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Date: Tue, 8 Nov 2016 17:58:45 +0800
Subject: [PATCH] =?UTF-8?q?=E4=B8=8A=E4=BC=A0=E5=B7=A5=E5=85=B7=E4=BB=A3?=
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---
 ExcelUtil.java | 217 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 217 insertions(+)
 create mode 100644 ExcelUtil.java

diff --git a/ExcelUtil.java b/ExcelUtil.java
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+++ b/ExcelUtil.java
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+import java.io.IOException;
+import java.io.OutputStream;
+import java.lang.reflect.Field;
+import java.text.SimpleDateFormat;
+import java.util.Calendar;
+import java.util.Date;
+import java.util.List;
+import java.util.Map;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.apache.poi.hssf.usermodel.HSSFWorkbook;
+import org.apache.poi.ss.usermodel.Cell;
+import org.apache.poi.ss.usermodel.Row;
+import org.apache.poi.ss.usermodel.Sheet;
+import org.apache.poi.ss.usermodel.Workbook;
+
+/**
+ * 使用poi报表导出工具类
+ * 把poi的一个调用接口抽出来，便于导出功能的管理
+ * @author LiangXianYou lxy208@126.com
+ * @param 
+ *
+ */
+public class ExcelUtil {
+	
+	/**
+	 * <b>导出list中map做载体的数据到excel</b><br>
+	 * 参数说明：<br>
+	 * 	list:存放了Map数据的集合<br>
+	 * 	hdNames:表头列名<br>
+	 * 	hds:对应表头的数据KEY<br>
+	 *  xlsName:导出文件名<br>
+	 * @author LiangXianYou
+	 * @date 2015-6-25 上午10:22:51
+	 */
+	public static <T> boolean outPutExcelByMap(List<Map<String, Object>> list, String[] hdNames, String[] hds, String xlsName, HttpServletRequest request, HttpServletResponse response) throws Exception{
+		
+		Workbook wb = new HSSFWorkbook();			//创建工作薄
+		Sheet sheet = wb.createSheet();				//创建工作表
+		sheet.autoSizeColumn(( short ) 0 );			//自适应宽度
+		//写入表头---Excel的第一行数据
+		Row nRow = sheet.createRow(0);				//创建行
+		for(int i=0;i<hdNames.length;i++){
+			Cell nCell = nRow.createCell(i);			//创建单元格
+			nCell.setCellValue(hdNames[i]);
+		}  
+		
+		//写入每一行数据---一条记录就是一行数据
+		for(int i=0;i<list.size();i++){
+			for(int j=0;j<hds.length;j++){
+				Object o = list.get(i).get(hds[j]);		//得到列的值
+				data2Excel(sheet, o, i+1, j);			//将值写入Excel
+			}
+		}
+		return downloadExcel(wb, xlsName, request, response);
+	}
+
+	/**
+	 * Excels导出多个sheet
+	 * @author LiangXianYou
+	 * @date 2015-6-16 下午5:56:56
+	 */
+	//map:data,sheetName,hds,hdNames,xlsName;request,response
+	public static <T> boolean outPutExcels(List<Map<String, Object>> list,String xlsName, HttpServletRequest request, HttpServletResponse response) throws Exception{
+
+		Workbook wb = new HSSFWorkbook();			//创建工作薄
+		for(int i=0;i<list.size();i++){
+			Map<String, Object> map = list.get(i);
+			Sheet sheet = wb.createSheet();				//创建工作表
+			String sheetName = (String) map.get("sheetName");
+			wb.setSheetName(i, sheetName);
+			//写入表头---Excel的第一行数据
+			Row nRow = sheet.createRow(0);				//创建行
+			String[] hdNames = (String[]) map.get("hdNames");
+			for(int j=0;j<hdNames.length;j++){
+				Cell nCell = nRow.createCell(j);			//创建单元格
+				nCell.setCellValue(hdNames[j]);
+			}
+			
+			//写入每一行数据---一条记录就是一行数据
+			@SuppressWarnings("unchecked")
+			List<T> data = (List<T>) map.get("data");
+			String[] hds = (String[]) map.get("hds");
+			for(int j=0;j<data.size();j++){
+				for(int k=0;k<hds.length;k++){
+					Object o = getFieldValue(data.get(j), hds[k]);	//得到列的值
+					data2Excel(sheet, o, j+1, k);					//将值写入Excel
+				}
+			}
+		}
+		
+		return downloadExcel(wb, xlsName, request, response);
+	}
+	
+	/**
+	 * 参数说明：
+	 * list：list数据集合
+	 * hdNames：表头需要显示的名称
+	 * hds：表头对应的对象属性名称，和 hdNames一一对应
+	 * xlsName：导出Excel的预定义名称
+	 * request:	HttpServletRequest
+	 * response：HttpServletResponse
+	 * 通过数据构建Excel
+	 * @author LiangXianYou
+	 * @throws Exception 
+	 * @date 2015-3-13 上午11:00:30
+	 */
+	public static <T> boolean outPutExcel(List<T> list, String[] hdNames, String[] hds, String xlsName, HttpServletRequest request, HttpServletResponse response) throws Exception{
+		
+		Workbook wb = new HSSFWorkbook();			//创建工作薄
+		Sheet sheet = wb.createSheet();				//创建工作表
+		sheet.autoSizeColumn(( short ) 0 );			//自适应宽度
+		//写入表头---Excel的第一行数据
+		Row nRow = sheet.createRow(0);				//创建行
+		for(int i=0;i<hdNames.length;i++){
+			Cell nCell = nRow.createCell(i);			//创建单元格
+			nCell.setCellValue(hdNames[i]);
+		}
+		
+		//写入每一行数据---一条记录就是一行数据
+		for(int i=0;i<list.size();i++){
+			for(int j=0;j<hds.length;j++){
+				Object o = getFieldValue(list.get(i), hds[j]);	//得到列的值
+				data2Excel(sheet, o, i+1, j);						//将值写入Excel
+			}
+		}
+		return downloadExcel(wb, xlsName, request, response);
+	}
+	
+	/**
+	 * 传递一个Wookbook，给定文件名，以及request和response下载Excel文档 
+	 * @author LiangXianYou
+	 * @throws IOException
+	 * @date 2015-3-13 上午9:00:36
+	 */
+	@SuppressWarnings("all")
+	private static boolean downloadExcel(Workbook wb, String xlsName, HttpServletRequest request, HttpServletResponse response) throws IOException{
+			if(request.getHeader("user-agent").indexOf("MSIE") != -1) {   
+				xlsName = java.net.URLEncoder.encode(xlsName,"utf-8") + ".xls"; 
+			} else {
+			    xlsName = new String(xlsName.getBytes("utf-8"),"iso-8859-1")+ ".xls";   
+			}
+			OutputStream os = response.getOutputStream();
+			response.setContentType("application/vnd.ms-excel");    
+			response.setHeader("Content-disposition", "attachment;filename="+xlsName);    
+			
+			wb.write(os);
+			return true;
+	}
+	
+	/**
+	 * 通过泛型实例对象得到某一字段值
+	 * @author LiangXianYou
+	 * @date 2015-3-13 上午10:53:32
+	 */
+	private static <T> Object  getFieldValue(T t, String fieldName) throws Exception{
+		if(t == null){
+			return null;
+		}
+		Field field = t.getClass().getDeclaredField(fieldName);
+		field.setAccessible(true);//暴力反射
+		Object o = field.get(t);//得到字段数据的值
+		return o;
+	}
+	
+	/**
+	 * 将数据写到Excel中
+	 * @author LiangXianYou
+	 * @date 2015-3-13 上午10:37:55
+	 */
+	private static void data2Excel(Sheet sheet, Object o, Integer r, Integer c){
+		//通过获得sheet中的某一列，有得到，没有创建
+		Row nRow = sheet.getRow(r);
+		if(nRow == null){
+			nRow = sheet.createRow(r);
+		}
+//		nRow.setColumnWidth(r, arg1);
+		
+		Cell nCell = nRow.createCell(c);
+		
+		
+		//根据不同类型进行转化，如有其它类型没有考虑周全的，使用发现的时候添加
+		char type = 'x';
+		if(o instanceof Integer){
+			type = 1;
+		}else if(o instanceof Double){
+			type = 2;
+		}else if(o instanceof Float){
+			type = 3;
+		}else if(o instanceof String){
+			type = 4;
+		}else if(o instanceof Date){
+			type = 5;
+		}else if(o instanceof Calendar){
+			type = 6;
+		}else if(o instanceof Boolean){
+			type = 7;
+		}else if(o == null) {
+			type = 8;
+		}
+		
+		switch (type) {
+			case 1:nCell.setCellValue((Integer)o);break;
+			case 2:nCell.setCellValue((Double)o);break;
+			case 3:nCell.setCellValue((Float)o);break;
+			case 4:nCell.setCellValue((String)o);break;
+			case 5:nCell.setCellValue(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(o));break;
+			case 6:nCell.setCellValue((Calendar)o);break;
+			case 7:nCell.setCellValue((Boolean)o);break;
+			case 8:nCell.setCellValue("");break;
+			default:nCell.setCellValue(o + "");break;
+		}
+	}
+	
+}