C#导出pdf的实现方法(浏览器不预览直接下载)
作者:好名字可以让你的朋友更容易记住你 时间:2023-11-04 05:48:10
前言
这篇文章主要给大家介绍了关于C#导出pdf的实现方法,分享出来供大家参考学习,下面话不多说了,来一起看看详细的介绍吧
方法如下:
一.接口部分的代码
[HttpGet]
public HttpResponseMessage ExportPdf(string id)
{
string pdfName = "";
//id 查询条件,根据实际情况修改即可
//pdfName 例如download.pdf
byte[] pdfData= _policyGapManagerService.ExportPdf(id, out pdfName);//获得pdf字节
var result = new HttpResponseMessage(HttpStatusCode.OK)
{
Content = new ByteArrayContent(pdfData)
};
result.Content.Headers.ContentDisposition =
new ContentDispositionHeaderValue("attachment")
{
FileName = pdfName
};
result.Content.Headers.ContentType =new MediaTypeHeaderValue("application/pdf");
return result;
}
二.返回pdfbyte数组
1.下载http模式的pdf文件(以ASP.NET为例,将PDF存在项目的目录下,可以通过http直接打开项目下的pdf文件)
#region 调用本地文件使用返回pdfbyte数组
/// <summary>
/// 调用本地文件使用返回pdfbyte数组
/// </summary>
/// <param name="srcPdfFile">‘D:\in2434341555551.pdf'</param>
/// <returns></returns>
public static byte[] GetSignaturePDFByte(string srcPdfFile)
{
using (FileStream fsRead = new FileStream(srcPdfFile, FileMode.Open, FileAccess.Read, FileShare.Read))
{
int fsLen = (int)fsRead.Length;
byte[] hebyte = new byte[fsLen];
fsRead.Read(hebyte, 0, hebyte.Length);
return hebyte;
}
}
#endregion 调用本地文件使用返回pdfbyte数组
#region 从网站上下载pdf,转化为字节流
/// <summary>
/// 从网站上下载pdf,转化为字节流
/// </summary>
/// <param name="srcPdfFile">文件地址:'https://******/group2/M00/00/04/wKj-mlpcoZ2IUbK5AACrpaV6k98AAAB6gAAAAAAAKu9562.pdf'</param>
/// <returns></returns>
public static Byte[] GetByteByRemoteURL(string srcPdfFile)
{
byte[] arraryByte;
HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(srcPdfFile);
req.Method = "GET";
using (WebResponse wr = req.GetResponse())
{
StreamReader responseStream = new StreamReader(wr.GetResponseStream(), Encoding.UTF8);
int length = (int)wr.ContentLength;
byte[] bs = new byte[length];
HttpWebResponse response = wr as HttpWebResponse;
Stream stream = response.GetResponseStream();
//读取到内存
MemoryStream stmMemory = new MemoryStream();
byte[] buffer1 = new byte[length];
int i;
//将字节逐个放入到Byte 中
while ((i = stream.Read(buffer1, 0, buffer1.Length)) > 0)
{
stmMemory.Write(buffer1, 0, i);
}
arraryByte = stmMemory.ToArray();
stmMemory.Close();
}
return arraryByte;
}
#endregion 从网站上下载pdf,转化为字节流
#region 从网站上下载文件,保存到其他路径
/// <summary>
/// 从网站上下载文件,保存到其他路径
/// </summary>
/// <param name="pdfFile">文件地址</param>
/// <param name="saveLoadFile">保存文件路径:D:\12221.pdf</param>
/// <returns></returns>
public string SaveRemoteFile( string saveLoadFile , string pdfFile)
{
//bool flag = false;
var f = saveLoadFile + Guid.NewGuid().ToString("D") + ".pdf";
Uri downUri = new Uri(pdfFile);
//建立一个WEB请求,返回HttpWebRequest对象
HttpWebRequest hwr = (HttpWebRequest)WebRequest.Create(downUri);
//流对象使用完后自动关闭
using (Stream stream = hwr.GetResponse().GetResponseStream())
{
//文件流,流信息读到文件流中,读完关闭
using (FileStream fs = File.Create(f))
{
//建立字节组,并设置它的大小是多少字节
byte[] bytes = new byte[102400];
int n = 1;
while (n > 0)
{
//一次从流中读多少字节,并把值赋给N,当读完后,N为0,并退出循环
n = stream.Read(bytes, 0, 10240);
fs.Write(bytes, 0, n);//将指定字节的流信息写入文件流中
}
}
}
//return flag;
//return _outPath + saveLoadFile;
return f;
}
#endregion 从网站上下载文件,保存到其他路径
2.ftp模式的pdf文件
/// <summary>
/// 下载FTP文件。
/// </summary>
/// <param name="offsetPath">相对路径</param>
/// <param name="fileName">文件名称</param>
/// <returns>下载结果,本地文件路径</returns>
public string DownLoad(string offsetPath,string fileName)
{
try
{
FtpWebRequest ftpWeb = (FtpWebRequest)WebRequest.Create(_ftpRootPath + offsetPath + fileName);
ftpWeb.Method = WebRequestMethods.Ftp.DownloadFile;
ftpWeb.UseBinary = true;
var resp = ftpWeb.GetResponse();
using (FileStream fs = new FileStream(_outPath + fileName, FileMode.Create))
{
using (var s = resp.GetResponseStream())
{
if (s == null) { return "文件不存在!"; }
int readCout = 0;
byte[] bytes = new byte[1024];
readCout = s.Read(bytes, 0, 1024);
while (readCout > 0)
{
fs.Write(bytes, 0, readCout);
readCout = s.Read(bytes, 0, 1024);
}
}
}
resp.Close();
return _outPath + fileName;
}
catch (Exception e)
{
return e.Message;
}
}
/// <summary>
/// 判断文件是否存在
/// </summary>
/// <param name="offsetPath"></param>
/// <param name="fileName"></param>
/// <returns></returns>
public bool FileExists(string offsetPath, string fileName)
{
try
{
FtpWebRequest ftpWeb = (FtpWebRequest)WebRequest.Create(_ftpRootPath + offsetPath + fileName);
ftpWeb.Method = WebRequestMethods.Ftp.DownloadFile;
ftpWeb.UseBinary = true;
var resp = (FtpWebResponse)ftpWeb.GetResponse();
resp.Close();
return true;
}
catch (Exception)
{
return false;
}
}
/// <summary>
/// 获取目录下所有文件
/// </summary>
/// <returns></returns>
public string[] Files(string offsetPath)
{
try
{
FtpWebRequest ftpWeb = (FtpWebRequest)WebRequest.Create(_ftpRootPath + offsetPath);
ftpWeb.Method = WebRequestMethods.Ftp.ListDirectory;
Stream stream = ftpWeb.GetResponse().GetResponseStream();
if (stream == null)
{
return null;
}
List<string> fileList = new List<string>();
using (StreamReader sr = new StreamReader(stream))
{
StringBuilder sb = new StringBuilder();
do
{
sb.Append(sr.ReadLine());
if (sb.Length > 0)
{
fileList.Add(sb.ToString());
sb.Clear();
}
else
{
break;
}
} while (true);
}
return fileList.ToArray();
}
catch (Exception)
{
return null;
}
}
来源:https://www.cnblogs.com/hahahayang/p/12053913.html
标签:c#,导出,pdf
0
投稿
猜你喜欢
带你了解Java常用类小结
2023-04-15 14:38:26
springboot集成redis并使用redis生成全局唯一索引ID
2023-11-28 05:42:39
Java concurrency之非公平锁_动力节点Java学院整理
2022-07-31 22:04:37
一文带你了解C#中抽象方法与虚方法的区别
2023-07-23 00:14:32
JAVA swing布局管理器实例解析
2022-01-11 05:05:15
Java即将引入新对象类型来解决内存使用问题
2023-03-30 18:12:42
Java算法比赛常用方法实例总结
2023-11-28 07:15:26
不使用他人jar包情况下优雅的进行dubbo调用详解
2022-04-20 11:43:46
用java实现杨辉三角的示例代码
2023-08-12 09:02:21
Java的枚举类型使用方法详解
2023-11-19 04:32:55
C语言安全编码之数组索引位的合法范围
2021-12-08 06:09:51
应用启动数据初始化接口CommandLineRunner和Application详解
2023-02-06 05:00:33
Java中数组在内存中存放原理的讲解
2022-12-10 03:48:35
Gson之toJson和fromJson方法的具体使用
2021-07-20 16:28:47
浅析C# 函数的传值与传址
2023-11-22 04:46:57
Android实现三角形气泡效果方式汇总
2021-12-20 06:21:51
解决Map集合使用get方法返回null抛出空指针异常问题
2023-11-25 00:14:00
Android Application的使用全面解析
2023-08-26 04:23:49
java中this的n种使用方法
2023-12-23 13:13:23
AOP从静态代理到动态代理(Emit实现)详解
2023-11-27 14:49:56