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我在Primefaces中遇到<p:fileUpload>问题。起初，我试图在Documentation of Fileupload的片段开始2018页 的是，如果我用的片段，上传功能不叫的第一个问题：Fileupload在Primefaces中不起作用
public void upload() {
System.out.println("This is never shown");
if(file != null) {
System.out.println("This is never shown");
}
}
HTML：
<h:form enctype="multipart/form-data">
<p:fileUpload value="#{fileUploadView.file}" mode="simple" />
<p:commandButton value="Submit" action="#{fileUploadView.upload}" ajax="false"/>
</h:form>
我尝试了许多其他片段和解决方案。高级模式，与fileUploadListener，删除在小时ENCTYPE：形式，....
如果我选择mode="simple"与ajax="true"功能FileUploadView.upload()结合起来的叫法，但文件始终是NULL。
如果我从<h:form>中删除enctype，函数FileUploadView.upload()被调用，但文件始终为NULL。
我提到上述问题，因为这不应该工作，因为我读这个论坛上的所有可能的解决方案。我还添加了所有建议的dependencies和context-params和filter，但它不起作用。
在这里，我将张贴我的pom.xml，web.xml和完整的.java代码： 的pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>at.qe</groupId>
<artifactId>ASN_Application</artifactId>
<version>1.0.0</version>
<packaging>war</packaging>
<name>ASN_Application</name>
<description>
</description>
<repositories>
<repository>
<id>prime-repo</id>
<name>Prime Repo</name>
<url>http://repository.primefaces.org</url>
</repository>
<repository>
<id>spring-releases</id>
<url>https://repo.spring.io/libs-release</url>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>spring-releases</id>
<url>https://repo.spring.io/libs-release</url>
</pluginRepository>
</pluginRepositories>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.1.RELEASE</version>
</parent>
<properties>
<start-class>at.qe.sepm.asn_app.Main</start-class>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.5</version>
</dependency>
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.2</version>
</dependency>
<dependency>
<groupId>org.primefaces.themes</groupId>
<artifactId>all-themes</artifactId>
<version>1.0.10</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.glassfish.web</groupId>
<artifactId>el-impl</artifactId>
<version>2.2</version>
</dependency>
<dependency>
<groupId>javax.enterprise</groupId>
<artifactId>cdi-api</artifactId>
<version>2.0-PFD2</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
<groupId>com.sun.faces</groupId>
<artifactId>jsf-api</artifactId>
<version>2.2.14</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>com.sun.faces</groupId>
<artifactId>jsf-impl</artifactId>
<version>2.2.13</version>
<scope>compile</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-core</artifactId>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.primefaces</groupId>
<artifactId>primefaces</artifactId>
<version>6.1</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.16</version>
</dependency>
<dependency>
<groupId>com.lowagie</groupId>
<artifactId>itext</artifactId>
<version>2.1.7</version>
</dependency>
<!-- special test dependencies -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>nl.jqno.equalsverifier</groupId>
<artifactId>equalsverifier</artifactId>
<version>2.1.6</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>6.0.6</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<!-- Enable jacoco analysis -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<forkMode>once</forkMode>
<argLine>
${coverageAgent}
</argLine>
<useSystemClassLoader>true</useSystemClassLoader>
</configuration>
</plugin>
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.7.6.201602180812</version>
<configuration>
<propertyName>coverageAgent</propertyName>
</configuration>
<executions>
<execution>
<goals>
<goal>prepare-agent</goal>
</goals>
</execution>
<execution>
<id>report</id>
<phase>prepare-package</phase>
<goals>
<goal>report</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
的web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
version="2.5">
<servlet>
<servlet-name>Faces Servlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<error-page>
<exception-type>org.springframework.security.access.AccessDeniedException</exception-type>
<location>/error/access_denied.xhtml</location>
</error-page>
<context-param>
<param-name>javax.faces.STATE_SAVING_METHOD</param-name>
<param-value>server</param-value>
</context-param>
<context-param>
<param-name>javax.faces.FACELETS_SKIP_COMMENTS</param-name>
<param-value>true</param-value>
</context-param>
<context-param>
<param-name>primefaces.FONT_AWESOME</param-name>
<param-value>true</param-value>
</context-param>
<context-param>
<param-name>primefaces.UPLOADER</param-name>
<param-value>commons</param-value>
</context-param>
<filter>
<filter-name>PrimeFaces FileUpload Filter</filter-name>
<filter-class>org.primefaces.webapp.filter.FileUploadFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>PrimeFaces FileUpload Filter</filter-name>
<servlet-name>Faces Servlet</servlet-name>
</filter-mapping>
<mime-mapping>
<extension>eot</extension>
<mime-type>application/vnd.ms-fontobject</mime-type>
</mime-mapping>
<mime-mapping>
<extension>otf</extension>
<mime-type>font/opentype</mime-type>
</mime-mapping>
<mime-mapping>
<extension>ttf</extension>
<mime-type>application/x-font-ttf</mime-type>
</mime-mapping>
<mime-mapping>
<extension>woff</extension>
<mime-type>application/x-font-woff</mime-type>
</mime-mapping>
<mime-mapping>
<extension>svg</extension>
<mime-type>image/svg+xml</mime-type>
</mime-mapping>
<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>*.xhtml</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>login.xhtml</welcome-file>
</welcome-file-list>
</web-app>
FileUploadView.java
@Component
@Scope("view")
public class FileUploadView{
@Autowired
private PictureService pictureService;
@Autowired
private UserRepository userRepository;
@Autowired
private AuditLogRepository auditLogRepository;
private Picture picture;
private UploadedFile file;
public Picture getPicture(){
return picture;
}
public void setPicture(Picture picture){
this.picture = picture;
}
public UploadedFile getFile() {
return file;
}
public void setFile(UploadedFile file) {
this.file = file;
}
@PostConstruct
public void init(){
file= new DefaultUploadedFile();
}
public void upload() {
if(file != null) {
try{
System.out.println("This is never shown");
AuditLog log = new AuditLog(getAuthenticatedUser().getUsername(),"PICTURE UPLOADED: " + getAuthenticatedUser().getUsername() + " [" + getAuthenticatedUser().getUserRole() + "] ", new Date());
auditLogRepository.save(log);
System.out.println(file.getFileName());
picture = new Picture(file.getFileName(), userRepository.findFirstByUsername(auth.getName()), new Date(), file.getFileName());
pictureService.savePicture(picture);
FacesMessage message = new FacesMessage("Succesful", file.getFileName() + " is uploaded.");
FacesContext.getCurrentInstance().addMessage(null, message);
String filename = FilenameUtils.getName(file.getFileName());
InputStream input = file.getInputstream();
OutputStream output = new FileOutputStream(new File(filename));
try {
IOUtils.copy(input, output);
} finally {
IOUtils.closeQuietly(input);
IOUtils.closeQuietly(output);
}
}catch(Exception e)
{
}
}
}
如果有人能帮我找到问题，我将不胜感激。
在此先感谢
[编辑]：我试图做一个干净的Spring项目，并尝试了所有的可能性做出<p:fileUpload>，但他们没有工作。但是我看了一下浏览器的流量，发现了一些有趣的东西： 
。我按下上载按钮后立即出现POST语句，其他GET在1-2秒后出现。
@BalusC谢谢你的回答。我几天前试图创建一个新的Spring项目，并且我在您发布的网站上遵循了您的指示，但问题并未解决。我将尝试在没有Spring的情况下创建一个新的JSF项目，并且会让您知道结果。 –
@BalusC你是什么意思与“春天看起来可疑的自定义范围”？ –
@BalusC我试图在没有Spring的情况下启动一个新的项目，但我无法使这个文件上载工作。即使在新项目中，行为也与上面提到的完全相同。 –