sheet cell画斜线
首先初始化HSSFWorkbook对象，通过此对象创建excel的一个名称为"line"的sheet, 下面是通过sheet对象创建单元格。
HSSFWorkbook wb = new HSSFWorkbook();HSSFSheet sheet = wb.createSheet("line");
通过sheet的createRow方法创建table的行，设置行高为77*PXTOPT, 77是像素值转换为poi高需要乘以0.75(PXTOPT),
通过row创建HSSFCell对象，为HSSFCell单元格设置样式。
HSSFRow row = sheet.createRow(0);row.setHeightInPoints(77 * PXTOPT);HSSFCell cell = row.createCell(0);
画第一个单元格3个斜线，x1,y1,x2,y2,x3,y3为线的坐标终止位置，开始坐标是相对于当前的单元格，所以为(0,0), drawLine方法中
i表示sheet， 行数，j表示sheet的列数，width为当前单元格的宽度，height为当前单元格的高度，HSSFClientAnchor 对象是指定在哪个单元格中画线，EscherGraphics2d对象为画笔对象，画线方法 drawLine(0,0, x, y)，x、y为线的终止坐标，PERCENT_WIDTH与PERCENT_HEIGHT变量为excel中单元格宽度与高度换算值，excel中单元格宽度=PERCENT_WIDTH * 0.75 * 像素宽度。
int x1 = 61, y1 = 77;int x2 = 132, y2 = 76;int x3 = 144, y3 = 31;int[] xys = {x1, y1, x2, y2, x3, y3 };drawLine(sheet, row, 0, 0, 144, 77, xys);// draw cell lineprivate static void drawLine(HSSFSheet sheet, HSSFRow row, int i, int j, int width, int height,int[] xys) {int cellWidth = (int) (PERCENT_WIDTH * PXTOPT * width);short cellHeight = (short) (PERCENT_HEIGHT * PXTOPT * height);sheet.setColumnWidth(j, cellWidth);row.setHeight(cellHeight);HSSFPatriarch patriarch = sheet.createDrawingPatriarch();HSSFClientAnchor a = new HSSFClientAnchor(0, 0, 1023, 255, (short) j, i, (short) (j), i);HSSFShapeGroup group = patriarch.createGroup(a);float verticalPointsPerPixel = a.getAnchorHeightInPoints(sheet);EscherGraphics g = new EscherGraphics(group, sheet.getWorkbook(), Color.black,verticalPointsPerPixel);EscherGraphics2d g2d = new EscherGraphics2d(g);for (int l = 0; l < xys.length; l += 2) {int x = (int) ((PERCENT_WIDTH * 0.75 * xys[l] / cellWidth) * 1023);int y = (int) ((PERCENT_HEIGHT * 0.75 * xys[l + 1] / cellHeight) * 255);g2d.drawLine(0, 0, x, y);}}
画最后一个单元格的一个斜线，这是i=1,j=3,第二行第四列单元格，斜线开始坐标为(0,0),终止坐标为(112,83)
int[] xys1 = {112, 83 };drawLine(sheet, row, 1, 3, 110, 83, xys1);
完整示例
下面是输出excel斜线完整的示例代码，使用的poi类库为：poi-3.8.jar
import java.awt.Color;import java.io.FileOutputStream;import org.apache.poi.hssf.usermodel.EscherGraphics;import org.apache.poi.hssf.usermodel.EscherGraphics2d;import org.apache.poi.hssf.usermodel.HSSFCell;import org.apache.poi.hssf.usermodel.HSSFCellStyle;import org.apache.poi.hssf.usermodel.HSSFClientAnchor;import org.apache.poi.hssf.usermodel.HSSFPalette;import org.apache.poi.hssf.usermodel.HSSFPatriarch;import org.apache.poi.hssf.usermodel.HSSFRow;import org.apache.poi.hssf.usermodel.HSSFShapeGroup;import org.apache.poi.hssf.usermodel.HSSFSheet;import org.apache.poi.hssf.usermodel.HSSFWorkbook;public class TestExcel {public static final int PERCENT_WIDTH = 50;public static final int PERCENT_HEIGHT = 20;public static final float PXTOPT = 0.75f;public static void main(String[] args) throws Exception {FileOutputStream fos = new FileOutputStream("D:/line.xls");HSSFWorkbook wb = new HSSFWorkbook();HSSFSheet sheet = wb.createSheet("line");HSSFRow row = sheet.createRow(0);row.setHeightInPoints(77 * PXTOPT);final String text = " AB\n\n\n CD";HSSFCell cell = row.createCell(0);HSSFCellStyle cellStyle = getCellFormat(wb);int x1 = 61, y1 = 77;int x2 = 132, y2 = 76;int x3 = 144, y3 = 31;int[] xys = {x1, y1, x2, y2, x3, y3 };drawLine(sheet, row, 0, 0, 144, 77, xys);cell.setCellValue(text);cellStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_TOP);cell.setCellStyle(cellStyle);cell = row.createCell(1);cell.setCellStyle(cellStyle);cell = row.createCell(2);cell.setCellStyle(cellStyle);cell = row.createCell(3);cell.setCellStyle(cellStyle);row = sheet.createRow(1);row.setHeightInPoints(83 * PXTOPT);cell = row.createCell(0);cell.setCellStyle(cellStyle);cell = row.createCell(1);cell.setCellStyle(cellStyle);cell = row.createCell(2);cell.setCellStyle(cellStyle);cell = row.createCell(3);cell.setCellStyle(cellStyle);int[] xys1 = {112, 83 };drawLine(sheet, row, 1, 3, 110, 83, xys1);wb.write(fos);}// draw cell lineprivate static void drawLine(HSSFSheet sheet, HSSFRow row, int i, int j, int width, int height,int[] xys) {int cellWidth = (int) (PERCENT_WIDTH * PXTOPT * width);short cellHeight = (short) (PERCENT_HEIGHT * PXTOPT * height);sheet.setColumnWidth(j, cellWidth);row.setHeight(cellHeight);HSSFPatriarch patriarch = sheet.createDrawingPatriarch();HSSFClientAnchor a = new HSSFClientAnchor(0, 0, 1023, 255, (short) j, i, (short) (j), i);HSSFShapeGroup group = patriarch.createGroup(a);float verticalPointsPerPixel = a.getAnchorHeightInPoints(sheet);EscherGraphics g = new EscherGraphics(group, sheet.getWorkbook(), Color.black,verticalPointsPerPixel);EscherGraphics2d g2d = new EscherGraphics2d(g);for (int l = 0; l < xys.length; l += 2) {int x = (int) ((PERCENT_WIDTH * 0.75 * xys[l] / cellWidth) * 1023);int y = (int) ((PERCENT_HEIGHT * 0.75 * xys[l + 1] / cellHeight) * 255);g2d.drawLine(0, 0, x, y);}}public static HSSFCellStyle getCellFormat(HSSFWorkbook wb) {HSSFCellStyle cellStyle = wb.createCellStyle();if (cellStyle.getBorderBottom() != HSSFCellStyle.BORDER_THIN) {cellStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);}if (cellStyle.getBorderLeft() != HSSFCellStyle.BORDER_THIN) {cellStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);}if (cellStyle.getBorderTop() != HSSFCellStyle.BORDER_THIN) {cellStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);}if (cellStyle.getBorderRight() != HSSFCellStyle.BORDER_THIN) {cellStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);}cellStyle.setBottomBorderColor(createPette(wb));cellStyle.setLeftBorderColor(createPette(wb));cellStyle.setRightBorderColor(createPette(wb));cellStyle.setTopBorderColor(createPette(wb));return cellStyle;}public static short createPette(HSSFWorkbook wb) {short petteIndex = 0;Color rgb = new Color(0x00, 0x00, 0x00);HSSFPalette palette = wb.getCustomPalette();palette.setColorAtIndex(petteIndex, (byte) rgb.getRed(), (byte) rgb.getGreen(), (byte) rgb.getBlue());return petteIndex;}}
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