jsonp

json获取响应头方法，用于参考，与下面的jsonp无关：

$.ajax({
    type: 'HEAD',// 获取头信息，type=HEAD即可
    url: "http://192.168.2.254/t.html",complete: function (xhr,data) {
        // 获取相关Http Response header
        var wpoInfo = {
            // 服务器端时间
            "sessionID": xhr.getResponseHeader('Set-Cookie'),"date": xhr.getResponseHeader('Date'),// 如果开启了gzip，会返回这个东西
            "contentEncoding": xhr.getResponseHeader('Content-Encoding'),// keep-alive ？ close？
            "connection": xhr.getResponseHeader('Connection'),// 响应长度
            "contentLength": xhr.getResponseHeader('Content-Length'),// 服务器类型，apache？lighttpd？
            "server": xhr.getResponseHeader('Server'),"vary": xhr.getResponseHeader('Vary'),"transferEncoding": xhr.getResponseHeader('Transfer-Encoding'),// text/html ? text/xml?
            "contentType": xhr.getResponseHeader('Content-Type'),"cacheControl": xhr.getResponseHeader('Cache-Control'),// 生命周期？
            "exprires": xhr.getResponseHeader('Exprires'),"lastModified": xhr.getResponseHeader('Last-Modified')
        };
        console.log(wpoInfo);
        // 在这里，做想做的事。。。
    }
});

响应过来的编码若与接收的不一致，需设置好渲染编码：

$.ajaxSetup({ scriptCharset: 'utf-8' });

    $.ajaxSetup({ ajaxSettings: { contentType: "application/x-www-form-urlencoded;chartset=gb2312" } });
    $.getJSON("http://192.168.2.254/api/android?callback=?",{
        "question": $('li.checked').map(function () { return $(this).text() }).get().join(','),"description": $('#area').val(),"contact": $('input').val(),"device": "android"
    },function (data) {  window.android.Tip(JSON.stringify(data));  });

using System;
using System.IO; 
using System.Net.Http.Formatting;
using System.Net.Http.Headers; 
using System.Threading.Tasks;
using System.Web;

public class JsonpMediaTypeFormatter : JsonMediaTypeFormatter 
{ 
    private string _callbackQueryParamter; 
    public JsonpMediaTypeFormatter() 
    { 
        SupportedMediaTypes.Add(DefaultMediaType); 
        SupportedMediaTypes.Add(new MediaTypeWithQualityHeaderValue("text/javascript")); 
        MediaTypeMappings.Add(new UriPathExtensionMapping("jsonp",DefaultMediaType)); 
    }
    
    public string CallbackQueryParameter
    { 
        get { return _callbackQueryParamter ?? "callback"; }
        set { _callbackQueryParamter = value; }
    } 
    
    public override System.Threading.Tasks.Task WriteToStreamAsync(Type type,object value,System.IO.Stream writeStream,System.Net.Http.HttpContent content,System.Net.TransportContext transportContext)
    { 
        string callback;
        if (IsJsonpRequest(out callback))
        { 
            return Task.Factory.StartNew(() => {
                var writer = new StreamWriter(writeStream);
                writer.Write(callback + "("); 
                writer.Flush(); 
                base.WriteToStreamAsync(type,value,writeStream,content,transportContext).Wait();
                writer.Write(")"); 
                writer.Flush(); 
            }); 
        } 
        return base.WriteToStreamAsync(type,transportContext); 
    } 
    
    private bool IsJsonpRequest(out string callback)
    { 
        callback = null; 
        switch (HttpContext.Current.Request.HttpMethod) 
        { 
            case "POST": callback = HttpContext.Current.Request.Form[CallbackQueryParameter];  break;
            default: callback = HttpContext.Current.Request.QueryString[CallbackQueryParameter]; break;
        }
        return !string.IsNullOrEmpty(callback); 
    } 

}

GlobalConfiguration.Configuration.Formatters.Insert(0,new JsonpMediaTypeFormatter()); //set webAPI request return json or jsonp for APP

  public class APPController : ApiController
  {
    private class Tip
    {
      public bool status { get; set; }
      public string content { get; set; }
    }

    Tip[] tip = new Tip[]{
        new Tip {status = false,content = "服务器出错，请稍候重试！"},new Tip {status = true,content = "提交成功！"},};
    // api/APP?question=1&description=1&contact=1&device=1
    public HttpResponseMessage Get(string callback,string question,string description,string contact,string device)
        {         
            try { return Request.CreateResponse(HttpStatusCode.OK,tip[1]); }
            catch { return Request.CreateResponse(HttpStatusCode.OK,tip[0]); }
        }

    // api/APP?APPuserName=1&APPpwd=1&APPdevice=1
    public HttpResponseMessage Get(string APPuserName,string APPpwd,string APPdevice)
    {
      try {
        Conn db_conn = new Conn();
        var rs = (from u in db_conn.userInfo.Where(a => a.loginName == APPuserName)
              join s in db_conn.company on u.userID equals s.userID into s
              from l in s.DefaultIfEmpty()
              select new{
                userID = u.userID,loginName = u.loginName,pwd = u.password,status = u.status,company = l,}).FirstOrDefault();
        if (rs == null) return Request.CreateResponse(HttpStatusCode.OK,new { status = false,content = "用户名不存在！" });
        else if (rs.pwd == Encryption.EncryptString(APPpwd)){
          LoginManager.Login(new string[] { rs.userID.ToString(),rs.loginName,rs.status,rs.company == null ? null : rs.company.companyID.ToString(),APPdevice,Regex.IsMatch(APPuserName,@"^1[3|4|5|8]d{9}$") ? APPuserName : null });
          return Request.CreateResponse(HttpStatusCode.OK,new { status = true,content = Domain.vip });
        }else return Request.CreateResponse(HttpStatusCode.OK,content = "密码错误！" });
      }catch { return Request.CreateResponse(HttpStatusCode.OK,tip[0]); }
    }
  }

参考以下c# .net jsonp：

webForm jsonp应用：http://www.52php.cn/article/p-vnvpxlju-zd.html

webForm jsonp(启用cookie)：http://www.aspzz.cn/article/28517.htm

MVC3 jsonp： http://download.csdn.net/detail/zxhouyi010101/4885318

webAPI jsonp(需MVC .net4.5)应用：http://www.2cto.com/kf/201312/262552.html

webAPI jsonp(需MVC 未试验)应用：http://weblog.west-wind.com/posts/2012/Apr/02/Creating-a-JSONP-Formatter-for-ASPNET-Web-API?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+RickStrahl+(Rick+Strahl%27s+WebLog)

MVC jsonp(实验过能用)：http://www.25kx.com/art/1908976

（编辑：李大同）

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