java合并PDF,itext.jar

import java.io.FileOutputStream;  
import java.io.IOException;  
import com.lowagie.text.Document;  
import com.lowagie.text.DocumentException;  
import com.lowagie.text.pdf.PdfCopy;  
import com.lowagie.text.pdf.PdfImportedPage;  
import com.lowagie.text.pdf.PdfReader;  
  
public class MergeFile {  
    public static void main(String[] args) {  
        String[] files = { "e:\\1.pdf", "e:\\2.pdf", "e:\\3.pdf" };  
        String savepath = "e:\\temp.pdf";  
        mergePdfFiles(files, savepath);  
    } /* 
         * * 合並pdf文件 * * @param files 要合並文件數組(絕對路徑如{ "e:\\1.pdf", "e:\\2.pdf" , 
         * "e:\\3.pdf"}) * @param newfile 
         * 合並後新產生的文件絕對路徑如e:\\temp.pdf,請自己刪除用過後不再用的文件請 * @return boolean 
         * 產生成功返回true, 否則返回false 
         */  
  
    public static boolean mergePdfFiles(String[] files, String newfile) {  
        boolean retValue = false;  
        Document document = null;  
        try {  
            document = new Document(new PdfReader(files[0]).getPageSize(1));  
            PdfCopy copy = new PdfCopy(document, new FileOutputStream(newfile));  
            document.open();  
            for (int i = 0; i < files.length; i++) {  
                PdfReader reader = new PdfReader(files[i]);  
                int n = reader.getNumberOfPages();  
                for (int j = 1; j <= n; j++) {  
                    document.newPage();  
                    PdfImportedPage page = copy.getImportedPage(reader, j);  
                    copy.addPage(page);  
                }  
            }  
            retValue = true;  
        } catch (Exception e) {  
            e.printStackTrace();  
        } finally {  
            document.close();  
        }  
        return retValue;  
    }  
}