Java使用POI库对excel进行操作

excel转为图片

这个操作是要根据excel一行一行画出来的

package com.gxuwz.zjh.util;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.List;
import javax.imageio.ImageIO;
import com.gxuwz.zjh.entity.Grid;
import com.gxuwz.zjh.entity.UserCell;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.stereotype.Component;

/**
 * @author FangZenglin
 * @date 2023年10月13日16:38
 */
@Component
public class ExcelZhuanTuPian {

    public  void toImage(String dizhipath,String mubiaopath){

        test(dizhipath,mubiaopath);
    }

    public static void test(String path,String mubiaopath)   {
        int sheetNum = 0;
        int imageWidth = 0;
        int imageHeight = 0;
        InputStream inputStream;
        try {
            inputStream = new FileInputStream(path);
            Workbook workbook;
            Sheet sheet;
            List<List<String>> excelList;

            int bgColorFlag = 1;
            if (path.split("\\.")[1].equals("xlsx")) {

                workbook = new XSSFWorkbook(inputStream);

                excelList = readXlsx(path, sheetNum);
            } else {

                workbook = new HSSFWorkbook(inputStream);

                excelList = readXls(path, sheetNum);

                bgColorFlag = 0;
            }
            sheet = workbook.getSheetAt(sheetNum);
            List<CellRangeAddress> rangeAddress = sheet.getMergedRegions();

            int totalRow = excelList.size() + 1;
            int totalCol = excelList.get(0).size();
            UserCell[][] cells = new UserCell[totalRow + 1][totalCol + 1];
            int[] rowPixPos = new int[totalRow + 1];
            rowPixPos[0] = 0;
            int[] colPixPos = new int[totalCol + 1];
            colPixPos[0] = 0;

            for (int i = 0; i < totalRow - 1; i++) {
                for (int j = 0; j < totalCol; 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 = !(sheet.isColumnHidden(j) || sheet.getRow(i)
                            .getZeroHeight());
                    cells[i][j].setShow(ifShow);
                    float widthPix = !ifShow ? 0
                            : (sheet.getColumnWidthInPixels(j));
                    if (i == 0) {
                        imageWidth += widthPix;
                    }
                    colPixPos[j + 1] = (int) (widthPix * 1.15 + colPixPos[j]);
                }
                boolean ifShow = (i >= 0);
                ifShow = ifShow && !sheet.getRow(i).getZeroHeight();
                float heightPoint = !ifShow ? 0 : (sheet.getRow(i).getHeightInPoints());
                imageHeight += heightPoint;
                rowPixPos[i + 1] = (int) (heightPoint * 96 / 72) + rowPixPos[i];
            }
            imageHeight = imageHeight * 96 / 72;
            imageWidth = imageWidth * 115 / 100;
            List<Grid> grids = new ArrayList<Grid>();
            for (int i = 0; i < totalRow - 1; i++) {
                for (int j = 0; j < totalCol; j++) {
                    Grid grid = new Grid();
                    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());
                    int[] isInMergedStatus = isInMerged(grid.getRow(),
                            grid.getCol(), rangeAddress);
                    if (isInMergedStatus[0] == 0 && isInMergedStatus[1] == 0) {
                        continue;
                    } else if (isInMergedStatus[0] != -1
                            && isInMergedStatus[1] != -1) {
                        int lastRowPos = isInMergedStatus[0] > totalRow - 1 ? totalRow - 1 : isInMergedStatus[0];
                        int lastColPos = isInMergedStatus[1] > totalCol - 1 ? totalCol - 1 : isInMergedStatus[1];
                        grid.setWidth(colPixPos[lastColPos + 1] - colPixPos[j]);
                        grid.setHeight(rowPixPos[lastRowPos + 1] - rowPixPos[i]);
                    }
                    Cell cell = cells[i][j].getCell();
                    if (cell != null) {
                        CellStyle cs = cell.getCellStyle();
                        grid.setBgColor(cs.getFillForegroundColorColor());
                        org.apache.poi.ss.usermodel.Font font = workbook.getFontAt(cs.getFontIndex());
                        grid.setFont(font);
                        grid.setFtColor(cs.getFillBackgroundColorColor());
                        String strCell;
                        CellType cellType = cell.getCellTypeEnum();
                        switch (cellType) {
                            case STRING:
                                strCell = cell.getStringCellValue();
                                break;
                            case NUMERIC:
                                String str = String.valueOf(cell.getNumericCellValue());
                                if(str.contains("E")){
                                    String LeftEStr = str.toString().split("E")[0];
                                    strCell = LeftEStr.split("\\.")[0]+LeftEStr.split("\\.")[1];
                                }else{
                                    strCell = String.valueOf(cell.getNumericCellValue());
                                }
                                break;
                            case BLANK:
                                strCell = "";
                                break;
                            case FORMULA:
                                try {
                                    strCell = String.valueOf(cell.getNumericCellValue());
                                } catch (IllegalStateException e) {
                                    strCell = String.valueOf(cell.getRichStringCellValue());
                                }
                                break;
                            default:
                                strCell = "";
                                break;
                        }
                        if (cell.getCellStyle().getDataFormatString()
                                .contains("0.00%")) {
                            try {
                                double dbCell = Double.valueOf(strCell);
                                strCell = new DecimalFormat("0.00").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();

            g2d.setColor(Color.white);
            g2d.fillRect(0, 0, imageWidth, imageHeight);
            g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
            g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
            g2d.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL,RenderingHints.VALUE_STROKE_NORMALIZE);
            g2d.setRenderingHint(RenderingHints.KEY_TEXT_LCD_CONTRAST, 140);
            g2d.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS,RenderingHints.VALUE_FRACTIONALMETRICS_ON);
            g2d.setRenderingHint(RenderingHints.KEY_RENDERING,RenderingHints.VALUE_RENDER_QUALITY);
            for (Grid g : grids) {
                if (!g.isShow()) {
                    continue;
                }
                // 绘制背景色
                if (bgColorFlag == 1) {
                    // Excel2010以及更高-->使用原单元格背景色
                    g2d.setColor(g.getBgColor() == null ? Color.white : g.getBgColor());
                } else {
                    // Excel2007以及更低-->使用白色作为背景色
                    g2d.setColor(Color.white);
                }
                g2d.fillRect(g.getX(), g.getY(), g.getWidth(), g.getHeight());
                g2d.setColor(Color.black);
                g2d.setStroke(new BasicStroke(1));
                g2d.drawRect(g.getX(), g.getY(), g.getWidth(), g.getHeight());
                g2d.setColor(g.getFtColor());
                Font font = g.getFont();
                if (font == null) {
                    continue;
                }
                FontMetrics fm = g2d.getFontMetrics(font);
                int strWidth = fm.stringWidth(g.getText());
                g2d.setFont(font);
                g2d.drawString(
                        g.getText(),
                        g.getX() + (g.getWidth() - strWidth) / 2,
                        g.getY() + (g.getHeight() - font.getSize()) / 2+ font.getSize());
            }
            // 表格最后一行有可能不显示，手动画上一行
            g2d.drawLine(0, imageHeight - 1, imageWidth - 4, imageHeight - 1);

            g2d.drawLine(imageWidth-1 , 0, imageWidth-1 , imageHeight-1);
            g2d.dispose();
            ImageIO.write(image, "png", new File(mubiaopath));
            workbook.close();
        } catch (FileNotFoundException e1) {
            e1.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        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;
    }

    public static List<List<String>> readXlsx(String path, int pageNum)   {
        List<List<String>> resultList = new ArrayList<List<String>>();
        InputStream in;
        XSSFWorkbook xssfWorkbook;
        try {
            in = new FileInputStream(path);
            xssfWorkbook = new XSSFWorkbook(in);
            XSSFSheet xssfSheet = xssfWorkbook.getSheetAt(pageNum);
            if (xssfSheet != null) {
                for (int rowNum = 0; rowNum < xssfSheet.getLastRowNum() + 1; rowNum++) {
                    XSSFRow xssfRow = xssfSheet.getRow(rowNum);
                    int minColIX = xssfRow.getFirstCellNum();
                    int maxColIX = xssfRow.getLastCellNum();
                    List<String> rowList = new ArrayList<String>();
                    for (int colIX = minColIX; colIX < maxColIX; colIX++) {
                        XSSFCell cell = xssfRow.getCell(colIX);
                        if (cell != null) {
                            rowList.add(cell.toString());
                        }
                    }
                    resultList.add(rowList);
                }
            }
            xssfWorkbook.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return resultList;
    }

    // 读取xls文件内容
    public static List<List<String>> readXls(String path, int num)  {
        List<List<String>> resultList = new ArrayList<List<String>>();
        InputStream in;
        HSSFWorkbook hssfWorkbook;
        try {
            in = new FileInputStream(path);
            hssfWorkbook = new HSSFWorkbook(in);
            HSSFSheet hssfSheet = hssfWorkbook.getSheetAt(num);// 获取当前页
            if (hssfSheet != null) {
                for (int rowNum = 0; rowNum < hssfSheet.getLastRowNum() + 1; rowNum++) {
                    HSSFRow hssfRow = hssfSheet.getRow(rowNum);// 获取行数据
                    int minColIX = hssfRow.getFirstCellNum();// 第一行数据
                    int maxColIX = hssfRow.getLastCellNum();// 总行数
                    List<String> rowList = new ArrayList<String>();
                    // 遍历该行，处理该行数据
                    for (int colIX = minColIX; colIX < maxColIX; colIX++) {
                        HSSFCell cell = hssfRow.getCell(colIX);// 获取单元格
                        if (cell != null) {
                            rowList.add(cell.toString());
                        }
                    }
                    resultList.add(rowList);
                }
            }
            hssfWorkbook.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return resultList;
    }
}

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图片合并,模拟插入电子公章

package com.gxuwz.zjh.util;

import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;


/**
 * @author FangZenglin
 * @date 2023年10月13日15:30
 */
@Component
@Slf4j
public class ChaGongZhang {
    public static String s = "i61PdAClDxIs/8/6iSGOQQ==";
    public  void chagongzhang_suodui(String path_biao,String path_gongzhang,String path_mubiao) {
        try {

            BufferedImage image1 = ImageIO.read(new File(path_biao));

            BufferedImage image2 = ImageIO.read(new File(path_gongzhang));

            // 加载公章
        //    BufferedImage image3 = ImageIO.read(new File(path_gongzhang.replace("1","2")));

            int maxWidth = Math.max(image1.getWidth(), image2.getWidth());
            int maxHeight = Math.max(image1.getHeight(), image2.getHeight());
            BufferedImage combinedImage = new BufferedImage(maxWidth, maxHeight, BufferedImage.TYPE_INT_ARGB);

            Graphics2D g2d = combinedImage.createGraphics();

            g2d.drawImage(image1, 0, 0, null);

            // 计算第二张图片的位置
            int x = 150;
            int y = 365;//所队部门意见
            /**
             *int x = 480;
             *int y = 350;//人训部门意见
             */
            /**
             *int x = 780;
             *int y = 350;//单位主管领导
             */
            /**
             *int x = 1250;
             *int y = 350;//单位主要领导
             */
            g2d.drawImage(image2, x, y, null);
         //   g2d.drawImage(image3, x, y, null); 公章插入
            ImageIO.write(combinedImage, "png", new File(path_mubiao));
            g2d.dispose();
            log.info("图片合并成功！");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }



    public  void chagongzhang_renxun(String path_biao,String path_gongzhang,String path_mubiao) {
        try {
            // 加载第一张图片
            BufferedImage image1 = ImageIO.read(new File(path_biao));

            // 加载第二张图片
            BufferedImage image2 = ImageIO.read(new File(path_gongzhang));

            // 加载公章
           // BufferedImage image3 = ImageIO.read(new File(path_gongzhang.replace("1","2")));


            int maxWidth = Math.max(image1.getWidth(), image2.getWidth());
            int maxHeight = Math.max(image1.getHeight(), image2.getHeight());
            BufferedImage combinedImage = new BufferedImage(maxWidth, maxHeight, BufferedImage.TYPE_INT_ARGB);

            Graphics2D g2d = combinedImage.createGraphics();

            g2d.drawImage(image1, 0, 0, null);

             int x = 450;
             int y = 380;//人训部门意见

            /**
             *int x = 780;
             *int y = 350;//单位主管领导
             */
            /**
             *int x = 1250;
             *int y = 350;//单位主要领导
             */
            g2d.drawImage(image2, x, y, null);
            //   g2d.drawImage(image3, x, y, null); 公章插入
            ImageIO.write(combinedImage, "png", new File(path_mubiao));
            g2d.dispose();
            log.info("图片合并成功！");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public  void chagongzhang_zhuguanlingdao(String path_biao,String path_gongzhang,String path_mubiao) {
        try {
            // 加载第一张图片
            BufferedImage image1 = ImageIO.read(new File(path_biao));

            // 加载第二张图片
            BufferedImage image2 = ImageIO.read(new File(path_gongzhang));

            // 加载公章
         //   BufferedImage image3 = ImageIO.read(new File(path_gongzhang.replace("1","2")));


            int maxWidth = Math.max(image1.getWidth(), image2.getWidth());
            int maxHeight = Math.max(image1.getHeight(), image2.getHeight());
            BufferedImage combinedImage = new BufferedImage(maxWidth, maxHeight, BufferedImage.TYPE_INT_ARGB);

            Graphics2D g2d = combinedImage.createGraphics();

            g2d.drawImage(image1, 0, 0, null);

             int x = 745;
             int y = 350;//单位主管领导

            /**
             *int x = 1250;
             *int y = 350;//单位主要领导
             */
            g2d.drawImage(image2, x, y, null);
            //   g2d.drawImage(image3, x, y, null); 公章插入
            ImageIO.write(combinedImage, "png", new File(path_mubiao));
            g2d.dispose();
            log.info("图片合并成功！");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public  void chagongzhang_zhuyaolingdao(String path_biao,String path_gongzhang,String path_mubiao) {
        try {
            // 加载第一张图片
            BufferedImage image1 = ImageIO.read(new File(path_biao));

            // 加载第二张图片
            BufferedImage image2 = ImageIO.read(new File(path_gongzhang));

            // 加载公章
        //    BufferedImage image3 = ImageIO.read(new File(path_gongzhang.replace("1","2")));


            int maxWidth = Math.max(image1.getWidth(), image2.getWidth());
            int maxHeight = Math.max(image1.getHeight(), image2.getHeight());
            BufferedImage combinedImage = new BufferedImage(maxWidth, maxHeight, BufferedImage.TYPE_INT_ARGB);

            Graphics2D g2d = combinedImage.createGraphics();

            g2d.drawImage(image1, 0, 0, null);

             int x = 1215;
             int y = 350;//单位主要领导

            g2d.drawImage(image2, x, y, null);
            //   g2d.drawImage(image3, x, y, null); 公章插入
            ImageIO.write(combinedImage, "png", new File(path_mubiao));
            g2d.dispose();
            log.info("图片合并成功！");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    
}
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