
				    int colunNum = 0;
			    	for(Iterator<Column>rowIterator=row.getColumnList().iterator();rowIterator.hasNext();){
			    		Column column = rowIterator.next();
			    		ws.addCell(new jxl.write.Label(colunNum,rowNum,column.getColumnLabel(),wff1));
				    	colunNum++;
			    	}
		    		rowNum++;
			    }
			    i++;
			}
		    //写入Exel工作表
		    wwb.write();
		    //关闭Excel工作薄对象
		    wwb.close();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

实现导出excel的方法，在前台加一个按钮调用onAdd2（）方法

 public void onAdd2(ForwardEvent event) throws Exception{
		Excel excel=new Excel();
		if(listbox.getSelectedItem()==null){
			Messagebox.show("请选择要导出报表的内容！", "提示信息", Messagebox.OK, Messagebox.INFORMATION);
		}
		else{
		 Date   dat=new   Date();   
         //dat.setTime(dat.getTime());               
       SimpleDateFormat   sdf   =   new   SimpleDateFormat("yyyy-MM-dd");     
       String   timeStr   =   sdf.format(dat);  
       FileSystemView fsv = FileSystemView.getFileSystemView(); 
       fsv.getHomeDirectory();
		 File f=new File(fsv.getHomeDirectory()+"//"+timeStr+ ""+listbox.getSelectedItem().getLabel()+".xls");
		    Sheet sheet = new Sheet();
		    listbox.getSelectedItem().getValue();
		    System.out.println(listbox.getSelectedItem().getLabel());
		    sheet.setName(listbox.getSelectedItem().getLabel()+"的费用报表");   
		 	Set set = listbox.getSelectedItems();
		 	for(Iterator iter= set.iterator();iter.hasNext();)
		 	{
		 		Row row = new Row();
		 		Listitem listitem = (Listitem) iter.next();
		 		List columnList = new ArrayList();
			    for(int i = 0 ; i <listitem.getChildren().size();i++)
			    {
			    	Column column = new Column();
			    	column.setColumnLabel(((Listcell)listitem.getChildren().get(i)).getLabel());
			    	column.setColumnNum(i);
			    	columnList.add(column);
			    }
			    row.setColumnList(columnList);
			    sheet.appendRow(row);
		 	}
		    List list = new ArrayList();
		    list.add(sheet);
		    new Excel().write(list,new FileOutputStream(f));
		    Messagebox.show("导出excel成功", "提示信息", Messagebox.OK, Messagebox.INFORMATION);
		}
	}

//appendTitleRow

private Row appendTitleRow(Sheet sheet){
		Row row = new Row();
 		List columnList = new ArrayList();
	    for(int i = 0 ; i <exportTitles.length;i++)
	    {
	    	Column column = new Column();
	    	column.setColumnLabel(exportTitles[i]);
	    	column.setColumnNum(i);
	    	column.setType("title");
	    	row.appendColumn(column);
	    }
	    sheet.appendRow(row);
	    return row;
	}