java 导出excel表格（.xlsx）

 jsp 页面
	首先需要引入jquery.redirect.js
	<button onclick="exportExcel();">导出</button>

  js页面
 
 function exportExcel(){
		var param = {"userId":userId};
		$.redirect(path+ '/exportExcel.action',param);
	}
 

 后台：
 
 public class BjUserVO {
	
	 private String username;
	 private String sex ;
	 private String age;
	 private String department;// 单位
	 private String part;// 部门
	 
  }
  //需要注意的是headers 里面的字段的先后顺序要和BjUserVO里面的先后顺序保持一致
 public void exportExcel() throws Exception {
        List<BjUserVO> list = new ArrayList<BjUserVO>();
		HttpServletResponse response = ServletActionContext.getResponse();
		list = bjSrvService.queryBjUserDetail(userId);
		ExportAndImportCommonExcel<BjUserVO> ee= new ExportAndImportCommonExcel<BjUserVO>();  
        String[] headers = { "姓名", "性别", "年龄", "单位" ,"部门"};  
        String fileName = "人员详情表";      
        ee.exportExcel(headers,list,fileName,response);
	}
 
 
 
//下面是导出的共用的模板(要是有样式的不统一的话就需要根据需求做相应的变化)
public class ExportAndImportCommonExcel<T> {
	/**
	 * @Title: exportExcel
	 * @Description: 导出excel
	 * @Return: void
	 * @throws 
	 * @param object     实体
	 * @param headers    标题
	 * @param bjSrvNotifyList       数据
	 * @param fileName   文件名称
	 * @param response   输出
	 */
	 @SuppressWarnings({ "rawtypes", "unchecked" })
	public void exportExcel(String[] headers,List list, String fileName,HttpServletResponse response) {  
	        // 声明一个工作薄  
	        XSSFWorkbook workbook = new XSSFWorkbook();  
	        // 生成一个表格  
	        XSSFSheet sheet = workbook.createSheet(fileName);  
	        // 设置表格默认列宽度为15个字节  
	        sheet.setDefaultColumnWidth((short) 20); 
	        // 产生表格标题行  
	        XSSFRow row = sheet.createRow(0);  
	        for (short i = 0; i < headers.length; i++) {  
	            XSSFCell cell = row.createCell(i);  
	            XSSFRichTextString text = new XSSFRichTextString(headers[i]);  
	            cell.setCellValue(text);  
	        }  
	        try {  
	            // 遍历集合数据，产生数据行  
	            Iterator<T> it =  (Iterator<T>) list.iterator();  
	            int index = 0;  
	            while (it.hasNext()) {  
	                index++;  
	                row = sheet.createRow(index);  
	                T t = (T) it.next(); 
	                // 利用反射，根据javabean属性的先后顺序，动态调用getXxx()方法得到属性值  
	                Field[] fields = t.getClass().getDeclaredFields();  
	                for (short i = 0; i < headers.length; i++) {  
	                    XSSFCell cell = row.createCell(i);  
	                    Field field = fields[i];  
	                    String fieldName = field.getName(); 
	                    String getMethodName = "get" + fieldName.substring(0, 1).toUpperCase() + fieldName.substring(1);  
	                    Class tCls = t.getClass();  
	                    Method getMethod = tCls.getMethod(getMethodName, new Class[] {});  
	                    Object value = getMethod.invoke(t, new Object[] {}); 
	                    // 判断值的类型后进行强制类型转换  
	                    DateFormat df = new SimpleDateFormat("yyyy-MM-dd");
	                    String textValue = null; 
	                    if(fieldName.equals("conSignTime")){
	                    	textValue = df.format(value).substring(0, 10);
	                    }
	                    // 其它数据类型都当作字符串简单处理  
	                    else if(value != null && value != ""){  
	                        textValue = value.toString();  
	                    }  
	                    if (textValue != null) {  
	                        XSSFRichTextString richString = new XSSFRichTextString(textValue);  
	                        cell.setCellValue(richString);  
	                    }  
	                }  
	            }  
	            getExportedFile(workbook, fileName,response);  
	        } catch (Exception e) {  
	            e.printStackTrace();  
	        }   
	    }  
	      
	    /** 
	     *  
	     * 方法说明: 指定路径下生成EXCEL文件 
	     * @return 
	     */  
	    public void getExportedFile(XSSFWorkbook workbook, String name,HttpServletResponse response) throws Exception {  
	        BufferedOutputStream fos = null; 
	        DateFormat df = new SimpleDateFormat("yyyy-MM-dd");
	        try {  
	            String fileName = name+df.format(new Date())+ ".xlsx";  
	            response.setContentType("application/vnd.ms-excel");  
	            response.setHeader("Content-Disposition", "attachment;filename=" + new String( fileName.getBytes("gb2312"), "ISO8859-1" ));  
	            fos = new BufferedOutputStream(response.getOutputStream());  
	            workbook.write(fos);  
	        } catch (Exception e) {  
	            e.printStackTrace();  
	        } finally {  
	            if (fos != null) {  
	                fos.close();  
	            }  
	        }  
	    }
 
}