文件流的使用

秒速五厘米 2022-05-08 00:03 164阅读 0赞

using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Web;
    using System.Web.Mvc;
    using System.IO;
    
    namespace WebApplication1.Controllers
    {
        public class FileStreamController : Controller
        {
            // GET: FileStream
            /// <summary>
            /// 获取指定目录下的文件
            /// </summary>
            /// <returns></returns>
            public ActionResult Index()
            {
                string filePath = Server.MapPath("~" + "/Files");
                DirectoryInfo dirInfo = new DirectoryInfo(filePath);
                //FileInfo[] file = dirInfo.GetFiles();//读取所有文件
                FileInfo[] file = dirInfo.GetFiles("*.txt");//读取指定类型的文件
                Dictionary<string, string> dic = new Dictionary<string, string>();
                foreach (var item in file)
                {
                    string name = item.Name;//文件名称
                    int index = name.LastIndexOf('.');
                    string fileName = name.Substring(0, index);
                    dic.Add(name, fileName);//item.FullName  该文件的完整目录
                }
                ViewBag.dic = dic;//传值到页面
                return View(dic);
            }
    
           /// <summary>
           /// 读取文件内容
           /// </summary>
           /// <param name="fileName">文件名称  有带后缀哟</param>
           /// <returns></returns>
            public ActionResult ReadContent(string fileName)
            {
                string filePath = Server.MapPath("~" + "/Files/" + fileName);
                //通过文件路径获取文件内容
                FileStream fs = new FileStream(filePath, FileMode.Open);
                //借助直接获取字符串的流  ps：文本编码不能使用UTF8 使用UTF8会乱码
                StreamReader reader = new StreamReader(fs, System.Text.Encoding.Default);
                List<string> contentList = new List<string>();
                //循环读取文件内容
                while (reader.EndOfStream == false)//reader.EndOfStream  判断当前流的位置是否在文件流的末尾
                {
                    string content = reader.ReadLine();//读取一行文件数据
                    contentList.Add(content);
                }
                ViewData["contentList"] = contentList;
                int index = fileName.LastIndexOf('.');
                ViewData["fileName"] = fileName.Substring(0, index);
                //ViewData["contnet"]= reader.ReadToEnd();//读取文件的内容  缺点：不会换行  
                //关闭流
                reader.Close();
                fs.Close();
                return View();
            }
    
            /// <summary>
            /// 读取文件内容
            /// </summary>
            /// <param name="fileName">文件名称  有带后缀哟</param>
            /// <returns></returns>
            public ActionResult ReadContent2(string fileName)
            {
                string filePath = Server.MapPath("~" + "/Files/" + fileName);
                List<string> contentList = new List<string>();
                //通过文件路径获取文件内容         
                using (FileStream fs = new FileStream(filePath, FileMode.Open))
                {
                    //借助直接获取字符串的流
                    using (StreamReader reader = new StreamReader(fs, System.Text.Encoding.Default))
                    {
                        //循环读取文件内容
                        while (reader.EndOfStream == false)//reader.EndOfStream  判断当前流的位置是否在文件流的末尾
                        {
                            string content = reader.ReadLine();//读取一行文件数据
                            contentList.Add(content);
                        }
                    }
                }
                ViewData["contentList"] = contentList;
                int index = fileName.LastIndexOf('.');
                ViewData["fileName"] = fileName.Substring(0, index);
                //ViewData["contnet"]= reader.ReadToEnd();//读取文件的内容  缺点：不会换行  
                return View();
            }
    
            /// <summary>
            /// 创建文件并写入文件内容
            /// </summary>
            /// <returns></returns>
            public ActionResult WriteContent()
            {
                string fileName = DateTime.Now.AddDays(2).ToLongDateString() + ".txt";
                string filePath = Server.MapPath("~" + "/Files/" + fileName);     //文件路径
                #region 判断是否存在该文件
                判断是否存在该文件
                //if (!System.IO.File.Exists(filePath))
                //{
                //    //DirectoryInfo dirInfo = new DirectoryInfo(filePath);
                //    //dirInfo.Create();//创建目录 
                //    //Directory.CreateDirectory(filePath);//创建该文件夹下的所有目录及子目录
                //    System.IO.File.CreateText(filePath);//创建一个文本
                //}
                #endregion
    
                //创建文件流   FileMode.OpenOrCreate  有就打开，没有就创建
                FileStream fs = new FileStream(filePath, FileMode.OpenOrCreate);
                #region 直接写入文件文件内容会被覆盖
                创建写入器，将文件流传入写入器
                //StreamWriter write = new StreamWriter(fs);
                //{
                //    write.WriteLine("时间："+DateTime.Now);
                //    write.WriteLine("内容："+"laall");
                //    write.WriteLine("-----------------------------------");
                //}
                //write.Close();
                #endregion
                fs.Close();
                //追加内容到现有文件或新文件
                StreamWriter write = System.IO.File.AppendText(filePath);
                write.WriteLine("时间：" + DateTime.Now);
                write.WriteLine("内容：" + "laall");
                write.WriteLine("-----------------------------------");
                write.Close();
    
                return View();
            }
        }
    }

**获取指定目录下的文件页面代码：**

@{
        ViewBag.Title = "Index";
        Dictionary<string, string> dic = ViewBag.dic;
    }
    @model   System.Collections.Generic.Dictionary<string, string>
    
    
    <h4>model传值方式</h4>
    @{
        foreach (var item in Model)
        {
            <div><a href="~/FileStream/ReadContent?fileName=@item.Key">@item.Value</a></div>
        }
    }
    <hr />
    <h4>ViewBag传值方式</h4>
    @{
        foreach (var item in dic)
        {
            <div><a href="~/FileStream/ReadContent?fileName=@item.Key">@item.Value</a></div>
        }
    }

![70][]

**读取文件内容页面代码：**

@{
        ViewBag.Title = "ReadContent";
        // var contnet = ViewData["contnet"];
        List<string> contentList = ViewData["contentList"] as List<string>;
        string fileName = ViewData["fileName"].ToString();
    }
    
    <h4>@fileName</h4>
    @*<div>@contnet</div>*@
    @{ 
        foreach (var item in contentList)
        {
            <div>@item</div>
        }
    }

效果如下图所示:

![70 1][]

[70]: /images/20220508/5ebe7260c7384c00bdd957c58114ff7c.png
[70 1]: /images/20220508/e16389b1aebb44098384c80d390f15e8.png