普通文件的上传(表单上传和ajax文件异步上传)
一.表单上传:
html客户端部分:
<form action="upload.ashx" method="post" enctype="multipart/form-data">
选择文件:<input type="file" name="file1" /><br />
<input type="submit" value="上传" />
</form>
一般处理程序服务器端:
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
HttpPostedFile file1 = context.Request.Files["file1"];
helper.uploadFile(file1, "~/upload/");//这里就是对相应方法进行调用
context.Response.Write("ok");//提示执行成功
}
上传代码的封装:
/// <summary>
/// 上传图片
/// </summary>
/// <param name="file">通过form表达提交的文件</param>
/// <param name="virpath">文件要保存的虚拟路径</param>
public static void uploadImg(HttpPostedFile file,string virpath)
{
if (file.ContentLength > 1024 * 1024 * 4)
{
throw new Exception("文件不能大于4M");
}
string imgtype = Path.GetExtension(file.FileName);
if(imgtype!=".jpg"&&imgtype!=".jpeg") //图片类型进行限制
{
throw new Exception("请上传jpg或JPEG图片");
}
using (Image img = Bitmap.FromStream(file.InputStream))
{
string savepath = HttpContext.Current.Server.MapPath(virpath+file.FileName);
img.Save(savepath);
}
}
/// <summary>
/// 上传文件
/// </summary>
/// <param name="file">通过form表达提交的文件</param>
/// <param name="virpath">文件要保存的虚拟路径</param>
public static void uploadFile(HttpPostedFile file, string virpath)
{
if (file.ContentLength > 1024 * 1024 * 6)
{
throw new Exception("文件不能大于6M");
}
string imgtype = Path.GetExtension(file.FileName);
//imgtype对上传的文件进行限制
if (imgtype != ".zip" && imgtype != ".mp3")
{
throw new Exception("只允许上传zip、rar....文件");
}
string dirFullPath= HttpContext.Current.Server.MapPath(virpath);
if (!Directory.Exists(dirFullPath))//如果文件夹不存在,则先创建文件夹
{
Directory.CreateDirectory(dirFullPath);
}
file.SaveAs(dirFullPath + file.FileName);
}
二.Ajax文件异步上传:
注明:既然有了表单上传为什么又要ajax上传呢?因为表单上传过程中,整个页面就刷新了!ajax异步上传就可以达到只刷新局部位置,下面就简单看看ajax上传吧!
html客户端部分:
<head>
<script src="jquery-2.1.4.js"></script>
<script>
$(function () {
$("#upload").click(function () {
$("#imgWait").show();
var formData = new FormData();
formData.append("myfile", document.getElementById("file1").files[0]);
$.ajax({
url: "upload.ashx",
type: "POST",
data: formData,
/**
*必须false才会自动加上正确的Content-Type
*/
contentType: false,
/**
* 必须false才会避开jQuery对 formdata 的默认处理
* XMLHttpRequest会对 formdata 进行正确的处理
*/
processData: false,
success: function (data) {
if (data.status == "true") {
alert("上传成功!");
}
if (data.status == "error") {
alert(data.msg);
}
$("#imgWait").hide();
},
error: function () {
alert("上传失败!");
$("#imgWait").hide();
}
});
});
});
</script>
</head>
<body>
选择文件:<input type="file" id="file1" /><br />
<input type="button" id="upload" value="上传" />
<img src="wait.gif" style="display:none" id="imgWait" />
</body>
一般处理程序服务器端:
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/html";
if (context.Request.Files.Count > 0)
{
HttpPostedFile file1 = context.Request.Files["myfile"];
helper.uploadFile(file1, "~/upload/"); //这里引用的是上面封装的方法
WriteJson(context.Response, "true", "");
}
else
{
WriteJson(context.Response, "error", "请选择要上传的文件");
}
}
json代码封装:
public static void WriteJson(HttpResponse response,
string status1, string msg1, object data1 = null)
{
response.ContentType = "application/json";
var obj = new { status = status1, msg = msg1, data = data1 };
string json = new JavaScriptSerializer().Serialize(obj);
response.Write(json);
}