【发布时间】：2012-02-12 20:20:06
【问题描述】：
我还在学习JSF的路上。我有一个带有 IceFaces commandLink 的 IceFaces 树来尝试下载文件。到目前为止，这是我的 xhtml 和我的支持 bean。当我单击 commandLink 时，它只打印两条消息，然后它什么也不做，并且根本不显示任何警告任何错误......如何知道发生了什么？我错过了什么？
干杯
XHTML
<?xml version='1.0' encoding='UTF-8' ?>
<!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:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:ice="http://www.icesoft.com/icefaces/component">
<h:head>
<title>Facelet Title</title>
</h:head>
<h:body>
<h:form>
<ice:tree id="tree"
value="#{treeBean.model}"
var="item"
hideNavigation="false"
hideRootNode="false"
imageDir="./images/">
<ice:treeNode>
<f:facet name="icon">
<ice:panelGroup style="display: inline">
<h:graphicImage value="#{item.userObject.icon}"/>
</ice:panelGroup>
</f:facet>
<f:facet name="content">
<ice:panelGroup style="display: inline">
<ice:commandLink action="#{treeBean.doDownload(item.userObject.fileAbsolutePath)}">
<ice:outputText value="#{item.userObject.text}"/>
</ice:commandLink>
</ice:panelGroup>
</f:facet>
</ice:treeNode>
</ice:tree>
</h:form>
</h:body>
</html>
豆
@ManagedBean
@ViewScoped
public class TreeBean implements Serializable {
private final DefaultTreeModel model;
/** Creates a new instance of TreeBean */
public TreeBean() {
// create root node with its children expanded
DefaultMutableTreeNode rootTreeNode = new DefaultMutableTreeNode();
IceUserObject rootObject = new IceUserObject(rootTreeNode);
rootObject.setText("Root Node");
rootObject.setExpanded(true);
rootObject.setBranchContractedIcon("./images/tree_folder_close.gif");
rootObject.setBranchExpandedIcon("./images/tree_folder_open.gif");
rootObject.setLeafIcon("./images/tree_document.gif");
rootTreeNode.setUserObject(rootObject);
// model is accessed by by the ice:tree component via a getter method
model = new DefaultTreeModel(rootTreeNode);
// add some child nodes
for (int i = 0; i < 3; i++) {
DefaultMutableTreeNode branchNode = new DefaultMutableTreeNode();
FileSourceUserObject branchObject = new FileSourceUserObject(branchNode);
branchObject.setText("SteveJobs.jpg");
branchObject.setFileAbsolutePath("/Users/BRabbit/Downloads/SteveJobs.jpg");
branchObject.setBranchContractedIcon("./images/tree_folder_close.gif");
branchObject.setBranchExpandedIcon("./images/tree_folder_open.gif");
branchObject.setLeafIcon("./images/tree_document.gif");
branchObject.setLeaf(true);
branchNode.setUserObject(branchObject);
rootTreeNode.add(branchNode);
}
}
public DefaultTreeModel getModel() {
return model;
}
public void doDownload(String fileAbsolutePath) {
System.out.println(fileAbsolutePath);
File file = new File(fileAbsolutePath);
if(file.exists())
System.out.println("Yes"); //It exists !
FacesContext facesContext = FacesContext.getCurrentInstance();
ExternalContext externalContext = facesContext.getExternalContext();
externalContext.setResponseHeader("Content-Type", externalContext.getMimeType(file.getName()));
externalContext.setResponseHeader("Content-Length", String.valueOf(file.length()));
externalContext.setResponseHeader("Content-Disposition", "attachment;filename=\"" + file.getName() + "\"");
InputStream input = null;
OutputStream output = null;
try {
input = new FileInputStream(file);
output = externalContext.getResponseOutputStream();
IOUtils.copy(input, output);
} catch (FileNotFoundException ex) {
Logger.getLogger(TreeBean.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(TreeBean.class.getName()).log(Level.SEVERE, null, ex);
} finally {
IOUtils.closeQuietly(output);
IOUtils.closeQuietly(input);
}
facesContext.responseComplete();
}
}
Bean 的对象
public class FileSourceUserObject extends IceUserObject{
String fileAbsolutePath;
public FileSourceUserObject(DefaultMutableTreeNode wrapper) {
super(wrapper);
}
public String getFileAbsolutePath(){
return fileAbsolutePath;
}
public void setFileAbsolutePath(String fileAbsolutePath){
this.fileAbsolutePath = fileAbsolutePath;
}
}
【问题讨论】：