JSF 2.0中的文件上载自定义组件中没有调用Ajax loader
在我当前的项目中,我试图创建一个文件上传自定义组件,因为我们有一个约束,即我们不能使用任何组件库。我们的要求是创建单个文件上载,选择并上载文件后,它将显示在该组件下方的数据表中。用户将能够下载上传的文件,如果需要,还可以删除上传的文件。将有一个ajax加载程序需要在上传文件时启动。从图形上看,UI如下所示JSF 2.0中的文件上载自定义组件中没有调用Ajax loader,ajax,jsf-2,custom-component,Ajax,Jsf 2,Custom Component,在我当前的项目中,我试图创建一个文件上传自定义组件,因为我们有一个约束,即我们不能使用任何组件库。我们的要求是创建单个文件上载,选择并上载文件后,它将显示在该组件下方的数据表中。用户将能够下载上传的文件,如果需要,还可以删除上传的文件。将有一个ajax加载程序需要在上传文件时启动。从图形上看,UI如下所示 ________________________ __________ ____________ | | | Browse | | Uploa
________________________ __________ ____________
| | | Browse | | Upload |
|_______________________| |_________| |___________|
______________________________________________
| | |
| File1.pdf | * |
|_______________________________________|_____|
| | |
| File2.pdf | * |
|_______________________________________|_____|
为了创建这个组件,我从CoreJavaServerPages(3e)中获得了创建自定义组件的帮助&BalusC的博客可以从jsf页面(jsf.ajax.addOnEvent)触发ajax调用。下面是渲染器、xhtml和managedbean的完整代码。目前,我使用h:outputtext而不是h:datatable来更新页面
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:corejsf="http://corejsf.com">
<h:head>
<title>A file upload test</title>
<h:outputScript name="jsf.js" library="javax.faces" target="head"/>
<script>
jsf.ajax.addOnEvent(function(data) {
var ajaxstatus = data.status;
var ajaxloader = document.getElementById("ajaxloader");
switch (ajaxstatus) {
case "begin": // This is called right before ajax request is been sent.
ajaxloader.style.display = 'block';
break;
case "complete":
ajaxloader.style.display = 'none';
break;
case "success": // NOOP.
break;
} });
</script>
</h:head>
<h:body>
<h:form>
<h:commandButton value="hello"></h:commandButton>
</h:form>
<h:form enctype="multipart/form-data">
Upload a photo of yourself:
<corejsf:upload uploadButton="upload"/>
<h:outputText id="updateText" value="#{user.value}"></h:outputText>
<h:commandButton action="#{user.submit}" value="Initiate"></h:commandButton>
</h:form>
<img id="ajaxloader" src="ajax-loader.gif" style="display: none;" />
</h:body>
</html>
文件上传测试
addOnEvent(函数(数据){
var ajaxstatus=data.status;
var ajaxloader=document.getElementById(“ajaxloader”);
开关(AJAX状态){
case“begin”://这是在发送ajax请求之前调用的。
ajaxloader.style.display='block';
打破
案例“完成”:
ajaxloader.style.display='none';
打破
案例“成功”://NOOP。
打破
} });
上传你自己的照片:
渲染器:
package com.corejsf;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.util.Map;
import javax.el.ELContext;
import javax.el.ValueExpression;
import javax.faces.FacesException;
import javax.faces.application.ResourceDependencies;
import javax.faces.application.ResourceDependency;
import javax.faces.component.EditableValueHolder;
import javax.faces.component.UIComponent;
import javax.faces.component.UIForm;
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 ajax = "jsf.ajax.request(this, event,{render:'j_idt11:updateText'}); return false";
String clientId = component.getClientId(context);
System.out.println("parentid>>>>>>"+component.getParent().getClientId(context));
System.out.println(clientId);
System.out.println("upload button >>>>>>"+(String)component.getAttributes().get("uploadButton"));
writer.startElement("input", component);
writer.writeAttribute("type", "file", "type");
writer.writeAttribute("name", clientId+":INPUT_FILE", "clientId");
writer.endElement("input");
writer.startElement("input", component);
writer.writeAttribute("type", "submit", null);
writer.writeAttribute("name", clientId + ":FILE_UPLOAD", null);
writer.writeAttribute("value", "Upload", "value");
writer.writeAttribute("onclick", ajax, null);
writer.endElement("input");
writer.flush();
}
public void decode(FacesContext context, UIComponent component) {
Map<String,String> requestMap = context.getExternalContext ().getRequestParameterMap();
String clientId = component.getClientId(context);
System.out.println("getId>>>>>>>"+component.getId());
if(requestMap.containsKey(clientId+":FILE_UPLOAD")){
try {
Thread.sleep(4000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("true");
ExternalContext external = context.getExternalContext();
HttpServletRequest request = (HttpServletRequest) external.getRequest();
//String clientIdFile = component.getClientId(context);
FileItem item = (FileItem) request.getAttribute(clientId+":INPUT_FILE");
System.out.println("filename>>>>"+item.getName()+">>>");
System.out.println("file blank>>>>"+item.getName().equals(""));
ELContext elContext = FacesContext.getCurrentInstance().getELContext();
UserBean userBean = (UserBean) FacesContext.getCurrentInstance().getApplication()
.getELResolver().getValue(elContext, null, "user");
try {
userBean.setUploadedFile(item.getInputStream());
userBean.setValue(userBean.getUploadedFileList().size());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
else
System.out.println("false");
}
}
package com.corejsf;
导入java.io.File;
导入java.io.IOException;
导入java.io.InputStream;
导入java.io.UnsupportedEncodingException;
导入java.util.Map;
导入javax.el.ELContext;
导入javax.el.ValueExpression;
导入javax.faces.FacesException;
导入javax.faces.application.ResourceDependencies;
导入javax.faces.application.ResourceDependency;
导入javax.faces.component.EditableValueHolder;
导入javax.faces.component.UIComponent;
导入javax.faces.component.UIForm;
导入javax.faces.context.ExternalContext;
导入javax.faces.context.FacesContext;
导入javax.faces.context.ResponseWriter;
导入javax.faces.render.facesrender;
导入javax.faces.render.Renderer;
导入javax.servlet.ServletContext;
导入javax.servlet.http.HttpServletRequest;
导入org.apache.commons.fileupload.FileItem;
@facesrender(componentFamily=“javax.faces.Input”,
RenderType=“com.corejsf.Upload”)
公共类上载渲染器扩展渲染器{
public void encodeBegin(FacesContext上下文,UIComponent)
抛出IOException{
如果(!component.isRendered())返回;
ResponseWriter=context.getResponseWriter();
String ajax=“jsf.ajax.request(这个事件,{render:'j_idt11:updateText'});返回false”;
字符串clientId=component.getClientId(上下文);
System.out.println(“parentid>>>>>”+component.getParent().getClientId(上下文));
System.out.println(clientId);
System.out.println(“上传按钮>>>>>>”+(字符串)组件.getAttributes().get(“上传按钮”);
startElement(“输入”,组件);
writeAttribute(“类型”、“文件”、“类型”);
writeAttribute(“name”,clientId+”:INPUT_FILE,“clientId”);
编写器。输入(“输入”);
startElement(“输入”,组件);
writer.writeAttribute(“type”、“submit”、null);
writer.writeAttribute(“name”,clientId+”:FILE\u UPLOAD,null);
writeAttribute(“值”、“上传”、“值”);
writeAttribute(“onclick”,ajax,null);
编写器。输入(“输入”);
writer.flush();
}
公共无效解码(FacesContext上下文,UIComponent){
Map requestMap=context.getExternalContext().getRequestParameterMap();
字符串clientId=component.getClientId(上下文);
System.out.println(“getId>>>>>>”+component.getId());
if(requestMap.containsKey(clientId+“:文件上传”)){
试一试{
睡眠(4000);
}捕捉(中断异常e){
//TODO自动生成的捕捉块
e、 printStackTrace();
}
System.out.println(“真”);
ExternalContext external=context.getExternalContext();
HttpServletRequest=(HttpServletRequest)external.getRequest();
//字符串clientIdFile=component.getClientId(上下文);
FileItem=(FileItem)request.getAttribute(clientId+“:INPUT_FILE”);
System.out.println(“文件名>>>”+item.getName()+“>>>”);
System.out.println(“文件空白>>>>”+item.getName().equals(“”);
ELContext ELContext=FacesContext.getCurrentInstance().getELContext();
UserBean UserBean=(UserBean)FacesContext.getCurrentInstance().getApplication()
.getELResolver().getValue(elContext,null,“用户”);
试一试{
setUploadedFile(item.getInputStream());
setValue(userBean.getUploadedFileList().size());
}捕获(IOE异常){
//TODO自动生成的捕捉块
e、 printStackTrace();
}
}
其他的
System.out.println(“假”);
}
}
托管bean:
package com.corejsf;
import java.io.Serializable;
import javax.el.ELContext;
import javax.faces.bean.ManagedBean;
//import javax.faces.bean.SessionScoped;
import javax.faces.bean.ViewScoped;
import javax.faces.context.FacesContext;
import javax.faces.event.ActionEvent;
import javax.faces.event.AjaxBehaviorEvent;
import java.io.InputStream;
import java.util.ArrayList;
@ManagedBean(name="user")
@ViewScoped
public class UserBean implements Serializable {
private static final long serialVersionUID = 1L;
private String id;
private ArrayList<InputStream> uploadedFileList = new ArrayList<InputStream>();
public ArrayList<InputStream> getUploadedFileList() {
return uploadedFileList;
}
public void setUploadedFileList(ArrayList<InputStream> uploadedFileList) {
this.uploadedFileList = uploadedFileList;
}
private int value = 0;
public int getValue() {
return value;
}
public void setValue(int value) {
this.value = value;
}
public String getId() { return id; }
public void setId(String newValue) { id = newValue; }
public void setUploadedFile(InputStream inputStream){
uploadedFileList.add(inputStream);
}
}
package com.corejsf;
导入java.io.Serializable;
导入javax.el.ELContext;
导入javax.faces.bean.ManagedBean;
//导入javax.faces.bean.SessionScoped;
导入javax.faces.bean.ViewScoped;
导入javax.faces.context.FacesContext;
导入javax.faces.event.ActionEvent;
导入javax.faces.event.AjaxBehaviorEvent;
导入java.io.InputStream;
导入java.util.ArrayList;
@ManagedBean(name=“user”)
@视域
公共课
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;
}
}
}
<facelet-taglib version="2.0"
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">
<namespace>http://corejsf.com</namespace>
<tag>
<tag-name>upload</tag-name>
<component>
<component-type>javax.faces.Input</component-type>
<renderer-type>com.corejsf.Upload</renderer-type>
</component>
</tag>
</facelet-taglib>
<h:outputScript name="jsf.js" library="javax.faces" target="head"/>