脚本宝典收集整理的这篇文章主要介绍了form 表单和ajax中的post请求&&后台获取数据方法（深度好文），脚本宝典觉得挺不错的，现在分享给大家，也给大家做个参考。

https://blog.csdn.net/xcymorningsun/article/details/53019425

@H_834_126@
<form action="Handler2.ashx" method="post" enctype="application/x-www-form-urlencoded">

2、multipart/form-data方法

<form action="Handler2.ashx" method="post" enctype="multipart/form-data">
<p><input type="text" name="str" value="一个字符串，别管它" /></p>
<p>要上传的文件１<input type="file" name="file1"/></p>
<p>要上传的文件２<input type="file" name="file2"/></p>
<p><input type="submit" value="提交" /></p>
</form>

3、json方法

    3.1 form表单数据可以直接json序列化VAR queryArray = $(formElement).serializeArray();

    3.2 也可以在k-v中的v中添加实际值，当然这个违背了form表单多个k-v的初衷，但是也可以实现

二、ajax实现（含后端）

1、application/x-www-form-urlencoded方法(json与kv)

 var data={     "Books": [         { "language":"Java" , "edition":"second" },         { "language":"C++" , "lastName":"fifth" },         { "language":"C" , "lastName":"third" }     ] }
        $.ajax({
            type: "post",
            url: "http://localhost:39870/api/test/getUrlencode",
            contentType : "application/x-www-form-urlencoded; charset=UTF-8",
            data: { books: JSON.stringify(data), txtPass: "123" },
            success: function (res) {
 
                //alert(res);
                //layer.close(ii);
            }
        });

        [HttpPost]
        public IHttpActionResult getFormdata()
        {
 
            string id = HttpContext.current.Request["id"];
            string name = HttpContext.Current.Request["name"];
 
            return Ok("success2");
        }

            HttPRequest request = HttpContext.Current.Request;
            Stream stream = request.InputStream;
            StreamReader streamReader = new StreamReader(stream);
            string JSON = string.Empty;
            json = streamReader.ReadToEnd();
            json = HttpUtility.UrlDecode(json);

"books=%7B%22books%22%3A%5B%7B%22language%22%3A%22Java%22%2C%22edition%22%3A%22second%22%7D%2C%7B%22language%22%3A%22C%2B%2B%22%2C%22lastName%22%3A%22fifth%22%7D%2C%7B%22language%22%3A%22C%22%2C%22lastName%22%3A%22third%22%7D%5D%7D&txtPass=123" 进行编码后数据为：

"books={"books":[{"language":"Java","edition":"second"},{"language":"C++","lastName":"fifth"},{"language":"C","lastName":"third"}]}&txtPass=123"

2、multipart/form-data方法

		 var data = new FormData();
		 var files = $("#fileUpload").get(0).files;
        data.append("id","001");
        var name={     "books": [         { "language":"Java" , "edition":"second" },         { "language":"C++" , "lastName":"fifth" },         { "language":"C" , "lastName":"third" }     ] };
        data.append("name",JSON.stringify(name));
        if(files.length > 0){
            for (var i = 0; i < files.length;i++){
                data.append(i.toString(), files[i]);
            }
        }
        $.ajax({
            type: "post",
            url: "http://localhost:39870/api/test/getFormdata",
            contentType: false,
            cache: false,
            currentType: false,
            proceSSData: false,
            data: data,
            success: function (res) {
 
                //alert(res);
            }
        });

后台获取数据

            string id=HttpContext.Current.Request["id"];
            string name = HttpContext.Current.Request["name"];
            HttpFileCollection files = HttpContext.Current.Request.Files;
 
            foreach (string key in files.AllKeys)
            {
                HttpPosteDFile file = files[key];
                if (string.IsNullOrEmpty(file.FileName) == false)
                {
                    
                    string path = HttpContext.Current.Server.MapPath("~/App_Data/") + file.FileName;
                    string path2 = HttpContext.Current.Request.Url.Authority+"/" + file.FileName;
                    string path3 = "C:/Users/xcy/Desktop/金阁寺需求分析/" + file.FileName;
                    file.SaveAs(path3);
                }  
            }

此种方法可以接受kv数据，类json数据和文件，数据并未进行url编码。可以用下面方法验证：

            HttpRequest request = HttpContext.Current.Request;
            Stream stream = request.InputStream;
            StreamReader streamReader = new StreamReader(stream);
            string json = string.Empty;
            json = streamReader.ReadToEnd();
            json = HttpUtility.UrlDecode(json);

"------webkitFormBoundaryB4I0wChQCc6LwykMrnContent-Disposition: form-data; name="id"rnrn001rn------WebKitFormBoundaryB4I0wChQCc6LwykMrnContent-Disposition: form-data; name="name"rnrn{"books":[{"language":"Java","edition":"second"},{"language":"C++","lastName":"fifth"},{"language":"C","lastName":"third"}]}rn------WebKitFormBoundaryB4I0wChQCc6LwykM--rn"

进行url编码之后没有变化，为：

"------WebKitFormBoundaryB4I0wChQCc6LwykMrnContent-Disposition: form-data; name="id"rnrn001rn------WebKitFormBoundaryB4I0wChQCc6LwykMrnContent-Disposition: form-data; name="name"rnrn{"books":[{"language":"Java","edition":"second"},{"language":"C  ","lastName":"fifth"},{"language":"C","lastName":"third"}]}rn------WebKitFormBoundaryB4I0wChQCc6LwykM--rn"

3、json方法

        var data={"books":[{"language":"Java","edition":"second"},{"language":"C++","lastName":"fifth"},{"language":"C","lastName":"third"}]};
        $.ajax({
            type: "post",
            url: "http://localhost:39870/api/test/gettest3",
            contentType: "application/json; charset=utf-8",
            cache: false,
            data: JSON.stringify(data),
            success: function (res) {
 
            }
        });

注意JOSN.stringify()，不添加都会失败，直接传的是url编码后的原字符串。这里插播一下字符串与对象转换

JSON.stringify(obj)将JSON转为字符串。

JSON.parse(string)将字符串转为JSON格式

例子：

var a={"name":"tom","sex":"男","age":"24"};
 
var b='{"name":"Mike","sex":"女","age":"29"}';
 
var aToStr=JSON.stringify(a);
 
var BToObj=JSON.parse(b);
 
alert(typeof(aToStr));  //string
 
alert(typeof(bToObj));//object

看完后就知道为什么要用JSON.stringify(obj)了，因为我们要穿的是字符串，而代码中data变量原来是js对象，so要变一下啦

而且JSON.stringify()会自动添加转义符，比如我们在一个字段包含"或者的时候，如下：

    var temp={
        "F_CODE": "001",
        "F_REGION_CODE": "001",
        "F_ZTPG": "小"东哥很'",
        "F_PGZS": "string",
        "F_PIC": "string",
        "F_FILE": "string",
        "F_TYPE": "string",
        "F_PROJECT_CODE": "string",
        "F_TIME": "2017-05-24T03:23:11.555Z"
    };
    var tt=JSON.stringify(temp);

后台接收方法

3.1

        public IHttpActionResult getTest4([FromBody]object jdata)
        {
            //dynamic 
            return Ok("ddd");
        }

前台的contenttype必须设置为json，此为WebAPI的方式，这种方式添加FromBody这个参数，会针对contenttype为json的post请求自动拦截，如果当contenttype不为json，则会影响后面stream正常获取，即：如果在上面代码中添加楼下的代码，在下面的代码中是获取不到json数据的===

    3.2

            HttpRequest request = HttpContext.Current.Request;
            Stream stream = request.InputStream;
            StreamReader streamReader = new StreamReader(stream);
            string json = string.Empty;
            json = streamReader.ReadToEnd();

这种方法在前两种的方法中已经提到过，用stream的方式获取方法比较通用，这个方法是万能的，v5===

后来想了想还是request是王道，其他的好多都是在他基础上扩展的，目前知道request主要有流和参数获取两种

===============================================================================================

有小伙伴们问get请求的事儿，顺便写了下

第一种：json对象

    $(document).ready(function(){
        var data={
            "F_CODE": "1",
            "F_NAME": "xcy"
        };
        $.ajax({
            type: "get",
            url: "http://localhost:27110/test/formbody",
            cache: false,
            data: data,
            success: function (res) {
 
            }
        });
 
    });

第二种：url

    $(document).ready(function(){
        $.ajax({
            type: "get",
            url: "http://localhost:27110/test/formbody?F_CODE=1&&F_NAME=xcy",
            cache: false,
            data: data,
            success: function (res) {
 
            }
        });
 
    });

这里一定要将data里面设置为json对象，不要json.stringify加工，这样才能放到url链接后面，不然直接把json字符串放进去了，如下：

http://localhost:27110/test/formbody?{%22F_CODE%22:%221%22,%22F_NAME%22:%22xcy%22}&_=1495087390056

后台处理

第一种：与webapi无关

            string name = HttpContext.Current.Request["F_CODE"];

第二种：webapi参数绑定

        [HttpGet]
        public IHttpActionResult formbody(string F_CODE)
        {
 
            return Ok(F_CODE);
        }

不是很难，注意一点的是get请求不用设置contenttype，因为contenttype是针对body的，既然body没了，contenttype自然没效果了。

总结了一天的时间来搞post前台提交后台接受问题，基本用途够了，还需进一步理解，希望大牛斧正==