fix: 更新带水印下载代码逻辑

adc-da-base/src/main/java/com/adc/da/util/WaterMarkUtil.java

@@ -4,7 +4,12 @@ import com.itextpdf.text.BaseColor;
 import com.itextpdf.text.Element;
 import com.itextpdf.text.Rectangle;
 import com.itextpdf.text.pdf.*;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
+import javax.swing.*;
+import java.awt.*;
+import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.lang.reflect.Field;
 
@@ -15,6 +20,8 @@ import java.lang.reflect.Field;
  */
 public class WaterMarkUtil {
 
+    private static final Logger logger = LoggerFactory.getLogger(WaterMarkUtil.class);
+
     /**
      * @param inputFile 你的PDF文件地址
      * @param outputFile 添加水印后生成PDF存放的地址
@@ -78,4 +85,83 @@ public class WaterMarkUtil {
         }
     }
 
+
+
+    public static boolean waterMarkNew(String inputFile, String outputFile, String waterMarkName) {
+        try {
+            logger.debug("水印追加文件："+inputFile+"    "+outputFile);
+            FileInputStream is = new FileInputStream(inputFile);
+            PdfReader reader = new PdfReader(is);
+            Field f = PdfReader.class.getDeclaredField("encrypted");
+            f.setAccessible(true);
+            f.set(reader, Boolean.FALSE);
+            PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(outputFile));
+
+            // 获取总页数 +1, 下面从1开始遍历
+            int total = reader.getNumberOfPages() + 1;
+            //这里的字体设置比较关键，这个设置是支持中文的写法
+            BaseFont base = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);// 使用系统字体
+
+            // 间隔
+            int interval = 5;
+            // 获取水印文字的高度和宽度
+            int textH = 0, textW = 0;
+            JLabel label = new JLabel();
+            label.setText(waterMarkName);
+            FontMetrics metrics = label.getFontMetrics(label.getFont());
+            textH = metrics.getHeight();
+            textW = metrics.stringWidth(label.getText());
+
+            // 设置水印透明度
+            PdfGState gs = new PdfGState();
+            gs.setFillOpacity(0.2f);
+            gs.setStrokeOpacity(0.2f);
+
+            Rectangle pageSizeWithRotation = null;
+            PdfContentByte content = null;
+            for (int i = 1; i < total; i++) {
+                // 在内容上方加水印
+                content = stamper.getOverContent(i);
+                // 在内容下方加水印
+                // content = stamper.getUnderContent(i);
+                content.saveState();
+                content.setGState(gs);
+
+                // 设置字体和字体大小
+                content.beginText();
+                content.setFontAndSize(base, 19);
+
+                // 获取每一页的高度、宽度
+                pageSizeWithRotation = reader.getPageSizeWithRotation(i);
+                float pageHeight = pageSizeWithRotation.getHeight();
+                float pageWidth = pageSizeWithRotation.getWidth();
+                int parityNum = 0;
+                // 根据纸张大小多次添加， 水印文字成30度角倾斜
+                for (int height = interval + textH; height < pageHeight; height = height + textH * 6) {
+                    parityNum ++;
+                    for (int width = interval + textW; width < pageWidth + textW; width = width + textW * 2) {
+                        if(parityNum%2==0){
+                            width= width + 50;
+                            height = height +50;
+                            content.showTextAligned(Element.ALIGN_LEFT, waterMarkName, width - textW, height - textH, 30);
+                        }else{
+                            content.showTextAligned(Element.ALIGN_LEFT, waterMarkName, width - textW, height - textH, 30);
+                        }
+
+                    }
+                }
+
+                content.endText();
+            }
+
+            // 关流
+            stamper.close();
+            reader.close();
+            return true;
+        } catch (Exception e) {
+            logger.error(e.getMessage(),e);
+            return false;
+        }
+    }
+
 }

adc-da-sys/src/main/java/com/adc/da/att/controller/AttFileEOController.java

@@ -441,7 +441,7 @@ public class AttFileEOController {
             String waterContent = userMsg;
             //2020年9月5日  去掉水印处理
             //2021年7月25日要求下载生成水印
-            WaterMarkUtil.waterMark(oldFilePath,waterFilePath,waterContent);
+            WaterMarkUtil.waterMarkNew(oldFilePath,waterFilePath,waterContent);
             response.setHeader("Content-Disposition", "attachment;filename=\""+fileOldName+"\"");
             response.setContentType("application/octet-stream");