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📜  Primefaces Fileupload

📅  最后修改于: 2021-01-08 04:44:45             🧑  作者: Mango

PrimeFace FileUpload

它是一个输入组件，用于将文件上传到服务器。它允许我们将文件从浏览器上传到服务器。它包括HTML5功能，并具有带有进度栏和其他有用按钮的漂亮用户界面。

PrimeFaces通过检测选择最合适的上载引擎，并且可以强制一个或另一个使用可选的配置参数。

组件用于在JSF应用程序中创建文件上传按钮。

FileUpload属性

Attribute Default value Type Description
required false Boolean It is used to mark component as required.
validator null MethodExpr It is used to set validator for the component.
requiredMessage null String It is used to set message to be displayed when required field
validation fails.
update null String It is used to set update after fileupload completes.
process null String It is used to set process in fileupload request.
fileUploadListener null MethodExpr A method to invoke when a file is uploaded.
multiple false Boolean It allows choosing of multiple file uploads from native
file browse dialog.
auto false Boolean It is used to set file uploading automatically.
label choose String It is a label of the browse button.
allowTypes null String It is used to set the allows types for file.
sizeLimit null Integer It is used to set file size limit.
fileLimit null Integer It is used to set maximum number of files allowed to upload.
invalidSizeMessage null String It is used to set message to display when size limit exceeds.
fileLimitMessage null String It is used to set message to display when file limit exceeds.
accept null String It is used to set filters files in native file browser dialog.
sequential false Boolean It is used to allow sequential file uploads.

例

在下面的示例中，我们正在实现组件。本示例包含以下文件。

JSF文件

// fileUpload.xhtml





File Uploads

ManagedBean

// FileUpload.java

package com.javatpoint;
import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.context.FacesContext;
import org.primefaces.event.FileUploadEvent; 
@ManagedBean
public class FileUpload {
public void handleFileUpload(FileUploadEvent event) {
FacesMessage message = new FacesMessage("Succesful", event.getFile().getFileName() + " is uploaded.");
FacesContext.getCurrentInstance().addMessage(null, message);
}
}

输出：

单击选择按钮并上传文件。

单击上载按钮，将开始上载。

上传完成后，它会显示一条消息。