通过json传递图片(base64编码)

程序一：

后台代码：

  public ActionResult Index()
        {
            FileStream fs = new FileStream("e:\\file\\psb.jpg", FileMode.Open);
            byte[] t = StreamToBytes(fs);
            ViewBag.str = Convert.ToBase64String(t);
            return View();
        }
        public byte[] StreamToBytes(Stream stream)
        {
            byte[] bytes = new byte[stream.Length];
            stream.Read(bytes, 0, bytes.Length);
            // 设置当前流的位置为流的开始
            stream.Seek(0, SeekOrigin.Begin);
            return bytes;
        }

 前台代码：

@{
    ViewBag.Title = "Index";
}

<script src="~/gc-ui/js/gc-js/gc-js/jq_print/jquery-1.4.4.min.js"></script>
<script src="~/gc-ui/js/gc-js/gc-js/jq_json/jquery.json-2.4.min.js"></script>
<script>
    $(function () {
      var  json = {
          "MATERIALNAME": $("#MATERIALNAME").val(),
          "REMARK": $("#REMARK").val(),
          "IDRNTITYID": $("#IDRNTITYID").val(),
          "AFFAIRID": $("#AFFAIRID").val(),
          "BinaryImg":$("#BinaryImg").val()
        }
      $("#xc").val($.toJSON(json));
        $("form").submit(function () {
            alert();
        });
    });
</script>
<form method="post" action="xxx">
    <input id="MATERIALNAME"  value="sb" />
    <input id="REMARK"  value="sb" />
    <input id="IDRNTITYID"  value="70" />
    <input id="AFFAIRID"  value="511" />
    <input id="BinaryImg"  value="@ViewBag.str" />
    <input id="xc" name="json" type="hidden" value="" />
<button>测试<button>
</form>

程序二：

后台代码:

 //字符串转流
//m_l.BinaryImg程序一传过来的base64编码的图片文件流
//注意程序一请求要用post

                byte[] bt = Convert.FromBase64String(m_l.BinaryImg);
                System.IO.MemoryStream stream = new System.IO.MemoryStream(bt);
                //文件格式
                string fileName = DateTime.Now.ToString("yyyyMMddHHmmssfff") + ".jpg";
                string dicr = DateTime.Now.ToString("yyyy-MM-dd") + "/";
                string RetureVlue = dicr + fileName;
                string physicsPath = System.Configuration.ConfigurationManager.AppSettings["FilePath"];
                if (!Directory.Exists(physicsPath + dicr))
                {
                    Directory.CreateDirectory(physicsPath + dicr);
                }
                StreamToFile(stream, physicsPath + RetureVlue);

 

 

 public static void StreamToFile(Stream stream, string filepath)
        {
            byte[] bytes = StreamToBytes(stream);
            FileStream fileStream = new FileStream(filepath, FileMode.Create);
            fileStream.Write(bytes, 0, bytes.Length);
            fileStream.Flush();
            fileStream.Close();
        }

 本文实现的功能是通过json传递图片，并把接收到的图片保存下来。

我原本是想压缩一下字符串的。不过没找到一种java和.net通用的压缩和解压缩的算法。。

求大神指点。。。

 

jquery.json-2.4.min.js

/*! jQuery JSON plugin 2.4.0 | code.google.com/p/jquery-json */
(function ($) {
    'use strict'; var escape = /["\\\x00-\x1f\x7f-\x9f]/g, meta = { '\b': '\\b', '\t': '\\t', '\n': '\\n', '\f': '\\f', '\r': '\\r', '"': '\\"', '\\': '\\\\' }, hasOwn = Object.prototype.hasOwnProperty; $.toJSON = typeof JSON === 'object' && JSON.stringify ? JSON.stringify : function (o) {
        if (o === null) { return 'null'; }
        var pairs, k, name, val, type = $.type(o); if (type === 'undefined') { return undefined; }
        if (type === 'number' || type === 'boolean') { return String(o); }
        if (type === 'string') { return $.quoteString(o); }
        if (typeof o.toJSON === 'function') { return $.toJSON(o.toJSON()); }
        if (type === 'date') {
            var month = o.getUTCMonth() + 1, day = o.getUTCDate(), year = o.getUTCFullYear(), hours = o.getUTCHours(), minutes = o.getUTCMinutes(), seconds = o.getUTCSeconds(), milli = o.getUTCMilliseconds(); if (month < 10) { month = '0' + month; }
            if (day < 10) { day = '0' + day; }
            if (hours < 10) { hours = '0' + hours; }
            if (minutes < 10) { minutes = '0' + minutes; }
            if (seconds < 10) { seconds = '0' + seconds; }
            if (milli < 100) { milli = '0' + milli; }
            if (milli < 10) { milli = '0' + milli; }
            return '"' + year + '-' + month + '-' + day + 'T' +
            hours + ':' + minutes + ':' + seconds + '.' + milli + 'Z"';
        }
        pairs = []; if ($.isArray(o)) {
            for (k = 0; k < o.length; k++) { pairs.push($.toJSON(o[k]) || 'null'); }
            return '[' + pairs.join(',') + ']';
        }
        if (typeof o === 'object') {
            for (k in o) {
                if (hasOwn.call(o, k)) {
                    type = typeof k; if (type === 'number') { name = '"' + k + '"'; } else if (type === 'string') { name = $.quoteString(k); } else { continue; }
                    type = typeof o[k]; if (type !== 'function' && type !== 'undefined') { val = $.toJSON(o[k]); pairs.push(name + ':' + val); }
                }
            }
            return '{' + pairs.join(',') + '}';
        }
    }; $.evalJSON = typeof JSON === 'object' && JSON.parse ? JSON.parse : function (str) { return eval('(' + str + ')'); }; $.secureEvalJSON = typeof JSON === 'object' && JSON.parse ? JSON.parse : function (str) {
        var filtered = str.replace(/\\["\\\/bfnrtu]/g, '@').replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']').replace(/(?:^|:|,)(?:\s*\[)+/g, ''); if (/^[\],:{}\s]*$/.test(filtered)) { return eval('(' + str + ')'); }
        throw new SyntaxError('Error parsing JSON, source is not valid.');
    }; $.quoteString = function (str) {
        if (str.match(escape)) {
            return '"' + str.replace(escape, function (a) {
                var c = meta[a]; if (typeof c === 'string') { return c; }
                c = a.charCodeAt(); return '\\u00' + Math.floor(c / 16).toString(16) + (c % 16).toString(16);
            }) + '"';
        }
        return '"' + str + '"';
    };
}(jQuery));