Java XPages在第二次点击按钮之前延迟

我有一个具有两个用于保存附件的富文本字段的表单和一个包含两个文件下载控件(每个字段一个)和两个按钮的XPage.

这些按钮调用Java类中的一个方法，该方法创建一个包含相关字段中的文件的压缩文件.在浏览器中为用户下载该压缩文件.

这一切都是完美的--除了如果你下载了任何一个压缩文件，你不能立即下载另一个.在第二次点击按钮做任何事情之前，大约有15-20秒的延迟.

XPage:-

<?xml version="1.0" encoding="UTF-8"?>
<xp:view xmlns:xp="http://www.ibm.com/xsp/core">
    <xp:this.data>
        <xp:dominoDocument var="document1" formName="Document"></xp:dominoDocument>
    </xp:this.data>
    
    <xp:panel tagName="div"
        style="margin-left:auto; margin-right:auto; width:50%">

        <xp:br></xp:br>

        <xp:fileDownload rows="30" id="fileDownload1"
            displayLastModified="false" value="#{document1.Body1}">
        </xp:fileDownload>
        
        <xp:button value="Download Zipfile 1" id="button1">
            <xp:eventHandler event="onclick" submit="true" refreshMode="complete">
                <xp:this.script><![CDATA[console.log("Button1 click")]]></xp:this.script>
                <xp:this.action><![CDATA[#{javascript:uk.co.mp.DownloadAllAttachments.downloadFromField(context.getUrlParameter("documentId"), "Body1");
}]]></xp:this.action>
            </xp:eventHandler>
        </xp:button>

        <xp:br></xp:br>

        <xp:fileDownload rows="30" id="fileDownload2"
            displayLastModified="false" value="#{document1.Body2}">
        </xp:fileDownload>

        
        <xp:button value="Download Zipfile 2" id="button2">
            <xp:eventHandler event="onclick" submit="true"
                refreshMode="complete">
                <xp:this.script><![CDATA[console.log("Button2 click")]]></xp:this.script>
                <xp:this.action><![CDATA[#{javascript:uk.co.mp.DownloadAllAttachments.downloadFromField(context.getUrlParameter("documentId"), "Body2");
}]]></xp:this.action>
            </xp:eventHandler>
        </xp:button>

    </xp:panel>

</xp:view>

Java类:-

package uk.co.mp;

import java.io.BufferedInputStream;
import java.io.OutputStream;
import java.util.Iterator;
import java.util.Map;
import java.util.Vector;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
import javax.faces.component.UIViewRoot;
import javax.faces.context.FacesContext;
import javax.servlet.http.HttpServletResponse;
import lotus.domino.Document;
import lotus.domino.EmbeddedObject;
import lotus.domino.RichTextItem;

import com.ibm.xsp.designer.context.XSPContext;
import com.ibm.xsp.model.domino.DominoUtils;

//
import lotus.domino.Session;
import lotus.domino.Database;
import com.ibm.xsp.extlib.util.ExtLibUtil;

public class DownloadAllAttachments {
    

    @SuppressWarnings({ "unchecked", "rawtypes" })
    public static void downloadFromField(String documentUNID, String fieldName) {

        // Initialize global XPage objects
        FacesContext facesContext = FacesContext.getCurrentInstance();
        XSPContext context = XSPContext.getXSPContext(facesContext);
        UIViewRoot view = facesContext.getViewRoot();
        Map viewScope = view.getViewMap();

        try {

            if (documentUNID == null || documentUNID.trim().equals("")) {
                viewScope.put("errorString", "URL parameter \"documentUNID\" or \"u\" is required.");
                view.setRendered(true);
                return;
            }

            Session s = ExtLibUtil.getCurrentSessionAsSigner();
            Database db = s.getCurrentDatabase();
            
            // Get and validate the document from which attachments would be zipped
            Document downloadDocument = null;
            downloadDocument = db.getDocumentByUNID(documentUNID);

            // Get and validate zip file name from URL
            String zipFileName = fieldName + ".zip";

            boolean bAnyAttachments = false;
            EmbeddedObject embeddedObj = null;
            Vector attachments = null;
            
            // ...check for attachments in the field supplied and collect the names of the attachments
            RichTextItem rtitem = (RichTextItem)downloadDocument.getFirstItem(fieldName);
            Vector vec = rtitem.getEmbeddedObjects();
            attachments = new Vector(vec.size());
            
            if (!vec.isEmpty()) {
                Iterator it = vec.iterator();

                while(it.hasNext()){
                    embeddedObj = (EmbeddedObject)it.next();
                    if (embeddedObj != null) {
                        attachments.add(embeddedObj.getName());
                        bAnyAttachments = true;
                    }

                }
            }

            
            //By this point we should have a list of the attachment names we want to include in the zip file            

            //If we have not found any attachments then return a message
            if (!bAnyAttachments) {
                viewScope.put("errorString", "<center><h3>No attachments found in the Document.</h3></center>");
                return;
            }

            // Set response header values
            HttpServletResponse response = (HttpServletResponse) facesContext.getExternalContext().getResponse();
            response.setHeader("Cache-Control", "no-cache");
            response.setDateHeader("Expires", -1);
            response.setContentType("application/zip");
            response.setHeader("Content-Disposition", "attachment; filename=" + zipFileName);

            // Get stream related objects
            OutputStream outStream = response.getOutputStream();
            ZipOutputStream zipOutStream = new ZipOutputStream(outStream);
            BufferedInputStream bufferInStream = null;

            // Get all attachment names and loop through all of them adding to zip
            for (int i = 0; i < attachments.size(); i++) {
                embeddedObj = downloadDocument.getAttachment(attachments.get(i).toString());
                if (embeddedObj != null) {
                    bufferInStream = new BufferedInputStream(embeddedObj.getInputStream());
                    int bufferLength = bufferInStream.available();
                    byte data[] = new byte[bufferLength];
                    bufferInStream.read(data, 0, bufferLength); // Read the attachment data
                    ZipEntry entry = new ZipEntry(embeddedObj.getName());
                    zipOutStream.putNextEntry(entry);
                    zipOutStream.write(data); // Write attachment into Zip file
                    bufferInStream.close();
                    embeddedObj.recycle();
                }
            }


            // Clean up and close objects
            downloadDocument.recycle();
            zipOutStream.flush();
            zipOutStream.close();
            outStream.flush();
            outStream.close();
            facesContext.responseComplete();

        } catch (Exception e) {
            viewScope.put("errorString", "Error while zipping attachments.<br>" + e.toString());
            e.printStackTrace();
        }
    }
    
    
}

在那15-20秒内，有没有什么东西可以阻止第二次点击按钮？非常感谢您的建议