147 lines
7.8 KiB
HTML
147 lines
7.8 KiB
HTML
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<p>第一种：最简单的超链接方法，<a>标签的href直接指向目标文件地址，这样容易暴露地址造成盗链，这里就不说了</a></p>
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<p>第二种：后台下载</p>
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<p> </p>
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<p>在后台下载中又可以细分为几种下载方式</p>
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<p>首先，在前台，我们需要一个<a>标签</a></p>
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<div>
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<pre><a href="http://control.blog.sina.com.cn/admin/article/%3Cspan">"~/Home/download">Click to get file</a>
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</pre>
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</div>
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<p>Home为controller，download为action。</p>
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<p>如果需要传一些参数，可以：</p>
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<div>
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<pre><a href="http://control.blog.sina.com.cn/admin/article/%3Cspan">"~/Home/download?id=1">Click to get file</a>
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</pre>
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</div>
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<p> </p>
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<p>在后台：</p>
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<p>（1）返回filestream</p>
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<div>
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<div><a title="复制代码"><img src="https://common.cnblogs.com/images/copycode.gif" alt="复制代码" /></a></div>
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<pre>public FileStreamResult download()
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{
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string fileName = "aaa.txt";//客户端保存的文件名
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string filePath = Server.MapPath("~/Document/123.txt");//路径
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return File(new FileStream(filePath, FileMode.Open), "text/plain",
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fileName);
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}
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</pre>
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<div><a title="复制代码"><img src="https://common.cnblogs.com/images/copycode.gif" alt="复制代码" /></a></div>
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</div>
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<p>其中：“text/plain”是文件MIME类型</p>
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<p> </p>
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<p>（2）返回file</p>
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<div>
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<pre>public FileResult download()
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{
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string filePath = Server.MapPath("~/Document/123.txt");//路径
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return File(filePath, "text/plain", "welcome.txt"); //welcome.txt是客户端保存的名字
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}
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</pre>
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</div>
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<p> </p>
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<p>（3）TransmitFile方法</p>
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<div>
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<div><a title="复制代码"><img src="https://common.cnblogs.com/images/copycode.gif" alt="复制代码" /></a></div>
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<pre> 1 public void download()
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2 {
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3 string fileName = "aaa.txt";//客户端保存的文件名
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4 string filePath = Server.MapPath("~/Document/123.txt");//路径
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5 FileInfo fileinfo = new FileInfo(filePath);
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6 Response.Clear(); //清除缓冲区流中的所有内容输出
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7 Response.ClearContent(); //清除缓冲区流中的所有内容输出
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8 Response.ClearHeaders(); //清除缓冲区流中的所有头
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9 Response.Buffer = true; //该值指示是否缓冲输出，并在完成处理整个响应之后将其发送
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10 Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);
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11 Response.AddHeader("Content-Length",fileinfo.Length.ToString());
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12 Response.AddHeader("Content-Transfer-Encoding", "binary");
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13 Response.ContentType = "application/unknow"; //获取或设置输出流的 HTTP MIME 类型
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14 Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312"); //获取或设置输出流的 HTTP 字符集
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15 Response.TransmitFile(filePath);
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16 Response.End();
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17 }
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</pre>
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<div><a title="复制代码"><img src="https://common.cnblogs.com/images/copycode.gif" alt="复制代码" /></a></div>
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</div>
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<p> </p>
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<p>（4）Response分块下载</p>
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<div>
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<div><a title="复制代码"><img src="https://common.cnblogs.com/images/copycode.gif" alt="复制代码" /></a></div>
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<pre> 1 public void download()
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2 {
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3 string fileName = "aaa.txt";//客户端保存的文件名
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4 string filePath = Server.MapPath("~/Document/123.txt");//路径
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5
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6 System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);
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7 if (fileInfo.Exists == true)
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8 {
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9 const long ChunkSize = 102400;//100K 每次读取文件，只读取100K，这样可以缓解服务器的压力
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10 byte[] buffer = new byte[ChunkSize];
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11
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12 Response.Clear();
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13 System.IO.FileStream iStream = System.IO.File.OpenRead(filePath);
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14 long dataLengthToRead = iStream.Length;//获取下载的文件总大小
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15 Response.ContentType = "application/octet-stream";
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16 Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName));
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17 while (dataLengthToRead > 0 && Response.IsClientConnected)
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18 {
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19 int lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));//读取的大小
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20 Response.OutputStream.Write(buffer, 0, lengthRead);
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21 Response.Flush();
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22 dataLengthToRead = dataLengthToRead - lengthRead;
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23 }
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24 Response.Close();
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25 }
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26 }
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</pre>
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<div><a title="复制代码"><img src="https://common.cnblogs.com/images/copycode.gif" alt="复制代码" /></a></div>
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</div>
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<p> </p>
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<p><strong><input type="text" />+ajax方法</strong></p>
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<p>要重点说说这个方法，ajax返回不了文件流，所以说用ajax调用上面任意一种后台方法都要出问题，下载不了文件。</p>
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<p>所以，只能让后台返回所需下载文件的url地址，然后调用windows.location.href。</p>
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<p> </p>
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<p>优点：ajax可以传好几个参数（当然以json形式），传100个都无所谓。你要是用的方法传100得写死。。。（公司需求，至少要传100多个参数）</p>
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<p>缺点：支持下载exe,rar,msi等类型文件。对于txt则会直接打开，<strong>慎用！</strong>对于其他不常用的类型文件则直接报错。</p>
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<p> 所以我的建议是得到多个参数，通过数据库找到所有需要下载的文件然后压缩打包，然后返回url下载。（你要是一个一个给用户下，用户都疯了）</p>
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<p> <strong>！</strong>那么问题又来了，C#怎么用代码实现将本地的一些文件打包压缩到服务器目录下呢？这我不知道。</p>
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<p> 因为你只是单纯的放在目录文件夹下没有用的，我们平时在服务器某目录下添加某一个文件都是右键，添加XXX项这样，这样才能真正的将文件放在服务器中。</p>
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<p> 可是纯代码该怎么实现呢？？</p>
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<p> <strong>*</strong> 可能的解决方法：先在项目目录下放一个空的rar文件或者没什么功能的exe,msi文件，然后在后台打包完一些文件后去替换它，不知道可行不。</p>
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<p> （1）首先清空原压缩包中的内容</p>
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<p> （2）将文件压缩到压缩包中</p>
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<p> （3）返回 XXX.rar</p>
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<p> </p>
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<p>前端：</p>
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<div>
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<pre><input type="<span" />"button" id="downloaon"/>
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</pre>
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</div>
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<p>ajax:</p>
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<div>
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<div><a title="复制代码"><img src="https://common.cnblogs.com/images/copycode.gif" alt="复制代码" /></a></div>
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<pre>$("#downloaon").click(function () {
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$.ajax({
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type: "GET",
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url: "/Home/download",
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data: { id: "1" },
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dataType:"json",
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success: function (result) {
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window.location.target = "_blank";
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window.location.href = result;
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}
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})
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})
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</pre>
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<div><a title="复制代码"><img src="https://common.cnblogs.com/images/copycode.gif" alt="复制代码" /></a></div>
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</div>
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|||
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<p>后台：</p>
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<div>
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<pre>public string download(int id)
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{
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string filePath = "Document/123.msi";//路径
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return filePath;
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}
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</pre>
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</div>
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<p>这里，id是没有什么作用的，后台就别用什么server.Mappath了，肯定错。直接写服务器项目文件夹/文件名 即可。</p>
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