我有一个表单，其中包含两个用于保存附件的富文本字段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 类中的方法，该方法创建一个包含相关字段中的文件的 zip 文件。 zip 文件会在用户的浏览器中下载。
一切都很完美 - 除了以下事实：如果您下载其中一个 zip 文件，则无法立即下载另一个。在第二次单击按钮执行任何操作之前，会有大约 15-20 秒的延迟。
X页面：-
<?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();
}
}
}
是否有什么因素阻止在 15-20 秒内单击第二个按钮？非常感谢您的任何建议
尝试将
XSP.allowSubmit()<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:this.script><![CDATA[XSP.allowSubmit()]]></xp:this.script>
</xp:eventHandler>
</xp:button>