前面我们介绍了如何使用Spire.Doc for Java 为Word文档添加文本水印和图片水印。当Word 文档中的某些部分，如段落，文本域Text Range, 表格，文本框和图形设置了背景色时，会出现水印被遮挡现象。该示例将详细介绍在Java应用程序中，给Word文档添加图片水印时移除段落，文本域，表格和文本框的背景色。

import com.spire.doc.*;
import com.spire.doc.documents.*;
import com.spire.doc.fields.*;

import java.awt.*;

public class WordWatermark {

    public static void main(String[] args) {
        //加载文档
        Document document = new Document("Sample.docx");
        //移除背景色
        SetNoFillForParagraphsAndTablesAndTextBoxes(document);
        //插入图片水印
        insertImageWatermark(document);
        //保存文档
        String output = "Result.docx";
        document.saveToFile(output, FileFormat.Docx);
    }
    public static void insertImageWatermark(Document document) {
        PictureWatermark picture = new PictureWatermark();
        picture.setPicture("logo.jpg");
        picture.setScaling(250);
        picture.isWashout(false);
        document.setWatermark(picture);
    }
    static void SetNoFillForParagraphsAndTablesAndTextBoxes(Document document) {
        Section section;
        Paragraph paragraph;
        TextRange textRange;
        for (int i = 0; i < document.getSections().getCount(); i++) {
            section = document.getSections().get(i);
            //移除段落中的背景色
            for (int j = 0; j < section.getBody().getParagraphs().getCount(); j++) {
                paragraph = section.getBody().getParagraphs().get(j);
                RemoveBackgroudColorOfParagraph(paragraph);
            }
            Table table;
            //移除表格中的背景色
            for (int t = 0; t < section.getBody().getTables().getCount(); t++) {
                table = section.getBody().getTables().get(t);
                table.getTableFormat().clearBackground();
                for(int r=0;r<table.getRows().getCount();r++){
                    TableRow row =table.getRows().get(r);
                    row.getRowFormat().clearBackground();
                    for(int c=0;c<row.getCells().getCount();c++){
                        TableCell cell = row.getCells().get(c);
                        cell.getCellFormat().clearBackground();
                        for(int p=0;p<cell.getParagraphs().getCount();p++) {
                            paragraph = (Paragraph) cell.getParagraphs().get(p);
                            //移除段落中的背景色
                            RemoveBackgroudColorOfParagraph(paragraph);
                        }
                    }
                }
            }
            //移除文本框中的背景色
            TextBox textBox;
            for (int n = 0; n < document.getTextBoxes().getCount(); n++) {
                document.getTextBoxes().get(n).getFormat().setFillColor(null);
                for(int t=0;t<document.getTextBoxes().getCount();t++) {
                    textBox = document.getTextBoxes().get(t);
                    for(int p=0;p<textBox.getChildObjects().getCount();p++)
                        if(textBox.getChildObjects().get(p) instanceof Paragraph) {
                            paragraph = (Paragraph) textBox.getChildObjects().get(p);
                            //移除段落中的背景色
                            RemoveBackgroudColorOfParagraph(paragraph);
                        }
                }
            }

        }
    }
    static void RemoveBackgroudColorOfParagraph(Paragraph paragraph)
    {
        TextRange textRange;
        paragraph.getFormat().setBackColor(new Color(0, 0, 0, 0));
        for (int k = 0; k < paragraph.getChildObjects().getCount(); k++) {
            if (paragraph.getChildObjects().get(k) instanceof TextRange) {
                textRange = (TextRange) paragraph.getChildObjects().get(k);
                //移除文本域中的背景色
                textRange.getCharacterFormat().setTextBackgroundColor(new Color(0, 0, 0, 0));
            }
        }
    }
}

效果图：