java jxl

/**
	 * 导出excel
	 * @param list :结果集;
	 * @param filePath：指定路径名；
	 * @param out:输出流，response.getOutputStream()；
	 * @param mapFields:导出字段对应的key(类字段实体)， value:对应表显示的列名称；
	 * @param sheetName:当前工作表名称；
	 */
	public static void createExcel(List list, String filePath, OutputStream out, Map<String, String> mapFields,
			String sheetName){
		if(null==sheetName || "".equals(sheetName))// 为空则默认设置：sheet1
			sheetName = "sheet1" ;
		WritableWorkbook wook = null;
		try{
			if(null!=filePath && !"".equals(filePath))
				wook = Workbook.createWorkbook(new File(filePath));
			else
				wook = Workbook.createWorkbook(out);
			
			// 设置头部字体格式
			WritableFont font = new WritableFont(WritableFont.TIMES, 12, WritableFont.BOLD);
			font.setColour(Colour.RED);
			// 应用字体
			WritableCellFormat wcfh = new WritableCellFormat(font);
			// 设置其它样式
			wcfh.setAlignment(Alignment.CENTRE);//水平对齐
			wcfh.setVerticalAlignment(VerticalAlignment.CENTRE); //垂直居中
			wcfh.setBorder(Border.ALL, BorderLineStyle.THIN);//边框
			wcfh.setBackground(Colour.YELLOW);	// 背景色
			wcfh.setWrap(false);//自动换行
			
			
			WritableFont font_text = new WritableFont(WritableFont.TIMES, 11, WritableFont.NO_BOLD);
			WritableCellFormat wcfc = new WritableCellFormat(font_text);
			// 设置其它样式
			wcfc.setAlignment(Alignment.CENTRE);//水平对齐
			wcfc.setVerticalAlignment(VerticalAlignment.CENTRE); //垂直居中
			wcfc.setBorder(Border.ALL, BorderLineStyle.THIN);//边框
			wcfc.setWrap(false);//自动换行
			
			// 创建工作表
			WritableSheet sheet = wook.createSheet(sheetName, 0);
			SheetSettings setting = sheet.getSettings();// 冻结窗口头部
			setting.setVerticalFreeze(1);

			Integer columnIndex = 0 ;
			List<String> methodNameList = new ArrayList<String>();
			
			// 添加列标题
			if(null!=mapFields){
				String key = "" ;
				//开始导出表格头部
				for(Iterator<String> i=mapFields.keySet().iterator(); i.hasNext();){
					key = i.next();
					// 应用wcfh样式创建单元格
					sheet.addCell(new Label(columnIndex, 0, mapFields.get(key), wcfh));
					//记录字段的顺序，以便于导出的内容与字段不出现偏移
					methodNameList.add(key);
					columnIndex++;
				}
				
				//导出表格内容
				if(null!=list && list.size()>0){
					Object objClass = null;
					Map<String,Method> getMap = null;
					Method method = null;
					for(int i=0, len=list.size(); i<len; i++){
						objClass = list.get(i);
						//获得对象所有的get方法
						getMap = getAllMethod(objClass); 
						//按保存的字段顺序导出内容
						for(int k=0; k<methodNameList.size(); k++){
							// 根据key获取对应的方法
							method = getMap.get("GET" + methodNameList.get(k).toString().toUpperCase());
							if(null!=method){
								// 从对应的get方法得到返回值
								String value = method.invoke(objClass, null).toString();
								//应用wcfc样式创建单元格
								sheet.addCell(new Label(k, i+1, value, wcfc));
							}else{
								//如果没有对应的get方法，则默认将内容设为""
								sheet.addCell(new Label(k, i+1, "", wcfc));
							}
						}
					}
				}
				wook.write();
			}
			System.out.println("生成Excel表格完成；");
		}catch(Exception e){
			e.printStackTrace();
		}finally{
			try {
				if(null!=wook)
					wook.close();
				if(null!=out)
					out.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
	
	/**
	 * 获取类的所有get方法
	 * @param args
	 */
	public static HashMap<String, Method> getAllMethod(Object obj){
		HashMap<String,Method> map = new HashMap<String,Method>();
		Method[] methods = obj.getClass().getMethods();	// 得到所有的方法
		String methodName = "" ;
		for(int i=0; i<methods.length; i++){
			methodName = methods[i].getName().toUpperCase();// 方法名
			if(methodName.startsWith("GET")){
				map.put(methodName, methods[i]);
			}
		}
		return map;
	}
	
	public static void main(String[] args){
		User user = new User();
		user.setAge(24);
		user.setAlipayAccount("1311111111");
		user.setName("test001");
		user.setTotal(360.00);
		
		User user2 = new User();
		user2.setAge(36);
		user2.setAlipayAccount("[e-mail]");
		user2.setName("test002");
		user2.setTotal(721.50);
		
		List list = new ArrayList();
		list.add(user);
		list.add(user2);
		
		String filePath = "E:\\20141015.xls";
		OutputStream out = null ;
		Map mapFields = new HashMap();
		mapFields.put("total", "总额");
		mapFields.put("age", "年龄");
		mapFields.put("alipayAccount", "帐号");
		mapFields.put("name", "名称");
		
		String sheetName = "test" ;
		createExcel(list, filePath, out, mapFields, sheetName);
		
	}