标签：file-upload jpa jsf java java-ee
我目前正在使用Tomahawk MyFaces将文件上传到我的服务器中.我一步一步地遵循了一些说明,一切似乎都很好,但是我没有将文件持久保存到数据库中.我没有看到任何错误,只是在我的Eclipse控制台中看到了一些警告.可以看看吗？这就是我所做的：
1-下载了用于JSF 2.0的战斧并将所有.jars添加到我的WEB-INF / lib文件夹中
2-我检查了我的web.xml是否已正确配置为使用Faces Servlet.我还为战斧扩展添加了一个过滤器,它看起来像这样：
<web-app version="3.0" 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_3_0.xsd">
<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>/pages/*</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>pages/index.jsp</welcome-file>
</welcome-file-list>
<filter>
<filter-name>MyFacesExtensionsFilter</filter-name>
<filter-class>org.apache.myfaces.webapp.filter.ExtensionsFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>MyFacesExtensionsFilter</filter-name>
<servlet-name>Faces Servlet</servlet-name>
</filter-mapping>
</web-app>
3-我还检查了我的faces-config.xml是否正确：
<?xml version="1.0" encoding="UTF-8"?>
<faces-config
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-facesconfig_2_0.xsd"
version="2.0">
4-我为上传小工具创建了一个非常简单的复合页面
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:t="http://myfaces.apache.org/tomahawk">
<ui:composition template="WEB-INF/templates/BasicTemplate.xhtml">
<ui:define name="uploadForm">
<h:form>
<t:inputFileUpload value="#{uploadController.uploadedFile}" />
<h:commandButton value="submit" action="#{uploadController.submit}" />
<h:messages />
</h:form>
</ui:define>
</ui:composition>
</html>
5-我有一个托管bean与页面通讯并获取输入的文件：
@ManagedBean
@RequestScoped
public class UploadController {
@EJB
private IFileUploaderEJB fileUploaderEJB;
private UploadedFile uploadedFile;
public void submit() throws IOException {
String fileName = FilenameUtils.getName(uploadedFile.getName());
String contentType = uploadedFile.getContentType();
byte[] bytes = uploadedFile.getBytes();
// Now you can save bytes in DB (and also content type?)
Garbage garbage = new Garbage();
garbage.setFilename(fileName);
garbage.setFile(bytes);
garbage.setDescription("info about the file");
garbage.setFileType("File extension");
fileUploaderEJB.uploadGarbage(garbage);
FacesContext.getCurrentInstance().addMessage(
null,
new FacesMessage(String.format(
"File '%s' of type '%s' successfully uploaded!",
fileName, contentType)));
}
public UploadedFile getUploadedFile() {
return uploadedFile;
}
public void setUploadedFile(UploadedFile uploadedFile) {
this.uploadedFile = uploadedFile;
}}
注意：托管bean调用了一个EJB,该EJB应该持久保存到文件
6-允许访问数据库的EJB：
@Stateless(name = "ejbs/FileUploaderEJB")
public class FileUploaderEJB implements IFileUploaderEJB {
@PersistenceContext
private EntityManager em;
public Garbage uploadGarbage(Garbage garbage) {
Date date = new Date();
DateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");
garbage.setUploadDate(dateFormat.format(date));
//...
em.persist(garbage);
return garbage;
}
7-最后,我有一个使用JPA批注的Entity,它使用@Lob将文件存储在数据库中：
@Entity
public class Garbage {
@Id
@GeneratedValue
@Column(nullable = false)
private Long id;
@Column(nullable = false)
private String filename;
@Column(nullable = false)
private String fileType;
@Column(nullable = false)
private String uploadDate;
@Column(nullable = false)
private String destroyDate;
@Lob
@Column(nullable = false)
private byte[] file;
@Column(nullable = false)
private String description;
//Getters and Setters...
问题是3：
P1-当我使用浏览按钮选择一个文件,然后单击“提交”时,没有任何反应.我在控制台中看不到任何输入查询,没有新行添加到数据库.我想念什么？
P2-每当我对源代码进行更改并再次发布控制台时,其构建时间将比平时更长(将近40秒),并且它向我显示许多类似这样的警告(或多或少20条)：
WARNING: JSF1029: Application is versioned at 2.0 (either explicitly by the version of /WEB-INF/faces-config.xml or the lack of a /WEB-INF/faces-confg.xml), however class ‘org.ajax4jsf.taglib.html.facelets.AjaxSupportHandler’ depends on a legacy facelet class. The facelet artifact represented by this class will not be registered.
jar文件或faces-config.xml中的配置是否有问题？
P3-当我使用浏览器导航到项目中的任何页面时,将出现如下警告：
WARNING: PWC4011: Unable to set request character encoding to UTF-8 from context /Datapool, because request parameters have already been read, or ServletRequest.getReader() has already been called
我认为这与web.xml中的过滤器有关
解决方法:
When i select a file with the browse button and then i click submit nothing happens.
您的< h：form>缺少enctype =“ multipart / form-data”属性.在这里查看迷你教程：JSF 2.0 file upload with Tomahawk’s <t:inputFileUpload>.
WARNING: JSF1029: Application is versioned at 2.0 (either explicitly by the version of /WEB-INF/faces-config.xml or the lack of a /WEB-INF/faces-confg.xml), however class ‘org.ajax4jsf.taglib.html.facelets.AjaxSupportHandler’ depends on a legacy facelet class. The facelet artifact represented by this class will not be registered.
您的Web项目中仍然有一些针对JSF 1.2的RichFaces / A4J库.如果不需要,请摆脱它们.
WARNING: PWC4011: Unable to set request character encoding to UTF-8 from context /Datapool, because request parameters have already been read, or ServletRequest.getReader() has already been called
这是特定于Glassfish的. Glassfish的默认值为ISO-8859-1,需要重新配置为使用UTF-8.另请参见How to get rid of WARNING: PWC4011: Unable to set request character encoding to UTF-8
标签：file-upload,jpa,jsf,java,java-ee 来源： https://codeday.me/bug/20191102/1994101.html
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