我正在使用JSF 2.0开发一个应用程序，并使用Primefaces组件库。但是，我遇到了Primefaces Library的 p：fileUpload 组件的问题。我基本上试图实现以下目标。
用户在点击上传按钮后上传.xls文件 该文件应保存到磁盘中的临时位置。
接下来，当单击提交按钮时，将读取保存的文件 使用Apache POI逐行并保存到数据库中。
但是，单击上传按钮按钮后文件会消失。作为JSF / Primefaces的新手，我无法弄清楚我要走向何方？
最糟糕的部分是没有收到错误消息，我可以看到JSF生命周期的所有阶段都在执行。 非常感谢任何帮助!!! 以下是我的代码
的index.html
<h:body>
<h:form prependId="false" enctype="multipart/form-data" id="welcomeForm" style="width:800px">
<h4 style="color:red; font-family:Arial"><h:outputLabel value="Upload your file:" /></h4>
<p:growl id="growl" showDetail="true" />
<p:fileUpload fileUploadListener="#{fileUploadBean.handleFileUpload}"
mode="advanced"
dragDropSupport="false"
sizeLimit="100000" fileLimit="3"
allowTypes="/(\.|\/)(xls|xlsx|docx|doc)$/"
update="growl"
/>
<p:separator/>
<p:commandButton value="Submit" actionListener="#{fileUploadBean.growlMessage}" update="growl" />
<h:message for="welcomeForm" />
</h:form>
FileUploadBean.java
public class FileUploadBean implements Serializable {
private static final long serialVersionUID = 1L;
private String message;
private UploadedFile uploadedFile;
private String myFileName;
public FileUploadBean(){
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public UploadedFile getUploadedFile() {
return uploadedFile;
}
public void setUploadedFile(UploadedFile uploadedFile) {
this.uploadedFile = uploadedFile;
}
public void growlMessage(){
FacesContext context = FacesContext.getCurrentInstance();
context.addMessage(null, new FacesMessage("Your " + myFileName +"was uploaded successfully") ); }
public void handleFileUpload(FileUploadEvent event) throws IOException {
System.out.println("Reached here:::::");
String name = uploadedFile.getFileName();
System.out.println("File name: " + name);
String type = uploadedFile.getContentType();
System.out.println("File type: " + type);
long size = uploadedFile.getSize();
System.out.println("File size: " + size);
Path folder = Paths.get("C:/Windows/Temp");
String filename = FilenameUtils.getBaseName(uploadedFile.getFileName());
String extension = FilenameUtils.getExtension(uploadedFile.getFileName());
Path file = Files.createTempFile(folder, filename + "-", "." + extension);
try (InputStream input = uploadedFile.getInputstream()) {
Files.copy(input, file, StandardCopyOption.REPLACE_EXISTING);
}
System.out.println("Uploaded file successfully saved in " + file);
FacesMessage msg = new FacesMessage("Succesful", event.getFile()
.getFileName() + " is uploaded.");
FacesContext.getCurrentInstance().addMessage(null, msg);
System.out.println("last line of file upload....");
}
public String save() throws IOException {
System.out.println("Uploaded file value ::::"+uploadedFile);
if(uploadedFile != null) {
FacesMessage message = new FacesMessage("Succesful", uploadedFile.getFileName() + " is uploaded.");
FacesContext.getCurrentInstance().addMessage(null, message);
}
else{
/*String filename = FilenameUtils.getName(e.getFile().getFileName());
System.out.println("Filename is :::: " +filename);*/
System.out.println("Uploaded File Name Is :: "+uploadedFile.getFileName()+" :: Uploaded File Size :: "+uploadedFile.getSize());
System.out.println("FAILED !!!!! FAILED !!!!! FAILED !!!!!");
}
return "true";
}
web.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
<display-name>file_uploading</display-name>
<servlet>
<servlet-name>Faces Servlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>/faces/*</url-pattern>
</servlet-mapping>
<context-param>
<description>State saving method: 'client' or 'server' (=default). See JSF Specification 2.5.2</description>
<param-name>javax.faces.STATE_SAVING_METHOD</param-name>
<param-value>client</param-value>
</context-param>
<context-param>
<param-name>javax.servlet.jsp.jstl.fmt.localizationContext</param-name>
<param-value>resources.application</param-value>
</context-param>
<context-param>
<param-name>javax.faces.PROJECT_STAGE</param-name>
<param-value>Development</param-value>
</context-param>
<context-param>
<param-name>primefaces.UPLOADER</param-name>
<param-value>auto|native|commons</param-value>
</context-param>
<filter>
<filter-name>PrimeFaces FileUpload Filter</filter-name>
<filter-class>org.primefaces.webapp.filter.FileUploadFilter</filter-class>
<init-param>
<param-name>thresholdSize</param-name>
<param-value>51200</param-value>
</init-param>
<init-param>
<param-name>uploadDirectory</param-name>
<param-value>C:\Windows\Temp</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>PrimeFaces FileUpload Filter</filter-name>
<servlet-name>Faces Servlet</servlet-name>
<dispatcher>REQUEST</dispatcher>
<dispatcher>FORWARD</dispatcher>
</filter-mapping>
<listener>
<listener-class>com.sun.faces.config.ConfigureListener</listener-class>
</listener>
</web-app>