(后端)如何将数据库的表导出生成Excel？

1.如何经过元数据拿到数据库的信息？ 
2.如何用Java生成Excel表？ 
3.将数据库中的表导出生成Excel案例

如何经过元数据拿到数据库的信息

元数据：描述数据的数据

Java中使用元数据的两个方法

• DatabaseMetaData 经过链接能够拿到的信息：数据库软件，全部数据库名，全部数据库里面的表名，描述数据库的元数据
• ResultSetMetaData 拿到的表结构信息：得到表的列数目 类型和属性 ，描述数据库表的元数据

DatabaseMetaData 的使用学习

@Test// DatabaseMetaData 经过链接能够拿到的信息：数据库软件，全部数据库名，全部数据库里面的表名 public void DatabaseMetaData_Demo() throws Exception{ // 本身写的工具包来得到数据库链接 Connection con = ConnUtils4.getConn(); //DatabaseMetaData 经过链接得到 DatabaseMetaData dbmt = con.getMetaData(); // 数据库软件名 System.out.println(" 数据库软件名:"+dbmt.getDatabaseProductName()); // 拿到全部数据库名字 ResultSet rs =dbmt.getCatalogs(); List<String> tablenames = new ArrayList<String>(); while(rs.next()){ String tabname=rs.getString("TABLE_CAT"); tablenames.add(tabname); System.out.println("数据库名字:"+tabname); } System.out.println("--------------");; //拿到某个数据库李曼全部的表名---能够指定表的类型 rs = dbmt.getTables("ake", "ake", null, new String[]{"TABLE","VIEW"}); while(rs.next()){ System.out.println("数据库ake里的表名:"+rs.getString("TABL````` _NAME")); } }

 

 

ResultSetMetaData的使用学习

@Test// ResultSetMetaData 拿到的表结构信息：得到表的列数目 类型和属性 public void ResultSetMetaData_Demo2() throws Exception{ // 本身写的工具包来得到数据库链接 Connection con = ConnUtils4.getConn(); String sql = "select * from ake.book"; Statement st = con.createStatement(); ResultSet rs = st.executeQuery(sql); // ResultSetMetaData 经过 查询的返回集获取 ResultSetMetaData rsmt = rs.getMetaData(); //得到表的列数 int n =rsmt.getColumnCount(); //类型---某一列 // getColumnTypeName:INT //某医疗的名字 // getColumnName:id //某一列的长度 // getColumnDisplaySize:11 for(int i=1;i<n;i++){ System.out.println(rsmt.getTableName(i)+"表的第"+i+"列描述信息"); System.out.println("getColumnDisplaySize:"+rsmt.getColumnDisplaySize(i)); System.out.println("getColumnLabel:"+rsmt.getColumnLabel(i)); System.out.println("getColumnName:"+rsmt.getColumnName(i)); System.out.println("getColumnType:"+rsmt.getColumnType(i)); System.out.println("getColumnTypeName:"+rsmt.getColumnTypeName(i)); System.out.println("getPrecision:"+rsmt.getPrecision(i)); System.out.println("getScale:"+rsmt.getScale(i)); System.out.println("getSchemaName:"+rsmt.getSchemaName(i)); System.out.println("------------"); } con.close(); }

 

拿出ake表里面全部的内容~~~~

// 拿出ake表里面全部的内容~~~~ public static void main(String[] args) throws Exception{ Connection con = ConnUtils4.getConn(); System.out.println(con); DatabaseMetaData dbmt = con.getMetaData(); //拿到全部的ake全部表名 ResultSet rs =dbmt.getTables("ake", "ake", null, new String[]{"TABLE","VIEW"}); List<String> tablenames = new ArrayList<String>(); while(rs.next()){ String tablename = rs.getString("TABLE_NAME"); tablenames.add(tablename); } for(String tablename:tablenames){ System.out.println(tablename+"表："); if(tablename.equals("img")){ continue; } String sql = "select * from ake."+tablename; Statement st = con.createStatement(); ResultSet RS = st.executeQuery(sql); ResultSetMetaData rsmt = RS.getMetaData(); // 拿到列数 int colnums = rsmt.getColumnCount(); for(int i=1;i<=colnums;i++){ //拿到表头信息 String colName = rsmt.getColumnName(i); System.out.print(colName+"\t"); } System.out.println(); while(RS.next()){ for(int i=1;i<=colnums;i++){ //拿到表信息 System.out.print( RS.getString(i)+"\t"); } System.out.println(); } } con.close(); }

 

我把那到的表格信息输出 
 

如何用Java生成Excel表？

须要一个插件工具包 

@Test public void Workbook_demo() throws Exception{ // 创建一个工做表--至关于一个数据库 Workbook book = new HSSFWorkbook(); // 数据库中的一个表 Sheet sheet1 =book.createSheet("表1"); // 行 Row row =sheet1.createRow(4); // 单元格 Cell cell = row.createCell(3); // 写入数据 cell.setCellValue("经过java写的Excel"); // 保存到银盘 book.write( new FileOutputStream("d:a/a.xls")); }

将数据库中的表导出生成Excel案例

public static void main(String[] args) throws Exception { //把数据库里全部的信息导入到Excel表中~ Connection con = ConnUtils4.getConn(); DatabaseMetaData dbmt = con.getMetaData(); //要经过 DatabaseMetaData 拿到全部数据库的名字 List<String> Database_Names = new ArrayList<String>(); ResultSet rs =dbmt.getCatalogs(); while(rs.next()){ Database_Names.add( rs.getString("TABLE_CAT")); } //DatabaseMetaData 拿到全部数据表名 int m = 0; for(String Database_Name:Database_Names){ if(!Database_Name.equals("ake")){ continue; } // if(m++>=3){ // break; // } // 一个数据库对于一个 Excel文档~ Workbook book = new HSSFWorkbook(); rs = dbmt.getTables(Database_Name, Database_Name, null, new String[]{"TABLE","VIEW"}); //封装全部表名 List<String> Table_Names = new ArrayList<String>(); while(rs.next()){ Table_Names.add( rs.getString("TABLE_NAME")); } for(String Table_Name:Table_Names){ if("img".equals(Table_Name) ||"note".equals(Table_Name) ){ // img为二进制文件导入会出错 continue; } //建立一个表 Sheet sheet = book.createSheet(Table_Name); Statement st = con.createStatement(); String sql = "select * from "+Database_Name+"."+Table_Name; // System.out.println("sql:"+sql); rs = st.executeQuery(sql); //设置表头信息 Row row1 = sheet.createRow(0); ResultSetMetaData rsmd = rs.getMetaData(); int colnum = rsmd.getColumnCount(); for(int i=1;i<=colnum;i++){ String name = rsmd.getColumnName(i); Cell cell = row1.createCell(i-1); cell.setCellValue(name); // System.out.print(name+"\t"); } // System.out.println(); //设置表格信息 int idx = 1; while(rs.next()){ Row row = sheet.createRow(idx++); for(int i=1;i<=colnum;i++){ String str = rs.getString(i); // System.out.print(str+"\t"); Cell cell = row.createCell(i-1); cell.setCellValue(str); } // System.out.println(); } } book.write( new FileOutputStream( "d:a/"+Database_Name+".xls")); } }

 

执行结果就成功啦！ 
 
 

/**
     * excel
     * @param request
     * @param resp
     * @throws UnsupportedEncodingException
     */
    @RequestMapping(value = "/exportReceiptReport", method = RequestMethod.GET)
    @ResponseBody
    public void exportReceiptReport(HttpServletRequest request, HttpServletResponse response,JyHTMLpurchaseinfoApiForm form) throws IOException {
        HSSFWorkbook wb = new HSSFWorkbook();
        request.setCharacterEncoding("UTF-8");
        response.setCharacterEncoding("UTF-8");
        response.setContentType("application/x-download");
        Date d = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        String now = sdf.format(d);
        String fileName = "采购"+now+".xls";
        fileName = URLEncoder.encode(fileName, "UTF-8");
        response.addHeader("Content-Disposition", "attachment;filename=" + fileName);
        HSSFSheet sheet = wb.createSheet("sheet1");
        sheet.setDefaultRowHeight((short) (2 * 256));
        HSSFFont font = wb.createFont();
        font.setFontName("宋体");
        font.setFontHeightInPoints((short) 16);
        HSSFRow row = sheet.createRow((int) 0);
        sheet.createRow((int) 1);
        sheet.createRow((int) 2);
        sheet.createRow((int) 3);
        sheet.createRow((int) 4);
        sheet.createRow((int) 5);
        sheet.createRow((int) 6);
        sheet.createRow((int) 7);
        HSSFCellStyle style = wb.createCellStyle();
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER);

        HSSFCell cell = row.createCell(0);
        cell.setCellValue("收货");
        cell.setCellStyle(style);
        cell = row.createCell(1);
        cell.setCellValue("来源");
        cell.setCellStyle(style);
        cell = row.createCell(2);
        cell.setCellValue("入库");
        cell.setCellStyle(style);
        cell = row.createCell(3);
        cell.setCellValue("名称");
        cell.setCellStyle(style);
        cell = row.createCell(4);
        cell.setCellValue("商品名称");
        cell.setCellStyle(style);
        cell = row.createCell(5);
        cell.setCellValue("单位");
        cell.setCellStyle(style);
        cell = row.createCell(6);
        cell.setCellValue("规格");
        cell.setCellStyle(style);
        cell = row.createCell(7);
        cell.setCellValue("数量");
        cell.setCellStyle(style);
        cell = row.createCell(8);
        cell.setCellValue("单价");
        cell.setCellStyle(style);
        cell = row.createCell(9);
        cell.setCellValue("金额");
        cell.setCellStyle(style);
        cell = row.createCell(10);
        cell.setCellValue("用户名称");
        cell.setCellStyle(style);

        List list = SF.JYPURCHASEINFO_SERVICE.exportReceiptReport(form);
        for (int i = 0; i < list.size(); i++) {
            HSSFRow row1 = sheet.createRow(i+1);
            Map<String, Object> map = (Map<String,Object>)list.get(i);
            row1.createCell(0).setCellValue((map.get("receipt_no") != null ? map.get("receipt_no") : "").toString());
            row1.createCell(1).setCellValue((map.get("purchase_no") != null ? map.get("purchase_no") : "").toString());
            row1.createCell(2).setCellValue((map.get("value") != null ? map.get("value") : "").toString());
            row1.createCell(3).setCellValue((map.get("supplier_name") != null ? map.get("supplier_name") : "").toString());
            row1.createCell(4).setCellValue((map.get("packing_name") != null ? map.get("packing_name") : "").toString());
            row1.createCell(5).setCellValue((map.get("purchase_unit") != null ? map.get("purchase_unit") : "").toString());
            row1.createCell(6).setCellValue((map.get("packing_spec") != null ? map.get("packing_spec") : "").toString());
            row1.createCell(7).setCellValue((map.get("boxcount") != null ? map.get("boxcount") : "").toString()+
                    (map.get("packing_unit") != null ? map.get("packing_unit") : "").toString()+
                    (map.get("pingCount") != null ? map.get("pingCount") : "").toString()+
                    (map.get("item_unit") != null ? map.get("item_unit") : "").toString());
            row1.createCell(9).setCellValue((map.get("purchase_price") != null ? map.get("purchase_price") : "").toString());
            row1.createCell(10).setCellValue((map.get("name") != null ? map.get("name") : "").toString());
        }
　　　　　//sheet.autoSizeColumn((short)0); //调整第一列宽度. 　
        try {
            OutputStream out = response.getOutputStream();
            wb.write(out);
            out.flush();
            out.close();
        } catch (ServiceException e) {
            logger.info ("ServiceException=====导出excel异常====" + e);
            e.printStackTrace();
        } catch (Exception e1) {
            logger.info ("Exception=====导出excel异常====" + e1);
            e1.printStackTrace();
        }
    }

 多个excel:

/**
     * 费用结算清单导出:
     */
    @RequestMapping(value = "/exportDealerCosts", method = RequestMethod.GET)
    @ResponseBody
    public void exportDealerCosts(HttpServletRequest request, HttpServletResponse response,JyDealerHomeform form) throws IOException {
        HSSFWorkbook wb = new HSSFWorkbook();
        request.setCharacterEncoding("UTF-8");
        response.setCharacterEncoding("UTF-8");
        response.setContentType("application/x-download");
        Date d = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        String now = sdf.format(d);
        String fileName = "费用结算清单"+now+".xls";
        fileName = URLEncoder.encode(fileName, "UTF-8");
        response.addHeader("Content-Disposition", "attachment;filename=" + fileName);
        //合计
        HSSFSheet sheet = wb.createSheet("费用结算清单");
        sheet.setDefaultRowHeight((short) (2 * 256));
        HSSFFont font = wb.createFont();
        font.setFontName("宋体");
        font.setFontHeightInPoints((short) 16);
        HSSFRow row = sheet.createRow((int) 0);
        sheet.createRow((int) 1);
        sheet.createRow((int) 2);
        sheet.createRow((int) 3);
        sheet.createRow((int) 4);
        sheet.createRow((int) 5);
        sheet.createRow((int) 6);
        sheet.createRow((int) 7);
        HSSFCellStyle style = wb.createCellStyle();
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        HSSFCell cell = row.createCell(0);
        cell.setCellValue("公司名称");
        cell.setCellStyle(style);
        cell = row.createCell(1);
        cell.setCellValue("仓储费");
        cell.setCellStyle(style);
        cell = row.createCell(2);
        cell.setCellValue("配送费");
        cell.setCellStyle(style);
        cell = row.createCell(3);
        cell.setCellValue("回空配送费");
        cell.setCellStyle(style);
        cell = row.createCell(4);
        cell.setCellValue("退货配偶费");
        cell.setCellStyle(style);
        cell = row.createCell(5);
        cell.setCellValue("入出库费");
        cell.setCellStyle(style);
        List dealerCosts = SF.JYDEALER_SERVICE.dealerCosts(form);
        for (int i = 0; i < dealerCosts.size(); i++) {
            HSSFRow row1 = sheet.createRow(i+1);
            Map<String, Object> map = (Map<String,Object>)dealerCosts.get(i);
            row1.createCell(0).setCellValue((map.get("name") != null ? map.get("name") : "").toString());
            row1.createCell(1).setCellValue((map.get("cc_fee") != null ? map.get("cc_fee") : "").toString());
            row1.createCell(2).setCellValue((map.get("ps_fee") != null ? map.get("ps_fee") : "").toString());
            row1.createCell(3).setCellValue((map.get("hkps_fee") != null ? map.get("hkps_fee") : "").toString());
            row1.createCell(4).setCellValue((map.get("thps_fee") != null ? map.get("thps_fee") : "").toString());
            row1.createCell(5).setCellValue((map.get("rc_fee") != null ? map.get("rc_fee") : "").toString());
        }
        
        //仓储费
        HSSFSheet sheet2 = wb.createSheet("仓储费明细");
        sheet2.setDefaultRowHeight((short) (2 * 256));
        HSSFRow row2 = sheet2.createRow((int) 0);
        sheet2.createRow((int) 1);
        sheet2.createRow((int) 2);
        sheet2.createRow((int) 3);
        sheet2.createRow((int) 4);
        sheet2.createRow((int) 5);
        sheet2.createRow((int) 6);
        sheet2.createRow((int) 7);
        HSSFCell cell2 = row2.createCell(0);
        cell2.setCellValue("日期");
        cell2.setCellStyle(style);
        cell2 = row2.createCell(1);
        cell2.setCellValue("公司名称");
        cell2.setCellStyle(style);
        cell2 = row2.createCell(2);
        cell2.setCellValue("商品类型");
        cell2.setCellStyle(style);
        cell2 = row2.createCell(3);
        cell2.setCellValue("商品名称");
        cell2.setCellStyle(style);
        cell2 = row2.createCell(4);
        cell2.setCellValue("库存件数");
        cell2.setCellStyle(style);
        cell2 = row2.createCell(5);
        cell2.setCellValue("总重量");
        cell2.setCellStyle(style);
        cell2 = row2.createCell(6);
        cell2.setCellValue("仓储费");
        cell2.setCellStyle(style);
        List dealerStorageFee = SF.JYDEALER_SERVICE.dealerStorageFee(form);
        for (int i = 0; i < dealerStorageFee.size(); i++) {
            HSSFRow row1 = sheet2.createRow(i+1);
            Map<String, Object> map = (Map<String,Object>)dealerStorageFee.get(i);
            row1.createCell(0).setCellValue((map.get("calendarDate") != null ? map.get("calendarDate") : "").toString());
            row1.createCell(1).setCellValue((map.get("dealerName") != null ? map.get("dealerName") : "").toString());
            row1.createCell(2).setCellValue((map.get("itemType") != null ? map.get("itemType") : "").toString());
            row1.createCell(3).setCellValue((map.get("packingName") != null ? map.get("packingName") : "").toString());
            row1.createCell(4).setCellValue((map.get("packingQty") != null ? map.get("packingQty") : "").toString());
            row1.createCell(5).setCellValue((map.get("totalWeight") != null ? map.get("totalWeight") : "").toString());
            row1.createCell(6).setCellValue((map.get("totalAmount") != null ? map.get("totalAmount") : "").toString());
        }
        
        //配送费
        HSSFSheet sheet3 = wb.createSheet("配送费明细");
        sheet3.setDefaultRowHeight((short) (2 * 256));
        HSSFRow row3 = sheet3.createRow((int) 0);
        sheet3.createRow((int) 1);
        sheet3.createRow((int) 2);
        sheet3.createRow((int) 3);
        sheet3.createRow((int) 4);
        sheet3.createRow((int) 5);
        sheet3.createRow((int) 6);
        sheet3.createRow((int) 7);
        HSSFCell cell3 = row3.createCell(0);
        cell3.setCellValue("日期");
        cell3.setCellStyle(style);
        cell3 = row3.createCell(1);
        cell3.setCellValue("公司名称");
        cell3.setCellStyle(style);
        cell3 = row3.createCell(2);
        cell3.setCellValue("费用区分");
        cell3.setCellStyle(style);
        cell3 = row3.createCell(3);
        cell3.setCellValue("费项");
        cell3.setCellStyle(style);
        cell3 = row3.createCell(4);
        cell3.setCellValue("金额");
        cell3.setCellStyle(style);
        cell3 = row3.createCell(5);
        cell3.setCellValue("客户");
        cell3.setCellStyle(style);
        cell3 = row3.createCell(6);
        cell3.setCellValue("结算对象");
        cell3.setCellStyle(style);
        cell3 = row3.createCell(7);
        cell3.setCellValue("订单编号");
        cell3.setCellStyle(style);
        cell3 = row3.createCell(8);
        cell3.setCellValue("送货件数");
        cell3.setCellStyle(style);
        cell3 = row3.createCell(9);
        cell3.setCellValue("总重量");
        cell3.setCellStyle(style);
        cell3 = row3.createCell(10);
        cell3.setCellValue("送货单号");
        cell3.setCellStyle(style);
        cell3 = row3.createCell(11);
        cell3.setCellValue("配送方式");
        cell3.setCellStyle(style);
        List dealerDeliverFee = SF.JYDEALER_SERVICE.dealerDeliverFee(form);
        for (int i = 0; i < dealerDeliverFee.size(); i++) {
            HSSFRow row1 = sheet3.createRow(i+1);
            Map<String, Object> map = (Map<String,Object>)dealerDeliverFee.get(i);
            row1.createCell(0).setCellValue((map.get("confirm_date") != null ? map.get("confirm_date") : "").toString());
            row1.createCell(1).setCellValue((map.get("name") != null ? map.get("name") : "").toString());
            row1.createCell(2).setCellValue((map.get("fee_type_name") != null ? map.get("fee_type_name") : "").toString());
            row1.createCell(3).setCellValue((map.get("calculate_subject") != null ? map.get("calculate_subject") : "").toString());
            row1.createCell(4).setCellValue((map.get("out_amount") != null ? map.get("out_amount") : "").toString());
            row1.createCell(5).setCellValue((map.get("customer_name") != null ? map.get("customer_name") : "").toString());
            row1.createCell(6).setCellValue((map.get("source_type_name") != null ? map.get("source_type_name") : "").toString());
            row1.createCell(7).setCellValue((map.get("source_order_no") != null ? map.get("source_order_no") : "").toString());
            row1.createCell(8).setCellValue((map.get("box_count") != null ? map.get("box_count") : "").toString());
            row1.createCell(9).setCellValue((map.get("weight") != null ? map.get("weight") : "").toString());
            row1.createCell(10).setCellValue((map.get("deliver_no") != null ? map.get("deliver_no") : "").toString());
            row1.createCell(11).setCellValue((map.get("value") != null ? map.get("value") : "").toString());
        }
        
        //回空配送费
        HSSFSheet sheet4 = wb.createSheet("回空配送费明细");
        sheet4.setDefaultRowHeight((short) (2 * 256));
        HSSFRow row4 = sheet4.createRow((int) 0);
        sheet4.createRow((int) 1);
        sheet4.createRow((int) 2);
        sheet4.createRow((int) 3);
        sheet4.createRow((int) 4);
        sheet4.createRow((int) 5);
        sheet4.createRow((int) 6);
        sheet4.createRow((int) 7);
        HSSFCell cell4 = row4.createCell(0);
        cell4.setCellValue("日期");
        cell4.setCellStyle(style);
        cell4 = row4.createCell(1);
        cell4.setCellValue("公司名称");
        cell4.setCellStyle(style);
        cell4 = row4.createCell(2);
        cell4.setCellValue("回空品名称");
        cell4.setCellStyle(style);
        cell4 = row4.createCell(3);
        cell4.setCellValue("费用区分");
        cell4.setCellStyle(style);
        cell4 = row4.createCell(4);
        cell4.setCellValue("费项");
        cell4.setCellStyle(style);
        cell4 = row4.createCell(5);
        cell4.setCellValue("金额");
        cell4.setCellStyle(style);
        cell4 = row4.createCell(6);
        cell4.setCellValue("收货单号");
        cell4.setCellStyle(style);
        cell4 = row4.createCell(7);
        cell4.setCellValue("客户");
        cell4.setCellStyle(style);
        cell4 = row4.createCell(8);
        cell4.setCellValue("结算对象");
        cell4.setCellStyle(style);
        cell4 = row4.createCell(9);
        cell4.setCellValue("销售单号");
        cell4.setCellStyle(style);
        cell4 = row4.createCell(10);
        cell4.setCellValue("回空件数");
        cell4.setCellStyle(style);
        cell4 = row4.createCell(11);
        cell4.setCellValue("送货单号");
        cell4.setCellStyle(style);
        
        List dealerBackDeliverFee = SF.JYDEALER_SERVICE.dealerBackDeliverFee(form);
        for (int i = 0; i < dealerBackDeliverFee.size(); i++) {
            HSSFRow row1 = sheet4.createRow(i+1);
            Map<String, Object> map = (Map<String,Object>)dealerBackDeliverFee.get(i);
            row1.createCell(0).setCellValue((map.get("confirm_date") != null ? map.get("confirm_date") : "").toString());
            row1.createCell(1).setCellValue((map.get("name") != null ? map.get("name") : "").toString());
            row1.createCell(2).setCellValue((map.get("item_name") != null ? map.get("item_name") : "").toString());
            row1.createCell(3).setCellValue((map.get("fee_type_name") != null ? map.get("fee_type_name") : "").toString());
            row1.createCell(4).setCellValue((map.get("calculate_subject") != null ? map.get("calculate_subject") : "").toString());
            row1.createCell(5).setCellValue((map.get("detail_amount") != null ? map.get("detail_amount") : "").toString());
            row1.createCell(6).setCellValue((map.get("source_order_no") != null ? map.get("source_order_no") : "").toString());
            row1.createCell(7).setCellValue((map.get("customer_name") != null ? map.get("customer_name") : "").toString());
            row1.createCell(8).setCellValue((map.get("source_type_name") != null ? map.get("source_type_name") : "").toString());
            row1.createCell(9).setCellValue((map.get("sales_no") != null ? map.get("sales_no") : "").toString());
            row1.createCell(10).setCellValue((map.get("receipt_box") != null ? map.get("receipt_box") : "").toString());
            row1.createCell(11).setCellValue((map.get("deliver_no") != null ? map.get("deliver_no") : "").toString());
        }
        
        //退货配送费
        HSSFSheet sheet5 = wb.createSheet("退货配送费明细");
        sheet5.setDefaultRowHeight((short) (2 * 256));
        HSSFRow row5 = sheet5.createRow((int) 0);
        sheet5.createRow((int) 1);
        sheet5.createRow((int) 2);
        HSSFCell cell5 = row5.createCell(0);
        cell5.setCellValue("日期");
        cell5.setCellStyle(style);
        cell5 = row5.createCell(1);
        cell5.setCellValue("公司名称");
        cell5.setCellStyle(style);
        cell5 = row5.createCell(2);
        cell5.setCellValue("商品名称");
        cell5.setCellStyle(style);
        cell5 = row5.createCell(3);
        cell5.setCellValue("费用区分");
        cell5.setCellStyle(style);
        cell5 = row5.createCell(4);
        cell5.setCellValue("费项");
        cell5.setCellStyle(style);
        cell5 = row5.createCell(5);
        cell5.setCellValue("金额");
        cell5.setCellStyle(style);
        cell5 = row5.createCell(6);
        cell5.setCellValue("收货单号");
        cell5.setCellStyle(style);
        cell5 = row5.createCell(7);
        cell5.setCellValue("客户");
        cell5.setCellStyle(style);
        cell5 = row5.createCell(8);
        cell5.setCellValue("结算对象");
        cell5.setCellStyle(style);
        cell5 = row5.createCell(9);
        cell5.setCellValue("销售单号");
        cell5.setCellStyle(style);
        cell5 = row5.createCell(10);
        cell5.setCellValue("退货件数");
        cell5.setCellStyle(style);
        cell5 = row5.createCell(11);
        cell5.setCellValue("总重量");
        cell5.setCellStyle(style);
        cell5 = row5.createCell(12);
        cell5.setCellValue("送货单号");
        cell5.setCellStyle(style);
        
        List dealerReturnDeliverFee = SF.JYDEALER_SERVICE.dealerReturnDeliverFee(form);
        for (int i = 0; i < dealerReturnDeliverFee.size(); i++) {
            HSSFRow row1 = sheet5.createRow(i+1);
            Map<String, Object> map = (Map<String,Object>)dealerReturnDeliverFee.get(i);
            row1.createCell(0).setCellValue((map.get("confirm_date") != null ? map.get("confirm_date") : "").toString());
            row1.createCell(1).setCellValue((map.get("name") != null ? map.get("name") : "").toString());
            row1.createCell(2).setCellValue((map.get("packing_name") != null ? map.get("packing_name") : "").toString());
            row1.createCell(3).setCellValue((map.get("fee_type_name") != null ? map.get("fee_type_name") : "").toString());
            row1.createCell(4).setCellValue((map.get("calculate_subject") != null ? map.get("calculate_subject") : "").toString());
            row1.createCell(5).setCellValue((map.get("detail_amount") != null ? map.get("detail_amount") : "").toString());
            row1.createCell(6).setCellValue((map.get("source_order_no") != null ? map.get("source_order_no") : "").toString());
            row1.createCell(7).setCellValue((map.get("customer_name") != null ? map.get("customer_name") : "").toString());
            row1.createCell(8).setCellValue((map.get("source_type_name") != null ? map.get("source_type_name") : "").toString());
            row1.createCell(9).setCellValue((map.get("sales_no") != null ? map.get("sales_no") : "").toString());
            row1.createCell(10).setCellValue((map.get("receipt_box") != null ? map.get("receipt_box") : "").toString());
            row1.createCell(11).setCellValue((map.get("detail_weight") != null ? map.get("detail_weight") : "").toString());
            row1.createCell(12).setCellValue((map.get("deliver_no") != null ? map.get("deliver_no") : "").toString());
        }
        
        //入出库费
        HSSFSheet sheet6 = wb.createSheet("入出库费明细");
        sheet6.setDefaultRowHeight((short) (2 * 256));
        HSSFRow row6 = sheet6.createRow((int) 0);
        sheet6.createRow((int) 1);
        sheet6.createRow((int) 2);
        HSSFCell cell6 = row6.createCell(0);
        cell6.setCellValue("日期");
        cell6.setCellStyle(style);
        cell6 = row6.createCell(1);
        cell6.setCellValue("公司名称");
        cell6.setCellStyle(style);
        cell6 = row6.createCell(2);
        cell6.setCellValue("费用区分");
        cell6.setCellStyle(style);
        cell6 = row6.createCell(3);
        cell6.setCellValue("费项");
        cell6.setCellStyle(style);
        cell6 = row6.createCell(4);
        cell6.setCellValue("结算对象");
        cell6.setCellStyle(style);
        cell6 = row6.createCell(5);
        cell6.setCellValue("收货单号");
        cell6.setCellStyle(style);
        cell6 = row6.createCell(6);
        cell6.setCellValue("对应商品");
        cell6.setCellStyle(style);
        cell6 = row6.createCell(7);
        cell6.setCellValue("件数");
        cell6.setCellStyle(style);
        cell6 = row6.createCell(8);
        cell6.setCellValue("计算重量");
        cell6.setCellStyle(style);
        cell6 = row6.createCell(9);
        cell6.setCellValue("费用");
        cell6.setCellStyle(style);
        cell6 = row6.createCell(10);
        cell6.setCellValue("入库类型");
        cell6.setCellStyle(style);
        
        List dealerInoutFee = SF.JYDEALER_SERVICE.dealerInoutFee(form);
        for (int i = 0; i < dealerInoutFee.size(); i++) {
            HSSFRow row1 = sheet6.createRow(i+1);
            Map<String, Object> map = (Map<String,Object>)dealerInoutFee.get(i);
            row1.createCell(0).setCellValue((map.get("confirm_date") != null ? map.get("confirm_date") : "").toString());
            row1.createCell(1).setCellValue((map.get("name") != null ? map.get("name") : "").toString());
            row1.createCell(2).setCellValue((map.get("fee_type_name") != null ? map.get("fee_type_name") : "").toString());
            row1.createCell(3).setCellValue((map.get("calculate_subject") != null ? map.get("calculate_subject") : "").toString());
            row1.createCell(4).setCellValue((map.get("source_type_name") != null ? map.get("source_type_name") : "").toString());
            row1.createCell(5).setCellValue((map.get("source_order_no") != null ? map.get("source_order_no") : "").toString());
            row1.createCell(6).setCellValue((map.get("packing_name") != null ? map.get("packing_name") : "").toString());
            row1.createCell(7).setCellValue((map.get("receipt_box") != null ? map.get("receipt_box") : "").toString());
            row1.createCell(8).setCellValue((map.get("detail_weight") != null ? map.get("detail_weight") : "").toString());
            row1.createCell(9).setCellValue((map.get("detail_amount") != null ? map.get("detail_amount") : "").toString());
            row1.createCell(10).setCellValue((map.get("receipt_type") != null ? map.get("receipt_type") : "").toString());
        }
        try {
            OutputStream out = response.getOutputStream();
            wb.write(out);
            out.flush();
            out.close();
        } catch (ServiceException e) {
            logger.info("ServiceException=====导出excel异常====" + e);
        } catch (Exception e1) {
            logger.info("Exception=====导出excel异常====" + e1);
        }
    }

 就是excel出来一行合并行 xxx年xx月xx日下面是内容

HSSFRow rowA = sheet.createRow((int) 0);
sheet.createRow((int) 1);
sheet.createRow((int) 2);
sheet.createRow((int) 3);
sheet.createRow((int) 4);
sheet.createRow((int) 5);
sheet.createRow((int) 6);
sheet.createRow((int) 7);
HSSFCellStyle style = wb.createCellStyle();
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);

HSSFCell cell = rowA.createCell(0);
cell.setCellValue("库存:"+form.getBeginDate()+"起至"+form.getEndDate()+"");
cell.setCellStyle(style);
cell = rowA.createCell(1);
cell.setCellValue("");
cell.setCellStyle(style);
cell = rowA.createCell(2);
cell.setCellValue("");
cell.setCellStyle(style);
cell = rowA.createCell(3);
cell.setCellValue("");
cell.setCellStyle(style);
cell = rowA.createCell(4);
cell.setCellValue("");
cell.setCellStyle(style);
cell = rowA.createCell(5);
cell.setCellValue("");
cell.setCellStyle(style);
cell = rowA.createCell(6);
cell.setCellValue("");
cell.setCellStyle(style);
cell = rowA.createCell(7);
cell.setCellValue("");
cell.setCellStyle(style);

// 合并单元格
CellRangeAddress cra =new CellRangeAddress(0, 0, 0, 10); // 起始行, 终止行, 起始列, 终止列
sheet.addMergedRegion(cra);

  合并单元格后居中

 style = wb.createCellStyle();
style.setAlignment(XSSFCellStyle.ALIGN_CENTER);