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尝试创建我自己的图像上传程序（JSF）

jsf file-upload jsf-2

尝试创建我自己的图像上传程序（JSF）,jsf,file-upload,jsf-2,facelets,tagfile,Jsf,File Upload,Jsf 2,Facelets,Tagfile,我想将图像从客户端上传到服务器。我已经用primefaces这样的小玩意儿做到了。但是这一次，我想试着自己去做。我在网上找到了关于如何做的信息，但我有点被卡住了。 我目前的问题是，浏览器告诉我，我为上传创建的标签没有绑定。我想了解，为什么应用程序找不到它，我应该如何修复它 我将粘贴到现在为止我所做的一切，以便您可以帮助我找到错误： 1.将commons-fileupload-1.2.1.jar和commons-io-1.4.jar添加到lib文件夹（自动添加到类路径） 2.创建了一个xml，该

我想将图像从客户端上传到服务器。我已经用primefaces这样的小玩意儿做到了。但是这一次，我想试着自己去做。我在网上找到了关于如何做的信息，但我有点被卡住了。 我目前的问题是，浏览器告诉我，我为上传创建的标签没有绑定。我想了解，为什么应用程序找不到它，我应该如何修复它

我将粘贴到现在为止我所做的一切，以便您可以帮助我找到错误：

1.将commons-fileupload-1.2.1.jar和commons-io-1.4.jar添加到lib文件夹（自动添加到类路径）

2.创建了一个xml，该xml将使标记库可用（它位于WEB-INF文件夹中）

我看到的错误是导航到添加新标记的页面时出现以下错误：

javax.faces.view.facelets.FaceletException: Error Parsing /oglas.xhtml: Error Traced[line: 183] The prefix "corejsf" for element "corejsf:upload" is not bound.
    at com.sun.faces.facelets.compiler.SAXCompiler.doCompile(SAXCompiler.java:387)
    at com.sun.faces.facelets.compiler.SAXCompiler.doMetadataCompile(SAXCompiler.java:370)
    at com.sun.faces.facelets.compiler.Compiler.metadataCompile(Compiler.java:123)
    at com.sun.faces.facelets.impl.DefaultFaceletFactory.createMetadataFacelet(DefaultFaceletFactory.java:353)
    at com.sun.faces.facelets.impl.DefaultFaceletFactory.getMetadataFacelet(DefaultFaceletFactory.java:231)
    at com.sun.faces.facelets.impl.DefaultFaceletFactory.getMetadataFacelet(DefaultFaceletFactory.java:164)
    at com.sun.faces.application.view.ViewMetadataImpl.createMetadataView(ViewMetadataImpl.java:102)
    at com.sun.faces.lifecycle.RestoreViewPhase.execute(RestoreViewPhase.java:239)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:110)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:312)
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1523)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:188)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:641)
    at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:97)
    at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:85)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:185)
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:325)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:226)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:165)
    at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791)
    at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:693)
    at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:954)
    at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:170)
    at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:135)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:102)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:88)
    at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:76)
    at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:53)
    at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:57)
    at com.sun.grizzly.ContextTask.run(ContextTask.java:69)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:330)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:309)
    at java.lang.Thread.run(Thread.java:662)
-我错过了什么

-我还需要做什么才能将文件从客户端传输到上传文件夹内具有唯一文件名的服务器文件系统

我的最终目标不是将这些图像添加到数据库中，而是将它们留在文件系统中

我希望有人能帮助我

更新

我将xmlns添加到我的页面，并修复了异常：

xmlns:corejsf=”http://corejsf.com"

但是为什么当我点击按钮时，文件没有上传？

如果您还没有上传，您需要向页面添加XML名称空间，就像您对Facelets、PrimeFaces等所做的那样。这应该可以解决“前缀未绑定”错误

如果您还没有，您需要将XML名称空间添加到页面，就像您对Facelet、PrimeFaces等所做的那样。这应该可以解决“前缀未绑定”错误
是的，我忘了。这修正了例外情况。谢谢单击“提交”后，我仍然看不到上载文件夹中的文件。为什么？我不能马上看到。如果您还没有调试程序，我建议您单步执行。好的，我会试试。我已经检查过了，我的表单使用：
唯一让我困惑的是
操作=“/submittedImage”
是否实际允许提交表单。我怎么能检查呢？你需要确保在提交表单时端点（我猜在这种情况下是过滤器？）确实被命中。我对JSF有点陌生，我正在尝试调试，但我真的不知道如何使用eclipse调试器，有了JSF，你能帮我找到文件无法上传的原因吗？如何检查是否调用了筛选器？我在filter类中放置了断点，但是eclipse没有改变到debug透视图，我想我没有像你说的那样点击filter。是的，我忘记了。这修正了例外情况。谢谢单击“提交”后，我仍然看不到上载文件夹中的文件。为什么？我不能马上看到。如果您还没有调试程序，我建议您单步执行。好的，我会试试。我已经检查过了，我的表单使用：
唯一让我困惑的是
操作=“/submittedImage”
是否实际允许提交表单。我怎么能检查呢？你需要确保在提交表单时端点（我猜在这种情况下是过滤器？）确实被命中。我对JSF有点陌生，我正在尝试调试，但我真的不知道如何使用eclipse调试器，有了JSF，你能帮我找到文件无法上传的原因吗？如何检查是否调用了筛选器？我在filter类中放置了断点，但是eclipse并没有改变到debug透视图，我想我并没有像您所说的那样命中filter。 
package com.corejsf;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import javax.el.ValueExpression;
import javax.faces.FacesException;
import javax.faces.component.EditableValueHolder;
import javax.faces.component.UIComponent;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import javax.faces.render.FacesRenderer;
import javax.faces.render.Renderer;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.fileupload.FileItem;

@FacesRenderer(componentFamily="javax.faces.Input",
   rendererType="com.corejsf.Upload")
public class UploadRenderer extends Renderer {
   public void encodeBegin(FacesContext context, UIComponent component)  
      throws IOException {
      if (!component.isRendered()) return;
      ResponseWriter writer = context.getResponseWriter();

      String clientId = component.getClientId(context);

      writer.startElement("input", component);
      writer.writeAttribute("type", "file", "type");
      writer.writeAttribute("name", clientId, "clientId");
      writer.endElement("input");
      writer.flush();
   }

   public void decode(FacesContext context, UIComponent component) {
      ExternalContext external = context.getExternalContext(); 
      HttpServletRequest request = (HttpServletRequest) external.getRequest();
      String clientId = component.getClientId(context);
      FileItem item = (FileItem) request.getAttribute(clientId);

      Object newValue;
      ValueExpression valueExpr = component.getValueExpression("value");
      if (valueExpr != null) {
         Class<?> valueType = valueExpr.getType(context.getELContext());
         if (valueType == byte[].class) {
            newValue = item.get();
         }
         else if (valueType == InputStream.class) {
            try {
               newValue = item.getInputStream();
            } catch (IOException ex) {
               throw new FacesException(ex);
            }
         }
         else {
            String encoding = request.getCharacterEncoding();
            if (encoding != null)
               try {
                  newValue = item.getString(encoding);
               } catch (UnsupportedEncodingException ex) {
                  newValue = item.getString(); 
               }
            else 
               newValue = item.getString(); 
         }
         ((EditableValueHolder) component).setSubmittedValue(newValue);  
         ((EditableValueHolder) component).setValid(true);  
      }

      Object target = component.getAttributes().get("target");

      if (target != null) {
         File file;
         if (target instanceof File)
            file = (File) target;
         else {
            ServletContext servletContext 
               = (ServletContext) external.getContext();
            String realPath = servletContext.getRealPath(target.toString());
            file = new File(realPath); 
         }

         try { // ugh--write is declared with "throws Exception"
            item.write(file);
         } catch (Exception ex) { 
            throw new FacesException(ex);
         }
      }
   }   
}

package com.corejsf;

import java.io.File;
import java.io.IOException;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class UploadFilter implements Filter {
   private int sizeThreshold = -1;
   private String repositoryPath;

   public void init(FilterConfig config) throws ServletException {
      repositoryPath = config.getInitParameter(
         "com.corejsf.UploadFilter.repositoryPath");
      try {
         String paramValue = config.getInitParameter(
            "com.corejsf.UploadFilter.sizeThreshold");
         if (paramValue != null) 
            sizeThreshold = Integer.parseInt(paramValue);
      }
      catch (NumberFormatException ex) {
         ServletException servletEx = new ServletException();
         servletEx.initCause(ex);
         throw servletEx;
      }
   }

   public void destroy() {
   }

   public void doFilter(ServletRequest request, 
      ServletResponse response, FilterChain chain) 
      throws IOException, ServletException {

      if (!(request instanceof HttpServletRequest)) {
         chain.doFilter(request, response);
         return;
      }

      HttpServletRequest httpRequest = (HttpServletRequest) request;

      boolean isMultipartContent 
         = ServletFileUpload.isMultipartContent(httpRequest);
      if (!isMultipartContent) {
         chain.doFilter(request, response);
         return;
      }

      DiskFileItemFactory factory = new DiskFileItemFactory();
      if (sizeThreshold >= 0)
         factory.setSizeThreshold(sizeThreshold);
      if (repositoryPath != null) 
         factory.setRepository(new File(repositoryPath));
      ServletFileUpload upload = new ServletFileUpload(factory);

      try {
         @SuppressWarnings("unchecked") List<FileItem> items 
            = (List<FileItem>) upload.parseRequest(httpRequest);
         final Map<String, String[]> map = new HashMap<String, String[]>();
         for (FileItem item : items) {
            String str = item.getString();
            if (item.isFormField())
               map.put(item.getFieldName(), new String[] { str });
            else
               httpRequest.setAttribute(item.getFieldName(), item);
         }

         chain.doFilter(new 
            HttpServletRequestWrapper(httpRequest) {
               public Map<String, String[]> getParameterMap() {
                  return map;
               }                   
               // busywork follows ... should have been part of the wrapper
               public String[] getParameterValues(String name) {
                  Map<String, String[]> map = getParameterMap();
                  return (String[]) map.get(name);
               }
               public String getParameter(String name) {
                  String[] params = getParameterValues(name);
                  if (params == null) return null;
                  return params[0];
               }
               public Enumeration<String> getParameterNames() {
                  Map<String, String[]> map = getParameterMap();
                  return Collections.enumeration(map.keySet());
               }
            }, response);
      } catch (FileUploadException ex) {
         ServletException servletEx = new ServletException();
         servletEx.initCause(ex);
         throw servletEx;
      }      
   }   
}

<!-- NEEDED FOR FILE UPLOAD -->
<filter>
      <filter-name>Upload Filter</filter-name>
      <filter-class>com.corejsf.UploadFilter</filter-class>
      <init-param>
         <param-name>sizeThreshold</param-name>
         <param-value>1024</param-value>
      </init-param>
</filter>

   <filter-mapping>
      <filter-name>Upload Filter</filter-name>
      <url-pattern>/faces/upload/*</url-pattern>
   </filter-mapping> 

    <context-param>
      <param-name>javax.faces.PROJECT_STAGE</param-name>
      <param-value>Development</param-value>
   </context-param>
   <context-param>
      <param-name>facelets.LIBRARIES</param-name>
      <param-value>/WEB-INF/corejsf.taglib.xml</param-value>
   </context-param>   

 ....

<corejsf:upload target="upload/#{placeAddController.prepareUniqueIdentifier}" />

 ....

<h:commandButton value="Dalje" style=" font-weight: bold;  font-size:150%; action="/submittedImage" />  

@ManagedBean
@RequestScoped
public class PlaceAddControler {
…
public String prepareUniqueIdentifier() {
        return UUID.randomUUID().toString()+"png";
    }   

javax.faces.view.facelets.FaceletException: Error Parsing /oglas.xhtml: Error Traced[line: 183] The prefix "corejsf" for element "corejsf:upload" is not bound.
    at com.sun.faces.facelets.compiler.SAXCompiler.doCompile(SAXCompiler.java:387)
    at com.sun.faces.facelets.compiler.SAXCompiler.doMetadataCompile(SAXCompiler.java:370)
    at com.sun.faces.facelets.compiler.Compiler.metadataCompile(Compiler.java:123)
    at com.sun.faces.facelets.impl.DefaultFaceletFactory.createMetadataFacelet(DefaultFaceletFactory.java:353)
    at com.sun.faces.facelets.impl.DefaultFaceletFactory.getMetadataFacelet(DefaultFaceletFactory.java:231)
    at com.sun.faces.facelets.impl.DefaultFaceletFactory.getMetadataFacelet(DefaultFaceletFactory.java:164)
    at com.sun.faces.application.view.ViewMetadataImpl.createMetadataView(ViewMetadataImpl.java:102)
    at com.sun.faces.lifecycle.RestoreViewPhase.execute(RestoreViewPhase.java:239)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:110)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:312)
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1523)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:188)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:641)
    at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:97)
    at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:85)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:185)
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:325)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:226)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:165)
    at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791)
    at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:693)
    at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:954)
    at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:170)
    at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:135)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:102)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:88)
    at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:76)
    at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:53)
    at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:57)
    at com.sun.grizzly.ContextTask.run(ContextTask.java:69)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:330)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:309)
    at java.lang.Thread.run(Thread.java:662)

<html xmlns="http://www.w3.org/1999/xhtml"  
    xmlns:h="http://java.sun.com/jsf/html"  
    xmlns:corejsf="http://corejsf.com">