Class PdfWatermark
java.lang.Object
cloud.opencode.base.pdf.content.PdfWatermark
PDF Watermark - Watermark element for PDF documents
PDF 水印 - PDF 文档的水印元素
Represents a text watermark that can be applied across all pages of a PDF document.
This is a document-level decoration, not a page content element (not a PdfElement).
表示可应用于 PDF 文档所有页面的文本水印。
这是文档级别的装饰,不是页面内容元素(不是 PdfElement)。
Features | 主要功能:
- Configurable text, rotation, opacity, color, font size - 可配置文本、旋转、透明度、颜色、字号
- Fluent builder API for chained configuration - 流畅的链式配置 API
- Default diagonal watermark appearance - 默认对角线水印外观
Usage Examples | 使用示例:
// Simple watermark
PdfWatermark watermark = PdfWatermark.text("CONFIDENTIAL");
// Customized watermark
PdfWatermark watermark = PdfWatermark.text("DRAFT")
.rotation(-30f)
.opacity(0.2f)
.color(PdfColor.RED)
.fontSize(80f);
Security | 安全性:
- Thread-safe: No — mutable builder pattern - 线程安全: 否 — 可变构建器模式
- Null-safe: text is required; color defaults to GRAY if null - 空值安全: text 必填;color 为 null 时默认为 GRAY
- Since:
- JDK 25, opencode-base-pdf V1.0.3
- Author:
- Leon Soo www.LeonSoo.com
- See Also:
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Method Summary
Modifier and TypeMethodDescriptionSets watermark color 设置水印颜色Sets font (null for default Helvetica) 设置字体(null 表示默认 Helvetica)fontSize(float size) Sets font size 设置字号getColor()Gets watermark color 获取水印颜色getFont()Gets font 获取字体floatGets font size 获取字号floatGets opacity 获取透明度floatGets rotation angle in degrees 获取旋转角度getText()Gets watermark text 获取水印文本opacity(float opacity) Sets opacity level 设置透明度rotation(float degrees) Sets rotation angle in degrees 设置旋转角度(度)static PdfWatermarkCreates a text watermark 创建文本水印toString()
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Method Details
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text
Creates a text watermark 创建文本水印- Parameters:
text- watermark text | 水印文本- Returns:
- PdfWatermark instance | PdfWatermark 实例
- Throws:
NullPointerException- if text is null | 当 text 为 null 时
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rotation
Sets rotation angle in degrees 设置旋转角度(度)- Parameters:
degrees- rotation angle | 旋转角度- Returns:
- this watermark | 当前水印
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opacity
Sets opacity level 设置透明度- Parameters:
opacity- opacity (0.0 transparent - 1.0 opaque) | 透明度(0.0 透明 - 1.0 不透明)- Returns:
- this watermark | 当前水印
- Throws:
IllegalArgumentException- if opacity is not in range [0.0, 1.0] | 当透明度不在 [0.0, 1.0] 范围时
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color
Sets watermark color 设置水印颜色- Parameters:
color- watermark color | 水印颜色- Returns:
- this watermark | 当前水印
- Throws:
NullPointerException- if color is null | 当 color 为 null 时
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fontSize
Sets font size 设置字号- Parameters:
size- font size in points | 字号(磅)- Returns:
- this watermark | 当前水印
- Throws:
IllegalArgumentException- if size is not positive | 当字号不为正数时
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font
Sets font (null for default Helvetica) 设置字体(null 表示默认 Helvetica)- Parameters:
font- font to use | 使用的字体- Returns:
- this watermark | 当前水印
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getText
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getRotation
public float getRotation()Gets rotation angle in degrees 获取旋转角度- Returns:
- rotation angle | 旋转角度
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getOpacity
public float getOpacity()Gets opacity 获取透明度- Returns:
- opacity (0.0-1.0) | 透明度
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getColor
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getFontSize
public float getFontSize()Gets font size 获取字号- Returns:
- font size in points | 字号
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getFont
Gets font 获取字体- Returns:
- font, or null for default Helvetica | 字体,null 表示默认 Helvetica
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toString
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