导出PDF

build.gradle

@@ -105,6 +105,10 @@ dependencies {
 	// easyexcel
 	implementation 'com.alibaba:easyexcel:3.1.2'
 
+	// PDF生成依赖
+	implementation 'com.itextpdf:itext7-core:7.2.5'
+	implementation 'com.itextpdf:html2pdf:4.0.5'
+
 }
 
 test {

src/main/java/com/gaotao/modules/base/controller/LabelSettingController.java

@@ -9,7 +9,9 @@ import com.gaotao.modules.base.service.ReportLabelListService;
 import com.gaotao.modules.base.service.ReportPaperListService;
 import com.gaotao.modules.base.dto.*;
 import com.gaotao.modules.base.vo.PaperUsageCheckResponse;
+import com.gaotao.modules.base.service.PdfExportService;
 import com.gaotao.modules.sys.controller.AbstractController;
+import jakarta.servlet.http.HttpServletResponse;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.web.bind.annotation.*;
@@ -28,6 +30,8 @@ public class LabelSettingController extends AbstractController {
     private ReportLabelListService reportLabelListService;
     @Autowired
     private ReportPaperListService reportPaperListService;
+    @Autowired
+    private PdfExportService pdfExportService;
 
     /**
     * @description: 查询打印标签的定义参数
@@ -860,4 +864,61 @@ public class LabelSettingController extends AbstractController {
         }
     }
 
+    /**
+     * @description: 导出预览图为PDF
+     * @author Kiro
+     * @date 2025/1/24
+     * @version 1.0
+     */
+    @PostMapping("exportPreviewToPdf")
+    public void exportPreviewToPdf(@RequestBody Map<String, Object> params,
+                                   HttpServletResponse response) {
+        try {
+            log.info("收到PDF导出请求: {}", params);
+
+            String reportId = (String) params.get("reportId");
+            String imageData = (String) params.get("imageData");
+
+            if (reportId == null || reportId.trim().isEmpty()) {
+                response.setStatus(400);
+                response.getWriter().write("标签ID不能为空");
+                return;
+            }
+
+            if (imageData == null || imageData.trim().isEmpty()) {
+                response.setStatus(400);
+                response.getWriter().write("预览图数据不能为空");
+                return;
+            }
+
+            log.info("开始生成PDF: reportId={}", reportId);
+
+            // 生成PDF
+            java.io.ByteArrayOutputStream pdfStream = pdfExportService.exportPreviewToPdf(imageData, reportId);
+
+            // 设置响应头
+            response.setContentType("application/pdf");
+            response.setHeader("Content-Disposition",
+                "attachment; filename=\"label_preview_" + reportId + "_" +
+                java.time.LocalDateTime.now().format(java.time.format.DateTimeFormatter.ofPattern("yyyyMMdd_HHmmss")) +
+                ".pdf\"");
+            response.setContentLength(pdfStream.size());
+
+            // 输出PDF
+            response.getOutputStream().write(pdfStream.toByteArray());
+            response.getOutputStream().flush();
+
+            log.info("PDF导出成功: reportId={}, size={}KB", reportId, pdfStream.size() / 1024);
+
+        } catch (Exception e) {
+            log.error("PDF导出失败: {}", e.getMessage(), e);
+            try {
+                response.setStatus(500);
+                response.getWriter().write("PDF导出失败: " + e.getMessage());
+            } catch (Exception ex) {
+                log.error("写入错误响应失败", ex);
+            }
+        }
+    }
+
 }

src/main/java/com/gaotao/modules/base/service/Impl/PdfExportServiceImpl.java

@@ -0,0 +1,117 @@
+package com.gaotao.modules.base.service.Impl;
+
+import com.gaotao.modules.base.service.PdfExportService;
+import com.itextpdf.io.image.ImageData;
+import com.itextpdf.io.image.ImageDataFactory;
+import com.itextpdf.kernel.colors.ColorConstants;
+import com.itextpdf.kernel.colors.DeviceRgb;
+import com.itextpdf.kernel.geom.PageSize;
+import com.itextpdf.kernel.pdf.PdfDocument;
+import com.itextpdf.kernel.pdf.PdfWriter;
+import com.itextpdf.layout.Document;
+import com.itextpdf.layout.borders.SolidBorder;
+import com.itextpdf.layout.element.Image;
+import com.itextpdf.layout.element.Paragraph;
+import com.itextpdf.layout.properties.HorizontalAlignment;
+import com.itextpdf.layout.properties.TextAlignment;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Service;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.net.URL;
+import java.util.Base64;
+
+/**
+ * PDF导出服务实现 - Java 21兼容版本
+ * @author Kiro
+ * @date 2025/1/24
+ */
+@Slf4j
+@Service
+public class PdfExportServiceImpl implements PdfExportService {
+
+    @Override
+    public ByteArrayOutputStream exportPreviewToPdf(String imageUrl, String reportId) throws Exception {
+        log.info("开始导出预览图为PDF: reportId={}", reportId);
+
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        PdfWriter writer = new PdfWriter(baos);
+        PdfDocument pdfDoc = new PdfDocument(writer);
+        Document document = new Document(pdfDoc, PageSize.A4);
+
+        try {
+            // 处理图片 - 直接添加预览图，不需要标题和时间戳
+            ImageData imageData = getImageData(imageUrl);
+            if (imageData != null) {
+                Image image = new Image(imageData);
+
+                // 调整图片大小以适应页面，留更多空间给图片
+                float pageWidth = PageSize.A4.getWidth() - 72;
+                float pageHeight = PageSize.A4.getHeight() - 72;
+
+                if (image.getImageWidth() > pageWidth || image.getImageHeight() > pageHeight) {
+                    image.scaleToFit(pageWidth, pageHeight);
+                }
+
+                // 直接添加带边框的图片，无需容器
+                image.setBorder(new SolidBorder(new DeviceRgb(221, 221, 221), 1));
+                image.setHorizontalAlignment(HorizontalAlignment.CENTER);
+                document.add(image);
+            } else {
+                // 如果无法加载图片，显示简单的错误信息
+                Paragraph errorParagraph = new Paragraph("无法加载预览图片");
+                errorParagraph.setTextAlignment(TextAlignment.CENTER);
+                errorParagraph.setFontSize(12);
+                document.add(errorParagraph);
+            }
+
+            log.info("PDF导出成功: reportId={}", reportId);
+
+        } finally {
+            document.close();
+        }
+
+        return baos;
+    }
+
+    /**
+     * 获取图片数据
+     */
+    private ImageData getImageData(String imageSource) {
+        try {
+            if (imageSource == null || imageSource.trim().isEmpty()) {
+                return null;
+            }
+
+            // 检查是否是Base64数据
+            if (imageSource.startsWith("data:image/")) {
+                String base64Data = imageSource.substring(imageSource.indexOf(",") + 1);
+                byte[] imageBytes = Base64.getDecoder().decode(base64Data);
+                return ImageDataFactory.create(imageBytes);
+            }
+
+            // 检查是否是网络URL
+            if (imageSource.startsWith("http://") || imageSource.startsWith("https://")) {
+                return ImageDataFactory.create(new URL(imageSource));
+            }
+
+            // 尝试作为本地文件路径处理
+            return ImageDataFactory.create(imageSource);
+
+        } catch (Exception e) {
+            log.error("获取图片数据失败: {}", e.getMessage());
+            return null;
+        }
+    }
+
+
+
+    /**
+     * 通过Labelary API生成预览图
+     */
+    private String generatePreviewImage(String zplCode, String paperSize, Integer dpi) throws IOException {
+        log.warn("ZPL预览图生成功能需要实现Labelary API调用");
+        return null;
+    }
+}

src/main/java/com/gaotao/modules/base/service/PdfExportService.java

@@ -0,0 +1,22 @@
+package com.gaotao.modules.base.service;
+
+import org.springframework.stereotype.Service;
+import java.io.ByteArrayOutputStream;
+
+/**
+ * PDF导出服务接口
+ * @author Kiro
+ * @date 2025/1/24
+ */
+@Service
+public interface PdfExportService {
+
+    /**
+     * 将预览图片导出为PDF
+     * @param imageUrl 预览图片URL或Base64数据
+     * @param reportId 标签ID
+     * @return PDF字节数组
+     */
+    ByteArrayOutputStream exportPreviewToPdf(String imageUrl, String reportId) throws Exception;
+
+}