C# webapi 文件流 stream 两种上传方式《第二部分 base64 图片上传》
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2.base64 图片上传
2.1 客户端
///
/// 接口保存图片
///
///
///
///
///
/// 2.2 webapi（附上整个代码）
[FromBody]
///
/// 图片上传
///
public class ImageSaveController : ApiController
{
///
/// 保存图片
///
//public class SaveImage
//{
private object _lock = new object();
///
/// 保存学习网图片
///
///
///
///
[HttpPost]
//public string SaveLearningImage(int pic_width, int pic_height, dynamic string bitMapData, int saveType = 4)
public string SaveLearningImage([FromBody] Object bit)
{
lock (_lock)
{
//JavaScriptSerializer jss = new JavaScriptSerializer();
//string myJson = jss.Serialize(bitMapData);
//return myJson;
string jsonstr = JsonConvert.SerializeObject(bit);
Data res = JsonConvert.DeserializeObject(jsonstr);
//Data res = new Data
//{
// BitMapData = ((Newtonsoft.Json.Linq.JContainer)(bit)).First
//};
return SavePhoto(res.pic_width, res.pic_height, res.BitMapData, res.saveType);
}
}
private class Data {
public string BitMapData { get; set; }
public int pic_width { get; set; }
public int pic_height { get; set; }
public int saveType { get; set; }
}
private string SavePhoto(int pic_width, int pic_height, string bitMapData, int saveType)
{
byte[] bitmap_data = Convert.FromBase64String(bitMapData);
int PhotoD = 170;
Stream stream = new MemoryStream(bitmap_data);
var m_pic = new Bitmap(stream);
string Year = System.DateTime.Now.Year.ToString();
string Month = System.DateTime.Now.Month.ToString();
string Day = System.DateTime.Now.Day.ToString();
string Hour = System.DateTime.Now.Hour.ToString();
string ConfigPath = "", filePath = "";
switch (saveType)
{
case 4:
{
ConfigPath = ConfigurationManager.AppSettings["LearPicPath"];
filePath = "/imagepath/onlinephoto/";
break;
}
case 1:
{
ConfigPath = ConfigurationManager.AppSettings["LearPicPath_Theory"];
filePath = "/";
break;
}
}
filePath += Year + "/" + Month + "/" + Day + "/" + Hour + "/";
//判断路径是否存在,若不存在则创建路径
DirectoryInfo upDir = new DirectoryInfo(ConfigPath + filePath);
if (!upDir.Exists)
{
upDir.Create();
}
//生成随机文件名
DateTime date = DateTime.Now;
string fileName = Guid.NewGuid().ToString() + ".jpg";
int towidth = pic_width;
int toheight = pic_height;
//towidth = PhotoD;
//toheight = PhotoD;
int width = pic_width;
int height = pic_height;
int x = 0;
int y = 0;
int ow = m_pic.Width;
int oh = m_pic.Height;
switch (ThumbnailMode.Cut)
{
case ThumbnailMode.HW://指定高宽缩放（可能变形）
break;
case ThumbnailMode.W://指定宽，高按比例
toheight = m_pic.Height * width / m_pic.Width;
break;
case ThumbnailMode.H://指定高，宽按比例
towidth = m_pic.Width * height / m_pic.Height;
break;
case ThumbnailMode.Cut://指定高宽裁减（不变形）
if ((double)m_pic.Width / (double)m_pic.Height > (double)towidth / (double)toheight)
{
oh = m_pic.Height;
ow = m_pic.Height * towidth / toheight;
y = 0;
x = (m_pic.Width - ow) / 2;
}
else
{
ow = m_pic.Width;
oh = m_pic.Width * height / towidth;
x = 0;
y = (m_pic.Height - oh) / 2;
}
break;
default:
break;
}
//新建一个bmp图片
System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);
//新建一个画板
Graphics g = System.Drawing.Graphics.FromImage(bitmap);
//设置高质量插值法
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
//设置高质量,低速度呈现平滑程度
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//清空画布并以透明背景色填充
g.Clear(Color.Transparent);
//在指定位置并且按指定大小绘制原图片的指定部分
g.DrawImage(m_pic, new Rectangle(0, 0, towidth, toheight),
new Rectangle(x, y, ow, oh),
GraphicsUnit.Pixel);
string fullPath = ConfigPath + filePath + fileName;
try
{
//以jpg格式保存缩略图
bitmap.Save(fullPath, System.Drawing.Imaging.ImageFormat.Jpeg);
}
catch (System.Exception e)
{
throw e;
}
finally
{
m_pic.Dispose();
bitmap.Dispose();
g.Dispose();
}
return filePath + fileName;
}
///
/// 缩略图格式
///
public enum ThumbnailMode
{
///
/// 指定高宽缩放（可能变形）。
///
HW,
///
/// 指定宽，高按比例。
///
W,
///
/// 指定高，宽按比例。
///
H,
///
/// 指定高宽裁减（不变形）。
///
Cut
}
}图片上传的比较简单，base64对图片来说，还是比较方便的，不论是前端还是后端。