asp.net – 从Web应用程序打印

使用iTextSharp从头开始创建文档可能非常耗时.作为替代方案,您可以通过向其添加表单字段来创建(或重用)PDF“模板”文档(如果需要).最简单的方法是使用完整版的Adobe Acrobat,但您也可以使用iTextSharp添加可填写的表单字段.

例如,对于奖励或文凭,您可以查找,创建或修改包含文档的所有文本,图形,花式边框和字体的PDF,然后为收件人的名称添加表单字段.您可以为日期,签名行,奖励类型等添加其他字段.

然后,您可以非常轻松地使用Web应用程序中的iTextSharp填写表单,将其展平并将其流回用户.

在这篇文章的最后是一个完整的ASHX处理程序代码示例.

还要记住,iTextSharp(或只是iText)对于组合来自不同文档的PDF文档或页面也很有用.因此,对于具有封面或说明页面的固定设计但是动态生成内容的年度报告,您可以打开封面,打开报告的模板页面,在模板的空白区域生成动态内容,打开后页“样板”,然后将它们全部合并到一个文档中以返回给用户.

using System;
using System.Data;
using System.Web;
using System.Collections;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Text;
using iTextSharp;
using iTextSharp.text;
using iTextSharp.text.pdf;

namespace iTextFormFillerDemo
{
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    public class DemoForm : IHttpHandler
    {

        public void ProcessRequest(HttpContext context)
        {

            context.Response.ContentType = "application/pdf";
            //This line will force the user to either open or save the 
            //file instead of it appearing on its own page - if you remove it,//the page will appear in the browser in the same window.
            context.Response.AddHeader("Content-Disposition","attachment; filename=DemoForm_Filled.pdf");

            FillForm(context.Response.OutputStream);

            context.Response.End();
        }

        // Fills the form and pushes it out the output stream.
        private void FillForm(System.IO.Stream outputStream)
        {
            //Need to get the proper directory (dynamic path) for this file. 
            //This is a filesystem reference,not a web/URL reference...
            //The PDF reader reads in the fillable form
            PdfReader reader = new PdfReader("C:/DemoForm_Fillable.pdf");

            //The PDF stamper creates an editable working copy of the form from the reader 
            //and associates it with the response output stream
            PdfStamper stamper = new PdfStamper(reader,outputStream);

            //The PDF has a single "form" consisting of AcroFields
            //Note that this is shorthand for writing out 
            //stamper.AcroFields.SetField(...) for each set
            AcroFields form = stamper.AcroFields;

            //Set each of the text fields this way: SetField(name,value)
            form.SetField("txtFieldName","Field Value");
            form.SetField("txtAnotherFieldName","AnotherField Value");

            //Set the radio button fields using the names and string values:
            form.SetField("rbRadioButtons","Yes"); //or "No"

            //Form flattening makes the form non-editable and saveable with the 
            //form data filled in
            stamper.FormFlattening = true;

            //Closing the stamper flushes it out the output stream
            stamper.Close();

            //We're done reading the file
            reader.Close();
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}