前段時間公司的產品,要做一個新功能,簽章(就是把需要的數據整理成PDF很標準的文件,然後在蓋上我們在服務器上面的章)
然後我就在百度上找了找,發現搞PDF的類庫很少,要麼就要錢,要麼就有水印,破解版的沒找到。
先講一講我是怎麼生成PDF的
1、生成PDF
這裏用到了 Spire.Pdf 這個類庫可以在NuGet裏面搜索到,上面帶個小紅標的就是免費版本。
當然也可以去他們的官網,上面還有文檔(https://www.e-iceblue.cn/Introduce/Spire-PDF-NET.html)。
代碼(這是我自己寫的一個測試的表格)
public static void abc()
{
//創建PDF文檔
Spire.Pdf.PdfDocument doc = new Spire.Pdf.PdfDocument();
//添加一頁
PdfPageBase page = doc.Pages.Add();
//設置字體
PdfTrueTypeFont font = new PdfTrueTypeFont(new System.Drawing.Font("Microsoft Yahei", 20f), true);
PdfTrueTypeFont font1 = new PdfTrueTypeFont(new System.Drawing.Font("Microsoft Yahei", 11f), true);
//創建一個PdfGrid對象
PdfGrid grid = new PdfGrid();
//這一段的內容是在表格只玩显示一些數據 根據坐標定位 第一個是內容,第二個是字體,第三個是顏色,第四第五是坐標
page.Canvas.DrawString("XXXXXXXX管理中心回單",
font,
new PdfSolidBrush(System.Drawing.Color.Black), 130, 10);
page.Canvas.DrawString("編號:31231",
font1,
new PdfSolidBrush(System.Drawing.Color.Black), 380, 60);
page.Canvas.DrawString("經辦人:XXXX",
font1,
new PdfSolidBrush(System.Drawing.Color.Black), 60, 250);
page.Canvas.DrawString("打印日期:2020/06/15",
font1,
new PdfSolidBrush(System.Drawing.Color.Black), 380, 250);
//設置單元格邊距
grid.Style.CellPadding = new PdfPaddings(1, 1, 4, 4);
//設置表格默認字體
grid.Style.Font = new PdfTrueTypeFont(new System.Drawing.Font("Microsoft Yahei", 12f), true);
//添加4行4列
PdfGridRow row1 = grid.Rows.Add();
PdfGridRow row2 = grid.Rows.Add();
PdfGridRow row3 = grid.Rows.Add();
PdfGridRow row4 = grid.Rows.Add();
PdfGridRow row5 = grid.Rows.Add();
PdfGridRow row6 = grid.Rows.Add();
grid.Columns.Add(4);
//設置列寬
foreach (PdfGridColumn col in grid.Columns)
{
col.Width = 120f;
}
//寫入數據 第一行第一個格式的值,第一行第二個格子的值
row1.Cells[0].Value = "收款單位";
row1.Cells[1].Value = "{DW}";
row2.Cells[0].Value = "收款單位";
row2.Cells[1].Value = "{DW}";
row3.Cells[0].Value = "匯款時間";
row3.Cells[1].Value = "2016/06/02";
row3.Cells[2].Value = "金額小寫";
row3.Cells[3].Value = "¥231";
row4.Cells[0].Value = "金額合計大寫";
row4.Cells[1].Value = "大蘇打實打實";
row5.Cells[0].Value = "用途:" +
"付XXXX2020年04月至2020年04月";
row6.Cells[0].Value = "提示:回單可重複打印,請勿重複XXX";
//row5.Cells[0].Height = (float)20;
//水平和垂直合併單元格 從那個格子開始合併幾個(包含當前格子)
row1.Cells[1].ColumnSpan = 3;
row2.Cells[1].ColumnSpan = 3;
row4.Cells[1].ColumnSpan = 3;
row5.Cells[0].ColumnSpan = 2;
row5.Cells[2].ColumnSpan = 2;
row6.Cells[0].ColumnSpan = 2;
row6.Cells[2].ColumnSpan = 2;
//這個是垂直合併,但是我之前合併的沒有效果
row5.Cells[1].RowSpan = 2;
//設置單元格內文字對齊方式
row1.Cells[0].StringFormat = new PdfStringFormat(PdfTextAlignment.Center);
row1.Cells[1].StringFormat = new PdfStringFormat(PdfTextAlignment.Center);
row2.Cells[0].StringFormat = new PdfStringFormat(PdfTextAlignment.Center);
row2.Cells[1].StringFormat = new PdfStringFormat(PdfTextAlignment.Center);
row3.Cells[0].StringFormat = new PdfStringFormat(PdfTextAlignment.Center);
row3.Cells[1].StringFormat = new PdfStringFormat(PdfTextAlignment.Center);
row3.Cells[2].StringFormat = new PdfStringFormat(PdfTextAlignment.Center);
row3.Cells[3].StringFormat = new PdfStringFormat(PdfTextAlignment.Center);
row4.Cells[0].StringFormat = new PdfStringFormat(PdfTextAlignment.Center);
row4.Cells[1].StringFormat = new PdfStringFormat(PdfTextAlignment.Center);
row5.Cells[0].StringFormat = new PdfStringFormat(PdfTextAlignment.Center);
row6.Cells[0].StringFormat = new PdfStringFormat(PdfTextAlignment.Center);
//設置單元格背景顏色
//row1.Cells[0].Style.BackgroundBrush = PdfBrushes.Gray;
//row3.Cells[3].Style.BackgroundBrush = PdfBrushes.Green;
//row4.Cells[3].Style.BackgroundBrush = PdfBrushes.MediumVioletRed;
//設置邊框顏色、粗細
PdfBorders borders = new PdfBorders();
borders.All = new PdfPen(System.Drawing.Color.Black, 0.1f);
foreach (PdfGridRow pgr in grid.Rows)
{
foreach (PdfGridCell pgc in pgr.Cells)
{
pgc.Style.Borders = borders;
}
}
//保存到文檔
//在指定為繪入表格
grid.Draw(page, new PointF(30, 80));
doc.SaveToFile(@"路徑");
//這句是在瀏覽器重打開這個PDF
System.Diagnostics.Process.Start(@"路徑");
}
保存我們看一下
2、之後就是關於PDF一些轉換的操作了(PDF轉base64,轉圖片之類的,我把代碼貼到下面)
- 這個用到了iTextSharp類庫,也可以在Nuget下載到
/// <summary>
/// 圖片轉pdf
/// </summary>
/// <param name="jpgfile"></param>
/// <param name="pdf"></param>
public static bool ConvertJPG2PDF(string jpgfile, string pdf)
{
try
{
var document = new iTextSharp.text.Document(iTextSharp.text.PageSize.A4, 25, 25, 25, 25);
using (var stream = new FileStream(pdf, FileMode.Create, FileAccess.Write, FileShare.None))
{
PdfWriter.GetInstance(document, stream);
document.Open();
using (var imageStream = new FileStream(jpgfile, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
var image = iTextSharp.text.Image.GetInstance(imageStream);
if (image.Height > iTextSharp.text.PageSize.A4.Height - 25)
{
image.ScaleToFit(iTextSharp.text.PageSize.A4.Width - 25, iTextSharp.text.PageSize.A4.Height - 25);
}
else if (image.Width > iTextSharp.text.PageSize.A4.Width - 25)
{
image.ScaleToFit(iTextSharp.text.PageSize.A4.Width - 25, iTextSharp.text.PageSize.A4.Height - 25);
}
image.Alignment = iTextSharp.text.Image.ALIGN_MIDDLE;
document.NewPage();
document.Add(image);
}
document.Close();
}
return true;
}
catch (Exception ex)
{
throw ex;
}
}
- 這個用的是(O2S.Components.PDFRender4NET)
/// <summary>
/// pdf轉img
/// </summary>
/// <param name="path">pdf位置</param>
/// <param name="path2">img位置</param>
public static void Pdf2Img(string path, string path2)
{
PDFFile pdfFile = PDFFile.Open(path);
//實例化一個PdfDocument類對象,並加載PDF文檔
using (Spire.Pdf.PdfDocument doc = new Spire.Pdf.PdfDocument())
{
doc.LoadFromFile(path);
//調用方法SaveAsImage()將PDF第一頁保存為Bmp格式
System.Drawing.Image bmp = doc.SaveAsImage(0);
// //調用另一個SaveAsImage()方法,並將指定頁面保存保存為Emf、Png
System.Drawing.Image emf = doc.SaveAsImage(0, Spire.Pdf.Graphics.PdfImageType.Bitmap);
System.Drawing.Image zoomImg = new Bitmap((int)(emf.Size.Width * 2), (int)(emf.Size.Height * 2));
using (Graphics g = Graphics.FromImage(zoomImg))
{
g.ScaleTransform(2.0f, 2.0f);
g.DrawImage(emf, new System.Drawing.Rectangle(new System.Drawing.Point(0, 0), emf.Size), new System.Drawing.Rectangle(new System.Drawing.Point(0, 0), emf.Size), GraphicsUnit.Pixel);
zoomImg.Save(path2, ImageFormat.Jpeg);
zoomImg.Dispose();
emf.Dispose();
bmp.Dispose();
}
doc.Close();
doc.Dispose();
}
}
- 這個和上面用的也是同一個(我覺得這個比較好用一些)
/// <summary>
/// 將PDF文檔轉換為圖片的方法
/// </summary>
/// <param name="pdfInputPath">PDF文件路徑</param>
/// <param name="imageOutputPath">圖片輸出路徑</param>
/// <param name="imageName">生成圖片的名字</param>
/// <param name="startPageNum">從PDF文檔的第幾頁開始轉換</param>
/// <param name="endPageNum">從PDF文檔的第幾頁開始停止轉換</param>
/// <param name="imageFormat">設置所需圖片格式</param>
/// <param name="definition">設置圖片的清晰度,数字越大越清晰</param>
public static void ConvertPDF2Image(string pdfInputPath, string imageOutputPath,
string imageName, int startPageNum, int endPageNum, ImageFormat imageFormat, Definition definition)
{
PDFFile pdfFile = null;
FileStream fs = null;
try
{
fs = new FileStream(pdfInputPath, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.ReadWrite);
pdfFile = PDFFile.Open(fs);
if (startPageNum <= 0)
{
startPageNum = 1;
}
if (endPageNum > pdfFile.PageCount)
{
endPageNum = pdfFile.PageCount;
}
if (startPageNum > endPageNum)
{
int tempPageNum = startPageNum;
startPageNum = endPageNum;
endPageNum = startPageNum;
}
string path = imageOutputPath + imageName + "1" + "." + imageFormat.ToString();
Logger.WriteLogs("PDFIMG:" + path);
using (Bitmap pageImage = pdfFile.GetPageImage(0, 56 * (int)definition))
{
if (!File.Exists(path))
{
using (FileStream f = new FileStream(path, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.ReadWrite))
{
pageImage.Save(f, ImageFormat.Jpeg);
pageImage.Dispose();
}
}
}
fs.Flush();
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
finally
{
if (pdfFile != null)
{
pdfFile.Dispose();
}
else if (fs != null)
{
fs.Close();
fs.Dispose();
}
}
}
public enum Definition
{
One = 1, Two = 2, Three = 3, Four = 4, Five = 5, Six = 6, Seven = 7, Eight = 8, Nine = 9, Ten = 10
}
- PDF轉Base64
-
/// <summary>
/// pdf轉base64
/// </summary>
/// <param name="filePath"></param>
/// <returns></returns>
public static string PdfWord_To_Base64(string filePath)
{
try
{
if (!string.IsNullOrWhiteSpace(filePath.Trim()))
{
FileStream fileStream = new FileStream(filePath, FileMode.OpenOrCreate);
byte[] bt = new byte[fileStream.Length];
fileStream.Read(bt, 0, bt.Length);
fileStream.Close();
fileStream.Dispose();
return Convert.ToBase64String(bt);
}
else
{
return "請輸入正確的路徑";
}
}
catch (Exception ex)
{
throw ex;
}
}
我主要也就用到這些,之後在發現,我在往上加
鏈接: https://pan.baidu.com/s/16xEpLBJ3-8fGjNPyvHUSmA
提取碼: p9qi
這個是O2S.Components.PDFRender4NET的文件,我看評論里有問的,之前忘記發了,網上有的是收費的,Nuget裏面帶後綴的我沒用過。
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