.

src/com/lxyer/excel/poi/ExcelKit.java

@@ -43,7 +43,7 @@ public class ExcelKit {
      * @author LiangXianYou
      * @date 2015-6-16 下午5:56:56
      */
-    //map:data,sheetName,hds,hdNames,xlsName;
+    //map:data,sheetName,hds,hdNames,
     public static <T> Workbook exportExcels(List<Map<String, Object>> list) throws Exception {
 
         Workbook wb = new XSSFWorkbook();            //创建工作薄
@@ -64,12 +64,7 @@ public class ExcelKit {
             @SuppressWarnings("unchecked")
             List<T> data = (List<T>) map.get("data");
             String[] hds = (String[]) map.get("hds");
-            for (int j = 0; j < data.size(); j++) {
+            dataToSheet(sheet, data, hds, 1);
-                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 wb;
@@ -100,38 +95,28 @@ public class ExcelKit {
     }
 
     /**
-     * 参数说明：
+     * 使用数据构建 excel 工作薄对象
-     * list：list数据集合
+     * @param list    数据
-     * hdNames：表头需要显示的名称
+     * @param hdNames 表头
-     * hds：表头对应的对象属性名称，和 hdNames一一对应
+     * @param hds     每条记录中数据的属性名
-     * xlsName：导出Excel的预定义名称
+     * @param <T>     数据泛型，支持javaBean 或Map
-     * request:	HttpServletRequest
+     * @return
-     * response：HttpServletResponse
-     * 通过数据构建Excel
-     *
      * @throws Exception
      * @author LiangXianYou
      * @date 2015-3-13 上午11:00:30
      */
     public static <T> Workbook exportExcel(List<T> list, String[] hdNames, String[] hds) throws Exception {
 
-        Workbook wb = new XSSFWorkbook();            //创建工作薄
+        Workbook wb = new XSSFWorkbook();
-        Sheet sheet = wb.createSheet();                //创建工作表
+        Sheet sheet = wb.createSheet();
-        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
+        Row nRow = sheet.createRow(0);
         for (int i = 0; i < hdNames.length; i++) {
-            Cell nCell = nRow.createCell(i);            //创建单元格
+            Cell nCell = nRow.createCell(i);
             nCell.setCellValue(hdNames[i]);
         }
 
-        //写入每一行数据---一条记录就是一行数据
+        dataToSheet(sheet, list, hds, 1);
-        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 wb;
     }
 
@@ -148,11 +133,11 @@ public class ExcelKit {
         if (t == null) {
             v = null;
         } else if (t instanceof Map) {
-            v = ((Map) t).get(fieldName); //得到列的值
+            v = ((Map) t).get(fieldName);
         } else {
             Field field = t.getClass().getDeclaredField(fieldName);
-            field.setAccessible(true); //暴力反射
+            field.setAccessible(true);
-            v = field.get(t); //得到字段数据的值
+            v = field.get(t);
         }
 
         return v;
@@ -164,24 +149,38 @@ public class ExcelKit {
      * @author LiangXianYou
      * @date 2015-3-13 上午10:37:55
      */
-    private static void data2Excel(Sheet sheet, Object o, Integer r, Integer c) {
+    private static <T> void dataToSheet(Sheet sheet, List<T> list, String[] hds, int skipRow) {
-        //通过获得sheet中的某一列，有得到，没有创建
+        if (list == null || list.size() == 0) return;
-        Row nRow = sheet.getRow(r);
-        if (nRow == null) {
-            nRow = sheet.createRow(r);
-        }
-        Cell nCell = nRow.createCell(c);
 
+        for (int j = 0; j < list.size(); j++) {
+            for (int k = 0; k < hds.length; k++) {
+                Row nRow = sheet.getRow(j + skipRow);
+                if (nRow == null) {
+                    nRow = sheet.createRow(j + 1);
+                }
+                Cell cell = nRow.createCell(k);
+
+                try {
+                    Object v = getFieldValue(list.get(j), hds[k]);    //得到列的值
+                    dataToCell(cell, v);                    //将值写入Excel
+                } catch (Exception e) {
+                    e.printStackTrace();
+                }
+            }
+        }
+    }
+
+    private static void dataToCell(Cell cell, Object v) {
         //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
-        if (o instanceof Integer) nCell.setCellValue((Integer) o);
+        if (v instanceof Integer) cell.setCellValue((Integer) v);
-        else if (o instanceof Double) nCell.setCellValue((Double) o);
+        else if (v instanceof Double) cell.setCellValue((Double) v);
-        else if (o instanceof Float) nCell.setCellValue((Float) o);
+        else if (v instanceof Float) cell.setCellValue((Float) v);
-        else if (o instanceof String) nCell.setCellValue((String) o);
+        else if (v instanceof String) cell.setCellValue((String) v);
-        else if (o instanceof Date) nCell.setCellValue(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(o));
+        else if (v instanceof Date) cell.setCellValue(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(v));
-        else if (o instanceof Calendar) nCell.setCellValue((Calendar) o);
+        else if (v instanceof Calendar) cell.setCellValue((Calendar) v);
-        else if (o instanceof Boolean) nCell.setCellValue((Boolean) o);
+        else if (v instanceof Boolean) cell.setCellValue((Boolean) v);
-        else if (o == null) nCell.setCellValue("");
+        else if (v == null) cell.setCellValue("");
-        else nCell.setCellValue(o + "");
+        else cell.setCellValue(v + "");
     }
 
     //======================= 读取excel ===============================