如何解决使用 iText7 和 ASP NET C#
这是数据库 t_contents_2021 上的表 MysqL version 8.0.17
-- ----------------------------
-- Table structure for t_contents_2021
-- ----------------------------
DROP TABLE IF EXISTS `t_contents_2021`;
CREATE TABLE `t_contents_2021` (
`contents` varchar(1000) DEFAULT NULL,`sUnity` varchar(255) DEFAULT NULL,`sID_content_image` varchar(255) DEFAULT NULL,`sID_content_image_link` varchar(255) DEFAULT NULL,`sID_content_ppt` varchar(255) DEFAULT NULL,`sID_content_ppt_link` varchar(255) DEFAULT NULL,`sID_content_xls` varchar(255) DEFAULT NULL,`sID_content_xls_link` varchar(255) DEFAULT NULL,`sID_content_pdf` varchar(255) DEFAULT NULL,`sID_content_pdf_link` varchar(255) DEFAULT NULL,`sID` int(11) NOT NULL AUTO_INCREMENT,PRIMARY KEY (`sID`) USING BTREE,UNIQUE INDEX `contents`(`contents`) USING BTREE
) ENGINE = InnoDB;
-- ----------------------------
-- Records of t_contents_2021
-- ----------------------------
INSERT INTO `t_contents_2021` VALUES ('Set 1','Q400',NULL,1);
INSERT INTO `t_contents_2021` VALUES ('- Par 1.1',2);
INSERT INTO `t_contents_2021` VALUES ('<b>bold text</b>',3);
INSERT INTO `t_contents_2021` VALUES ('- Par 1.2',4);
INSERT INTO `t_contents_2021` VALUES ('normal text',5);
INSERT INTO `t_contents_2021` VALUES ('Set 2',6);
INSERT INTO `t_contents_2021` VALUES ('- Par 2.1',7);
INSERT INTO `t_contents_2021` VALUES ('<i>italic text</i>',8);
INSERT INTO `t_contents_2021` VALUES ('- Par 2.2',9);
INSERT INTO `t_contents_2021` VALUES ('<u>underline text</u>',10);
在字段 t_contents_2021 的表 contents 上有一些 html 代码
<b>bold text</b>
<i>italic text</i>
<u>underline text</u>
现在我使用 iText (Version 7.1.13) 将 html 转换为 pdf 使用 HtmlConverter (html2pdf version 2.0.1)
string filename;
string html;
string dest;
Paragraph contents;
protected void Page_Load(object sender,EventArgs e)
{
PdfWriter writer = new PdfWriter(Response.OutputStream);
PdfDocument pdf = new PdfDocument(writer);
Document document = new Document(pdf);
using (MysqLConnection cn =
new MysqLConnection(ConfigurationManager.ConnectionStrings["cn"].ConnectionString))
{
using (MysqLCommand cmd =
new MysqLCommand("SP",cn))
{
cmd.Connection.open();
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("tunity","Q400");
MysqLDataReader reader = cmd.ExecuteReader();
if (reader.HasRows)
{
while (reader.Read())
{
contents = new Paragraph(reader.GetString("contents"))
.SetTextAlignment(TextAlignment.JUSTIFIED)
.SetFontSize(12);
if (reader.GetString("contents").StartsWith("Set"))
{
contents.SetFontSize(12)
.SetBold()
.SetFontColor(ColorConstants.BLUE);
document.Add(newline);
}
else if (reader.GetString("contents").StartsWith("- "))
{
contents.SetFontSize(10)
.SetBold()
.SetFontColor(ColorConstants.BLACK);
document.Add(newline);
}
else
{
contents.SetFontSize(10)
.SetFontColor(ColorConstants.BLACK);
}
if (!String.IsNullOrEmpty(reader["sID_content_image"].ToString()))
{
Image image_path = new Image(ImageDataFactory
.Create(reader["sID_content_image"].ToString()))
.SetTextAlignment(TextAlignment.CENTER);
image_path.SetAutoScale(false);
image_path.SetBorderLeft(new SolidBorder(ColorConstants.DARK_GRAY,2));
image_path.SetBorderRight(new SolidBorder(ColorConstants.DARK_GRAY,2));
image_path.SetBorderTop(new SolidBorder(ColorConstants.DARK_GRAY,2));
image_path.SetBorderBottom(new SolidBorder(ColorConstants.DARK_GRAY,2));
document.Add(image_path);
}
if (!String.IsNullOrEmpty(reader["sID_content_ppt"].ToString()))
{
string IMG1 = "C:\\inetpub\\wwwroot\\aspnet\\img\\powerpoint-png-picture-2.jpg";
Image img1 = new Image(ImageDataFactory.Create(IMG1));
Table tablelink = new Table(UnitValue.CreatePercentArray(1)).UseAllAvailableWidth();
PdfFont font = PdfFontFactory.CreateFont(StandardFonts.HELVETICA_BOLD);
Cell cell = new Cell().Add(img1.SetAutoScale(false));
cell.SetHorizontalAlignment(HorizontalAlignment.CENTER);
img1.SetHorizontalAlignment(HorizontalAlignment.CENTER);
cell.SetBorder(Border.NO_BORDER);
cell.SetAction(PdfAction.CreateURI(
reader["sID_content_ppt_link"].ToString()));
tablelink.AddCell(cell);
document.Add(tablelink);
document.Add(newline);
}
if (!String.IsNullOrEmpty(reader["sID_content_xls"].ToString()))
{
string IMG1 = "C:\\inetpub\\wwwroot\\img\\excel-2.png";
Image img1 = new Image(ImageDataFactory.Create(IMG1));
Table tablelink = new Table(UnitValue.CreatePercentArray(1)).UseAllAvailableWidth();
PdfFont font = PdfFontFactory.CreateFont(StandardFonts.HELVETICA_BOLD);
Cell cell = new Cell().Add(img1.SetAutoScale(false));
cell.SetHorizontalAlignment(HorizontalAlignment.CENTER);
img1.SetHorizontalAlignment(HorizontalAlignment.CENTER);
cell.SetBorder(Border.NO_BORDER);
cell.SetAction(PdfAction.CreateURI(
reader["sID_content_xls_link"].ToString()));
tablelink.AddCell(cell);
document.Add(tablelink);
document.Add(newline);
}
if (!String.IsNullOrEmpty(reader["sID_content_pdf"].ToString()))
{
string IMG1 = "C:\\inetpub\\wwwroot\\img\\pdf-png-picture-2.gif";
Image img1 = new Image(ImageDataFactory.Create(IMG1));
Table tablelink = new Table(UnitValue.CreatePercentArray(1)).UseAllAvailableWidth();
PdfFont font = PdfFontFactory.CreateFont(StandardFonts.HELVETICA_BOLD);
Cell cell = new Cell().Add(img1.SetAutoScale(false));
cell.SetHorizontalAlignment(HorizontalAlignment.CENTER);
img1.SetHorizontalAlignment(HorizontalAlignment.CENTER);
cell.SetBorder(Border.NO_BORDER);
cell.SetAction(PdfAction.CreateURI(
reader["sID_content_pdf_link"].ToString()));
tablelink.AddCell(cell);
document.Add(tablelink);
document.Add(newline);
}
document.Add(contents);
}
filename = @"C:\\inetpub\\wwwroot\\public\\Management_" + Guid.NewGuid() + ".pdf";
html = contents.ToString();
dest = filename.ToString();
HtmlConverter.ConvertToPdf(html,new FileStream(dest,FileMode.Create));
}
else
{
Console.WriteLine("No rows found.");
}
reader.Close();
cmd.Connection.Close();
}
}
document.Close();
Response.Clear();
Response.ContentType = "application/pdf";
Response.AppendHeader("Content-disposition","attachment; filename=" + dest);
Response.TransmitFile(dest);
Response.End();
}
生成的 pdf 文件 Management_14a40257-547f-4b6f-b991-eaa4aeb47a9a.pdf 不包含表 t_contents_2021 中的值，但仅包含此文本：
如果不在我的代码中使用 HtmlConverter.ConvertToPdf
filename = @"C:\\inetpub\\wwwroot\\public\\Management_" + Guid.NewGuid() + ".pdf";
html = contents.ToString();
dest = filename.ToString();
HtmlConverter.ConvertToPdf(html,FileMode.Create));
帮我搞定
这是 MysqL 中的 Stored procedure
CREATE DEFINER=`root`@`localhost` PROCEDURE `SP`(IN tunity CHAR(100))
BEGIN
SET @s = CONCAT('SELECT * FROM t_contents_2021 WHERE sUnity = \'',tunity,'\';');
PREPARE stmt FROM @s;
EXECUTE stmt;
DEALLOCATE PREPARE `stmt`;
END
解决方法
这行代码有误：
;html = contents.ToString();
是一个 contents 对象；对其调用 iText.Layout.Element.Paragraph 会返回类型的名称。将该字符串转换为 PDF 会产生您看到的输出。
您需要找到另一个 API 来将 .ToString() 保存为 PDF。
版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 dio@foxmail.com 举报，一经查实，本站将立刻删除。
