package com.newflyig.jpg;/*** width:pix=getColumnWidthInPixels*1.15* height:pix=getHeightInPoints*96/72* * 本示例用来读取Excel报表文件，并力图将报表无差别转化成PNG图片* 使用POI读取Excel各项数据* 使用JAVA 2D绘制PNG* TODO 本示例基本实现了常见Excel的所有样式输出，但Office2007以后的版本添加了条件样式功能，因为POI的API无法读取条件样式，所以无法实现* 今后可以通过关键字标注等方法，在Excel中需要加入条件样式的单元格用注解标明，使用JAVA计算得出样式再绘制出来*/import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.List;import javax.imageio.ImageIO;import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Sheet;
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.xssf.usermodel.XSSFFont;import sun.awt.SunHints;public class DrawFromExcel {public static void main(String[] args) throws Exception {// 给定两个初始值，标志出导出区域，两个行列组合的单元格int[] fromIndex = { 0, 0 };int[] toIndex = { 17, 20 };int imageWidth = 0;int imageHeight = 0;Workbook wb = WorkbookFactory.create(new File("d:/2014年1月营销活动报表140116.xlsx"));Sheet sheet = wb.getSheet("test");List<CellRangeAddress> rangeAddress = sheet.getMergedRegions(); // 获取整个sheet中合并单元格组合的集合// 首先做初步的边界检测，如果指定区域是不合法的则抛出异常int rowSum = sheet.getPhysicalNumberOfRows();int colSum = sheet.getRow(0).getPhysicalNumberOfCells();if (fromIndex[0] > rowSum || fromIndex[0] > toIndex[0] || toIndex[0] > rowSum) {throw new Exception("the rowIndex of the area is wrong!");}if (fromIndex[1] > colSum || fromIndex[1] > toIndex[1] || toIndex[1] > colSum) {throw new Exception("the colIndex of the area is wrong!");}// 计算实际需要载入内存的二维Cell数组的大小，剔除隐藏行列int rowSize = toIndex[0]+1;int colSize = toIndex[1]+1;// 遍历需要扫描的区域UserCell[][] cells = new UserCell[rowSize][colSize];int[] rowPixPos = new int[rowSize + 1];rowPixPos[0] = 0;int[] colPixPos = new int[colSize + 1];colPixPos[0] = 0;for (int i = 0; i < rowSize; i++) {for (int j = 0; j < colSize; j++) {cells[i][j] = new UserCell();cells[i][j].setCell(sheet.getRow(i).getCell(j));cells[i][j].setRow(i);cells[i][j].setCol(j);boolean ifShow=(i>=fromIndex[0]) && (j>=fromIndex[1]);  //首先行列要在指定区域之间ifShow=ifShow && !(sheet.isColumnHidden(j) || sheet.getRow(i).getZeroHeight());  //其次行列不可以隐藏cells[i][j].setShow(ifShow);// 计算所求区域宽度float widthPix = !ifShow ? 0 : sheet.getColumnWidthInPixels(j); // 如果该单元格是隐藏的，则置宽度为0if (i == fromIndex[0]) {imageWidth += widthPix;}colPixPos[j+1] = (int) (widthPix * 1.15 + colPixPos[j]);}// 计算所求区域高度boolean ifShow=(i>=fromIndex[0]); //行序列在指定区域中间ifShow=ifShow && !sheet.getRow(i).getZeroHeight(); //行序列不能隐藏float heightPoint = !ifShow ? 0 : sheet.getRow(i).getHeightInPoints(); // 如果该单元格是隐藏的，则置高度为0imageHeight += heightPoint;           rowPixPos[i+1] = (int) (heightPoint * 96 / 72) + rowPixPos[i];}imageHeight = imageHeight * 96 / 72;imageWidth = imageWidth * 115 / 100;wb.close();List<Grid> grids = new ArrayList<Grid>();for (int i = 0; i < rowSize; i++) {for (int j = 0; j < colSize; j++) {Grid grid = new Grid();// 设置坐标和宽高grid.setX(colPixPos[j]);grid.setY(rowPixPos[i]);grid.setWidth(colPixPos[j + 1] - colPixPos[j]);grid.setHeight(rowPixPos[i + 1] - rowPixPos[i]);grid.setRow(cells[i][j].getRow());grid.setCol(cells[i][j].getCol());grid.setShow(cells[i][j].isShow());// 判断是否为合并单元格int[] isInMergedStatus = isInMerged(grid.getRow(), grid.getCol(), rangeAddress);if (isInMergedStatus[0] == 0 && isInMergedStatus[1] == 0) {// 此单元格是合并单元格，并且不是第一个单元格，需要跳过本次循环，不进行绘制continue;} else if (isInMergedStatus[0] != -1 && isInMergedStatus[1] != -1) {// 此单元格是合并单元格，并且属于第一个单元格，则需要调整网格大小                   int lastRowPos=isInMergedStatus[0]>rowSize-1?rowSize-1:isInMergedStatus[0];int lastColPos=isInMergedStatus[1]>colSize-1?colSize-1:isInMergedStatus[1];                  grid.setWidth(colPixPos[lastColPos + 1] - colPixPos[j]);grid.setHeight(rowPixPos[lastRowPos + 1] - rowPixPos[i]);}// 单元格背景颜色CellStyle cs = cells[i][j].getCell().getCellStyle();if (cs.getFillPattern() == CellStyle.SOLID_FOREGROUND)grid.setBgColor(cells[i][j].getCell().getCellStyle().getFillForegroundColorColor());// 设置字体org.apache.poi.ss.usermodel.Font font = wb.getFontAt(cs.getFontIndex());grid.setFont(font);// 设置字体前景色if (font instanceof XSSFFont) {XSSFFont xf = (XSSFFont) font;grid.setFtColor(xf.getXSSFColor());}// 设置文本String strCell = "";switch (cells[i][j].getCell().getCellType()) {case HSSFCell.CELL_TYPE_NUMERIC:                                      strCell = String.valueOf(cells[i][j].getCell().getNumericCellValue());break;case HSSFCell.CELL_TYPE_STRING:strCell = cells[i][j].getCell().getStringCellValue();break;case HSSFCell.CELL_TYPE_BOOLEAN:strCell = String.valueOf(cells[i][j].getCell().getBooleanCellValue());break;case HSSFCell.CELL_TYPE_FORMULA:try {strCell = String.valueOf(cells[i][j].getCell().getNumericCellValue());} catch (IllegalStateException e) {strCell = String.valueOf(cells[i][j].getCell().getRichStringCellValue());}break;default:strCell = "";}if(cells[i][j].getCell().getCellStyle().getDataFormatString().contains("0.00%")){try{double dbCell=Double.valueOf(strCell);strCell=new DecimalFormat("#.00").format(dbCell*100)+"%";}catch(NumberFormatException e){}                    }grid.setText(strCell.matches("\\w*\\.0") ? strCell.substring(0, strCell.length() - 2) : strCell);grids.add(grid);}}BufferedImage image = new BufferedImage(imageWidth, imageHeight, BufferedImage.TYPE_INT_RGB);Graphics2D g2d = image.createGraphics();// 平滑字体g2d.setRenderingHint(SunHints.KEY_ANTIALIASING, SunHints.VALUE_ANTIALIAS_OFF);g2d.setRenderingHint(SunHints.KEY_TEXT_ANTIALIASING, SunHints.VALUE_TEXT_ANTIALIAS_DEFAULT);g2d.setRenderingHint(SunHints.KEY_STROKE_CONTROL, SunHints.VALUE_STROKE_DEFAULT);g2d.setRenderingHint(SunHints.KEY_TEXT_ANTIALIAS_LCD_CONTRAST, 140);g2d.setRenderingHint(SunHints.KEY_FRACTIONALMETRICS, SunHints.VALUE_FRACTIONALMETRICS_OFF);g2d.setRenderingHint(SunHints.KEY_RENDERING, SunHints.VALUE_RENDER_DEFAULT);g2d.setColor(Color.white);g2d.fillRect(0, 0, imageWidth, imageHeight);// 绘制表格for (Grid g : grids) {if (!g.isShow())continue;// 绘制背景色g2d.setColor(g.getBgColor() == null ? Color.white : g.getBgColor());g2d.fillRect(g.getX(), g.getY(), g.getWidth(), g.getHeight());// 绘制边框g2d.setColor(Color.black);g2d.setStroke(new BasicStroke(1));g2d.drawRect(g.getX(), g.getY(), g.getWidth(), g.getHeight());// 绘制文字,居中显示g2d.setColor(g.getFtColor());Font font = g.getFont();FontMetrics fm = g2d.getFontMetrics(font);int strWidth = fm.stringWidth(g.getText());// 获取将要绘制的文字宽度g2d.setFont(font);g2d.drawString(g.getText(),g.getX() + (g.getWidth() - strWidth) / 2,g.getY() + (g.getHeight() - font.getSize()) / 2 + font.getSize());}g2d.dispose();ImageIO.write(image, "png", new File("d:/test.png"));System.out.println("Output to PNG file Success!");}/*** 判断Excel中的单元格是否为合并单元格* * @param row* @param col* @param rangeAddress* @return 如果不是合并单元格返回{-1,-1},如果是合并单元格并且是一个单元格返回{lastRow,lastCol},*         如果是合并单元格并且不是第一个格子返回{0,0}*/private static int[] isInMerged(int row, int col, List<CellRangeAddress> rangeAddress) {int[] isInMergedStatus = { -1, -1 };for (CellRangeAddress cra : rangeAddress) {if (row == cra.getFirstRow() && col == cra.getFirstColumn()) {isInMergedStatus[0] = cra.getLastRow();isInMergedStatus[1] = cra.getLastColumn();return isInMergedStatus;}if (row >= cra.getFirstRow() && row <= cra.getLastRow()) {if (col >= cra.getFirstColumn() && col <= cra.getLastColumn()) {isInMergedStatus[0] = 0;isInMergedStatus[1] = 0;return isInMergedStatus;}}}return isInMergedStatus;}
}