导出Excel简单实现

创建一个servlet：代码如下

public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

	 
       List<User> dataset = new ArrayList<User>(); 
        User u = new User();
        u.setId("aaa");
        u.setRealname("aaaadddd");
        u.setPassword("123456");
        
        User u2 = new User();
        u2.setId("aaa555555555");
        u2.setRealname("aaaaddddf");
        u2.setPassword("123456566");
        dataset.add(u);
        dataset.add(u2);
	    
	    
//      List<Map<String,String>> dataset = new ArrayList<Map<String,String>>();
//	 	Map<String,String> m1 = new HashMap<String, String>();
//    	m1.put("id","aaaa");
//    	m1.put("realname", "aaaadddd");
//    	m1.put("password", "ddddd");
//    	
//    	Map<String,String> m2 = new HashMap<String, String>();
//    	m2.put("id","aaa555555555");
//    	m2.put("realname", "123456566");
//    	m2.put("password", "aaaaddddf");
//    	
//    	userBankCardList.add(m1);
//    	userBankCardList.add(m2);
    	
    	HSSFWorkbook workbook = genHSSFWorkBook(genTableHead(),dataset);  
        
    	
    	ServletOutputStream sos = null;
    	
    	try{
    		response.reset();
    		sos = response.getOutputStream();
    		workbook.write(sos);
    		response.setContentType("application/octet-stream;charset=UTF-8");  
    		response.setHeader("Content-Disposition","attachment; filename="+ URLEncoder.encode("测试导出.xlsx", "utf-8"));  
//     		response.setHeader("Pragma", "public");  
//          response.setHeader("Cache-Control","public");
    	}catch(Exception e){
    		e.printStackTrace();
    	}finally{
    		sos.flush();
    		sos.close();
    	}
	}

//生成Excel
//	public  HSSFWorkbook genHSSFWorkBook(Map<String, String> map,List<Map<String,String>> userBankCardList) {
	public  HSSFWorkbook genHSSFWorkBook(Map<String, String> map,List<User> dataset) {
	// 声明一个工作薄  
        HSSFWorkbook workbook = new HSSFWorkbook();  
        // 生成一个表格  - sheet页的名称
        HSSFSheet sheet = workbook.createSheet("用户银行卡导出");  
        // 设置表格默认列宽度为15个字节  
        sheet.setDefaultColumnWidth(15);  
  
        // 产生表格标题行  下标从0开始
        HSSFRow row = sheet.createRow(0);  
        
        List<String> list = Arrays.asList(map.keySet().toArray(new String[map.keySet().size()]));
        
        for (int i = 0; i <list.size(); i++){  
            HSSFCell cell = row.createCell(i);  
            cell.setCellValue(list.get(i));  
        }  
        
        for(int i=0;i<dataset.size();i++){
		    row = sheet.createRow(i+1);  
	        List<String> fileNameList = Arrays.asList(map.values().toArray(new String[map.values().size()]));
	        for (int j = 0; j < fileNameList.size(); j++){  
	            HSSFCell cell = row.createCell(j);  
	            String value = null;
	            try{  
 	                 value = BeanUtils.getProperty(dataset.get(i), fileNameList.get(j));
	                 //value = dataset.get(i).get(fileNameList.get(j));
	            }catch (Exception e){  
	                e.printStackTrace();  
	                value=null;
	                System.out.println("++++++++++++值获取失败字段+++++++++++" + fileNameList.get(j));
	            }
	            cell.setCellValue(value);  
	         }  
        }
        System.out.println("++++++++++++写入成功+++++++++++" + dataset.size());
		return workbook;
	}
   
   //自定义的表头和字段必须与一一对应
   private Map<String, String> genTableHead() {
		Map<String,String> map = new LinkedHashMap<String,String>();     
        map.put("用户ID","id");
        map.put("真实姓名", "realname");
        map.put("身份证号", "password");
		return map;
	}
        //内部类User
      	class User implements Serializable{
		private static final long serialVersionUID = 1L;
		private String id;
		private String realname;
		private String password;
		public String getId() {
			return id;
		}
		public void setId(String id) {
			this.id = id;
		}
		public String getRealname() {
			return realname;
		}
		public void setRealname(String realname) {
			this.realname = realname;
		}
		public String getPassword() {
			return password;
		}
		public void setPassword(String password) {
			this.password = password;
		}
	}
	
}

使用jar包：pio-3.8-20120326.jar

参考地址：

http://blog.csdn.net/evangel_z/article/details/7332535

http://download.csdn.net/detail/evangel_z/3895051

http://www.open-open.com/lib/view/open1429847388213.html