java 导出excel

准备工作：所需jar包

pom.xml

		
			org.apache.poi
			poi
			3.14
		

		
			org.apache.poi
			poi-ooxml
			3.14
		

1、工具类——ExcelUtil

public class ExcelUtil {

	
	  public static String NO_DEFINE = "no_define";//未定义的字段
	    public static String DEFAULT_DATE_PATTERN="yyyy-MM-dd";//默认日期格式
	    public static int DEFAULT_COLOUMN_WIDTH = 17;
	    
	    private final static String excel2003L =".xls";    //2003- 版本的excel  
	    private final static String excel2007U =".xlsx";   //2007+ 版本的excel  
	    /** 
	     * Excel导入
	     */  
	    public static  List> getBankListByExcel(InputStream in, String fileName) throws Exception{  
	        List> list = null;  
	        //创建Excel工作薄  
	        Workbook work = getWorkbook(in,fileName);  
	        if(null == work){  
	            throw new Exception("创建Excel工作薄为空！");  
	        }  
	        Sheet sheet = null;  
	        Row row = null;  
	        Cell cell = null;  
	        list = new ArrayList>();  
	        //遍历Excel中所有的sheet  
	        for (int i = 0; i < work.getNumberOfSheets(); i++) {  
	            sheet = work.getSheetAt(i);  
	            if(sheet==null){continue;}  
	            //遍历当前sheet中的所有行  
	            //包涵头部，所以要小于等于最后一列数,这里也可以在初始值加上头部行数，以便跳过头部  
	            for (int j = sheet.getFirstRowNum(); j <= sheet.getLastRowNum(); j++) {  
	                //读取一行  
	                row = sheet.getRow(j);  
	                //去掉空行和表头  
	                if(row==null||row.getFirstCellNum()==j){continue;}  
	                //遍历所有的列  
	                List