订货单：改成导出pdf

@@ -49,15 +49,15 @@ import javax.annotation.Resource;
 import javax.servlet.http.HttpServletResponse;
 import javax.validation.Valid;
 import javax.validation.constraints.NotBlank;
-import java.io.FileNotFoundException;
-import java.io.IOException;
-import java.io.InputStream;
+import java.io.*;
 import java.math.BigDecimal;
 import java.math.RoundingMode;
 import java.net.URLEncoder;
+import java.nio.file.Files;
 import java.time.LocalDate;
 import java.time.format.DateTimeFormatter;
 import java.util.*;
+import java.util.concurrent.TimeUnit;
 import java.util.stream.Collectors;
 
 /**
@@ -358,13 +358,12 @@ public class PurchaseOrderInfoController extends DefaultBaseController {
     public void printPurchaseOrder(@NotBlank(message = "id不能为空") String id, HttpServletResponse response) throws IOException {
         PurchaseOrderInfo data = purchaseOrderInfoService.findById(id);
 
-        // 设置响应头
-        setupResponse(response, data.getOrderNo() + "-订货单打印.xlsx");
-
         Wrapper<PurchaseOrderLine> purchaseOrderLineWrapper = Wrappers.lambdaQuery(PurchaseOrderLine.class)
                 .eq(PurchaseOrderLine::getPurchaseOrderId, id);
         List<PurchaseOrderLine> purchaseOrderLineList = purchaseOrderLineService.list(purchaseOrderLineWrapper);
 
+        File tempExcel = null;
+        File pdfFile = null;
 
         try {
             // 加载模板文件
@@ -467,21 +466,96 @@ public class PurchaseOrderInfoController extends DefaultBaseController {
 
                     processTemplate(workbook, dataMap);
 
-                    // 写入响应流
-                    workbook.write(response.getOutputStream());
-                    response.getOutputStream().flush();
+                    // === 4. 写入临时 .xlsx 文件 ===
+                    tempExcel = File.createTempFile("purchase_order_" + data.getOrderNo(), ".xlsx");
+                    try (FileOutputStream fos = new FileOutputStream(tempExcel)) {
+                        workbook.write(fos);
+                    }
+
                 } finally {
                     IOUtils.closeQuietly(workbook);
                 }
+            }
 
-            } catch (FileNotFoundException e) {
-                throw new RuntimeException("模板文件不存在: templates/purchaseOrderTemplate.xlsx", e);
-            } catch (IOException e) {
-                throw new RuntimeException("无法读取模板文件: templates/purchaseOrderTemplate.xlsx", e);
+            // === 5. 调用 LibreOffice 转 PDF ===
+            pdfFile = convertExcelToPdf(tempExcel);
+
+            // === 6. 设置 PDF 响应头 ===
+            String fileName = data.getOrderNo() + "-订货单打印.pdf";
+            String encodedFileName;
+            try {
+                encodedFileName = URLEncoder.encode(fileName, "UTF-8").replaceAll("\\+", "%20");
+            } catch (UnsupportedEncodingException e) {
+                // UTF-8 是标准编码，理论上不会抛出，但 Java 8 要求处理
+                throw new RuntimeException("UTF-8 encoding not supported", e);
+            }
+            response.setContentType("application/pdf");
+            response.setCharacterEncoding("UTF-8");
+            response.setHeader("Content-Disposition", "attachment;filename=" + encodedFileName);
+            response.setHeader("Access-Control-Expose-Headers", "Content-Disposition");
+
+            // === 7. 输出 PDF 到浏览器 ===
+            try (InputStream pdfIn = new FileInputStream(pdfFile)) {
+                byte[] buffer = new byte[8192];
+                int len;
+                while ((len = pdfIn.read(buffer)) != -1) {
+                    response.getOutputStream().write(buffer, 0, len);
+                }
+                response.getOutputStream().flush();
             }
+
         } catch (Exception e) {
-            log.error("标准合同模版打印: {}", e.getMessage(), e);
-            throw e;
+            log.error("订货单导出 PDF 失败: {}", e.getMessage(), e);
+            throw new RuntimeException("订货单导出失败，请联系管理员", e);
+        } finally {
+            // === 8. 清理临时文件 ===
+            deleteQuietly(tempExcel);
+            deleteQuietly(pdfFile);
+        }
+    }
+
+    private File convertExcelToPdf(File excelFile) throws IOException, InterruptedException {
+        if (!excelFile.exists()) {
+            throw new IllegalArgumentException("Excel 文件不存在: " + excelFile.getAbsolutePath());
+        }
+
+        String pdfPath = excelFile.getAbsolutePath().replaceAll("\\.xlsx$", ".pdf");
+        File pdfFile = new File(pdfPath);
+
+        // 使用绝对路径 /usr/bin/libreoffice（CentOS 7 默认位置）
+        String command = String.format(
+                "/usr/bin/libreoffice --headless --convert-to pdf --outdir %s %s",
+                excelFile.getParent(),
+                excelFile.getAbsolutePath()
+        );
+
+        Process process = Runtime.getRuntime().exec(command);
+        boolean finished = process.waitFor(30, TimeUnit.SECONDS); // 超时 30 秒
+
+        if (!finished) {
+            process.destroyForcibly();
+            throw new RuntimeException("LibreOffice 转换超时（>30秒）");
+        }
+
+        int exitCode = process.exitValue();
+        if (exitCode != 0) {
+            throw new RuntimeException("LibreOffice 转换失败，退出码: " + exitCode);
+        }
+
+        if (!pdfFile.exists()) {
+            throw new RuntimeException("PDF 未生成: " + pdfPath);
+        }
+
+        return pdfFile;
+    }
+
+    private void deleteQuietly(File file) {
+        if (file != null && file.exists()) {
+            try {
+                Files.delete(file.toPath());
+            } catch (IOException e) {
+                log.warn("无法删除临时文件: {}", file.getAbsolutePath(), e);
+            }
         }
     }