fix: paginate dropship pallet print details

firstleg/src/main/java/com/baiyue/firstleg/service/InboundCartonLabelPrintService.java

@@ -32,6 +32,8 @@ public class InboundCartonLabelPrintService {
     private static final BigDecimal PAGE_MM = new BigDecimal("100");
     private static final BigDecimal A4_WIDTH_MM = new BigDecimal("210");
     private static final BigDecimal A4_HEIGHT_MM = new BigDecimal("297");
+    private static final int DROPSHIP_INBOUND_ROWS_PER_PAGE = 10;
+    private static final int DROPSHIP_SKU_ROWS_PER_PAGE = 34;
     private static final List<String> SAFE_RESPONSE_HEADERS = List.of(
         HttpHeaders.CONTENT_DISPOSITION, HttpHeaders.CACHE_CONTROL, HttpHeaders.PRAGMA,
         "X-Print-Page-Count", "X-Request-Id", "X-Trace-Id");
@@ -134,7 +136,7 @@ public class InboundCartonLabelPrintService {
         }
         Map<Long, String> customerNicknameCache = new HashMap<>();
         List<PrintPdfClient.DropshipPalletDocument> documents = pallets.stream()
-            .map(pallet -> dropshipPalletDocument(pallet, customerNicknameCache)).toList();
+            .flatMap(pallet -> dropshipPalletDocuments(pallet, customerNicknameCache).stream()).toList();
         String fileName = pallets.size() == 1
             ? pallets.get(0).palletNo() + "-A4托盘信息单.pdf"
             : inboundCode + "-" + pallets.size() + "托-A4托盘信息单.pdf";
@@ -148,7 +150,7 @@ public class InboundCartonLabelPrintService {
         }
     }
 
-    private PrintPdfClient.DropshipPalletDocument dropshipPalletDocument(
+    private List<PrintPdfClient.DropshipPalletDocument> dropshipPalletDocuments(
         Pallet pallet, Map<Long, String> customerNicknameCache) {
         if (pallet == null || pallet.palletId() == null || !StringUtils.hasText(pallet.palletNo())) {
             throw new BizException(ResultCode.CONFLICT, "托盘码尚未生成，不能打印");
@@ -172,8 +174,31 @@ public class InboundCartonLabelPrintService {
             .stream().map(row -> new PrintPdfClient.DropshipPalletSkuRow(
                 row.getSkuCode(), number(row.getCartonCount()), number(row.getItemQuantity()),
                 unitsPerCarton(row))).toList();
-        return new PrintPdfClient.DropshipPalletDocument(
-            pallet.palletNo(), destinationWarehouse, pallet.palletNo(), inboundRows, skuRows);
+        int pageCount = Math.max(1, Math.max(pageCount(inboundRows.size(), DROPSHIP_INBOUND_ROWS_PER_PAGE),
+            pageCount(skuRows.size(), DROPSHIP_SKU_ROWS_PER_PAGE)));
+        List<PrintPdfClient.DropshipPalletDocument> documents = new ArrayList<>(pageCount);
+        for (int page = 0; page < pageCount; page++) {
+            documents.add(new PrintPdfClient.DropshipPalletDocument(
+                pallet.palletNo(), destinationWarehouse, pallet.palletNo(),
+                pageOrRepeat(inboundRows, page, DROPSHIP_INBOUND_ROWS_PER_PAGE),
+                page(skuRows, page, DROPSHIP_SKU_ROWS_PER_PAGE)));
+        }
+        return List.copyOf(documents);
+    }
+
+    private int pageCount(int size, int pageSize) {
+        return size == 0 ? 0 : (size + pageSize - 1) / pageSize;
+    }
+
+    private <T> List<T> page(List<T> rows, int page, int pageSize) {
+        int from = Math.min(rows.size(), page * pageSize);
+        int to = Math.min(rows.size(), from + pageSize);
+        return rows.subList(from, to);
+    }
+
+    private <T> List<T> pageOrRepeat(List<T> rows, int page, int pageSize) {
+        List<T> selected = page(rows, page, pageSize);
+        return selected.isEmpty() ? page(rows, 0, pageSize) : selected;
     }
 
     private String unitsPerCarton(DropshipPalletizationMapper.PrintSkuRow row) {

firstleg/src/test/java/com/baiyue/firstleg/service/InboundCartonLabelPrintServiceTest.java

@@ -18,6 +18,7 @@ import org.springframework.http.ResponseEntity;
 import org.springframework.test.util.ReflectionTestUtils;
 
 import java.math.BigDecimal;
+import java.util.ArrayList;
 import java.util.List;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -108,6 +109,43 @@ class InboundCartonLabelPrintServiceTest {
         assertThat(response.getBody()).containsExactly(4, 5, 6);
     }
 
+    @Test
+    void splitsLargeDropshipPalletDetailsAcrossPrintableA4Pages() {
+        Pallet pallet = dropshipPallet("OPEN");
+        stubPalletFacts(90001L);
+        List<DropshipPalletizationMapper.PrintSkuRow> skuRows = new ArrayList<>();
+        for (int index = 1; index <= 35; index++) {
+            DropshipPalletizationMapper.PrintSkuRow row = new DropshipPalletizationMapper.PrintSkuRow();
+            row.setSkuCode("SKU-" + index);
+            row.setCartonCount(1);
+            row.setItemQuantity(index);
+            row.setMinUnitsPerCarton(index);
+            row.setMaxUnitsPerCarton(index);
+            skuRows.add(row);
+        }
+        when(palletization.printSkuRows(90001L)).thenReturn(skuRows);
+        HttpHeaders headers = new HttpHeaders();
+        headers.setContentType(MediaType.APPLICATION_PDF);
+        when(print.generateDropshipPalletA4Documents(org.mockito.ArgumentMatchers.anyString(),
+            org.mockito.ArgumentMatchers.eq("request-large"), org.mockito.ArgumentMatchers.any()))
+            .thenReturn(new ResponseEntity<>(new byte[] {1}, headers,
+                org.springframework.http.HttpStatus.OK));
+
+        service.generateDropshipPallet(pallet, "PCHK2608040174", "request-large");
+
+        ArgumentCaptor<PrintPdfClient.DropshipPalletA4PdfRequest> request =
+            ArgumentCaptor.forClass(PrintPdfClient.DropshipPalletA4PdfRequest.class);
+        verify(print).generateDropshipPalletA4Documents(org.mockito.ArgumentMatchers.eq("internal-token"),
+            org.mockito.ArgumentMatchers.eq("request-large"), request.capture());
+        assertThat(request.getValue().documents()).hasSize(2).allSatisfy(document -> {
+            assertThat(document.palletNo()).isEqualTo("DP-260911-0001");
+            assertThat(document.inboundRows()).isNotEmpty().hasSizeLessThanOrEqualTo(10);
+            assertThat(document.skuRows()).hasSizeLessThanOrEqualTo(34);
+        });
+        assertThat(request.getValue().documents().get(0).skuRows()).hasSize(34);
+        assertThat(request.getValue().documents().get(1).skuRows()).hasSize(1);
+    }
+
     @Test
     void forwardsStableLabelsWithoutSkuAndOnlySafePdfHeaders() throws Exception {
         when(labels.list(10001L, 70001L, List.of(1))).thenReturn(batch());

print/src/main/java/com/baiyue/print/controller/PrintRequestSizeFilter.java

@@ -31,6 +31,7 @@ public class PrintRequestSizeFilter extends OncePerRequestFilter {
     private static final java.util.Set<String> PATHS = java.util.Set.of(
             "/internal/print/v1/pdfs/inbound-marks",
             "/internal/print/v1/pdfs/fba-pallet-labels",
+            "/internal/print/v1/pdfs/dropship-pallet-a4-documents",
             "/internal/print/v1/pdfs/freight-a4-documents");
 
     @Resource private PrintPdfProperties properties;

print/src/test/java/com/baiyue/print/controller/PrintRequestSizeFilterTest.java

@@ -62,6 +62,17 @@ class PrintRequestSizeFilterTest {
         assertTooLarge(response);
     }
 
+    @Test
+    void capsDropshipPalletRequestsBeforeDeserialization() throws Exception {
+        var response = new MockHttpServletResponse();
+        AtomicReference<Boolean> called = new AtomicReference<>(false);
+        filter.doFilter(request("12345678901", true,
+            "/internal/print/v1/pdfs/dropship-pallet-a4-documents"), response,
+            (ignoredRequest, ignoredResponse) -> called.set(true));
+        assertThat(called).hasValue(false);
+        assertTooLarge(response);
+    }
+
     @Test
     void rejectsOversizedDeclaredContentLengthWithoutCallingDownstream() throws Exception {
         MockHttpServletRequest request = new MockHttpServletRequest() {