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【V3.2.0】1、左侧菜单Logo和标题固定；2、Excel导出添加水印；3、长时间不在线自动返回登录页；4、移除sa-token的 token-prefix 配置；5、升级 ant deign vue到最新版4.2；6、登录页面引入登录类型图标方式；7、文件预览组件的文件下载方式为接口方式下载；
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zhuoda
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package net.lab1024.sa.base.common.util;
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import com.alibaba.excel.EasyExcel;
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import com.alibaba.excel.write.handler.SheetWriteHandler;
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import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
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import com.alibaba.excel.write.metadata.holder.WriteWorkbookHolder;
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import lombok.Data;
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import lombok.extern.slf4j.Slf4j;
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import org.apache.poi.openxml4j.opc.PackagePartName;
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import org.apache.poi.openxml4j.opc.PackageRelationship;
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import org.apache.poi.openxml4j.opc.TargetMode;
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import org.apache.poi.xssf.usermodel.XSSFPictureData;
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import org.apache.poi.xssf.usermodel.XSSFRelation;
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import org.apache.poi.xssf.usermodel.XSSFSheet;
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import org.apache.poi.xssf.usermodel.XSSFWorkbook;
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import javax.imageio.ImageIO;
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import javax.servlet.http.HttpServletResponse;
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import javax.swing.*;
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import java.awt.*;
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import java.awt.geom.AffineTransform;
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import java.awt.image.BufferedImage;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.util.Collection;
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/**
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*
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* excel 工具类
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*
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* @Author 1024创新实验室-主任:卓大
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* @Date 2024/4/22 22:49:07
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* @Wechat zhuoda1024
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* @Email lab1024@163.com
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* @Copyright 1024创新实验室 （ https://1024lab.net ），2012-2024
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*/
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public final class SmartExcelUtil {
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/**
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* 通用单sheet导出
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*/
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public static void exportExcel(HttpServletResponse response, String fileName, String sheetName, Class head,Collection<?> data) throws IOException {
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// 设置下载消息头
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SmartResponseUtil.setDownloadFileHeader(response, fileName, null);
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// 下载
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EasyExcel.write(response.getOutputStream(), head)
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.autoCloseStream(Boolean.FALSE)
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.sheet(sheetName)
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.doWrite(data);
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}
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/**
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* 通用单 sheet水印 导出
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*/
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public static void exportExcelWithWatermark(HttpServletResponse response, String fileName, String sheetName, Class head,Collection<?> data, String watermarkString) throws IOException {
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// 设置下载消息头
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SmartResponseUtil.setDownloadFileHeader(response, fileName, null);
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// 水印
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Watermark watermark = new Watermark(watermarkString);
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// 一定要inMemory
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EasyExcel.write(response.getOutputStream(), head)
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.inMemory(true)
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.sheet(sheetName)
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.registerWriteHandler(new CustomWaterMarkHandler(watermark))
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.doWrite(data);
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}
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@Slf4j
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private static class CustomWaterMarkHandler implements SheetWriteHandler {
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private final Watermark watermark;
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public CustomWaterMarkHandler(Watermark watermark) {
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this.watermark = watermark;
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}
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@Override
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public void afterSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {
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BufferedImage bufferedImage = createWatermarkImage();
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XSSFWorkbook workbook = (XSSFWorkbook) writeSheetHolder.getParentWriteWorkbookHolder().getWorkbook();
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try {
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// 添加水印的具体操作
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addWatermarkToSheet(workbook, bufferedImage);
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} catch (Exception e) {
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log.error("添加水印出错:", e);
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}
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}
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/**
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* 创建水印图片
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*
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* @return
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*/
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private BufferedImage createWatermarkImage() {
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// 获取水印相关参数
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Font font = watermark.getFont();
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int width = watermark.getWidth();
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int height = watermark.getHeight();
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Color color = watermark.getColor();
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String text = watermark.getContent();
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// 创建带有透明背景的 BufferedImage
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BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
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Graphics2D g = image.createGraphics();
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// 设置画笔字体、平滑、颜色
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g.setFont(font);
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g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
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g.setColor(color);
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// 计算水印位置和角度
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int y = watermark.getYAxis();
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int x = watermark.getXAxis();
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AffineTransform transform = AffineTransform.getRotateInstance(Math.toRadians(-watermark.getAngle()), 0, y);
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g.setTransform(transform);
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// 绘制水印文字
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g.drawString(text, x, y);
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// 释放资源
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g.dispose();
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return image;
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}
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private void addWatermarkToSheet(XSSFWorkbook workbook, BufferedImage watermarkImage) {
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try (ByteArrayOutputStream os = new ByteArrayOutputStream()) {
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ImageIO.write(watermarkImage, "png", os);
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int pictureIdx = workbook.addPicture(os.toByteArray(), XSSFWorkbook.PICTURE_TYPE_PNG);
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XSSFPictureData pictureData = workbook.getAllPictures().get(pictureIdx);
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for (int i = 0; i < workbook.getNumberOfSheets(); i++) {
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// 获取每个Sheet表
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XSSFSheet sheet = workbook.getSheetAt(i);
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PackagePartName ppn = pictureData.getPackagePart().getPartName();
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String relType = XSSFRelation.IMAGES.getRelation();
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PackageRelationship pr = sheet.getPackagePart().addRelationship(ppn, TargetMode.INTERNAL, relType, null);
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sheet.getCTWorksheet().addNewPicture().setId(pr.getId());
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}
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} catch (Exception e) {
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// 处理ImageIO.write可能抛出的异常
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log.error("添加水印图片时发生错误", e);
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}
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}
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}
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@Data
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private static class Watermark {
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public Watermark(String content) {
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this.content = content;
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init();
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}
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public Watermark(String content, Color color, Font font, double angle) {
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this.content = content;
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this.color = color;
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this.font = font;
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this.angle = angle;
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init();
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}
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/**
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* 根据水印内容长度自适应水印图片大小，简单的三角函数
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*/
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private void init() {
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FontMetrics fontMetrics = new JLabel().getFontMetrics(this.font);
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int stringWidth = fontMetrics.stringWidth(this.content);
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int charWidth = fontMetrics.charWidth('A');
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this.width = (int) Math.abs(stringWidth * Math.cos(Math.toRadians(this.angle))) + 5 * charWidth;
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this.height = (int) Math.abs(stringWidth * Math.sin(Math.toRadians(this.angle))) + 5 * charWidth;
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this.yAxis = this.height;
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this.xAxis = charWidth;
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}
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/**
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* 水印内容
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*/
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private String content;
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/**
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* 画笔颜色
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*/
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private Color color = new Color(239,239,239);
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/**
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* 字体样式
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*/
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private Font font = new Font("Microsoft YaHei", Font.BOLD, 26);
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/**
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* 水印宽度
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*/
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private int width;
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/**
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* 水印高度
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*/
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private int height;
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/**
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* 倾斜角度，非弧度制
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*/
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private double angle = 25;
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/**
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* 字体的y轴位置
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*/
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private int yAxis = 50;
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/**
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* 字体的X轴位置
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*/
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private int xAxis;
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/**
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* 水平倾斜度
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*/
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private double shearX = 0.1;
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/**
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* 垂直倾斜度
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*/
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private double shearY = -0.26;
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}
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}
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