[英]How use conditions in Jsp <p:fileUpload
我需要检查上传文件的大小,类型,并将上传的文件名设置为fileUpload值标签。
我在uploadController中为它们编写了简单的函数,需要调用它们以检查文件的大小和类型。 是否有建议的方法来执行此文件验证?
<h:form enctype="multipart/form-data"> <p:growl id="messages" showDetail="true" /> <p:fileUpload // need set value after validating the file using BannerUpload.isPng() BannerUpload.checkMaxSize() value="#{BannerUpload.file}" mode="simple" skinSimple="true" /> <br/> <ui:fragment rendered="#{not empty BannerUpload.file}"> <img src="data:image/png;base64,#{BannerUpload.imageContentsAsBase64}" alt="" /> </ui:fragment> <br/> <p:commandButton action="#{BannerUpload.preview}" ajax="false" value="Preview" /> <br/> <p:commandButton value="Submit" ajax="false" action="#{BannerUpload.upload}" disabled="false" /> </h:form>
检查是否是图像? 或图像大小可以在浏览器端完成,在这里我找到了一个链接,例如 , 单击此处 ,您也可以使用控制器,但是对于大文件和示例javascript代码来说效果更好
function GetFileSize(fileid) {
try {
var fileSize = 0;
// for IE
if(checkIE()) { //we could use this $.browser.msie but since it's deprecated, we'll use this function
// before making an object of ActiveXObject,
// please make sure ActiveX is enabled in your IE browser
var objFSO = new ActiveXObject("Scripting.FileSystemObject");
var filePath = $("#" + fileid)[0].value;
var objFile = objFSO.getFile(filePath);
var fileSize = objFile.size; //size in b
fileSize = fileSize / 1048576; //size in mb
}
// for FF, Safari, Opeara and Others
else {
fileSize = $("#" + fileid)[0].files[0].size //size in b
fileSize = fileSize / 1048576; //size in mb
}
alert("Uploaded File Size is" + fileSize + "MB");
}
catch (e) {
alert("Error is :" + e);
}
}
要么
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