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[英]How to replace DataXML from Slide Diagram in Powerpoint using Apache POI
[英]Removing chart from PowerPoint slide with Apache POI
我們正在嘗試使用Apache POI 3.16從PowerPoint幻燈片中刪除圖表,但遇到了困難。
我們的代碼執行以下步驟:
這很好。
在某些時候,我們需要從給定的幻燈片中刪除圖表。 這是我們的嘗試:
OPCPackage pkg = ppt.getPackage();
String chartRelationId = slide.getRelationId(chart);
pkg.removeRelationship(chartRelationId);
pkg.removePart(chart.getPackagePart());
pkg.removePart()
調用似乎可以正常工作,但是將最終的PowerPoint文檔寫入磁盤失敗,但有一個例外,說明無法刪除零件文件(大概是因為我們已經刪除了零件文件)。
在將文檔寫入磁盤時, pkg.removeRelationship()
調用還會觸發一個異常,該異常表明core.xml
已經存在。
可以使用Apache POI從PowerPoint幻燈片中刪除圖表嗎? 如果是這樣,怎么辦?
由於XSLFChart
處於@Beta狀態,因此到目前為止,圖表沒有明確的Shape
。 因此,使用apache poi
我們只能獲取包含圖表的XSLFGraphicFrame
。 但是從幻燈片中刪除XSLFGraphicFrame
不會同時刪除所有相關的圖表部分。 因此,自上而下刪除相關圖表零件意味着從POIXMLDocumentPart
級別下降到PackagePart
級別,直到現在才實現。 而且,由於POIXMLDocumentPart
中的所有相關方法都受到保護並且XSLFChart
本身是最終的,因此實際上沒有解決的可能性。
以下代碼顯示了該問題。 如此評論。
該代碼將刪除第一張幻燈片的所有圖表,並刪除所有的關系和相關零部件,這將是: /ppt/embeddings/Microsoft_Excel_WorksheetN.xlsx
, /ppt/charts/colorsN.xml
和/ppt/charts/styleN.xml
。 正如注釋所示,僅/ppt/charts/chartN.xml
無法刪除。
import java.io.FileInputStream;
import java.io.FileOutputStream;
import org.apache.poi.xslf.usermodel.*;
import org.apache.poi.sl.usermodel.*;
import org.apache.poi.POIXMLDocumentPart;
import org.apache.poi.openxml4j.opc.OPCPackage;
import org.apache.poi.openxml4j.opc.PackagePart;
import org.apache.poi.openxml4j.opc.PackageRelationshipCollection;
import org.apache.poi.openxml4j.opc.PackageRelationship;
import org.apache.xmlbeans.XmlObject;
import java.util.Map;
import java.util.HashMap;
import java.util.regex.Pattern;
public class ReadPPTRemoveChart {
public static void main(String[] args) throws Exception {
XMLSlideShow slideShow = new XMLSlideShow(new FileInputStream("PPTWithCharts.pptx"));
XSLFSlide slide = slideShow.getSlides().get(0);
Map<String, XSLFGraphicFrame> chartFramesToRemove = new HashMap<>();
for (XSLFShape shape : slide.getShapes()) {
if (shape instanceof XSLFGraphicFrame) {
XSLFGraphicFrame graphicframe = (XSLFGraphicFrame)shape;
XmlObject xmlobject = graphicframe.getXmlObject();
XmlObject[] graphics = xmlobject.selectPath(
"declare namespace a='http://schemas.openxmlformats.org/drawingml/2006/main' " +
".//a:graphic");
if (graphics.length > 0) { //we have a XSLFGraphicFrame containing a:graphic
XmlObject graphic = graphics[0];
XmlObject[] charts = graphic.selectPath(
"declare namespace c='http://schemas.openxmlformats.org/drawingml/2006/chart' " +
".//c:chart");
if (charts.length > 0) { //we have a XSLFGraphicFrame containing c:chart
XmlObject chart = charts[0];
String rid = chart.selectAttribute(
"http://schemas.openxmlformats.org/officeDocument/2006/relationships", "id")
.newCursor().getTextValue();
chartFramesToRemove.put(rid, graphicframe);
}
}
}
}
PackagePart slidepart = slide.getPackagePart();
OPCPackage opcpackage = slideShow.getPackage();
for (String rid : chartFramesToRemove.keySet()) {
//at frist remove the XSLFGraphicFrame
XSLFGraphicFrame chartFrame = chartFramesToRemove.get(rid);
slide.removeShape(chartFrame);
//Here is the problem in my opinion. This **should** remove all related parts too.
//But since XSLFChart is @Beta, it does not.
//So we try doing removing the related parts manually.
//we get the PackagePart of the chart
PackageRelationship relship = slidepart.getRelationships().getRelationshipByID(rid);
PackagePart chartpart = slidepart.getRelatedPart(relship);
//now we get and remove all the relations and related PackageParts from this chartpart
//this are /ppt/embeddings/Microsoft_Excel_WorksheetN.xlsx, /ppt/charts/colorsN.xml
//and /ppt/charts/styleN.xml
for (PackageRelationship chartrelship : chartpart.getRelationships()) {
String partname = chartrelship.getTargetURI().toString();
PackagePart part = opcpackage.getPartsByName(Pattern.compile(partname)).get(0);
opcpackage.removePart(part);
chartpart.removeRelationship(chartrelship.getId());
}
//this works
//now we **should** be able removing the relationship to the chartpart from the slide too
//but this seems not to be possible
//doing this on PackagePart level works:
slidepart.removeRelationship(rid);
for (PackageRelationship sliderelship : slidepart.getRelationships()) {
System.out.println("rel PP level: " + sliderelship.getTargetURI().toString());
}
//all relationships to /ppt/charts/chartN.xml are removed
//but on POIXMLDocumentPart level this has no effect
for (POIXMLDocumentPart sliderelpart : slide.getRelations()) {
System.out.println("rel POIXML level: " + sliderelpart.getPackagePart().getPartName());
}
//relationships to /ppt/charts/chartN.xml are **not** removed
//So we cannot remove the chartpart.
//If we would do this, then while slideShow.write the
//org.apache.poi.xslf.usermodel.XSLFChart.commit in XSLFChart.java fails
//because after removing the PackagePart is absent but the relation is still there.
//opcpackage.removePart(chartpart);
}
slideShow.write(new FileOutputStream("PPTWithChartsNew.pptx"));
slideShow.close();
}
}
使用PowerPoint
打開PPTWithChartsNew.pptx
並將其保存后,由於不需要更多的/ppt/charts/styleN.xml
部分,因此也將它們刪除。
編輯2017年9月24日:
找到了使用反射的解決方案。 如前所述,刪除相關的圖表部分需要自上而下,即從POIXMLDocumentPart
級別降至PackagePart
級別。 並且由於POIXMLDocumentPart.removeRelation
受保護,因此我們需要使用反射進行此操作。
import java.io.FileInputStream;
import java.io.FileOutputStream;
import org.apache.poi.xslf.usermodel.*;
import org.apache.poi.sl.usermodel.*;
import org.apache.poi.POIXMLDocumentPart;
import org.apache.poi.openxml4j.opc.OPCPackage;
import org.apache.poi.openxml4j.opc.PackagePart;
import org.apache.poi.openxml4j.opc.PackageRelationshipCollection;
import org.apache.poi.openxml4j.opc.PackageRelationship;
import org.apache.xmlbeans.XmlObject;
import java.util.Map;
import java.util.HashMap;
import java.util.regex.Pattern;
import java.lang.reflect.Method;
public class ReadPPTRemoveChart {
public static void main(String[] args) throws Exception {
XMLSlideShow slideShow = new XMLSlideShow(new FileInputStream("PPTWithCharts.pptx"));
XSLFSlide slide = slideShow.getSlides().get(0);
Map<String, XSLFGraphicFrame> chartFramesToRemove = new HashMap<>();
for (XSLFShape shape : slide.getShapes()) {
if (shape instanceof XSLFGraphicFrame) {
XSLFGraphicFrame graphicframe = (XSLFGraphicFrame)shape;
XmlObject xmlobject = graphicframe.getXmlObject();
XmlObject[] graphics = xmlobject.selectPath(
"declare namespace a='http://schemas.openxmlformats.org/drawingml/2006/main' " +
".//a:graphic");
if (graphics.length > 0) { //we have a XSLFGraphicFrame containing a:graphic
XmlObject graphic = graphics[0];
XmlObject[] charts = graphic.selectPath(
"declare namespace c='http://schemas.openxmlformats.org/drawingml/2006/chart' " +
".//c:chart");
if (charts.length > 0) { //we have a XSLFGraphicFrame containing c:chart
XmlObject chart = charts[0];
String rid = chart.selectAttribute(
"http://schemas.openxmlformats.org/officeDocument/2006/relationships", "id")
.newCursor().getTextValue();
chartFramesToRemove.put(rid, graphicframe);
}
}
}
}
PackagePart slidepart = slide.getPackagePart();
OPCPackage opcpackage = slideShow.getPackage();
for (String rid : chartFramesToRemove.keySet()) {
//at frist remove the XSLFGraphicFrame
XSLFGraphicFrame chartFrame = chartFramesToRemove.get(rid);
slide.removeShape(chartFrame);
//Here is the problem in my opinion. This **should** remove all related parts too.
//But since XSLFChart is @Beta, it does not.
//So we try doing removing the related parts manually.
//we get the PackagePart of the chart
PackageRelationship relship = slidepart.getRelationships().getRelationshipByID(rid);
PackagePart chartpart = slidepart.getRelatedPart(relship);
//now we get and remove all the relations and related PackageParts from this chartpart
//this are /ppt/embeddings/Microsoft_Excel_WorksheetN.xlsx, /ppt/charts/colorsN.xml
//and /ppt/charts/styleN.xml
for (PackageRelationship chartrelship : chartpart.getRelationships()) {
String partname = chartrelship.getTargetURI().toString();
PackagePart part = opcpackage.getPartsByName(Pattern.compile(partname)).get(0);
opcpackage.removePart(part);
chartpart.removeRelationship(chartrelship.getId());
}
//now we remove the chart part from the slide part
//We need doing this on POIXMLDocumentPart level.
//Since POIXMLDocumentPart.removeRelation is protected, we need doing this using reflection
XSLFChart chart = (XSLFChart)slide.getRelationById(rid);
Method removeRelation = POIXMLDocumentPart.class.getDeclaredMethod("removeRelation", POIXMLDocumentPart.class);
removeRelation.setAccessible(true);
removeRelation.invoke(slide, chart);
}
slideShow.write(new FileOutputStream("PPTWithChartsNew.pptx"));
slideShow.close();
}
}
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