FileEncoding.cs
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using OnlineStore.Common;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
namespace OnlineStore.LoadCSVLibrary
{
public class FileEncoding
{
public static bool WriteFile(string filePath, string[] lines)
{
try
{
//备份保存
try
{
if (File.Exists(filePath))
{
FileInfo file = new FileInfo(filePath);
string date = DateTime.Now.ToString("yyyy-MM-dd");
string targetBackPath = @"C:\configBack\" + date + @"\";
if (!Directory.Exists(targetBackPath))
{
Directory.CreateDirectory(targetBackPath);
}
string fileName = file.Name;
string backFile = targetBackPath + fileName;
if (File.Exists(backFile))
{
File.Delete(backFile);
}
File.Copy(filePath, backFile, true);
}
}
catch (Exception e)
{
LogUtil.error(" WritteFile备份文件 filePath 出错：", e);
}
if (File.Exists(filePath))
{
File.Delete(filePath);
}
File.WriteAllLines(filePath, lines, Encoding.UTF8);
}
catch (Exception ex)
{
LogUtil.error("WriteFile ["+filePath+"] error :" +ex.ToString());
return false;
}
return true;
}
public static string[] GetFileLines(string filePath)
{
if (!File.Exists(filePath))
{
return new string[] { };
}
Encoding encoding = Encoding.UTF8;
if (!FileEncoding.GetType(filePath).Equals(Encoding.UTF8))
{
encoding = Encoding.GetEncoding("gb2312");
}
string[] lines = File.ReadAllLines(filePath, encoding);
return lines;
}
/// <summary>
/// 给定文件的路径，读取文件的二进制数据，判断文件的编码类型
/// </summary>
/// <param name=“FILE_NAME“>文件路径</param>
/// <returns>文件的编码类型</returns>
public static System.Text.Encoding GetType(string FILE_NAME)
{
FileStream fs = new FileStream(FILE_NAME, FileMode.Open, FileAccess.Read);
Encoding r = GetType(fs);
fs.Close();
return r;
}
/// <summary>
/// 通过给定的文件流，判断文件的编码类型
/// </summary>
/// <param name=“fs“>文件流</param>
/// <returns>文件的编码类型</returns>
public static System.Text.Encoding GetType(FileStream fs)
{
byte[] Unicode = new byte[] { 0xFF, 0xFE, 0x41 };
byte[] UnicodeBIG = new byte[] { 0xFE, 0xFF, 0x00 };
byte[] UTF8 = new byte[] { 0xEF, 0xBB, 0xBF }; //带BOM
Encoding reVal = Encoding.Default;
BinaryReader r = new BinaryReader(fs, System.Text.Encoding.Default);
int i;
int.TryParse(fs.Length.ToString(), out i);
byte[] ss = r.ReadBytes(i);
if (IsUTF8Bytes(ss) || (ss[0] == 0xEF && ss[1] == 0xBB && ss[2] == 0xBF))
{
reVal = Encoding.UTF8;
}
else if (ss[0] == 0xFE && ss[1] == 0xFF && ss[2] == 0x00)
{
reVal = Encoding.BigEndianUnicode;
}
else if (ss[0] == 0xFF && ss[1] == 0xFE && ss[2] == 0x41)
{
reVal = Encoding.Unicode;
}
r.Close();
return reVal;
}
/// <summary>
/// 判断是否是不带 BOM 的 UTF8 格式
/// </summary>
/// <param name=“data“></param>
/// <returns></returns>
private static bool IsUTF8Bytes(byte[] data)
{
int charByteCounter = 1; //计算当前正分析的字符应还有的字节数
byte curByte; //当前分析的字节.
for (int i = 0; i < data.Length; i++)
{
curByte = data[i];
if (charByteCounter == 1)
{
if (curByte >= 0x80)
{
//判断当前
while (((curByte <<= 1) & 0x80) != 0)
{
charByteCounter++;
}
//标记位首位若为非0 则至少以2个1开始 如:110XXXXX...........1111110X
if (charByteCounter == 1 || charByteCounter > 6)
{
return false;
}
}
}
else
{
//若是UTF-8 此时第一位必须为1
if ((curByte & 0xC0) != 0x80)
{
return false;
}
charByteCounter--;
}
}
if (charByteCounter > 1)
{
throw new Exception("非预期的byte格式");
}
return true;
}
}
}