fix：pdf导出优化

hxhq-modules/hxhq-system/src/main/java/com/hxhq/business/utils/PdfUtil.java

@@ -32,11 +32,11 @@ public class PdfUtil {
 
     /**
      * 导出form
-     * @param qm
+     * @param headerText
      * @param fileDir
      * @return
      */
-    public static String exportForm(String qm,String fileDir) {
+    public static String exportForm(String headerText,String fileDir) {
         Document document = null;
         FileOutputStream fos = null;
         String filePath = "";
@@ -52,13 +52,21 @@ public class PdfUtil {
             // 3. 完整文件路径
             filePath = Paths.get(fileDir, fileName).toString();
 
-            // 4. 创建PDF文档
-            document = new Document(PageSize.A4);
+            // 创建PDF文档 设置文档边距，避免内容遮挡页眉页脚
+            float topMargin = 70;    // 顶部边距（为页眉留出空间）
+            float bottomMargin = 60; // 底部边距（为页脚留出空间）
+            float leftMargin = 50;   // 左边距
+            float rightMargin = 50;  // 右边距
+
+             document = new Document(PageSize.A4,
+                    leftMargin, rightMargin, topMargin, bottomMargin);
+
+
             fos = new FileOutputStream(filePath);
             PdfWriter writer = PdfWriter.getInstance(document, fos);
 
-            // 使用完整的页脚处理器
-            writer.setPageEvent(new CompletePdfFooter());
+            // 设置页面事件，每页添加文字页眉
+            writer.setPageEvent(new TextHeaderEvent(headerText));
 
             // 5. 设置PDF属性
             document.addTitle("华西海圻");
@@ -67,28 +75,6 @@ public class PdfUtil {
             document.addCreationDate();
             document.open();
 
-            // 6. 设置中文字体
-            BaseFont bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
-            Font titleFont = new Font(bfChinese, 16, Font.BOLD);
-
-            // 7. 添加签名
-            Paragraph title = new Paragraph(qm, titleFont);
-            title.setAlignment(Element.ALIGN_CENTER);
-            title.setSpacingAfter(20);
-            document.add(title);
-
-            //横线
-            LineSeparator line = new LineSeparator();
-            line.setLineWidth(0.5f);
-            // 设置100%宽度
-            line.setPercentage(100f);  // 百分比宽度
-            // 设置对齐方式
-            line.setAlignment(Element.ALIGN_CENTER);  // Element.ALIGN_CENTER, Element.ALIGN_LEFT等
-            // 设置颜色
-            line.setLineColor(BaseColor.BLACK);
-            // 添加到文档
-            document.add(line);
-
             Map<String, String> formData = new LinkedHashMap<>();
             formData.put("姓名","张三");
             formData.put("性别", "男");
@@ -117,11 +103,11 @@ public class PdfUtil {
 
     /**
      * 导出table
-     * @param qm
+     * @param headerText
      * @param fileDir
      * @return
      */
-    public static String exportTable( String qm,String fileDir) {
+    public static String exportTable( String headerText,String fileDir) {
         Document document = null;
         FileOutputStream fos = null;
         String filePath = "";
@@ -138,13 +124,21 @@ public class PdfUtil {
             // 3. 完整文件路径
             filePath = Paths.get(fileDir, fileName).toString();
 
-            // 4. 创建PDF文档
-            document = new Document(PageSize.A4);
+            // 创建PDF文档 设置文档边距，避免内容遮挡页眉页脚
+            float topMargin = 70;    // 顶部边距（为页眉留出空间）
+            float bottomMargin = 60; // 底部边距（为页脚留出空间）
+            float leftMargin = 50;   // 左边距
+            float rightMargin = 50;  // 右边距
+
+            document = new Document(PageSize.A4,
+                    leftMargin, rightMargin, topMargin, bottomMargin);
+
             fos = new FileOutputStream(filePath);
             PdfWriter writer = PdfWriter.getInstance(document, fos);
 
-            // 使用完整的页脚处理器
-            writer.setPageEvent(new CompletePdfFooter());
+            // 设置页面事件，每页添加文字页眉
+            writer.setPageEvent(new TextHeaderEvent(headerText));
+
             // 5. 设置PDF属性
             document.addTitle("华西海圻");
             document.addAuthor("华西海圻");
@@ -155,28 +149,9 @@ public class PdfUtil {
 
             // 6. 设置中文字体
             BaseFont bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
-            Font titleFont = new Font(bfChinese, 18, Font.BOLD);
             Font headerFont = new Font(bfChinese, 12, Font.BOLD);
             Font contentFont = new Font(bfChinese, 10, Font.NORMAL);
 
-            // 7. 添加签名
-            Paragraph title = new Paragraph(qm, titleFont);
-            title.setAlignment(Element.ALIGN_CENTER);
-            title.setSpacingAfter(20);
-            document.add(title);
-
-            //横线
-            LineSeparator line = new LineSeparator();
-            line.setLineWidth(0.5f);
-            // 设置100%宽度
-            line.setPercentage(100f);  // 百分比宽度
-            // 设置对齐方式
-            line.setAlignment(Element.ALIGN_CENTER);  // Element.ALIGN_CENTER, Element.ALIGN_LEFT等
-            // 设置颜色
-            line.setLineColor(BaseColor.BLACK);
-            // 添加到文档
-            document.add(line);
-
             // 9. 创建表格
             PdfPTable table = new PdfPTable(3);
             table.setWidthPercentage(100);
@@ -311,78 +286,60 @@ public class PdfUtil {
 
 
     /**
-     * 页脚
+     * 页面事件处理类 - 每页添加文字页眉
      */
-    public static class CompletePdfFooter extends PdfPageEventHelper {
-
-        private Font footerFont;
-        private PdfTemplate total;
-        private int totalPages = 0;
-
-        public CompletePdfFooter() {
-            try {
-                BaseFont baseFont = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
-                footerFont = new Font(baseFont, 10, Font.NORMAL, BaseColor.GRAY);
-            } catch (Exception e) {
-                footerFont = new Font(Font.FontFamily.HELVETICA, 10, Font.NORMAL, BaseColor.GRAY);
-            }
-        }
-
-        @Override
-        public void onOpenDocument(PdfWriter writer, Document document) {
-            total = writer.getDirectContent().createTemplate(100, 16);
+    static class TextHeaderEvent extends PdfPageEventHelper {
+        private String headerText;
+        private BaseFont baseFont;
+
+        public TextHeaderEvent(String headerText) throws Exception {
+            this.headerText = headerText;
+            // 创建字体（支持中文）
+            this.baseFont = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
         }
 
-        @SneakyThrows
         @Override
         public void onEndPage(PdfWriter writer, Document document) {
-            PdfContentByte cb = writer.getDirectContent();
-
-            int currentPage = writer.getPageNumber();
-            float y = document.bottom() - 20;
-
-            // 在每一页都重新计算，确保位置准确
-            String pageText = "第 " + currentPage + " 页 / 共 ";
-            BaseFont baseFont = footerFont.getBaseFont();
+            try {
+                // 获取页面尺寸
+                Rectangle pageSize = document.getPageSize();
+                float pageWidth = pageSize.getWidth();
+                float pageHeight = pageSize.getHeight();
 
-            // 计算页面文本宽度
-            float pageTextWidth = baseFont.getWidthPoint(pageText, footerFont.getSize());
+                // 设置页眉参数
+                float topMargin = 30;     // 顶部边距
+                float fontSize = 12;      // 字体大小
 
-            // 临时用估计的总页数计算位置（等文档关闭后会被替换）
-            String tempTotal = String.valueOf(writer.getPageNumber() + 5); // 估计值
-            float totalWidth = baseFont.getWidthPoint(tempTotal, footerFont.getSize());
+                // 计算文字宽度（用于居中）
+                float textWidth = baseFont.getWidthPoint(headerText, fontSize);
 
-            // 计算起始位置
-            float totalTextWidth = pageTextWidth + totalWidth +
-                    baseFont.getWidthPoint(" 页", footerFont.getSize());
-            float startX = (document.getPageSize().getWidth() - totalTextWidth) / 2;
+                // 计算居中位置
+                float textX = (pageWidth - textWidth) / 2;
+                float textY = pageHeight - topMargin;
 
-            // 写入当前页信息
-            ColumnText.showTextAligned(cb, Element.ALIGN_LEFT,
-                    new Phrase(pageText, footerFont), startX, y, 0);
+                // 获取画布
+                PdfContentByte canvas = writer.getDirectContent();
 
-            // 添加总页数模板
-            cb.addTemplate(total, startX + pageTextWidth, y);
+                // 添加页眉文字
+                canvas.beginText();
+                canvas.setFontAndSize(baseFont, fontSize);
+                canvas.setTextMatrix(textX, textY);
+                canvas.showText(headerText);
+                canvas.endText();
 
-            // 写入"页"字
-            ColumnText.showTextAligned(cb, Element.ALIGN_LEFT,
-                    new Phrase(" 页", footerFont), startX + pageTextWidth + totalWidth, y, 0);
+                // 添加页眉分隔线（可选）
+                addHeaderLine(canvas, pageWidth, textY - 10);
 
+            } catch (Exception e) {
+                e.printStackTrace();
+            }
         }
 
-        @Override
-        public void onCloseDocument(PdfWriter writer, Document document) {
-            totalPages = writer.getPageNumber();
-            String totalPagesStr = String.valueOf(totalPages);
-
-            // 重新创建合适宽度的模板
-            BaseFont baseFont = footerFont.getBaseFont();
-            total.beginText();
-            total.setFontAndSize(baseFont, footerFont.getSize());
-            total.setTextMatrix(0, 0);
-            total.showText(totalPagesStr);
-            total.endText();
+        private void addHeaderLine(PdfContentByte canvas, float pageWidth, float yPos) {
+            canvas.setLineWidth(0.5f);
+            canvas.moveTo(50, yPos);
+            canvas.lineTo(pageWidth - 50, yPos);
+            canvas.stroke();
         }
     }
-
 }