但即使在阅读并实施建议的解决方案后,我也无法完成这项工作.
问题:Web服务返回xml的xml:
<?xml version="1.0" encoding="utf-8"?> <string xmlns="http://tempuri.org/">"Now i am getting jsop string""2nd param"</string>
现在让我们将代码分成几部分:
远程服务器(IIS 7.0,.NET 4):
web.config中:
<?xml version="1.0"?> <configuration> <system.webServer> <modules> <add name="JsonHttpModule.JsonHttpModule" type="JsonHttpModule"/> </modules> </system.webServer> <system.web.extensions> <scripting> <webServices> <jsonSerialization maxJsonLength="102400"/> </webServices> </scripting> </system.web.extensions> <system.web> <compilation debug="true" targetFramework="4.0" /> <customErrors mode="Off"/> <webServices> <protocols> <add name="HttpGet"/> <add name="HttpPost"/> </protocols> </webServices> </system.web> </configuration>
网络服务:
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.Services; using System.Web.Script.Services; using JsonHttpModule; /// <summary> /// Summary description for JSONP_EndPoint /// </summary> [WebService(Namespace = "http://tempuri.org/")] [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] // To allow this Web Service to be called from script,using ASP.NET AJAX,uncomment the following line. [System.Web.Script.Services.ScriptService] public class MyService : System.Web.Services.WebService { [WebMethod] [ScriptMethod(UseHttpGet = true,ResponseFormat = ResponseFormat.Json)] public string Sum(string x,string y) { return x + y; } }
HttpModule类:
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.IO; using System.Text; /// <summary> /// Summary description for ContentTypeHttpModule /// </summary> namespace JsonHttpModule { public class JsonHttpModule : IHttpModule { private const string JSON_CONTENT_TYPE = "application/json; charset=utf-8"; public void dispose() { } public void Init(HttpApplication app) { app.BeginRequest += OnBeginRequest; app.EndRequest += new EventHandler(OnEndRequest); } public void OnBeginRequest(object sender,EventArgs e) { HttpApplication app = (HttpApplication)sender; HttpRequest request = app.Request; //Make sure we only apply to our Web Service if (request.Url.AbsolutePath.ToLower().Contains("MyService.asmx")) { if (string.IsNullOrEmpty(app.Context.Request.ContentType)) { app.Context.Request.ContentType = JSON_CONTENT_TYPE; } app.Context.Response.Write(app.Context.Request.Params["callback"] + "("); } } void OnEndRequest(object sender,EventArgs e) { HttpApplication app = (HttpApplication)sender; HttpRequest request = app.Request; if (request.Url.AbsolutePath.ToLower().Contains("MyService.asmx")) { app.Context.Response.Write(")"); } } } }
客户端(localhost):
<script> $(function () { $('#btn_test').click(function () { $.ajax({ url: "http://tonofweb.com/MyService.asmx/Sum",data: { x: JSON.stringify("Now i am getting jsop string"),y: JSON.stringify("2nd param") },dataType: "jsonp",success: function (json) { alert(json.d); },error: function () { alert("Hit error fn!"); } }); }); }); </script> <input id="btn_test" type="button" value="POST" />
解决方法
$.ajax({ url: "http://tonofweb.com/MyService.asmx/Sum",contentType: "application/json; charset=utf-8",data: { x: JSON.stringify("1"),y: JSON.stringify("2") },success: function (json) { alert(json.d); },error: function () { alert("Hit error fn!"); } });
注意我在请求设置中添加了contentType:“application / json; charset = utf-8”.
我已经通过浏览到http://tonofweb.com(目前返回403)来测试此代码,包括使用jQuerify bookmarklet的jQuery,然后首先运行您的问题中的代码(没有contentType),然后是我上面发布的代码(使用内容类型).
没有contentType:
<?xml version="1.0" encoding="utf-8"?> <string xmlns="http://tempuri.org/">"Now i am getting jsop string""2nd param"</string>
使用contentType:
{"d":"12"}
所以第二个至少会导致从服务器返回JSON.所以其他条件相同,我会说添加contentType.
有关返回JSON的要求的说明,请参见此处:
ASMX and JSON – Common mistakes and misconceptions
The HTTP request must declare a content-type of application/json. This
informs the ScriptService that it will receive its parameters as JSON
and that it should respond in kind.
现在您还有另一个问题,那就是请求在完成后调用错误函数.如果将dataType:“jsonp”更改为dataType:“json”,它将调用success函数.所以关于你的回调包装器的实现是错误的,因为jQuery不能像JSONP那样处理响应.
现在我没有看到响应中包含回调,对于JSONP,响应应该是这样的:
jQuery17106476630216930062_1326752446188({"d":"12"})
我注意到您正在链接到this post关于如何从Web服务执行JSONP响应,但您没有遵循建议:您不使用Response.Filter,而是使用Response.Write.
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