POI Excel 导出工具类

 

 

   POI Excel 导出工具类

  

package com.hengyu.ticket.util;

import java.util.List;
import java.util.Map;

import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFFont;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;


/**
 * excel处理
 * @author LGF
 * 2015-12-21
 */
public class ExcelHanlder {
	
	//默认高度
	private static short DEFAULT_ROW_HEIGHT = 400;
	//默认宽度
	private static int DEFAULT_CELL_WIDTH = 3000;

	
	/**
	 * 
	 * @param book 工作簿对象,【可选】
	 * @param hanlder 自定义类型处理【可选】
	 * @param titles 标题
	 * @param columns 列名(Map类型处理,自定义可选)
	 * @param columnsWidth 宽度
	 * @param height 行高
	 * @param sheetTitle 表标题
	 * @param datas 数据
	 * @return
	 */
	@SuppressWarnings("all")
	public static XSSFWorkbook exportExcel(XSSFWorkbook book,ExcelTypeHanlder hanlder,String[] titles,String[] columns
			,Integer[] columnsWidth,Short height,String sheetTitle,List datas){
		
		if(book==null){
			book = new XSSFWorkbook();
		}
		
		int size = DEFAULT_CELL_WIDTH;
		
		//列大小
		if(columnsWidth!=null&&columnsWidth.length==1){
			size = columnsWidth[0];
		}
		if(height==null){
			height = DEFAULT_ROW_HEIGHT;
		}
		XSSFSheet sheet = book.createSheet(sheetTitle);
		int rowindex = 0;
		XSSFRow firstrow = sheet.createRow(rowindex);
		rowindex++;
		sheet.setDefaultColumnWidth(size);
		firstrow.setHeight(height);
		
		XSSFFont font = book.createFont();
		font.setBold(true);
		XSSFCellStyle cellstyle = book.createCellStyle();
		cellstyle.setFont(font);
		cellstyle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
		
		//标题
		if(titles!=null){
			int index = 0;
			for (String title : titles) {
				XSSFCell cell = firstrow.createCell(index);
				cell.setCellStyle(cellstyle);
				cell.setCellValue(title);
				//列宽度设置
				if(columnsWidth==null||columnsWidth.length==0||columnsWidth.length==1){
					sheet.setColumnWidth(cell.getColumnIndex(), size);
				}else{
					if((columnsWidth.length-1)>=index){
						sheet.setColumnWidth(cell.getColumnIndex(), columnsWidth[index]==null?size:columnsWidth[index]);
					}else{
						sheet.setColumnWidth(cell.getColumnIndex(), size);
					}
				}
				index++;
			}
		}
		if(datas==null){
			return book;
		}
		
		//写入数据
		for (Object data : datas) {
			
			//map 类型处理
			if(data instanceof Map){
				Map<String,Object> map = (Map<String, Object>) data;
				XSSFRow row = sheet.createRow(rowindex);
				int i = 0;
				for (String column : columns) {
					XSSFCell cell = row.createCell(i);
					Object val = map.get(column);
					if(hanlder!=null&&val==null){
						Object temp = hanlder.dataNullHander(column,map);
						cell.setCellValue(temp!=null?temp.toString():"");
					}else{
						cell.setCellValue(val!=null?val.toString():"");
					}
					i++;
				}
				row.setHeight(DEFAULT_ROW_HEIGHT);
				rowindex++;
			}else{
				//其他处理
				if(hanlder!=null){
					Object obj = data;
					XSSFRow row = sheet.createRow(rowindex);
					hanlder.typeHanlder(data, row);
					rowindex++;
				}
			}
		}
		return book;
	} 
	
	
	/**
	 * 
	 * @param book 工作簿对象,【可选】
	 * @param titles 标题
	 * @param columns 列名(Map类型处理,自定义可选)
	 * @param sheetTitle 表标题
	 * @param datas 数据
	 * @return
	 */
	public static XSSFWorkbook exportExcel(XSSFWorkbook book,String[] titles,String[] columns,String sheetTitle,List<Map<String,String>> datas){
		return exportExcel(book, null, titles, columns,null,null, sheetTitle, datas);
	}
	
	/**
	 * @param titles 标题
	 * @param columns 列名(Map类型处理,自定义可选)
	 * @param sheetTitle 表标题
	 * @param datas 数据
	 * @return
	 */
	@SuppressWarnings("all")
	public static XSSFWorkbook exportExcel(String[] titles,String[] columns,String sheetTitle,List<Map<String,String>> datas,ExcelTypeHanlder hanlder){
		return exportExcel(null, hanlder, titles, columns,null,null, sheetTitle, datas);
	}
	
	public static XSSFWorkbook exportExcel(String[] titles,String[] columns,String sheetTitle,List<Map<String,String>> datas){
		return exportExcel(null, null, titles, columns,null,null, sheetTitle, datas);
	}
	
	//自定义处理对象回调
	public static abstract class ExcelTypeHanlder<T>{
		//类型处理
		public void typeHanlder(T data,XSSFRow row){
			
		}
		
		//空数据处理
		public Object dataNullHander(String column,T obj){
			return null;
		}
	}
	
	
}

 

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