HttpClient-post请求，含图片

简单粗暴，直接上代码吧

//这是提交post的

public String GetImageStr(String imgFilePath)
{
//图片路径
string path = @"E:MyProjectCommonHelpWebApiDemoimg1.jpg";
FileInfo file = new FileInfo(path);
var stream = file.OpenRead();
byte[] buffer = new byte[file.Length];
//读取图片字节流
stream.Read(buffer, 0, Convert.ToInt32(file.Length));
//将base64字符串保存到base64.txt文件中
StreamWriter sw = new StreamWriter(@"E:MyProjectCommonHelpWebApiDemoimgase64.txt", false, Encoding.UTF8);
//将字节流转化成base64字符串
string base64=Convert.ToBase64String(buffer);

var request = (HttpWebRequest)WebRequest.Create("http://localhost:2349/api/UserApi/UploadHead");
var postData = "UserInfoId=94";
postData += "&Base64="+base64;
postData += "&SuffixType=jpg";
var data = Encoding.ASCII.GetBytes(postData);

request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = data.Length;

using (var streams = request.GetRequestStream())
{
streams.Write(data, 0, data.Length);
}

var response = (HttpWebResponse)request.GetResponse();

var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
return responseString.ToString();
}

//这是接口提供方

public ImageDto UploadImage(UploadImageDto uploadImageDto)
{
uploadImageDto.Base64 = uploadImageDto.Base64.Replace(' ', '+');
string path = string.Format("/UploadImge/" + DateTime.Now.ToString("yyyyMMdd") + "/");
byte[] imgByte = Convert.FromBase64String(uploadImageDto.Base64);
MemoryStream ms = new MemoryStream(imgByte);
Image image = System.Drawing.Image.FromStream(ms);
string fileName = string.Format("{0}." + uploadImageDto.SuffixType, DateTime.Now.ToString("yyyyMMddhhmmssffff") + RandomHelper.GenerateCheckCodeNum(6));
string filePath = string.Format("{0}{1}", path, fileName);
string serverPath = HttpContext.Current.Server.MapPath("~" + path);
if (!Directory.Exists(serverPath))
{
Directory.CreateDirectory(serverPath);
}
//保存图片
image.Save(serverPath + fileName);
string ImageUrl = WebConfigHelper.GetAppSettingsInfo("ImageUrl");
int ImgInfoId = _baseImgInfoService.Insert(new BaseImgInfoEntity
{
CreateTime = DateTime.Now,
Path = filePath,
Title = "接口图片上传",
Type = 0,
Source = ImageUrl
});
return new ImageDto { ImageId = ImgInfoId, Source = ImageUrl, Path = filePath, Title = "接口图片上传" };
}

//注意！！！！这里必须把‘ ’空格替换成‘+’加号，具体情况未明

uploadImageDto.Base64 = uploadImageDto.Base64.Replace(' ', '+');

转换成Base64之后进行UrlEncode编码即可

string text = System.Web.HttpUtility.UrlEncode("heart", System.Text.Encoding.UTF8); //UrlEncode编码
string data = System.Web.HttpUtility.UrlDecode(text, System.Text.Encoding.UTF8); //UrlDecode解码