java - 多个文件上传 - JSF

Question

我正在使用 JSF 1.2 框架。现在我正在尝试实现一个文件上传过程，其中要上传的文件数量由最终用户控制。请查找以下快照和代码片段以供引用。

XHTML 实现:-

<a4j:commandLink action="#{importWSDLBean.xsdLoopIncrementAction}" reRender="WSDLPanelGrid">
 <h:graphicImage value="/images/plus_icon.gif" />
</a4j:commandLink>

<a4j:commandLink action="#{importWSDLBean.xsdLoopDecrementAction}" reRender="WSDLPanelGrid">
 <h:graphicImage value="/images/minus_icon.gif" />
</a4j:commandLink>

<h:panelGrid id="WSDLPanelGrid">
 <c:forEach items="#{importWSDLBean.acscDataList}" var="inputFUpload">
  <t:inputFileUpload id="#{inputFUpload.id}" value="#{inputFUpload.value}" />
 </c:forEach>
</h:panelGrid>

Java Bean 实现:-

public String xsdLoopIncrementAction() {
    if (acscDataList == null) {
        acscDataList = new ACSCDataList(new ArrayList());
        HtmlInputFileUpload htmlUpload = new HtmlInputFileUpload();
        htmlUpload.setId("upload" + (acscDataList.size() + 1));
        acscDataList.add(htmlUpload);
    } else {
        HtmlInputFileUpload htmlUpload = new HtmlInputFileUpload();
        htmlUpload.setId("upload" + (acscDataList.size() + 1));
        acscDataList.add(htmlUpload);
    }
    return "success";
}


public String xsdLoopDecrementAction() {
    if (acscDataList != null) {
        if (acscDataList.size() > 0) {
            acscDataList.remove(acscDataList.size() - 1);
        }
    }
    return "success";
}

每当我增加或减少编号时，此实现都会重置文件上传值。文件上传字段。另外，当我提交表单时，我无法获取 UploadedFile 对象(还包括文件上传先决条件，例如表单类型和 Web.xml 配置)。

谁能帮帮我吗？

Answer 1

如果您动态地创建您的输入上传？具有绑定(bind)属性

<h:panelGrid binding="#{importWSDLBean.myPanelGrid}"></h:panelGrid>

在你的支持bean中添加属性

private javax.faces.component.html.HtmlPanelGrid myPanelGrid;
/**
 * @return the myPanelGrid
 */
public javax.faces.component.html.HtmlPanelGrid getMyPanelGrid() {
    return myPanelGrid;
}



/**
 * @param myPanelGrid the myPanelGrid to set
 */
public void setMyPanelGrid(javax.faces.component.html.HtmlPanelGrid myPanelGrid) {
    this.myPanelGrid = myPanelGrid;
}
/*change for your value upload type*/
Map<String,Object> values = new LinkedHashMap<String, Object>();
public void addInputAction() {



    String key = "key"+values.size();
            values.put(key,"newValue");

    HtmlInputText input = new HtmlInputText();
 /*add input property (converter,css,etc?)*/
    input.setId("id_"+key);

    input.setValueExpression("value", createValueExpression(
            "#{WSDLPanelGrid.values['"+key+"']}", new Class[0], String.class));
/*add to panel grid your input*/
    myPanelGrid.getChildren().add(input);
}

  public static ValueExpression createValueExpression(String value,
        Class[] params, Class returnType) {
    FacesContext fctx = FacesContext.getCurrentInstance();
    ELContext elctx = fctx.getELContext();
    Application jsfApp = fctx.getApplication();
    ExpressionFactory exprFactory = jsfApp.getExpressionFactory();

    ValueExpression valueExpr = exprFactory.createValueExpression(elctx,
            value, returnType);

    return valueExpr;

}