POST 方式上传图片
Post 方式 模仿 form表单 上传 图片 设置enctype = multipart/form-data
<form enctype="multipart/form-data"></form>
自定义 MultipartFormData 类 （4.5以上版本好像有这个类 类名称叫啥忘记了）
/// <summary>
/// multipart/form-data 数据类型
/// </summary>
public class MultipartFormData
{
public static string ContentType = "multipart/form-data; boundary=A300x";
private string headerStream = "--A300x\r\nContent-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: application/octet-stream\r\n\r\n";
private string footerString = "--A300x--\r\n";
private string compart = "\r\n";
private string headerString = "--A300x\r\nContent-Disposition: form-data; name=\"{0}\"\r\n\r\n";
private List<byte> lists = new List<byte>();
private byte[] footerBytes;
private byte[] comparts;
public MultipartFormData()
{
footerBytes = Encoding.UTF8.GetBytes(footerString);
comparts = Encoding.UTF8.GetBytes(compart);
}
public byte[] Buffer
{
get
{
return lists.ToArray();
}
}
private bool IsEnd = false;
/// <summary>
///
/// </summary>
public void End()
{
if (!IsEnd)
{
IsEnd = true;
//lists.AddRange(footerBytes.ToList());
this.AddRanges(footerBytes);
}
}
public void AddRanges(byte[] array) {
foreach (byte b in array)
lists.Add(b);
}
/// <summary>
/// 向序列化到多部/窗体数据 MIME 类型的 对象集合添加 HTTP 内容
/// </summary>
/// <param name="content">要添加到集合中的 HTTP 内容</param>
/// <param name="name">要添加的 HTTP 内容的名称</param>
public void Add(string content, string name)
{
byte[] headerBytes = Encoding.UTF8.GetBytes(String.Format(headerString, name));
this.AddRanges(headerBytes);
byte[] buffer = Encoding.UTF8.GetBytes(content);
this.AddRanges(buffer);
this.AddRanges(comparts);
}
/// <summary>
/// 向序列化到多部/窗体数据 MIME 类型的 对象集合添加 HTTP 内容
/// </summary>
/// <param name="content">要添加到集合中的 HTTP 内容</param>
/// <param name="name">要添加的 HTTP 内容的名称</param>
/// <param name="fileName">要添加到集合中的 HTTP 内容的文件名</param>
public void Add(Stream content, string name, string fileName)
{
byte[] headerBytes = Encoding.UTF8.GetBytes(String.Format(headerStream, name, fileName));
this.AddRanges(headerBytes);
byte[] buffer = new byte[content.Length];
content.Read(buffer, 0, buffer.Length);
content.Seek(0, SeekOrigin.Begin);
this.AddRanges(buffer);
this.AddRanges(comparts);
}
/// <summary>
/// 向序列化到多部/窗体数据 MIME 类型的 对象集合添加 HTTP 内容
/// </summary>
/// <param name="content">要添加到集合中的 HTTP 内容</param>
/// <param name="name">要添加的 HTTP 内容的名称</param>
/// <param name="fileName">要添加到集合中的 HTTP 内容的文件名</param>
public void Add(byte[] content, string name, string fileName)
{
byte[] headerBytes = Encoding.UTF8.GetBytes(String.Format(headerStream, name, fileName));
this.AddRanges(headerBytes);
this.AddRanges(content);
this.AddRanges(comparts);
}
}
上传图片代码
/// <summary>
/// form-data 数据类型传递数据
/// </summary>
private MultipartFormData multiparFormData = new MultipartFormData();
/// <summary>
/// 键值对应
/// </summary>
/// <param name="key"></param>
/// <param name="value"></param>
public void AddFormData(string key, string value)
{
this.multiparFormData.Add(value, key);
}
/// <summary>
/// 传递一个 strem 类型
/// </summary>
/// <param name="key"></param>
/// <param name="value"></param>
/// <param name="fileName"></param>
public void AddFormData(string key, Stream value, string fileName)
{
this.multiparFormData.Add(value, key, fileName);
}
/// <summary>
/// 传递一个 byte[] 类型
/// </summary>
/// <param name="key"></param>
/// <param name="value"></param>
/// <param name="fileName"></param>
public void AddFormData(string key, byte[] value, string fileName)
{
this.multiparFormData.Add(value, key, fileName);
}
private static CookieContainer m_Cookie = new CookieContainer();
/// <summary>
/// POST form-data 方式请求消息
/// </summary>
/// <param name="url"></param>
/// <param name="isHttps"></param>
/// <returns></returns>
public string PostFromData(string url, bool isHttps) {
try
{
multiparFormData.End();
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
request.Method = "POST";
request.ContentType = MultipartFormData.ContentType;
request.CookieContainer = m_Cookie;//设置上一个访问页面的cookie 保持session
request.ContentLength = multiparFormData.Buffer.Length;
Stream stream = request.GetRequestStream();
stream.Write(multiparFormData.Buffer, 0, multiparFormData.Buffer.Length);
stream.Close();
WebResponse response = request.GetResponse();
Stream streamResponse = response.GetResponseStream();
StreamReader sr = new StreamReader(streamResponse);
return sr.ReadToEnd();
}
catch (Exception ex) {
Log.WriteLog("POST form-data 方式请求消息:" + ex.Message);
return "error";
}
}