java poi 合并 word文档

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;

import org.apache.poi.openxml4j.opc.OPCPackage;
import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.apache.xmlbeans.XmlOptions;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.CTBody;

public class MergeDoc {
public static void main (String[] args) throws Exception {
InputStream in1 = null;
InputStream in2 = null;
OPCPackage src1Package = null;
OPCPackage src2Package = null;

OutputStream dest = new FileOutputStream("d:\dest.docx");
try {
in1 = new FileInputStream("d:\tmp.docx");
in2 = new FileInputStream("d:\tmp2.docx");
src1Package = OPCPackage.open(in1);
src2Package = OPCPackage.open(in2);
} catch (Exception e) {
e.printStackTrace();
}

XWPFDocument src1Document = new XWPFDocument(src1Package);
CTBody src1Body = src1Document.getDocument().getBody();
XWPFDocument src2Document = new XWPFDocument(src2Package);
CTBody src2Body = src2Document.getDocument().getBody();
appendBody(src1Body, src2Body);
src1Document.write(dest);

}

private static void appendBody(CTBody src, CTBody append) throws Exception {
XmlOptions optionsOuter = new XmlOptions();
optionsOuter.setSaveOuter();
String appendString = append.xmlText(optionsOuter);
String srcString = src.xmlText();
String prefix = srcString.substring(0,srcString.indexOf(">")+1);
String mainPart = srcString.substring(srcString.indexOf(">")+1,srcString.lastIndexOf("<"));
String sufix = srcString.substring( srcString.lastIndexOf("<") );
String addPart = appendString.substring(appendString.indexOf(">") + 1, appendString.lastIndexOf("<"));
CTBody makeBody = CTBody.Factory.parse(prefix+mainPart+addPart+sufix);
src.set(makeBody);
}

}