C#向pdf文件添加水印

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2021年1月29日 10:2 本文热度 3029

1 调用直接这样用：
2 //PDFHelper.AddImageWatermarkPDF(path, "D://my.pdf", Server.MapPath("/HtmlToPdf/Tools/sy.bmp"), 0, 0);
3 string temp = DateTime.Now.ToLongDateString() + " " + DateTime.Now.ToLongTimeString();
4 Guid guid = new Guid();
5 guid = Guid.NewGuid();
6
7 string tempGUID = guid.ToString();
8 File.Copy("E:\\1.pdf", "E:\\11.pdf", true);
9 PDFHelper.AddWordWatermark2PDF("E:\\11.pdf", "E:\\1.pdf", "西安咸阳国际机场南三指廊航站楼工程施工及施工管理总承包" + "_" + temp + "_" + tempGUID + "_7.1");
10 //PDFSetWaterMark.setWatermark("D://my.pdf", "D://my2.pdf", "TEST", "", "", 1);
11
12
13 using iTextSharp.text;
14 using iTextSharp.text.pdf;
15 using System;
16 using System.Collections.Generic;
17 using System.IO;
18 using System.Linq;
19 using System.Text;
20 using System.Threading.Tasks;
21
22 namespace Test测试
23 {
24 public static class PDFHelper
25 {
26
27
28 /// <summary>
29 /// 加图片水印
30 /// </summary>
31 /// <param name="inputfilepath"></param>
32 /// <param name="outputfilepath"></param>
33 /// <param name="ModelPicName"></param>
34 /// <param name="top"></param>
35 /// <param name="left"></param>
36 /// <returns></returns>
37 public static bool AddImageWatermarkPDF(string inputfilepath, string outputfilepath, string ModelPicName, float top, float left)
38 {
39 //throw new NotImplementedException();
40 PdfReader pdfReader = null;
41 PdfStamper pdfStamper = null;
42 try
43 {
44 pdfReader = new PdfReader(inputfilepath);
45
46 int numberOfPages = pdfReader.NumberOfPages;
47
48 iTextSharp.text.Rectangle psize = pdfReader.GetPageSize(1);
49
50 float width = psize.Width;
51
52 float height = psize.Height;
53
54 pdfStamper = new PdfStamper(pdfReader, new FileStream(outputfilepath, FileMode.Create));
55
56 PdfContentByte waterMarkContent;
57
58 iTextSharp.text.Image image = iTextSharp.text.Image.GetInstance(ModelPicName);
59
60 image.GrayFill = 20;//透明度，灰色填充
61 //image.Rotation//旋转
62 //image.RotationDegrees//旋转角度
63 //水印的位置
64 if (left < 0)
65 {
66 left = width / 2 - image.Width + left;
67 }
68
69 //image.SetAbsolutePosition(left, (height - image.Height) - top);
70 image.SetAbsolutePosition(left, (height / 2 - image.Height) - top);
71
72
73 //每一页加水印,也可以设置某一页加水印
74 for (int i = 1; i <= numberOfPages; i++)
75 {
76 //waterMarkContent = pdfStamper.GetUnderContent(i);//内容下层加水印
77 waterMarkContent = pdfStamper.GetOverContent(i);//内容上层加水印
78
79 waterMarkContent.AddImage(image);
80 }
81 //strMsg = "success";
82 return true;
83 }
84 catch (Exception ex)
85 {
86 throw ex;
87
88 }
89 finally
90 {
91
92 if (pdfStamper != null)
93 pdfStamper.Close();
94
95 if (pdfReader != null)
96 pdfReader.Close();
97 }
98 }
99 /// <summary>
100 /// 添加普通偏转角度文字水印
101 /// </summary>
102 /// <param name="inputfilepath"></param>
103 /// <param name="outputfilepath"></param>
104 /// <param name="waterMarkName"></param>
105 /// <param name="permission"></param>
106 public static void AddWordWatermark2PDF(string inputfilepath, string outputfilepath, string waterMarkName)
107 {
108 PdfReader pdfReader = null;
109 PdfStamper pdfStamper = null;
110 try
111 {
112 pdfReader = new PdfReader(inputfilepath);
113 pdfStamper = new PdfStamper(pdfReader, new FileStream(outputfilepath, FileMode.Create));
114 int total = pdfReader.NumberOfPages + 1;
115 iTextSharp.text.Rectangle psize = pdfReader.GetPageSize(1);
116 float width = psize.Width;
117 float height = psize.Height;
118 PdfContentByte content;
119 BaseFont font = BaseFont.CreateFont(@"C:\WINDOWS\Fonts\SIMFANG.TTF", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
120 PdfGState gs = new PdfGState();
121 for (int i = 1; i < total; i++)
122 {
123 content = pdfStamper.GetOverContent(i);//在内容上方加水印
124 //content = pdfStamper.GetUnderContent(i);//在内容下方加水印
125 //透明度
126 gs.FillOpacity = 0.5f;
127 content.SetGState(gs);
128 content.SetGrayFill(0.5f);
129 //开始写入文本
130 content.BeginText();
131 //content.SetColorFill(BaseColor.LIGHT_GRAY);
132 //content.SetFontAndSize(font, 100);
133 //content.SetTextMatrix(0, 0);
134 //content.ShowTextAligned(Element.ALIGN_CENTER, waterMarkName, width / 2 - 50, height / 2 - 50, 55);
135 content.SetColorFill(BaseColor.GRAY);
136 content.SetFontAndSize(font, 16);
137 content.ShowTextAligned(Element.ALIGN_CENTER, waterMarkName, width / 2 - 50, height / 2 - 50, 55);
138 content.EndText();
139 }
140 }
141 catch (Exception ex)
142 {
143 throw ex;
144 }
145 finally
146 {
147
148 if (pdfStamper != null)
149 pdfStamper.Close();
150
151 if (pdfReader != null)
152 pdfReader.Close();
153 }
154 }
155
156
157
158 /// <summary>
159 /// 添加倾斜水印
160 /// </summary>
161 /// <param name="inputfilepath"></param>
162 /// <param name="outputfilepath"></param>
163 /// <param name="waterMarkName"></param>
164 /// <param name="userPassWord"></param>
165 /// <param name="ownerPassWord"></param>
166 /// <param name="permission"></param>
167 public static void setWatermark(string inputfilepath, string outputfilepath, string waterMarkName, string userPassWord, string ownerPassWord, int permission)
168 {
169 PdfReader pdfReader = null;
170 PdfStamper pdfStamper = null;
171 try
172 {
173 pdfReader = new PdfReader(inputfilepath);
174 pdfStamper = new PdfStamper(pdfReader, new FileStream(outputfilepath, FileMode.Create));
175 // 设置密码
176 //pdfStamper.SetEncryption(false,userPassWord, ownerPassWord, permission);
177
178 int total = pdfReader.NumberOfPages + 1;
179 PdfContentByte content;
180 BaseFont font = BaseFont.CreateFont(@"C:\WINDOWS\Fonts\SIMFANG.TTF", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
181 PdfGState gs = new PdfGState();
182 gs.FillOpacity = 0.2f;//透明度
183
184 int j = waterMarkName.Length;
185 char c;
186 int rise = 0;
187 for (int i = 1; i < total; i++)
188 {
189 rise = 500;
190 content = pdfStamper.GetOverContent(i);//在内容上方加水印
191 //content = pdfStamper.GetUnderContent(i);//在内容下方加水印
192
193 content.BeginText();
194 content.SetColorFill(BaseColor.DARK_GRAY);
195 content.SetFontAndSize(font, 50);
196 // 设置水印文字字体倾斜开始
197 if (j >= 15)
198 {
199 content.SetTextMatrix(200, 120);
200 for (int k = 0; k < j; k++)
201 {
202 content.SetTextRise(rise);
203 c = waterMarkName[k];
204 content.ShowText(c + "");
205 rise -= 20;
206 }
207 }
208 else
209 {
210 content.SetTextMatrix(180, 100);
211 for (int k = 0; k < j; k++)
212 {
213 content.SetTextRise(rise);
214 c = waterMarkName[k];
215 content.ShowText(c + "");
216 rise -= 18;
217 }
218 }
219 // 字体设置结束
220 content.EndText();
221 // 画一个圆
222 //content.Ellipse(250, 450, 350, 550);
223 //content.SetLineWidth(1f);
224 //content.Stroke();
225 }
226
227 }
228 catch (Exception ex)
229 {
230 throw ex;
231 }
232 finally
233 {
234
235 if (pdfStamper != null)
236 pdfStamper.Close();
237
238 if (pdfReader != null)
239 pdfReader.Close();
240 }
241 }
242
243
244
245
246 }
247
248
249
250 }

该文章在 2021/1/29 10:02:04 编辑过

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