Apache POI：如何添加對角邊框

Question

我想用Apache POI來繪製Diagonal Border，但我找不到任何可以支持該功能的功能。

我想這setBorderDiagonal，但它無法正常工作。

XSSFSheetConditionalFormatting my_cond_format_layer = my_sheet.getSheetConditionalFormatting(); 

XSSFConditionalFormattingRule my_rule = my_cond_format_layer.createConditionalFormattingRule(ComparisonOperator.BETWEEN, "14", "16"); 
XSSFConditionalFormattingRule my_rule_2 = my_cond_format_layer.createConditionalFormattingRule(ComparisonOperator.EQUAL, "33"); 
XSSFPatternFormatting fill_pattern_2 = my_rule_2.createPatternFormatting(); 
fill_pattern_2.setFillBackgroundColor(IndexedColors.YELLOW.getIndex()); 

XSSFBorderFormatting borderFormatting = my_rule_2.createBorderFormatting(); 
borderFormatting.setDiagonalBorderColor(IndexedColors.BLUE.getIndex()); 
borderFormatting.setBorderDiagonal(BorderFormatting.BORDER_THICK); 

ConditionalFormattingRule[] multiple_rules = {my_rule, my_rule_2}; 
CellRangeAddress[] my_data_range = {CellRangeAddress.valueOf("A1:A4")}; 
my_cond_format_layer.addConditionalFormatting(my_data_range, multiple_rules); 

Answer 1

我不知道爲什麼沒有在XSSFCellStyle一個setBorderDiagonal直到現在。但如果我們看看其他setBorder...方法的代碼，那麼我們可以製作我們自己的setBorderDiagonal。

例子：

import org.apache.poi.ss.usermodel.*; 
import org.apache.poi.xssf.usermodel.*; 

import org.apache.poi.xssf.usermodel.extensions.XSSFCellBorder; 

import org.apache.poi.xssf.model.StylesTable; 
import org.apache.poi.xssf.model.ThemesTable; 
import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTXf; 
import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTBorder; 
import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTBorderPr; 

import org.openxmlformats.schemas.spreadsheetml.x2006.main.STBorderStyle; 

import java.io.FileOutputStream; 
import java.io.IOException; 


class CellDiagonalBorders { 

private static CTBorder getCTBorder(StylesTable _stylesSource, CTXf _cellXf){ 
    CTBorder ct; 
    if(_cellXf.getApplyBorder()) { 
    int idx = (int)_cellXf.getBorderId(); 
    XSSFCellBorder cf = _stylesSource.getBorderAt(idx); 
    ct = (CTBorder)cf.getCTBorder().copy(); 
    } else { 
    ct = CTBorder.Factory.newInstance(); 
    } 
    return ct; 
} 

public static void setBorderDiagonal(short border, StylesTable _stylesSource, CTXf _cellXf , ThemesTable _theme) { 
    CTBorder ct = getCTBorder(_stylesSource, _cellXf); 
    CTBorderPr pr = ct.isSetDiagonal() ? ct.getDiagonal() : ct.addNewDiagonal(); 
    if(border == BorderFormatting.BORDER_NONE) { 
    ct.unsetDiagonal(); 
    } 
    else { 
    ct.setDiagonalDown(true); 
    ct.setDiagonalUp(true); 
    pr.setStyle(STBorderStyle.Enum.forInt(border + 1)); 
    } 
    int idx = _stylesSource.putBorder(new XSSFCellBorder(ct, _theme));  
    _cellXf.setBorderId(idx); 
    _cellXf.setApplyBorder(true); 
} 

public static void main(String[] args) { 
    try { 

    Workbook wb = new XSSFWorkbook(); 

    Sheet sheet = wb.createSheet("Sheet1"); 
    Cell cell = sheet.createRow(2).createCell(2); 

    CellStyle style = wb.createCellStyle(); 

    StylesTable _stylesSource = ((XSSFWorkbook)wb).getStylesSource(); 
    ThemesTable _theme = _stylesSource.getTheme(); 
    CTXf _cellXf = ((XSSFCellStyle)style).getCoreXf(); 

    setBorderDiagonal(BorderFormatting.BORDER_THICK, _stylesSource, _cellXf, _theme); 

    cell.setCellStyle(style); 

    FileOutputStream fileOut = new FileOutputStream("CellDiagonalBorders.xlsx"); 
    wb.write(fileOut); 

    } catch (IOException ioex) { 
    } 
} 
} 

編輯2018年2月23日： 以上代碼爲apache poi以前的版本中工作過。以下代碼在實際最新穩定版本中運行：3.17：

import org.apache.poi.ss.usermodel.*; 
import org.apache.poi.xssf.usermodel.*; 
import org.apache.poi.xssf.streaming.*; 

import org.apache.poi.xssf.usermodel.extensions.XSSFCellBorder; 

import org.apache.poi.xssf.model.StylesTable; 
import org.apache.poi.xssf.model.ThemesTable; 
import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTXf; 
import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTBorder; 
import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTBorderPr; 

import org.openxmlformats.schemas.spreadsheetml.x2006.main.STBorderStyle; 

import java.io.FileOutputStream; 
import java.io.IOException; 


class CellDiagonalBorders { 

private static CTBorder getCTBorder(StylesTable _stylesSource, CTXf _cellXf) { 
    CTBorder ct; 
    if(_cellXf.getApplyBorder()) { 
    int idx = (int)_cellXf.getBorderId(); 
    XSSFCellBorder cf = _stylesSource.getBorderAt(idx); 
    ct = (CTBorder)cf.getCTBorder().copy(); 
    } else { 
    ct = CTBorder.Factory.newInstance(); 
    } 
    return ct; 
} 

public static void setBorderDiagonal(BorderStyle border, StylesTable _stylesSource, CTXf _cellXf, ThemesTable _theme) { 
    CTBorder ct = getCTBorder(_stylesSource, _cellXf); 
    CTBorderPr pr = ct.isSetDiagonal() ? ct.getDiagonal() : ct.addNewDiagonal(); 
    if(border == BorderStyle.NONE) { 
    ct.unsetDiagonal(); 
    } 
    else { 
    ct.setDiagonalDown(true); 
    ct.setDiagonalUp(true); 
    pr.setStyle(STBorderStyle.Enum.forInt(border.getCode() + 1)); 
    } 
    int idx = _stylesSource.putBorder(new XSSFCellBorder(ct, _theme, _stylesSource.getIndexedColors()));  
    _cellXf.setBorderId(idx); 
    _cellXf.setApplyBorder(true); 
} 

public static void main(String[] args) throws Exception { 
    //Workbook wb = new XSSFWorkbook(); 
    Workbook wb = new SXSSFWorkbook(SXSSFWorkbook.DEFAULT_WINDOW_SIZE); 

    CellStyle style = wb.createCellStyle(); 
    style.setBorderTop(BorderStyle.THICK); 
    style.setBorderBottom(BorderStyle.THICK); 

    StylesTable _stylesSource = null; 
    if (wb instanceof SXSSFWorkbook) { 
    _stylesSource = ((SXSSFWorkbook)wb).getXSSFWorkbook().getStylesSource(); 
    } else if (wb instanceof XSSFWorkbook) { 
    _stylesSource = ((XSSFWorkbook)wb).getStylesSource(); 
    } 
    if (_stylesSource != null) { 
    ThemesTable _theme = _stylesSource.getTheme(); 
    CTXf _cellXf = ((XSSFCellStyle)style).getCoreXf(); 
    setBorderDiagonal(BorderStyle.DOUBLE, _stylesSource, _cellXf, _theme); 
    } 

    style.setBorderLeft(BorderStyle.THICK); 
    style.setBorderRight(BorderStyle.THICK); 

    Sheet sheet = wb.createSheet("Sheet1"); 

    for (int r = 1; r < 1000; r++) { 
    Cell cell = sheet.createRow(r).createCell(2); 
    cell.setCellStyle(style); 
    } 

    FileOutputStream fileOut = new FileOutputStream("CellDiagonalBorders.xlsx"); 
    wb.write(fileOut); 
    wb.close(); 
    if (wb instanceof SXSSFWorkbook) ((SXSSFWorkbook)wb).dispose(); 

} 
}