Excel注解支持导入导出标题信息

ruoyi-common/ruoyi-common-core/src/main/java/com/ruoyi/common/core/utils/poi/ExcelUtil.java

@@ -36,6 +36,7 @@ import org.apache.poi.ss.usermodel.Sheet;
 import org.apache.poi.ss.usermodel.VerticalAlignment;
 import org.apache.poi.ss.usermodel.Workbook;
 import org.apache.poi.ss.usermodel.WorkbookFactory;
+import org.apache.poi.ss.util.CellRangeAddress;
 import org.apache.poi.ss.util.CellRangeAddressList;
 import org.apache.poi.util.IOUtils;
 import org.apache.poi.xssf.streaming.SXSSFWorkbook;
@@ -103,6 +104,16 @@ public class ExcelUtil<T>
      */
     private List<Object[]> fields;
 
+    /**
+     * 当前行号
+     */
+    private int rownum;
+    
+    /**
+     * 标题
+     */
+    private String title;
+
     /**
      * 最大高度
      */
@@ -128,7 +139,7 @@ public class ExcelUtil<T>
         this.clazz = clazz;
     }
 
-    public void init(List<T> list, String sheetName, Type type)
+    public void init(List<T> list, String sheetName, String title, Type type)
     {
         if (list == null)
         {
@@ -137,8 +148,27 @@ public class ExcelUtil<T>
         this.list = list;
         this.sheetName = sheetName;
         this.type = type;
+        this.title = title;
         createExcelField();
         createWorkbook();
+        createTitle();
+    }
+
+    /**
+     * 创建excel第一行标题
+     */
+    public void createTitle()
+    {
+        if (StringUtils.isNotEmpty(title))
+        {
+            Row titleRow = sheet.createRow(rownum == 0 ? rownum++ : 0);
+            titleRow.setHeightInPoints(30);
+            Cell titleCell = titleRow.createCell(0);
+            titleCell.setCellStyle(styles.get("title"));
+            titleCell.setCellValue(title);
+            sheet.addMergedRegion(new CellRangeAddress(titleRow.getRowNum(), titleRow.getRowNum(), titleRow.getRowNum(),
+                    this.fields.size() - 1));
+        }
     }
 
     /**
@@ -149,33 +179,36 @@ public class ExcelUtil<T>
      */
     public List<T> importExcel(InputStream is) throws Exception
     {
-        return importExcel(StringUtils.EMPTY, is);
+        return importExcel(is, 0);
+    }
+
+    /**
+     * 对excel表单默认第一个索引名转换成list
+     * 
+     * @param is 输入流
+     * @param titleNum 标题占用行数
+     * @return 转换后集合
+     */
+    public List<T> importExcel(InputStream is, int titleNum) throws Exception
+    {
+        return importExcel(StringUtils.EMPTY, is, titleNum);
     }
 
     /**
      * 对excel表单指定表格索引名转换成list
      * 
      * @param sheetName 表格索引名
+     * @param titleNum 标题占用行数
      * @param is 输入流
      * @return 转换后集合
      */
-    public List<T> importExcel(String sheetName, InputStream is) throws Exception
+    public List<T> importExcel(String sheetName, InputStream is, int titleNum) throws Exception
     {
         this.type = Type.IMPORT;
         this.wb = WorkbookFactory.create(is);
         List<T> list = new ArrayList<T>();
-        Sheet sheet = null;
-        if (StringUtils.isNotEmpty(sheetName))
-        {
-            // 如果指定sheet名,则取指定sheet中的内容.
-            sheet = wb.getSheet(sheetName);
-        }
-        else
-        {
-            // 如果传入的sheet名不存在则默认指向第1个sheet.
-            sheet = wb.getSheetAt(0);
-        }
-
+        // 如果指定sheet名,则取指定sheet中的内容 否则默认指向第1个sheet
+        Sheet sheet = StringUtils.isNotEmpty(sheetName) ? wb.getSheet(sheetName) : wb.getSheetAt(0);
         if (sheet == null)
         {
             throw new IOException("文件sheet不存在");
@@ -189,7 +222,7 @@ public class ExcelUtil<T>
             // 定义一个map用于存放excel列的序号和field.
             Map<String, Integer> cellMap = new HashMap<String, Integer>();
             // 获取表头
-            Row heard = sheet.getRow(0);
+            Row heard = sheet.getRow(titleNum);
             for (int i = 0; i < heard.getPhysicalNumberOfCells(); i++)
             {
                 Cell cell = heard.getCell(i);
@@ -222,7 +255,7 @@ public class ExcelUtil<T>
                     }
                 }
             }
-            for (int i = 1; i <= rows; i++)
+            for (int i = titleNum + 1; i <= rows; i++)
             {
                 // 从第2行开始取数据,默认第一行是表头.
                 Row row = sheet.getRow(i);
@@ -331,14 +364,35 @@ public class ExcelUtil<T>
      * @return 结果
      * @throws IOException
      */
-    public void exportExcel(HttpServletResponse response, List<T> list, String sheetName) throws IOException
+    public void exportExcel(HttpServletResponse response, List<T> list, String sheetName)throws IOException
+    {
+        exportExcel(response, list, sheetName, StringUtils.EMPTY);
+    }
+
+    /**
+     * 对list数据源将其里面的数据导入到excel表单
+     * 
+     * @param response 返回数据
+     * @param list 导出数据集合
+     * @param sheetName 工作表的名称
+     * @param title 标题
+     * @return 结果
+     * @throws IOException
+     */
+    public void exportExcel(HttpServletResponse response, List<T> list, String sheetName, String title) throws IOException
     {
         response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
         response.setCharacterEncoding("utf-8");
-        this.init(list, sheetName, Type.EXPORT);
+        this.init(list, sheetName, title, Type.EXPORT);
         exportExcel(response.getOutputStream());
     }
 
+    /**
+     * 对list数据源将其里面的数据导入到excel表单
+     * 
+     * @param sheetName 工作表的名称
+     * @return 结果
+     */
     /**
      * 对list数据源将其里面的数据导入到excel表单
      * 
@@ -346,10 +400,22 @@ public class ExcelUtil<T>
      * @return 结果
      */
     public void importTemplateExcel(HttpServletResponse response, String sheetName) throws IOException
+    {
+        importTemplateExcel(response, sheetName);
+    }
+
+    /**
+     * 对list数据源将其里面的数据导入到excel表单
+     * 
+     * @param sheetName 工作表的名称
+     * @param title 标题
+     * @return 结果
+     */
+    public void importTemplateExcel(HttpServletResponse response, String sheetName, String title) throws IOException
     {
         response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
         response.setCharacterEncoding("utf-8");
-        this.init(null, sheetName, Type.IMPORT);
+        this.init(null, sheetName, title, Type.IMPORT);
         exportExcel(response.getOutputStream());
     }
 
@@ -382,13 +448,13 @@ public class ExcelUtil<T>
     public void writeSheet()
     {
         // 取出一共有多少个sheet.
-        double sheetNo = Math.ceil(list.size() / sheetSize);
-        for (int index = 0; index <= sheetNo; index++)
+        int sheetNo = Math.max(1, (int) Math.ceil(list.size() * 1.0 / sheetSize));
+        for (int index = 0; index < sheetNo; index++)
         {
             createSheet(sheetNo, index);
 
             // 产生一行
-            Row row = sheet.createRow(0);
+            Row row = sheet.createRow(rownum);
             int column = 0;
             // 写入各个字段的列头名称
             for (Object[] os : fields)
@@ -416,7 +482,7 @@ public class ExcelUtil<T>
         int endNo = Math.min(startNo + sheetSize, list.size());
         for (int i = startNo; i < endNo; i++)
         {
-            row = sheet.createRow(i + 1 - startNo);
+            row = sheet.createRow(i + 1 + rownum - startNo);
             // 得到导出对象.
             T vo = (T) list.get(i);
             int column = 0;
@@ -444,6 +510,16 @@ public class ExcelUtil<T>
         CellStyle style = wb.createCellStyle();
         style.setAlignment(HorizontalAlignment.CENTER);
         style.setVerticalAlignment(VerticalAlignment.CENTER);
+        Font titleFont = wb.createFont();
+        titleFont.setFontName("Arial");
+        titleFont.setFontHeightInPoints((short) 16);
+        titleFont.setBold(true);
+        style.setFont(titleFont);
+        styles.put("title", style);
+
+        style = wb.createCellStyle();
+        style.setAlignment(HorizontalAlignment.CENTER);
+        style.setVerticalAlignment(VerticalAlignment.CENTER);
         style.setBorderRight(BorderStyle.THIN);
         style.setRightBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
         style.setBorderLeft(BorderStyle.THIN);
@@ -471,7 +547,7 @@ public class ExcelUtil<T>
         headerFont.setColor(IndexedColors.WHITE.getIndex());
         style.setFont(headerFont);
         styles.put("header", style);
-        
+
         style = wb.createCellStyle();
         style.setAlignment(HorizontalAlignment.CENTER);
         style.setVerticalAlignment(VerticalAlignment.CENTER);
@@ -840,10 +916,9 @@ public class ExcelUtil<T>
     {
         if (statistics.size() > 0)
         {
-            Cell cell = null;
             Row row = sheet.createRow(sheet.getLastRowNum() + 1);
             Set<Integer> keys = statistics.keySet();
-            cell = row.createCell(0);
+            Cell cell = row.createCell(0);
             cell.setCellStyle(styles.get("total"));
             cell.setCellValue("合计");
 
@@ -939,7 +1014,7 @@ public class ExcelUtil<T>
         this.fields = this.fields.stream().sorted(Comparator.comparing(objects -> ((Excel) objects[1]).sort())).collect(Collectors.toList());
         this.maxHeight = getRowHeight();
     }
-    
+
     /**
      * 根据注解获取最大行高
      */
@@ -971,6 +1046,9 @@ public class ExcelUtil<T>
     public void createWorkbook()
     {
         this.wb = new SXSSFWorkbook(500);
+        this.sheet = wb.createSheet();
+        wb.setSheetName(0, sheetName);
+        this.styles = createStyles(wb);
     }
 
     /**
@@ -979,17 +1057,13 @@ public class ExcelUtil<T>
      * @param sheetNo sheet数量
      * @param index 序号
      */
-    public void createSheet(double sheetNo, int index)
+    public void createSheet(int sheetNo, int index)
     {
-        this.sheet = wb.createSheet();
-        this.styles = createStyles(wb);
         // 设置工作表的名称.
-        if (sheetNo == 0)
-        {
-            wb.setSheetName(index, sheetName);
-        }
-        else
+        if (sheetNo > 1 && index > 0)
         {
+            this.sheet = wb.createSheet();
+            this.createTitle();
             wb.setSheetName(index, sheetName + index);
         }
     }