【工具】Java Excel转图片

【工具】Java Excel转图片

package com.yj.luban.modules.office.excel;

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

import javax.imageio.ImageIO;
import java.awt.Color;
import java.awt.Font;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

public class ExcelToImg {
    public static void main(String[] args) throws IOException {
        // Excel 文件路径
        String excelFilePath = "D:\\WORK\\workspace_tools\\Office\\excelToImg\\工时.xlsx";
        FileInputStream excelFile = new FileInputStream(new File(excelFilePath));

        // 创建 Workbook 对象
        Workbook workbook = new XSSFWorkbook(excelFile);
        Sheet sheet = workbook.getSheetAt(0);  // 获取第一个工作表

        // 创建一个临时的 BufferedImage 用于测量文本宽度
        BufferedImage tempImage = new BufferedImage(1, 1, BufferedImage.TYPE_INT_RGB);
        Graphics2D tempGraphics = tempImage.createGraphics();
        Font font = new Font("Arial", Font.PLAIN, 12);
        tempGraphics.setFont(font);
        FontMetrics fontMetrics = tempGraphics.getFontMetrics();

        // 动态计算每列的宽度
        int totalColumns = getMaxColumns(sheet);
        int[] columnWidths = new int[totalColumns];
        int rowHeight = fontMetrics.getHeight() + 10;  // 行高根据字体高度动态调整

        // 遍历所有单元格内容，计算最大列宽
        for (int rowIndex = 0; rowIndex <= sheet.getLastRowNum(); rowIndex++) {
            Row row = sheet.getRow(rowIndex);
            if (row == null) continue;

            for (int colIndex = 0; colIndex < totalColumns; colIndex++) {
                Cell cell = row.getCell(colIndex);
                if (cell != null) {
                    String cellValue = cell.toString();
                    int textWidth = fontMetrics.stringWidth(cellValue) + 10;  // 加 10 像素边距
                    columnWidths[colIndex] = Math.max(columnWidths[colIndex], textWidth);
                } else {
                    columnWidths[colIndex] = Math.max(columnWidths[colIndex], 100);  // 设置默认最小宽度
                }
            }
        }

        // 计算图像总宽度和总高度
        int imageWidth = 50;  // 初始边距
        for (int colWidth : columnWidths) {
            imageWidth += colWidth;
        }
        int imageHeight = (sheet.getLastRowNum() + 1) * rowHeight + 100;  // 加上顶部和底部边距

        // 创建最终的 BufferedImage
        BufferedImage image = new BufferedImage(imageWidth, imageHeight, BufferedImage.TYPE_INT_RGB);
        Graphics2D graphics = image.createGraphics();

        // 设置白色背景
        graphics.setColor(Color.WHITE);
        graphics.fillRect(0, 0, imageWidth, imageHeight);

        // 设置字体
        graphics.setColor(Color.BLACK);
        graphics.setFont(font);

        // 起始坐标
        int startX = 50;
        int startY = 50;

        // 绘制每个单元格的内容和样式
        for (int rowIndex = 0; rowIndex <= sheet.getLastRowNum(); rowIndex++) {
            Row row = sheet.getRow(rowIndex);
            if (row == null) continue;

            int x = startX;
            for (int colIndex = 0; colIndex < totalColumns; colIndex++) {
                Cell cell = row.getCell(colIndex);
                String cellValue = (cell != null) ? cell.toString() : "";

                // 绘制单元格内容
                graphics.drawString(cellValue, x + 5, startY + rowIndex * rowHeight + rowHeight / 2);

                // 绘制单元格边框
                if (cell != null) {
                    CellStyle cellStyle = cell.getCellStyle();
                    drawCellBorders(graphics, x, startY + rowIndex * rowHeight, columnWidths[colIndex], rowHeight, cellStyle);
                }

                // 移动到下一个单元格的位置
                x += columnWidths[colIndex];
            }
        }

        // 释放资源
        graphics.dispose();
        workbook.close();
        tempGraphics.dispose();

        // 保存图片
        ImageIO.write(image, "png", new File("D:\\WORK\\workspace_tools\\Office\\excelToImg\\a.png"));

        System.out.println("Excel 样式和边框转换为图片成功！");
    }

    // 获取最大列数
    private static int getMaxColumns(Sheet sheet) {
        int maxColumns = 0;
        for (int rowIndex = 0; rowIndex <= sheet.getLastRowNum(); rowIndex++) {
            Row row = sheet.getRow(rowIndex);
            if (row != null && row.getLastCellNum() > maxColumns) {
                maxColumns = row.getLastCellNum();
            }
        }
        return maxColumns;
    }

    // 绘制单元格边框
    private static void drawCellBorders(Graphics2D graphics, int x, int y, int width, int height, CellStyle style) {
        // 设置边框颜色为黑色
        graphics.setColor(Color.BLACK);

        // 绘制顶部边框
        if (style.getBorderTop() != BorderStyle.NONE) {
            graphics.drawLine(x, y, x + width, y);
        }

        // 绘制底部边框
        if (style.getBorderBottom() != BorderStyle.NONE) {
            graphics.drawLine(x, y + height, x + width, y + height);
        }

        // 绘制左侧边框
        if (style.getBorderLeft() != BorderStyle.NONE) {
            graphics.drawLine(x, y, x, y + height);
        }

        // 绘制右侧边框
        if (style.getBorderRight() != BorderStyle.NONE) {
            graphics.drawLine(x + width, y, x + width, y + height);
        }
    }
}

设置指定字体

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

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

public class ExcelToStyledImageWithBorders {
    public static void main(String[] args) throws IOException {
        // Excel 文件路径
        String excelFilePath = "example.xlsx";
        FileInputStream excelFile = new FileInputStream(new File(excelFilePath));

        // 创建 Workbook 对象
        Workbook workbook = new XSSFWorkbook(excelFile);
        Sheet sheet = workbook.getSheetAt(0);  // 获取第一个工作表

        // 创建一个临时的 BufferedImage 用于测量文本宽度
        BufferedImage tempImage = new BufferedImage(1, 1, BufferedImage.TYPE_INT_RGB);
        Graphics2D tempGraphics = tempImage.createGraphics();

        // 使用 SimSun 字体，支持中文字符
        Font font = new Font("SimSun", Font.PLAIN, 12);
        tempGraphics.setFont(font);
        FontMetrics fontMetrics = tempGraphics.getFontMetrics();

        // 动态计算每列的宽度
        int totalColumns = getMaxColumns(sheet);
        int[] columnWidths = new int[totalColumns];
        int rowHeight = fontMetrics.getHeight() + 10;  // 行高根据字体高度动态调整

        // 遍历所有单元格内容，计算最大列宽
        for (int rowIndex = 0; rowIndex <= sheet.getLastRowNum(); rowIndex++) {
            Row row = sheet.getRow(rowIndex);
            if (row == null) continue;

            for (int colIndex = 0; colIndex < totalColumns; colIndex++) {
                Cell cell = row.getCell(colIndex);
                if (cell != null) {
                    String cellValue = cell.toString();
                    int textWidth = fontMetrics.stringWidth(cellValue) + 10;  // 加 10 像素边距
                    columnWidths[colIndex] = Math.max(columnWidths[colIndex], textWidth);
                } else {
                    columnWidths[colIndex] = Math.max(columnWidths[colIndex], 100);  // 设置默认最小宽度
                }
            }
        }

        // 计算图像总宽度和总高度
        int imageWidth = 50;  // 初始边距
        for (int colWidth : columnWidths) {
            imageWidth += colWidth;
        }
        int imageHeight = (sheet.getLastRowNum() + 1) * rowHeight + 100;  // 加上顶部和底部边距

        // 创建最终的 BufferedImage
        BufferedImage image = new BufferedImage(imageWidth, imageHeight, BufferedImage.TYPE_INT_RGB);
        Graphics2D graphics = image.createGraphics();

        // 设置白色背景
        graphics.setColor(Color.WHITE);
        graphics.fillRect(0, 0, imageWidth, imageHeight);

        // 设置字体，确保支持中文
        graphics.setFont(font);
        graphics.setColor(Color.BLACK);

        // 起始坐标
        int startX = 50;
        int startY = 50;

        // 绘制每个单元格的内容和样式
        for (int rowIndex = 0; rowIndex <= sheet.getLastRowNum(); rowIndex++) {
            Row row = sheet.getRow(rowIndex);
            if (row == null) continue;

            int x = startX;
            for (int colIndex = 0; colIndex < totalColumns; colIndex++) {
                Cell cell = row.getCell(colIndex);
                String cellValue = (cell != null) ? cell.toString() : "";

                // 绘制单元格内容
                graphics.drawString(cellValue, x + 5, startY + rowIndex * rowHeight + rowHeight / 2);

                // 绘制单元格边框
                if (cell != null) {
                    CellStyle cellStyle = cell.getCellStyle();
                    drawCellBorders(graphics, x, startY + rowIndex * rowHeight, columnWidths[colIndex], rowHeight, cellStyle);
                }

                // 移动到下一个单元格的位置
                x += columnWidths[colIndex];
            }
        }

        // 释放资源
        graphics.dispose();
        workbook.close();
        tempGraphics.dispose();

        // 保存图片
        ImageIO.write(image, "png", new File("excel_styled_with_borders_image.png"));

        System.out.println("Excel 样式和边框转换为图片成功！");
    }

    // 获取最大列数
    private static int getMaxColumns(Sheet sheet) {
        int maxColumns = 0;
        for (int rowIndex = 0; rowIndex <= sheet.getLastRowNum(); rowIndex++) {
            Row row = sheet.getRow(rowIndex);
            if (row != null && row.getLastCellNum() > maxColumns) {
                maxColumns = row.getLastCellNum();
            }
        }
        return maxColumns;
    }

    // 绘制单元格边框
    private static void drawCellBorders(Graphics2D graphics, int x, int y, int width, int height, CellStyle style) {
        // 设置边框颜色为黑色
        graphics.setColor(Color.BLACK);

        // 绘制顶部边框
        if (style.getBorderTop() != BorderStyle.NONE) {
            graphics.drawLine(x, y, x + width, y);
        }

        // 绘制底部边框
        if (style.getBorderBottom() != BorderStyle.NONE) {
            graphics.drawLine(x, y + height, x + width, y + height);
        }

        // 绘制左侧边框
        if (style.getBorderLeft() != BorderStyle.NONE) {
            graphics.drawLine(x, y, x, y + height);
        }

        // 绘制右侧边框
        if (style.getBorderRight() != BorderStyle.NONE) {
            graphics.drawLine(x + width, y, x + width, y + height);
        }
    }
}

支持公式 固定了一个字体

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

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

public class ExcelToStyledImageWithBordersAndFormula {
    public static void main(String[] args) throws IOException {
        // Excel 文件路径
        String excelFilePath = "example.xlsx";
        FileInputStream excelFile = new FileInputStream(new File(excelFilePath));

        // 创建 Workbook 对象
        Workbook workbook = new XSSFWorkbook(excelFile);
        Sheet sheet = workbook.getSheetAt(0);  // 获取第一个工作表

        // 创建 FormulaEvaluator 对象来解析公式
        FormulaEvaluator formulaEvaluator = workbook.getCreationHelper().createFormulaEvaluator();

        // 创建一个临时的 BufferedImage 用于测量文本宽度
        BufferedImage tempImage = new BufferedImage(1, 1, BufferedImage.TYPE_INT_RGB);
        Graphics2D tempGraphics = tempImage.createGraphics();

        // 使用 SimSun 字体，支持中文字符
        Font font = new Font("SimSun", Font.PLAIN, 12);
        tempGraphics.setFont(font);
        FontMetrics fontMetrics = tempGraphics.getFontMetrics();

        // 动态计算每列的宽度
        int totalColumns = getMaxColumns(sheet);
        int[] columnWidths = new int[totalColumns];
        int rowHeight = fontMetrics.getHeight() + 10;  // 行高根据字体高度动态调整

        // 遍历所有单元格内容，计算最大列宽
        for (int rowIndex = 0; rowIndex <= sheet.getLastRowNum(); rowIndex++) {
            Row row = sheet.getRow(rowIndex);
            if (row == null) continue;

            for (int colIndex = 0; colIndex < totalColumns; colIndex++) {
                Cell cell = row.getCell(colIndex);
                if (cell != null) {
                    String cellValue = getCellValue(cell, formulaEvaluator);  // 获取单元格值，包含公式解析
                    int textWidth = fontMetrics.stringWidth(cellValue) + 20;  // 加 20 像素边距
                    columnWidths[colIndex] = Math.max(columnWidths[colIndex], textWidth);
                } else {
                    columnWidths[colIndex] = Math.max(columnWidths[colIndex], 100);  // 设置默认最小宽度
                }
            }
        }

        // 计算图像总宽度和总高度
        int imageWidth = 100;  // 初始边距，增加更多的边距以防止截断
        for (int colWidth : columnWidths) {
            imageWidth += colWidth;
        }
        int imageHeight = (sheet.getLastRowNum() + 1) * rowHeight + 100;  // 加上顶部和底部边距

        // 创建最终的 BufferedImage
        BufferedImage image = new BufferedImage(imageWidth, imageHeight, BufferedImage.TYPE_INT_RGB);
        Graphics2D graphics = image.createGraphics();

        // 设置白色背景
        graphics.setColor(Color.WHITE);
        graphics.fillRect(0, 0, imageWidth, imageHeight);

        // 设置字体，确保支持中文
        graphics.setFont(font);
        graphics.setColor(Color.BLACK);

        // 起始坐标
        int startX = 50;
        int startY = 50;

        // 绘制每个单元格的内容和样式
        for (int rowIndex = 0; rowIndex <= sheet.getLastRowNum(); rowIndex++) {
            Row row = sheet.getRow(rowIndex);
            if (row == null) continue;

            int x = startX;
            for (int colIndex = 0; colIndex < totalColumns; colIndex++) {
                Cell cell = row.getCell(colIndex);
                String cellValue = (cell != null) ? getCellValue(cell, formulaEvaluator) : "";

                // 绘制单元格内容
                graphics.drawString(cellValue, x + 5, startY + rowIndex * rowHeight + rowHeight / 2);

                // 绘制单元格边框
                if (cell != null) {
                    CellStyle cellStyle = cell.getCellStyle();
                    drawCellBorders(graphics, x, startY + rowIndex * rowHeight, columnWidths[colIndex], rowHeight, cellStyle);
                }

                // 移动到下一个单元格的位置
                x += columnWidths[colIndex];
            }
        }

        // 释放资源
        graphics.dispose();
        workbook.close();
        tempGraphics.dispose();

        // 保存图片
        ImageIO.write(image, "png", new File("excel_styled_with_borders_and_formula_image.png"));

        System.out.println("Excel 样式和边框、公式转换为图片成功！");
    }

    // 获取单元格值，并解析公式
    private static String getCellValue(Cell cell, FormulaEvaluator formulaEvaluator) {
        switch (cell.getCellType()) {
            case STRING:
                return cell.getStringCellValue();
            case NUMERIC:
                return String.valueOf(cell.getNumericCellValue());
            case BOOLEAN:
                return String.valueOf(cell.getBooleanCellValue());
            case FORMULA:
                // 使用 FormulaEvaluator 解析公式
                CellValue evaluatedValue = formulaEvaluator.evaluate(cell);
                switch (evaluatedValue.getCellType()) {
                    case STRING:
                        return evaluatedValue.getStringValue();
                    case NUMERIC:
                        return String.valueOf(evaluatedValue.getNumberValue());
                    case BOOLEAN:
                        return String.valueOf(evaluatedValue.getBooleanValue());
                    default:
                        return " ";
                }
            default:
                return " ";
        }
    }

    // 获取最大列数
    private static int getMaxColumns(Sheet sheet) {
        int maxColumns = 0;
        for (int rowIndex = 0; rowIndex <= sheet.getLastRowNum(); rowIndex++) {
            Row row = sheet.getRow(rowIndex);
            if (row != null && row.getLastCellNum() > maxColumns) {
                maxColumns = row.getLastCellNum();
            }
        }
        return maxColumns;
    }

    // 绘制单元格边框
    private static void drawCellBorders(Graphics2D graphics, int x, int y, int width, int height, CellStyle style) {
        // 设置边框颜色为黑色
        graphics.setColor(Color.BLACK);

        // 绘制顶部边框
        if (style.getBorderTop() != BorderStyle.NONE) {
            graphics.drawLine(x, y, x + width, y);
        }

        // 绘制底部边框
        if (style.getBorderBottom() != BorderStyle.NONE) {
            graphics.drawLine(x, y + height, x + width, y + height);
        }

        // 绘制左侧边框
        if (style.getBorderLeft() != BorderStyle.NONE) {
            graphics.drawLine(x, y, x, y + height);
        }

        // 绘制右侧边框
        if (style.getBorderRight() != BorderStyle.NONE) {
            graphics.drawLine(x + width, y, x + width, y + height);
        }
    }
}

原文地址：https://blog.csdn.net/G971005287W/article/details/142329292

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